Did some WOT Logs-I think I have a fuel issue-help?
06-03-2006, 04:51 PM
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Did some WOT Logs-I think I have a fuel issue-help? Well I did some wot logs today and I think I have a fuel issue. Car is a 02 Z06, A&A P1SC kit 4.10 pulley, 317 heads milled to 69.5cc, 60lb Mototron inj, LPE pump. I did some WOT pulls and my AFR starts to creep up near the top of the pull. At 3000 rpm it drops to 11.47, then drops to around 11.09 at 5300 rpm then it starts to rise up from there to 12.0 at 6500 rpm. Tried this twice and increased my the #'s in the pe table but the results are similar. Inj duty cycle is only 80%. I don't have a fuel pressure guage since I have a wideband guage mounted in the pod. Do you think I need a "boost a pump"? I have my HPT logs if someone wants to see them. Also I noticed the car starts to pull timing if the IAT temps go over 100 degrees-I have no knock anywhere so do you think I can reduce the value at which the computer pulls timing based on IAT temps? Thanks in advance!
06-03-2006, 05:07 PM
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you might be running out of fuel pressure up top.
what is your current fuel setup?
I would leave the IAT pulling timing alone..for yr engine protection. find another way to get the timing back. IE...front mount...alcohol/water injection
what is your current fuel setup?
I would leave the IAT pulling timing alone..for yr engine protection. find another way to get the timing back. IE...front mount...alcohol/water injection
06-03-2006, 09:10 PM
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12 afr isnt too bad I have 60000 miles of hard driving at around that AFR.Whats the power doing up top?If its still increasing then youre prob not starving for fuel.also,you are a textbook candidate for water/alky injection for alot of reasons.also seeing youre fuel psi is pretty important right now.
06-03-2006, 09:18 PM
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Don't really want to do the Alky-the IAT temps rose after 3 back to back runs on the street. First 2 pulls the IAt only went up to 88 degrees. Don't have a clue what she makes for power as I haven't dyno'd it yet.