Lethal return fuel system 2.9 whipple issues.

mat50ho

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Out of curiosity how full is you gas tank. Mine just started acting up when it hit 1/2 tank....
 

Caleb Naasko

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Update: So with the frps back on, I did another pull and it went lean at 4800rpm again. I sent the datalog to my tuner (kevin), and he said something in the computer is commanding it to go lean at 4800.

We started off fresh with a new base tune, and I am now able to get the car wide open to redline with a good mid 11 a/f ratio! Very happy the pumps are fine.

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Fopar

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Ya... after I read your above post about 'targetted wrong A/F' sounds like your tuner doesn't know about adaptive learning.... I would find a new tuner :p
 

Caleb Naasko

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Ya... after I read your above post about 'targetted wrong A/F' sounds like your tuner doesn't know about adaptive learning.... I would find a new tuner :p
You must not know who Kevin Dunn is lmao. He was the first guy to tune a 03-04 Cobra on e85 back in like 2007 I believe. Highly reputable and a great tuner.

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