In Reply to: M3 drivetrain thoughts . . . posted by Jason Blitz on August 02, 2001 at 12:12:53:
Don't know how much this will help, but I have the following observations:
1) I had a 95 M3 that had an overreved motor(yes, I did it, 3rd to 2nd @ redline - ouch) this happened in 1997. I tried looking for a 95 motor to bolt in, but 95 was the only year that the 3.0 liter was made, so price was a premium($11k) and they were hard to find.
2) I started looking for a solution to put a 3.2 liter in, but most people said that would be difficult because of OBDII etc. I contacted Korman Auto(Ray&Sean), and they said that they had done this swap the previous month to a customer's car(very common to overrev) - they sold me a chip to go into my OBD-1 computer & stated that I could adapt a few of the sending units to the OBD-1 computer and to just plug-up the holes for the additional OBD-II sending units(O2 sensors etc). I then went for a guick look to see if I could find a 3.2 liter - very common in junkyards(that's why most conversions of E30/M3 drivetrains are 3.2 liters, ex: Zionsville auto car) anyway, because the engine is readily available, I could pretty much choose that mileage and how much it cost. I found one with 14k miles out of a roll-over for $5k complete- half the price of a 3.0 liter 95.
3) Here's where the fun comes in. The 95(3-liter) intake flows twice the CFM of the restrictive 97(3.2-liter) intake. It actually outflows the Schrick aftermarket one too. This accounts for the no-change-240hp in BOTH displacements. The 3.2 headers flow 70% better than the 95's did, so I kept those too.
4)Anyway, long story short, the OBD-1 computer combined with 95 intake and 97 motor and headers put out 278hp - a nice bump for factory parts! So, in my opinion, start looking for an OBD-1 computer, a 95 M3 intake(which if I'm not mistaken may be the same as other motors) and a 3.2 liter out of a 96 or newer M3.
I hope that helps!