Mr. CarbTune's Garage - Accelerator Pump Tuning

[drift510ss]

I have a question, I have a 390cfm Holley on my car, when I'm at a stop and with the clutch in I can rev it as hard as I want, I can have it at idle and push it to the floor and it will shoot up in rpm. BUT when I'm driving and punch it to the floor it starts piping and missing..

I have to just Feather it...

Any reason why?

Thanks

[nightmathzombieethan]

If my pump is delivering too much fuel, It would only have a momentary effect right? I.E. It should actually bog down when I apply full throttle? What would it mean if you get "run on" when using full throttle? If I apply more than 3/4 throttle, then go to shift, my RPM's actually spike for a second during the gear change, despite having my foot off the gas for that moment. I thought it was my accel.pump but now I'm thinking I was wrong....

[FiveIronFrenzyFK]

Thanks for making the great quality information

[jizo30]

I've had hesitation issues with holley carbs for a long time, and I've tried different cams and adjustments, never worked,,,till I installed the 50cc pump,,,, then all the issues went away!

[garys737]

Why a broad?????