Hello all,
I have a 2004 3.8L GTP competition group that I recently changed over to E85 (kind of). Modifications are as follows; E85, 3.0 pulley, 60# Siemens injectors, 1.8 roller rockers, pacesetter headers, wizair CAI, fuel pump rewire with new AC Delco sending unit/pump. I am working off of an Overkill gas tune that I had with a 3.4" pulley.
I have been reading a lot about tuning but I think I got in over my head too quickly. I have realized tuning is a true art form!!! I have read the 60# tuning method here and some of the other sites. I tried to follow the settings and the car ran either too rich or too lean. I found that 1.20 on the Flow rate got me close on my fuel trims. I have attached my most recent scan and tune for reference. Unfortunately, I am using the stock narrowband sensor so I know that I am limited. I know I need a wideband soon but I spent way more than I planned for this conversion and money is tight so I have to work with what I have now.
My question is can anyone point me in the right direction with this tune. I have changed the Injector Flow rate and subtracted timing from the knock that was in this attached scan. I just want to get it close so no damage is done until I better understand how to tune or pay someone to help me out.
Thanks for any insight
Rick