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YOUR RESEARCHRWD C4 possible purchase
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Replace gearbox
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Suggestion
And must admit I have pondered on doing similar instead of just replacing the seals
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Suggestion
Has the front suspension etc been replaced with C2 stuff?
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A friend of mine is very close to buying a C4 that's been changed to rwd, he's sold his M3 to buy a 996.
Is there any real reason why this would be done, are there any real problems with this conversion, I've got a C4 and have never contemplated this so just wondering why. The car in question has GT3 suspension fitted also so there must have been a few pound spent to make this work. I told him I'd ask here, I've no link to car etc as it's no advertised it's a word of mouth sale
Been advised that my front diff seals were weeping slightly at my last service
And must admit I have pondered on doing similar instead of just replacing the seals
But it was only reading this that did even remind me of it to be honest!
I did think that it may give extra complications if I were to sell it on
The cheap way is to just remove the 4wd gubbins and even that is said to result in a decent and reliable improvement (i.e. it's not a bodge, rather it's a pretty recognised mod that removes some weight and drivetrain losses)
It sounds like this has been done with little expense spared to really get a desirable combination. Wouldn't put me off but I'm all for modded cars. Depends how much your mate is happy with modifications as to whether this is a good buy for them.
How's does the PASM etc work? Is it all through the ABS or will removing the front set up have an effect? Has the front suspension etc been replaced with C2 stuff?
I looked at this when my diff needed to be re-built. I gather it's straightforward - just remove the front/centre diff and drive shafts etc. I recall reading somewhere that this is basically what's done when tuners really crank the turbo outputs up as the AWD only copes up to 600bhp or so and thereafter it's better to convert them to RWD.
My guess is that the diff gave out (carrier bearings probably), and the owner didn't fancy a £4k bill to put a new one in (Porsche only sell the whole unit). At which point, dumping the diff and putting some of the £4k into GT3 suspension doesn't look like a daft plan.
Stability control is entirely through the ABS - the centre diff is 'dumb' in that it works entirely mechanically to apportion torque so isn't under the influence of the stability control electronics. Hence, its removal makes no odds to the PASM.
And yes, the C4 chassis is re-enforced and was the basis for the GT3 chassis (although that may well have had some additional tweaks.
PSM only controls power delivery to the gearbox, not individual axles or corners and applies braking to the relevant wheel to keep the car stable. Removing the ability to drive the front wheels wouldn't affect what the car decides to do. You'd probably have the PSM activating more as a 2 wheel drive than a 4 wheel drive as the traction wouldn't be the same.
I just text my mate and he has sent over what was done.
4 wheel drive fully removed but still has original gearbox with prop shaft output.
C2 hubs (not GT3 hubs) to suit the GT3 suspension. Original brake callipers used as these fit the C2 set up.
Sounds sensible. No real reason to change the gearbox. GT3 front hubs have slightly bigger bearing and a wide bolt spacing for the calipers, they are also a lot more expensive. The C2 ones are shared with most versions ofvthev986 Boxster and can bbe had for under £50 each.
MC
