S54 advice and considerations

[Wh33lhop]

Extra clutches adds MU by doubling surface area; just like a single/double/triple plate tilton for 1,000hp++ supra.

I get how that is supposed to work but that would require a mating friction surface as well. I was under the impression that you just stack the clutches which would do nothing for surface area and just act as a shim. I guess I was mistaken--which is good, because it would be pretty dumb to do it that way.

[Wh33lhop]

Thanks! I was thinking I was going to have to be the ass who points out what Torsen is... ;)

Like Wanganstyle said, changing the number of clutch disks changes the relationship of locking torque to clamp load on the disks.
IE, (pulling numbers out of the air) a 45 degree ramp with a 2 plate clutch pack might deliver 200 ftlbs of locking torque at a given driveshaft torque. The Bellville spring might give it 50 ftlbs of locking torque from preload.
The same ramp with a 4 plate clutch would deliver 400 ftlbs of locking torque at the same driveshaft torque. The same bellville spring in the 4 plate unit would have 100 ftlbs of locking torque from preload, BUT using a softer bellville spring can drop the 4 plate unit back down to 50 ftlbs.

So the number of disks *DOES* affect the slope of the locking torque vs drive torque curve.
LJ851 posted while I was writing, but I already knew what a bellville spring is ;)

Again, I got that in theory, but from how people were talking about building a diff it seems like they were just stacking the clutches one on top of another, which made no sense. A simple misconception is all.

[giantkeeper]

Soo, about those S54's :D

[Wanganstyle]

as far as S54 news is concerned; currently working on a parallel DME solution to allow for "obd2" port function with S54 and OBD2 non s54 DME......

Soo, about those S54's :D

s54 port porn.




silly little fingers are awesome.


hiding in the woodwork, machine shop was double thumbs up on all the OEM CNC work.

[Thing30]

Anyone have personal experience with SC Typhoon ECU...

[VinniE30]

Would a M42 radiator work OK with the s54? Cooling capacity? Seems like it works just as good as the other radiators with the 24v swaps.

[e30m3s54turbo]

VinniE30 m42 should work.

[VinniE30]

This would be so cool:
All aluminum M42 style radiator with built in reservoir

[gobuffs]

I added a roundy round all aluminum triple pass radiator for $199. Cools better and cheaper than anything you'll find that is specific for BMW and is 1/3 the price.