E46Fanatics - View Single Post - 260 rwhp 323i 99 e46 with orig motor and no super charger!
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Old 11-30-2009, 05:49 PM   #9
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Originally Posted by bluejeansonfire View Post
if you've ever had the chance to compare the ports on the heads of the m54 and the m50 family, then you know the m54 could use improvement. (I will refer to m52tu as m54, it's all the same family). At the very least, I would port .5" into the port to port-match to manifold, which is probably m50 based (m50,m50tu,s50,m52,s52)... of which the basic castings are all the same. I would port as much as 1" into the exhaust port to try and achieve the smoothest port-match.

As far as turbo, to really use it with a m52tub25, it needs to be built. Otherwise I feel it's tremendously oversized. You should experience 0 dropoff at upper rpms, but with the boost levels, displacement and compression ratio you have, it seems to me that a gt28 would be far more appropriate blower that would yield similar numbers with a far earlier spool. With the TT t3/t4, at 8 psi I made over 300whp on a very conservative dyno. Granted your motor is smaller, but I think you will manage better curves, much more area under them with something smaller.
I'd have to agree here. If your not planning for anything greater than 3 a 57trim/ gt28rs would have been perfect. In terms of driveabilty. Even a gt3076r divided would have made good power in the 500's. W/ a quicker spool than your gt35. All in all I'm sure you'll enjoy. Jumping straight to a 35 means somebody may just have big plans
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