Fuel Pressure Drop at WOT
 

Been searching, and have determined my search skills are not clever enough.

I have the Racetronix fuel pump, PnP wiring kit, SVO 42's, stock fuel rail ('00 Fbod), and new fuel filter 5k miles ago.

Installed a fuel pressure sending unit to log fuel pressure in EFILive. At non-WOT conditions I have a pretty steady 63psi, at WOT, it drops as low as 52psi, get a spike to 72 psi if I drop TPS to 0%, or a gradual increase back to 62psi if I let off TPS gradually.

At WOT injector duty cycle is 66% and injector pulse width is 12.451ms.

I was expecting some drop at WOT (3-5 psi), but was suprised to see an 11 psi drop. If this is normal, cool, if not, any ideas of the cause?

As long as your AF ratio was tuned for it you're fine. In a perfect world it would hold your base pressure. You could always add a boost a pump later if you add more hp.

I agree with onfire, but it sounds like your pump isn't keeping up with your power level.

Might be an issue with the racetronix pump too, you certainly wouldn't be the first person to have an issue with one.

10-4

I'll double check the wiring this weekend and, if necessary, start looking for a bigger pump.