Quote:
Originally Posted by XutvJet
You'll get higher numbers running in 5th (assuming you're not heat soaking), BUT it's a lot harder on the motor, especially in the lower rpms because you're creating a very high load situation going full throttle and 2,000rpms (i.e., low rpm, heavy boost). High load can create over-boosting at boost onset and worse, severe detonation. The 5th gear run will generate a more heat as well because......it's a much longer run. I would strongly suggest running in 4th. It's just better for the motor and you should still get very solid and usable data. If you want to know what the 5th gear numbers are, simply multiply by 1.5% and that will give you a general idea.
If it's available, run 93 octane. Put the biggest fan(s) you can in the front the IC and radiator.
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Great advice! Think FSociety mentioned that too.
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2k15 335i Msport xdrive 6spd
Wagner Comp2 FMIC,FTP CP,stock exhaust. Fabspeed Sport catted DP, KW V2 coil overs,FBO BM3 Stg 2