M3 diff in a 135

[Kiwi Peter]

Hi all today we did rear subframe M3 bushes in a E82, Since we have a complete rear end from a 335 E92 kicking around i thought i would do a measure up.
Hey presto it will fit just fine. So in conclusion a complete M3 E90/92 rear end will fit the E82 Just like in the 1M.
Could be a real nice upgrade for some one building a tough car on a budget.

[chachacha28]

so with a m3 subframe, would an m3 diff bolt right in? might be a dumb question.

[Kiwi Peter]

Originally Posted by ezeedee

so with a m3 subframe, would an m3 diff bolt right in? might be a dumb question.

Hi there
Yes you just need to purchase a complete M3 rear end and bolt it in the car
just as i did with my 335.
You will have to modify the drive shaft and use the M3 rear brakes you will also have to use 19in wheels with the 135 offset and that is it.
The best thing is that you have many diff ratios to choose from no more welded diff gear , M3 arms, super strong half shafts and CV joints, M3 bushes, and a super strong subframe.

[CrustyNoodle]

Maybe someone should set up a conversion service - hint hint

[MrBlonde]

Now that is very interesting ...

[Jeef Beef]

So if I get his before Raihax does he's screwed for finding someone who'll do this in Perth.

I'll take it

[alik01]

Might be a silly question, but what about the front end grip and balance? Wouldn't the added grip and stability from the M3 rear just cause the car to understeer every which way?

[Kiwi Peter]

Originally Posted by alik01

Might be a silly question, but what about the front end grip and balance? Wouldn't the added grip and stability from the M3 rear just cause the car to understeer every which way?

No as this is no different than fitting a Quafe LSD unit, i think that the M3 mod is something that you would do if you were building up a toy for track days etc. If this was the case you would change the front suspension and so on etc.
I mean trying to find a E90 M3 arse end is hard as there are not many being wrecked, Just maybe the price has gone up now that we know they are a bolt up mod for the 1 & 3 series. OOOO well at least i have mine

[RaihaX]

Originally Posted by Jeef Beef

So if I get his before Raihax does he's screwed for finding someone who'll do this in Perth.

I'll take it

don't make me move to Sydney

[alik01]

Originally Posted by skycat

No as this is no different than fitting a Quafe LSD unit, i think that the M3 mod is something that you would do if you were building up a toy for track days etc. If this was the case you would change the front suspension and so on etc.
I mean trying to find a E90 M3 arse end is hard as there are not many being wrecked, Just maybe the price has gone up now that we know they are a bolt up mod for the 1 & 3 series. OOOO well at least i have mine

Thanks for the excellent explaination Skycat. I always like reading the technical explainations from JD and yourself. I now see why Advan is so highly regarded in your parts.

The demand for wrecked E90's probably just went up considerably, which in time might mean more being written off rather than repaired.