FiTech EFI Tuning Forum

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off idle to WOT stumble

New set up dual quads on 5.7 hemi, stock but for a .528 lift comp cam  216@50 duration. vacuum is around 12. The AFR is 14. 59 psi on fuel, I am using the Fitech in line fuel pump .I have about 10 miles on the setup. When I go to WOT off idle it hesitates. I have bumped the Accel pump all the way up to 70 seems better but still not corrected. Ideas?

Accel or Fast Accel?  What is your AFR doing when you throttle it, lean or rich?  Datalog?

I typically don't recommend hard throttle or full throttle in the early stages.  Many parameters that need to be fine tuned before.

Send me a datalog of 30 second idle.  Paste Dropbox or cloud link here.  What is your cam setting?  I am going to suggest cam 1.

Sorry, cam 2.