Bit of a newbie question but I have sourced a M90 from a 96/97 year and would like a bit more info in regards to fitting it.I have read that to make this conversion work with the B234 block I will need to use a M47 flywheel and clutch cover and an M90 tdi clutch plate.This set up if the info is correct will be able to handle 300bhp. Could anyone let me know if this is correct or if they would advise on doing it a different way with say upgraded parts. Thanks for any replys.
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M90 Gearbox Conversion.
- Thread starter katluke
- Start date
professor245
New member
- Joined
- Jul 6, 2009
- Location
- Serbia Belgrade
As far as I know if the M90 you got is for redblock not whiteblock (different bellhousing) it should be direct fit, with M90 flywheel, clutch etc...
ZVOLV
<Master Tech>
- Joined
- Nov 19, 2002
- Location
- California
Sure is a lot of info on that thread.JW240
All idiot, no savant
- Joined
- Aug 15, 2004
- Location
- The Netherlands, Europe
you can keep the flywheel you have now, even the pressure plate, in theory you can get a M90 diesel or 850 GLT plate and combine that. But i'd just get an M90 diesel clutch set if you want to stay with the stock flywheel.
The M90 TDI set wont take 300 hp, i've seen them slip at lower power levels, but this is of course totally depending on the torque the engine puts out. TTV-racing sells a very nice billet flywheel for roughly 200 quid, that together with the 850R 240 mm clutch set is a good/elegant way to get a clutch that can take a beating but still uses easy to source/cheap wear parts. Price-wise probably one of the better options too, the SRE clutch for the dogdish flywheel isnt cheap and comes with a clutch disc thats splined for the M46, besides, i dont think it will take more than the 850R set.
The rest is easy, it is plug and play, make sure you have the driveshaft, shift linkage, support x-member etc too.
The M90 TDI set wont take 300 hp, i've seen them slip at lower power levels, but this is of course totally depending on the torque the engine puts out. TTV-racing sells a very nice billet flywheel for roughly 200 quid, that together with the 850R 240 mm clutch set is a good/elegant way to get a clutch that can take a beating but still uses easy to source/cheap wear parts. Price-wise probably one of the better options too, the SRE clutch for the dogdish flywheel isnt cheap and comes with a clutch disc thats splined for the M46, besides, i dont think it will take more than the 850R set.
The rest is easy, it is plug and play, make sure you have the driveshaft, shift linkage, support x-member etc too.
MadDog_945
Våga Vägra 8V
- Joined
- Apr 25, 2006
- Location
- Lower Saxony
Do Not make the mistake and buy the 850GLT clutch... 
do buy the M90 Diesel clutch and be happy...
do buy the M90 Diesel clutch and be happy...
crogthomas
Active member
- Joined
- Jan 30, 2008
- Location
- UK
What JW240 says is spot on, but one more note. If you're using the clutch actuation parts from the M90 gearbox (which would have originally have been fitted to a car with a DMF) with a TDi clutch and solid flywheel, you'll have to extend the clutch pushrod. If you don't the slave piston will just plop out of the end of the cylinder. Don't ask how I know.
After taking a few measurements from the clutch I made another rod 100mm long (std is 80mm). Seems to work fine so far.
After taking a few measurements from the clutch I made another rod 100mm long (std is 80mm). Seems to work fine so far.