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JL8Jeff · 11-17-2007, 04:21 PM

I have the Diablosport Predator that has some diagnostic abilities to it and I was checking out the car on the highway today. I noticed the long term fuel trims were pretty much sitting around 9.5 to 12.5 % which seems kind of high. I have the ported TB, a lid, the airbox mod and cut the EGR tube and it looks like it has helped airflow a lot. Is there a fuel trim range that means it's time for a tune like 15% or 20? I plan on putting headers on shortly so I don't want to think about a tune yet.

11-17-2007, 04:21 PM	#1
JL8Jeff Hippy Mod, Bergermeister Meisterberger, Moderator Join Date: Aug 2004 Location: Ewing Posts: 6,216 iTrader: (3)	Fuel trim numbers? I have the Diablosport Predator that has some diagnostic abilities to it and I was checking out the car on the highway today. I noticed the long term fuel trims were pretty much sitting around 9.5 to 12.5 % which seems kind of high. I have the ported TB, a lid, the airbox mod and cut the EGR tube and it looks like it has helped airflow a lot. Is there a fuel trim range that means it's time for a tune like 15% or 20? I plan on putting headers on shortly so I don't want to think about a tune yet. __________________ 69 Z28 JL8 4 wheel disc brakes - being restored 09 Silverado Z71