T.R | Title | User | Personal Name | Date | Lines |
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2335.1 | | GVA05::STIFF | Paul Stiff EPSCC, DTN:821-4167 | Mon Nov 07 1994 09:15 | 5 |
| How are you going to keep the rear wheels on the ground to transmit the
400 - 600 hp ? The rear end is rather light.
Paul
|
2335.2 | what about n20 | RDGENG::CLAYTON | | Mon Nov 07 1994 14:04 | 10 |
| what about using nitrous oxide injection You mentioned drag racing as one of your
persuits. If in fact you are to drive it on the road with some reliability
then turning the tap on with nitrous oxide at the drag strip will cut your
E.Ts considerably and reduce the need to modify the engine to the extent
of being unreliable
Regards Richard
" drag racing fan in England"
|
2335.3 | To n2o, or not to n2o? That is the question... | FORTY2::HOWELL | Just get to the point... | Mon Nov 07 1994 14:38 | 2 |
| I agree. n2o is far more suited to dragging than a turbo. It's an
instant grunt no matter what rpm your engine is doing.
|
2335.4 | When too much horsepower is barely enough | OPCO::TSG_BHL | | Mon Nov 07 1994 23:43 | 99 |
| to .1
good question. The rear end is quit light and traction will definitely
be a problem. I realise that I'm never going to have as much traction
as I'd like but them's the breaks.
The properly laid out five link rear end will aid weight transfer
to rear under heavy acceleration. Though there's a limit to how far you
can go before the handling gets out of sorts. The upper lower control
arms will/can be made so I can mount them differently to give different
amounts of weight transfer. What is good for drag racing may not be
good for day to day driving.
The shocks will be adjustable and whilst the springs do most of the
work, putting the shocks on their softest setting will allow the car to sit
down much more at the back. Good for drag racing but not so flash when
you want to turn a corner. I may even buy a soft set of coil-overs for
drag racing
The Australian touring car season this year had one contender this year
who would run the rear end ultra soggy and the thing would sit down heaps
at the back . Lots of traction but the co-driver wasn't keen and overall
the lap times were the same as the more normally setup cars. The team was
also accused of having a traction control since this suspension setup gave
them big advantages earlier in the season. The cars in question here are
5L V8 GMH Commodores and Ford Falcons. They weigh in at about 1300kg and
have about 550kg on tap.
The rear tyres will be fairly wide (255-265) and will be the latest
ultra-low profile ones..You get about 5000 to 7500 miles a set..nice
and sticky , but rather short lived.
The diff will run and LSD centre normally and a full spool(locks the
axles together) for drag racing and hill climbs.
The fuel tank may live behind the seats over the battery compartments
for better weight distribution.
The best bit is that the MOTEC fuel injection system has inputs for
traction control . Front and rear speed sensors will detect difference
between wheel speed and via computer controlled thresholds cut out
spark/fuel until rear wheel speed returns to within x% of the front
wheel. Obviously you can turn this off when you want to.
All of this won't solve the problem but will help. TVR's , Westfield
V8's etc all have the same problem, and they seem to cope. The 600hp
configuration is for race purposes only and I will be running race
slicks on the rear.
.2 and .3
Originally we were going to have a normally inducted 5L Rover motor
and 450hp should have been achievable . This however incurred the very
high cost of running a roller cam (A$1500) and expensive rods. Getting
rods of the right length and strength was a problem.
The turbo route was decided because it would cost the same as the motor
above but we could cut out the cost of the cam and the rods. The turbo
motor would also be less of a dog around town. The high (9:1)
compression is about what they standard rover ran anyway. We of course
limit potential horsepower , but we can get away with one turbo.
The motor won't have to rev as hard with the turbo and should be
very reliable. Rods and things which break at high RPM won't because
we'll never rev the motor that hard.
Why not Nitrous ??? good question. I like the idea of nitrous and for
drag racing its perfect. But to put that on top of the normally
aspirated motor above would reduce reliabilty even further. But I hear
you say go for a more mild motor and then nitrous. That would work but
I want horse power all the time ..I don't want 250hp normally and 500
on gas. The turbo allows me to have the horsepower all the time.
Nitrous is illegal on the street here..that is to say I can have it in the
car but not hooked up. I can have the turbo hooked up all the time so
I have the horsepower all the time. Street racing is not something I
condone , but I reckon it would be pretty embarrasing being seen off
by a Turbo Celica, because i'm not allowed to turn on the nitrous.
True the turbo motor may not be as quick at the drags , but I don't believe
the turbo will be that much slower. The car will have more than enough
grunt off the line and given a proper set of ratios should stay on
boost all the way????. Nitrous is after all chemical super-charging.
You don't have to weight for it to spin up though. The turbo lag should
be negligble because the pipe runs will be kept to a minumum and I'm
using the latest ceramic turbos from the good old USA. These turbos
have rotors that weigh 1/3 of conventional turbos and spin up almost
istantaneously.
The other reason I'm not keen on nitrous is that its not very practical
for things like hill climbs or road rallys . With the turbo I can
run big HP for a long time and not the short bursts the nitrous will
give me.
Another though of course is run a small amount of nitrous to cover
those little points when your not on boost. Sort of like having a
supercharger for low rpm and the turbo for high rpm. Thats something
i'd love , but the expense is way out there.
Thanks for the questions
Byron
|
2335.5 | | GVA05::STIFF | Paul Stiff EPSCC, DTN:821-4167 | Tue Nov 08 1994 09:25 | 7 |
| I can picture it now....
MG cruising down the motorway a bit fast
Police car comes up behind
Chase begins
hit the nitrous oxide button
Bye bye ...
|
2335.6 | | FORTY2::HOWELL | Just get to the point... | Tue Nov 08 1994 09:34 | 5 |
| I know this was all about arches, but hey you've got us all interested
now....!
Fair points made about nitrous (good for dragging but that's about it).
So why not a supercharger, then? Cost?
|
2335.7 | Sorry officer , too much giggle gas 8-) | OPCO::TSG_BHL | | Tue Nov 08 1994 22:54 | 56 |
| to .5 i can see it too , but I suspect the police radio is a fair bit
quicker. The MG should be plenty fast enough in any configuration to say
bye bye to most cops ...<grin>
to .6 .....I mentally toyed with supercharging and as you know there
are 2 sorts..the old style ones we see on drag cars etc and the new
screw type ones...they used one on an old TVR V8. and I think the last
Aston Martin had 2 of them....
The old style ones are too inefficient for my liking and I'd like to
keep everything under the bonnet..bit of a Q car you could say..The
road rules here don't allow much of anything to poke out of the bonnet,
so i couldn't go that route.
The new ones are super efficent (even more than a turbo), but they only
flow a small amount , so i'd probably need 2 of them..2 costs more than
one, and if my memories right "Sprintex" who manufacture these type
locally won't sell you a supercharger without them fitting it...I'd
rather do it myself.
Cost isn't a big issue so I suppose the main reason we went turbo and
not super charger is that the man who's helping build the car has plenty of
experience with turbo's and not much with supercharging.
I personally (non-logical biase) like turbo's more than super-chargers.
I would however like to have a small sprintex for down low grunt that
runs until the turbo's are on boost and then disengages. Koenig does
that on his 1000hp ferrari testarossa conversions he used to do.
The next question I suppose is why an MG???..Well I wanted a
convertible , I rather like MG's, and a friend had the MG with the V8
already fitted. Originally we were only going to rebuild the motor
which did , but only after boring and stroking it to 5 litres. It sort
of went silly after that.
The other big reason is that in oz the average person who builds a hot
car, builds a big V8 powered Ford or Holden (ie what they run at
bathurst). Some of them are gorgeous , but stink when it comes real
speed, handling and stopping. Though of course a Ford or a Holden
will cost less than the MG. I wanted something different that would
handle, stop and with lots of power go bloody quick. The words
"power to weight ratio" seem lost on some people, who think hey I've
got a big heavy car , so lets put in an even bigger , heavier and more
powerful motor, and that'll make it go. It may go straight pretty quick
but by geez that 300+ kg lump of steel in the front turns the handling
to shit..
To be fair though I have seen some well thought out cars. Theres a chap
in Melbourne Australia with a 8Litre all aluminuim Keith Black big
block in his 4 door holden torana (An Australian classic that came with
a 5Litre V8)....Puts out 700+hp , and in a fairly light (1200kg i
think) body goes pretty quick . He does circuit racing so its got
big brakes etc....Cost him plenty ($A90000).
I know this was about arches but who cares.
BTW I don't wish to flare the guards. I wand to keep the original body
lines.
Thanks
Byron
|
2335.8 | Fastest MG B ever? | PIECES::ALCOR::RUSLING | Place holder for NOTES | Wed Nov 09 1994 10:10 | 15 |
|
As the owner of a pedestrian MG BGT who would love to stick
a V8 into it this beast of yours sounds wonderful. I don't
suppose that you're a member of the owner's club? If you're
not, they'd be interested in you as it sounds like you're about
to have the world's fastest MG B ever.
As for power to weight, the MG B is very heavy (about as heavy
as most modern saloon cars) but it is nicely balanced being
around 52% at the rear and 48% at the front. Another plus is
that it's very over engineered with lots of metal in it.
Good luck
Dave
|
2335.9 | | FORTY2::HOWELL | Just get to the point... | Wed Nov 09 1994 10:30 | 20 |
| Did I here that jacking locations are a soft point (no pun intended)
with MG B's ?!?!
Well, so long as you don't mind us warbling on about anything else
other than arches, super ..... continue!
Well it sounds like a turbo is the route to go then. Some valid points
made. Turbo's have always made good sense in terms of $/hp and, when
looked after, are reliable too. On big engines which have a high rate
of gas flow they make more sense than small, whiz-bang type 4 cylinder
jobbies you find in your average hot hatch.
Trying to stick to the question of getting them wheels under the front
arches (and bearing in mind I know nothing of MG's) can you either put
different hubs or a completely different steering/suspension combo onto
the front so that the wheels sit 'inside' a bit more ? Maybe some
different hubs? I think some cutting of bodywork (whether external or
internal) is going to be required.
This car sounds gorgeous. Shame it's in Australia!
|
2335.10 | Monocoque with chassis | PIECES::ALCOR::RUSLING | Place holder for NOTES | Wed Nov 09 1994 10:44 | 17 |
|
The MG B is a monocoque design but with chassis rails built
in. If you look under the car you'll see that these rails run
from front to back and are about 6" in from the sides of the
car. The front "forks" bend inwards at the front. The front
metalwork was changed when BL brought out the V8, they had
to change the inner wings and some other stuff around and so from
then on, all MG B's could accept the V8 without modification to
the bodywork. The jacking points are only weak when this
"chassis" is rotten. Most MG Bs that you see around now are
not rotten as they've mostly been restored. That is, you used
to see more rusty ones a few years back.
By the way, next year is the 30th aniversary of the launch of
the MG BGT which I believe was designed by Pinafarina...
Dave
|
2335.11 | the B easty is here | OPCO::TSG_BHL | | Wed Nov 09 1994 22:23 | 52 |
|
I don't know about the worlds fastest, but it doesn't hurt to try
8-). I'm not a member of the MG owners club here..I was/am going to
join , but I was a bit concerned about what some of the purists would
say. I had a bad time once when the local RS2000 club went to a hill
climb day... I had a MK I escort with a very hot (it was then) 2L in it.
I showed up to the hill climb, but due to snobiness about it not being
a real RS2000 they wouldn't let me run...I know this is not quite the
same circumstances, but I'm a bit wary.
to .9 and .10
As .10 says the later body shells are made to accept the V8. If I had
to do this project over again I'd by one of those heritage body shells.
I might get the chance if I crash it... The chassis one mine is perfect
and never been in an accident as far as we know. Its been off the road
since 1974. and was originally a 1967 model. We will found out how
straight it is when its in to get the front crossmember done.
The reason's for the front crossmember change are numerous , but the
main on is that to get everything to fit we either needed to move the
engine back about an inch (ie chop the firewall) or move/modify the
crossmember. As you all know the crossmember is huge..a smaller lighter
one similar to what you can get aftermarket for hotrods will give us
the room and other benefits..The crossmember is being done by a local
race shop. The layout is based on some late 60's sedan racer and is
currently fairly state of the art for this type of suspension. This
shop use it on their 600hp chevy power sports sedan. basically a
chassis witha fiberglass body. Its real nice, has adjustable everything
and comes with magnesion spindles which allows the big brakes etc..
This may/will allow us some more room for the tyres..though its pretty
hard to guess what will fit and won't ..especially at the moment with
the original front suspension not on the car..
BTW: how much does a MGG 1967 roadster weigh..I've foun different
numbers from about 1097Kg to about 1200Kg...Anybody got a better
idea????...we are removings stacks of metal
Bumpers
front crossmember
steel fuel tank
that huge chung of metal between the chassis rails just behind the
grill and in front of the radiator.
Leaf springs
and numerous other bits
we are adding weight back in , but definitely less than we took out.
thanks for the interest
i'll give an update of the current state of affairs if people are
interested..to give you an idea of how far along we are
Byron
|
2335.12 | It's still an MG | PIECES::ALCOR::RUSLING | Place holder for NOTES | Thu Nov 10 1994 10:07 | 22 |
|
I'll look up how much an MG B weighs in my Linsey Porter
book. I'd say off hand though that it's nearer 1200 Kg than
1000 Kg. I had a kit car (GRP and alumnium) and it weighed
950 Kg all up and the MG is certainly more than that. When
I first got it I looked up its weight and it was only 40 Kg
less than a Cavalier SRi (whatever that is in Oz). However,
the rubber bumpers weigh a hell of a lot and the hard top adds
weight too (and rigidity).
As for the owner's club I've found everyone I've met to be
(mostly) of the very friendly dirty hands types. I've only
met one or two of the "I gave the garage lots of money and
they built me this concours winner". There's quite a lot of
ordinairy people (like me) who happen to like the cars and
are fairly handy with a spanner. Although your car is heavily
modified, it's still an MG and it does have the Rover V8 engine.
I could ask for you and I would love to see an article on
your car in the owner's club magazine.
Dave
|
2335.13 | Tell us more..... | CGOOA::PITULEY | Ain't technology wonderful? | Thu Nov 10 1994 15:11 | 10 |
| I'll stop short of saying I speak for all the members of this file but
I would definitley like to see more about your "B"east..... It sounds
very intriguing.
I am planning a trip to Oz for next August/September.......where did
you say you live????
Brian Pituley
Calgary, Canada
|
2335.14 | | FORTY2::HOWELL | Just get to the point... | Thu Nov 10 1994 15:23 | 11 |
| I second that, go for it - join the club and have an article done about
you. It's a great feeling.
P.S. Anyone see the latest Which Kit? with Andy Gibson's K3 on the
front?
He built my car, he did..... :-))))))
No, seriously......!
;-)
|
2335.15 | slowly slowly | OPCO::TSG_BHL | | Thu Nov 10 1994 22:48 | 107 |
|
I'll give the local club a ring and see what they say...I agree it still is
an MG apart from the gearbox and diff.
The article if possible will have to wait until its finished..There's
a magazine here called street machine (similar to the one in England).
Theres a pretty good chance I good get it in that mag...
to .13 I live in Sydney Australia..The car itself lives in Perth
currently and some of the hard bits (front suspension) are being done
by a friend of mine who works at a race shop. Due to strict regulations
in some states I'm actually going to have to license it in Melbourne
Australia..But I can still drive it in Sydney...The licensing part is
very complicated , but worth it to have it on the road and not just on
a race track..
Current estimates put the finish time at July-August next year. So it
should be in Sydney by early September at the latest...
The current state of play is:
The motor is assembled...
its an 1984 block....with the 4.4L crank from the local leyland V8....
We had to remove some bits from the crank counterweights to make it
clear the block. Bore is left at 3.5L size so we can retain rigidity
in the block. The bottom end has a girdle that incorporates the main
caps..Once again for strength....The rods are late model rover (89' I
think) . Pistons are custom made from cosworth blanks with gapless
rings. The Valves are Chevy....I can't remember exact sizes , but their
as big as you reasonably can go...The valves, combustion chamber and
piston tops are all ceramic coated..This gives us higher combustion
temperatures and means less heat escapes through the piston...meaning
the oil runs cooler...cool enough to not need an oil coiler....The
rockers are Australian made Yella Terra roller rockers ...very good and
blood expensive. The crank is some yank grind about 330 duration and
about 500thou lift(excuse the brain fade)...This cam gave 430hp in a
EFI 5L GMH V8 here running on hig octane unleaded. The motor still
idles fine and has heaps of low down grunt....We were going originally
as mentioned before use a roller cam with 350 duration at about 600thou
lift...a nice wild cam...we could still use it but we had to get the
cam made in the US and coupled with roller lifters blew cost by another
A$2500...Redline will be about 6500 max...
The bottom ends runs a 3 stage dry sump pump made by moroso...the sump
is made by my friend...we are removing the original oil
pump/distributor combo and running seperate oil feeds to the top if the
motor...
Induction is with a plenum chamber setup running into a hand made
manifold with 8 throttle bodies and 8 injectors..coupled with the MOTEC
system..This system is the same one used by the V8 touring cars at
Bathurst...Timing will be crank triggered.....
We are removing the water pump housing and using an electric water
pump. The water pump flows 30 gpm and with a thermostat allows quick
warm up and cool down if required. Water will run in the reverse
direction as is done on most new cars (opposite of normal)...
A plate across the front of the motor will incorporate engine mounts ..
This is like what the put on drag cars...The cam will come through the
plate and we will be using a rubber belt to the crank like on the 2L
escort motors used to have...This allows me to adjust cam timing very
quickly...retarding both cam and spark timing will allow the motor run on
normal fuel...advancing both cam and spark timing will allow the motor
to run on 104 octane and run much more boost....
The rear of the sump will incorporate small engines mounts to take load
off the bell housing....
We have found a chap who will make us Kevlar rocker covers and
a plenum/air box...The standard rocker covers are'nt high enough for
the new rockers etc...These look very cool and I've seen similar on
some of the local touring cars...
The Turbo sits out front and will feed into the plenum chamber...
The motor has not been dyno'ed yet...we are waiting on money for the
computer brain to run the EFI and for the turbo's to become available.
The turbo's are only available in the US.
Total cost of the motor is about A$16000-A$18000
The bellhousing is being made and we are going to get the gearbox and
engine placed in the car before we go any further...
Front calipers arrive at the end of this month..they're from a 944
porsche and are very light, and you can get a good range of pads for
them.
The front end is due to be constructed in Jan-Feb...I need to buy the
wheels before then and the front disks...
The rear end will follow in March
By end of March all mechanical components should be in...
The roll cage will be added
The car will then have the interior fitted and the stereo positioned.
The car will then be stripped and sandblasted prior to painting. Paint
is being done by a chap who is Roll's Royce certified.
The car will be painted and then all the stuff will be put back in/on.
by Jul-Aug it should be ready to shipped to Melbourne for licensing and
then onto Sydney..
Thats all I have time for now...
thanks for the interst...most people say I'm mad
Byron
|
2335.16 | no lag...awsome!!!!!!!!!!1 | OPCO::TSG_BHL | | Fri Nov 11 1994 05:05 | 9 |
|
Just found a very cool little device in an American mag called
Turbo and Hi Tech Performance....Its a motor thats sits on the cool
intake side of a turbo and via a magnetic clutch spins
the turbo at a speed of between 25000-50000 rpm..This keeps the turbo
mostly spun and virtually eliminates lag...sounds interesting...could
be damn handy...I will have a closer and if its good I'll buy one.
Byron
|
2335.17 | | MASALA::BHAILE | | Fri Nov 11 1994 18:01 | 19 |
| Sounds like a fantastic motor. I hate to think what the insurance is
going to cost you though. I have always fancied an mgb roadster with
the v8 engine after seeing one at a classic car show in Scotland. This
guy had bought a new heritage shell and fitted a 3.9litre v8 with 5
speed manual box. Various other suspension goodies leather interior and
straight thru exhaust. With centre knock on chrome wires and painted
tartan red it looked tremendous.
I couldnt quite afford something like this so I bought a Triumph
spitfire mark 3 fitted with fancy suspension and a 170 bhp 2.5 litre
petrol injection engine as found in the old tr6. The car handles like a
dream and I regularly come well up in classic rallyes etc. Burning off
your average boy racers and some power saloon cars in a 1968 none
badged spitfire is pretty satisfying but even more pleasing is the
insurance 125 uk pounds fully comprehensive agreed value with rac cover
thrown in!
All in all it adds up to a car of your dreams which doesn't cost
that much to run.Wish you luck with your project. Any chance of a go
when its finished?
brian.
|
2335.18 | nothing clever this morning | OPCO::TSG_BHL | | Mon Nov 14 1994 00:48 | 31 |
|
Insurance is not too bad...There are groups who will insure legally
registered "Street Machines"..They are underwritten by some larger
insurance group...This is actually very cheap...because people
who build such cars look after them and probably take much greater care
than the average person (apologies to any average persons 8-) )....
I am however limited to the value I can insure the car for..Its usually
agreed value based on what you could sell it for. Realistically my MG
is costing about $A60K+ ..I could only insure it for about A$30K.
You do however get first option on the wreck if its written off....
I have to say though that the expensive bits are the components.
ie Brakes/wheels/tyres/diff/motor...The body itself is a small
component. So I could probaly afford to rebuild if its was written off.
They have different brackets based on KM's per year...some people have
show cars that don't do more than 5K a year....
Total cost of insurance will be about A$1000 per year which is pretty
good...
This of course goes higher depending on how high I can get the agreed
value...I did see a concourse condition MGB roadster the other day in a
prestige car shop and they wanted A$30K ...I'd never seen one priced
above about A$20K before....Must be very original.
My girlfriend loves Triumphs ..she doesn't have one now but had a
series of TR3's, TR4A and a TR6 ...maybe soon we'll by a TR4A again
(her favourite)...lovely cars...
Byron
|
2335.19 | getting there | OPCO::TSG_BHL | | Tue Jan 31 1995 05:33 | 56 |
|
An update if anyone is interested???
I've bitten the bullet and gone with the 18" wheels on the front...
they are 225/40 18"'s which are the skinniest 18's you can get...
The 8" rim will stay however to give me the option of the 235/40
later on if need be...that 10mm drop from 235 to 225 will help the
fitment under the guard...we may have to flare the guard slightly
but thats life.......
The front suspension is to be hand crafted next month...
We sourced Porsche 944 hubs/944 turbo calipers and a set of new steel
ventilated disks from a 968...for not much money...this will sort out
the what to do for hubs etc....The porsche hubs are magnesium which is
good...the hubs also have ABS wheel speed sensors built in, which will
make it easier to hook up the traction control....
The motor/gearbox have been placed in the car and engine mounts etc
fabricated...
The electronic dash is being ditched (for cost reasons) in favour of
some nice VDO guages...this saves about $A2k...The MOTEC fuel injection
system can take up to 14 auxiliary inputs and will light up a warning
light if preset limts are exceeded..this reduces the amount of
instrumentation needed to a minumum...The MOTEC also has a hand
controller which will give you detailed info on what happened and you
can program the entire system using it...I can't imagine mapping out a
full spark/fuel curve on it however...The MOTEC stores all of its
telemetry info onboard and can be downloaded later...I'm not sure how
much data this actually is...Also the MOTEC can do an action based on
an input (sounds like Polycentre watchdog)...ie if oil pressure drops
below a preset limit it will autmatically kill spark/fuel in a blink of
an eye...Basically one big clever toy....
2 other items of interest is some trick stuff they setup for the OZ
rally champions celica.
1) "Drag start" or something like that...You put your foot to the floor
and when in "drag start" mode it will hold the RPM at the preset
limit...as soon as you release the clutch it removes the restrictions
on the engine and bingo your at full boost....
2) "Flat change"...or how to break drive trains....When you hit the
soft rev-limiter...the EFI cuts the motor momentarily, allowing you to
pull the gearlever straight through to the next gear...you don't lift
your foor off the accelerator...hence the name flat change.
Interesting stuff that I may toy with...the Drag start could be useful
the flat change may cost too much 8-)
I've almost decided on what stereo to put in the car and will rabbit
about that later...
Thanks for your time
Byron
|
2335.20 | | FORTY2::HOWELL | Just get to the point... | Tue Jan 31 1995 09:25 | 1 |
| Dan$still_listening_and_interested_in_the_stereo_bit
|
2335.21 | | PLAYER::BROWNL | An Internaut in CyberSpace | Tue Jan 31 1995 12:30 | 3 |
| He'll never be able to hear the bloody stereo!
Cheers, Laurie.
|
2335.22 | Ah, the music of valve trains.... | CGOOA::PITULEY | Ain't technology wonderful? | Tue Jan 31 1995 19:42 | 5 |
| So who would want to? I'd be more than busy enough with other
things...
Brian from Canada
|
2335.23 | boom boom | OPCO::TSG_BHL | | Tue Jan 31 1995 23:32 | 53 |
|
The stereo....
Because the cars got no roof ...the advice I was given by one local
shop was to concentrate on getting the sound in the front of the car...
rear fill is nice but its just going to go straight out into nowhere....
They showed me a Mazda MX-5/Miata...that apparently has won a number of
"sound off" events...It had Polk MM3080's in the front doors and as far
as I could tell that was it..I don't know what head unit and it used
Precision Power amp(s)...The polk MM3080's consist of 8" sub,5.25" mid
and a tweeter...
Anyway this influenced my decision and the equipment list is as
follows..
Alpine 7514S radio/cassete head unit
Alpine 5960 6-disc CD changer
Polk MM3080's in the front doors. Power rating 15-150 watts...4 ohm load
Kicker F10a 10" sub in the back between the seats...power rating 300 watts.
..4 ohm load...
The boot of the car has been moved forward to enclose the open area that is
normally behind the seats...This means that the sub will be only be
about 5-7" behind the seats..to keep weight down this needs to be a free
air woofer...
a dry sump tank takes up the room that would be required by a sub
box.had 2 10" subs side by side...they would be playing straight into
the back of the seats (which are kevlar race seats) and as such most of
the sound would be reflected straight back into the speaker....Thus 1 10"
should be able to play cleanly through the gap between the seats...
To power this lot i'm looking at using a Alpine MRV-F400 amp...This amp
is a 4 channel amp and in my config will give 2*40w (at 12V) to the front
and 1*100w (at 12V) to the sub...at 14.4v it gives 2*60w and 1*160w...
The amp has built in crossovers....and will give more power into 2
ohms.
I'm a bit concerned that there won't be enough power to the front
speakers..a topic I've taken up in rec.audio.car..so we'll se what
happens....
Its Not a monster stereo either...because I want to keep the
weight down and avoid having to big an alternator/multiple batteries...
The car will not be terribly noisy....the turbo kills most of the
pulses and takes the bark out of the exhaust..so hopefully a couple
of big straight through mufflers should keep it quite..
I'm definitely not after a noisy boy racer car....quite'ish is good for
me....(well I want to hear the turbo whistle 8-) )
Byron
|
2335.24 | closer and closer | OPCO::TSG_BHL | | Tue Apr 11 1995 08:59 | 34 |
|
Well...more than a month has gone and the front ends not done yet...
Anyways the car is going in next week to do the front suspension
the diff and rear suspension....
The rear will be using AVO shocks at this stage and the fronts will use
adjustable spax shockies....The roll cage will be added at the same
time..
The motor is in after massive delays associated with the bell
housing...
The seats have been chosen..they are single piece kevlar seats made by
MOMO and have seperate driver and navigator ones...The steering wheel
is also MOMO....
I got the POLK speakers and will be installing them next week..
The stereos changed slightly...same speakers...but I'll be using
Kenwood gear instead of Alpine...I personally prefer Alpine...but
a friend who works at Kenwood can get me stuff at cost price....
I'll be using a Kenwood CD changer and radio/cassete unit....
I've gone for bigger amp(s) since I can get them for the right price...
There is now 2 and both put out 110w rms * 2...or 260w rms * 1.........
I should be able to here them even with the exhausts off 8-)
I don't have model numbers on me....
Its getting closer....
Byron
|
2335.25 | | WOTVAX::GILLILANDP | Not very Tuna-friendly | Tue Apr 11 1995 10:01 | 3 |
| And don't forget a new full stop key for your keyboard.
Phil Gill.
|
2335.26 | | FORTY2::HOWELL | Just get to the point... | Tue Apr 11 1995 10:22 | 10 |
| re.-2
Sounds good! Keep us up-to-date on it, won't you?
re.-1
Arf!
Cheers,
Dan
|
2335.27 | absolutely positively for sure! | OPCO::TSG_BHL | | Wed Apr 12 1995 05:56 | 14 |
|
to -1
absolutely
I forgot to mention the clutch...we've decided to go for a Tilton twin
plate rally/road clutch...Its a twin plate job that will take 600Lb-ft
of torque...Its really a race clutch..but its got a bit of takeup so
that its not so on and off on the road...
Thanks for the interest
Byron
|
2335.28 | ... | WOTVAX::ROWEM | Frank Gamballi's Trousers | Mon Apr 24 1995 14:59 | 6 |
| Gerroff 'im Gilly, don't you know that Aussie keybords have a special
... key for knockin sense into whingin pomms ??
:-)
Matt,.,,..
|
2335.29 | on all 4 fours | OPCO::TSG_BHL | | Sun Jul 02 1995 04:08 | 67 |
|
Hi all,
Its been a long time...well as with any car(computer) related project
things are always overtime and over-budget...the MG being no
exception...
Well, all the suspension works been done, and the car is
finally sitting on its own 4 wheels(thought i'd never see the day)...
The drivers seats in and positioned...the car looks absolutely
amazing..The wheels make the car look wild...speaking of wheels, since
I went for the Porsche stud pattern all round, I managed to get hold of
some space saver spares for use as spares...cost naff all 'cause nobody
ever buys them...the cars going to look pretty daft with the spare on
8-)
The roll cage was also installed and extends to both front and rear
shock towers...no scuttle shake in this baby...In order to make the car
be safe and not look stupid I made the 2 bars that connect the rear
hoop and front hoop together removable...This means I can cruise
without it looking like a sedan with roof lopped off, and have a safe
car that will protect me when I roll it (this is not something I want
to happen 8-) ).
The front shocks are Traxspax(light rebuildable race shocks). the rears
are AVO adjustables...
The rear end got the full watss linkage and a proper(swivels in the
middle) panhard rod...
In April I put the speakers in the doors. man what a job....17hours
it took me with help...I reckon a professional could have done it in half
...but I saved some money anyways...
Meantime....my mechanic friend who does all the really hard bits. Got
delivery of 2 race motors from the US...ones a 5litre Ford motor that
goes in the local (OZ) touring cars...this motor has all the real nice
goodies...Kryptonite crank and rods and wiseco aluminium pistons..these
motors will rev to 8000rpm for 8hours plus with no problems...
This coupled with (a) reading about the 7000rpm rover 4.3litre kit..
(b)a lot of computations showing that more rpm means not only more
grunt, but a faster car...because of the higher redline you get a lot
more out of the car, even if you get no more HP...gear ratios will do
this also...but they ain't cheap or easy to find...
(c)stupidity and (d) this sort of work is dirt cheap in the US...ie
$US4000 for crank/rods/pistons..all custom made and fitted...
So the motor is on a slow boat to the US now and will be back sometime
around october with lots of bulletproof internals....
Kryptonite is some mega-strong alloy...stronger than forged steel and
lots lighter...I can get a set of custom rods in kryptonite for the
same price I can buy forged steel ones from Real Steel...Having seen
the bent forged steel rods out of a turbo 944 race car my friend was
working on, made me go this route....The 944 rods bent because of the
sheer amount of grunt the motor made...500Lb-ft of torque at 5000rpm
out of 2.5litres...It would have made more, but the torque was so great
the rods bent..something had to give...
The capacity will go up to 5litres again, and will have a longer stroke
than before...meaning less stress on the rods/crank and since the
motors even more oversquare..it should rev even quicker..
Thats all folks
Byron
|