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  #1  
Old 19th March 2008
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Default RWD conversion

I know this has been done to death.However I am not asking if it can be done,rather what a good manual transmission would be for the conversion.

this is what I would want in the gearbox:

*Narrow design-to minimize footwell intrustion
*Abilty to hold 350 or more HP
*5 or 6 speed, with gearing somewhat similar to existing ratio's if possible
*Something sorta common that could be found in a junkyard

also what would be a good,strong rear diff that coulda handle that sort of power and have options for a LSD,IFS/IRS if possible.

As for what I thinking,how about a RWD C900,with 350 hp SAAB engine, manual transmission,and Rear LSD.However a major point is money,so im not looking for skyline transmissions, or built manuals...
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Old 19th March 2008
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BMW. There was talk about this previously, and someone came up with an adapter plate to do a saab motor to BMW trans.
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  #3  
Old 19th March 2008
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Quote:
Originally Posted by IronJoe
BMW. There was talk about this previously, and someone came up with an adapter plate to do a saab motor to BMW trans.
What he said.

I think it was an E30 3-Series trans and a B234 that came together with an adapter plate.
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  #4  
Old 19th March 2008
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how expensive is a E30 transmission?

I was asking about stuff that could be found in junkyards ,like T5's outta mustangs or something.a BWM trans could be very well over 3000...
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  #5  
Old 19th March 2008
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BMW gearbox is horrible if you want to take power. You should get a Rockwell 5-speed or a Tremec / Borg Warner T-56 6-speed (as used in Corvettes, Vipers, and friends).

BMW E30 tranny should be cheap at u-pull. There are plenty of junk E30 out there, they are like C900.

But these are gearbox designed for measly 100 or 120 hp engines with low torque, hell C900 gearbox is for a 120 to 185 hp engine with much more torque so think about that

Borg-Warn T-5 also could work but could have failure at high torque. Tremec TKO from swoopy-body V8 Mustang might be interesting to you.

Remember it is not the power rating for the gearbox, but TORQUE rating. If you can make the engine spin very fast (like 8000 r/min) you can make more power with less torque, and thereby reduce strain on gearbox. You can put 300 hp reliably through C900 gearbox if you turn 8000 revs when doing it
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Old 20th March 2008
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i personally plan on using a transaxle off of like, a corvette that way you don't have to worry about making a transmission tunnel, you just gotta make a little more room in the back...
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Old 20th March 2008
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hmmm.what are all of the cars that are longititudinal FWD vehicles whos transmissions could hold as power as I would like?I know cadilac in the 80's had longitudinal FWD's powered by V8's,but those would probally be automatics...
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Old 20th March 2008
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Quote:
Originally Posted by mikewitdaspike
i personally plan on using a transaxle off of like, a corvette that way you don't have to worry about making a transmission tunnel, you just gotta make a little more room in the back...
well you probably would have to cut out and raise the center tunnel through the cabin, switch the fuel tank for a relocated fuel cell, and probably do some work to the floorpan in the hatch. That and mount the engine backwards
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  #9  
Old 20th March 2008
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welllllll I some Volvo guys use a Supra 6 speed transmission (not easy to find) they're light small-ish, and they can handle almost 600 hp in stock state....

I have considered cramming a 2.3 Liter turbo built up, mated to a supra trans, to a Custom Ford 9" rear end or more likely a Ford 8.8 from a Ranger or Mustang.... all into a 99 Salon...

Crazy... some day

Have also considered a 99 Salon with a 2.3 turbo mated to a Subaru WRX transaxle feeding a Ford 8.8

I think it's definitely do-able
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  #10  
Old 20th March 2008
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Quote:
Originally Posted by GearHead
hmmm.what are all of the cars that are longititudinal FWD vehicles whos transmissions could hold as power as I would like?I know cadilac in the 80's had longitudinal FWD's powered by V8's,but those would probally be automatics...
GH

The only car OTHER then a Saab that Has a Longitudinally mounted engine that is FWD that I know of is an Oldsmobile Toranado.... They are impossible to find and the trans are HUGE....

All Cadillacs that I have ever worked on seen that are FWD are Transverse mounted....I could be wrong

I think you could transverse mount a 9000's 2.3 engine and trans in a 900 without having to redo the suspension, would be tricky but possible
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  #11  
Old 20th March 2008
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The Eldorado / Toronado / Riviera had a longitudinal transaxle in the 70's and early 1980's, this was the Turbo-Hydramatic 425 - a huge thing...

The 1980's newer models used a transverse V8 and gearbox.

Audi uses longitudinal engines
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  #12  
Old 20th March 2008
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old renaults were too.

and the old 60's Triumph 1300 FWD on which the saab layout is based...
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  #13  
Old 20th March 2008
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check this thread out for how to do it using a Saab enginehttp://www.saabcentral.com/forums/sh...49#post1151349
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Old 20th March 2008
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I know I started a rear wheel drive thread a while ago, and although I'm still looking for another T16, I'm not so sure I want to follow that route anymore..

Before I left the UK I came to realise that I loved the driving characteristics of the c900, it really used to make me smile fighting with the tourque-steer when you're on the edge of traction whilst screaming round a bend, and to convert it to RWD would change that completely.
And I guess you could say I've changed my driving morals too, although performance is fun, and I'll still go down that road, what I really want is a really sharp looking c900 that everyone stares at, and comments on.


Although I'm still undecided weather I'd want to do it or not, I have changed my idea on how I would do RWD, and I'll throw it out there for all you guys to consider:

Eventually I really didn't like the thought of hacking up the majority of the car, i.e. the firewall, putting in a trans tunnel, then having to cut up the back end for new suspension.
So I came around to the idea of cutting out the front end off a 9000, and placing in the back of the c900. I realise I sitll have to cut up the rear end, and move the fuel tank etc etc, any conversion like this isn't going to be easy.
I know the shift linkage would be the main problem here, but that can be resolved.

I also know a lot of replys for this will be "the 9000 has a week gearbox too" and "the wieght dist. will be bad"
Well for the gearbox check out maptun... they have a nice set of cogs to put in the box (all be it for a hefty price, but in the long run would be worth it)

And for the weight.. all I can say is look at the porsche, and the 911, it works for them
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Old 3rd April 2008
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Here you go:

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  #16  
Old 3rd April 2008
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the crank pulley in that thing must be a cinch!
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  #17  
Old 4th April 2008
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that just put a huge smile on my face

I love where the intercooler piping and intake lead to..
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  #18  
Old 4th April 2008
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i have heard that the mazda mx5 gearboxes are quite tough, and being an mx5, it shouldnt be that big either
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  #19  
Old 4th April 2008
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Quote:
Originally Posted by philb
Here you go:

hey thats cool
wierd though

what they should do is drop one of them back in the front and make it all wheel drive
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  #20  
Old 30th August 2013
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Quote:
Originally Posted by IronJoe View Post
BMW. There was talk about this previously, and someone came up with an adapter plate to do a saab motor to BMW trans.
Sorry to bump a reallly old thread but i havent been able to find any info on this adapter plate.

a rwd c900 is currently in the works using stuff from ovlov and bmw. the engine will be a pre 94 b234 using trionic 5.
I would really like to find info about this adapter plate since this is the next big obstacle in this build.
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