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Sponsored by: SmartAutoWarranty.com Discuss Forced Induction on BMWs with SmartAutoWarranty.com (turbos and superchargers).
is yours a 325? i think a 35r might be too big, maybe if you got the smaller exhaust housing, .63 i think. i went with a .82 for my 328. another option is the sc61. i believe it has the same compressor as the 35r except is not dbb and has a different exhaust housing. it is a very capable turbo and is less $$$ than the 35r. dbb will help spool greatly.
it also depends on how you want your car to drive. do you want it to pull hardest in the topend, like your 325 does now, or do you want more low end power? i think going with a laggier turbo will just help with traction issues down low. if you want quicker response go with a smaller exhaust turbine, and for a bigger topend go with a larger housing.
yea it 325i m50
man i wish i had yur knowledge man if maybe we can do like a IM sometime i or go to Ub chat id like to ask sokme questions.
sounds like a dumb question but what would be the a/r or the example .70 or .71 <-- thats where im having trouble
A/R is your area: radius ratio. Area being the cross sectional area at the inlet or outlet depending hot or cold side. The radius comes from the measurement from the center of this cross sectional area to the center of the turbo. The larger your area to radius ratio is, the more pwoer you could make, but this will also has the negative effect that if you go too big you'll basically take a lifetime to spool (if you even can).