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 low load situation (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 you can in the front the IC and radiator.
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Thanks man, I appreciate all of the info.. I will make sure they have all possible fans on (they have a bunch) and sadly its 92 octane here in WA. At least its not 91 like CA.