I've been trying to solve a WOT fuel delay for several months now. The car will hesitate when going on/off throttle on heavy loads (shifting quickly or in and out of throttle).
To give some background, I went ahead and deleted the PPRV. While in there, noticed one of the fuel pumps was cracked and leaking (glad this was caught), so replaced both pumps with Deutchworks 340 LPH pumps. Unfortunately, this didn't resolve the issue.
The car had an unknown tune from the previous owner, so went ahead and got a dyno tune partially to try to resolve the lingering WOT hesitation, and also for peace of mind. The tuner was able to see a drop in fuel pressure after a few pulls on the street, but wasn't able to resolve the issue in the tune. Ended up putting down 403hp/432tq on a 4wd mustang dyno.
Ultimately, he recommended two options:
1) Hard wire the pumps (I'd rather not do this).
2) Go to a return style fuel system.
I think a return style system is overkill given I'm just running a 2.81" upper pulley on the stock eaton along with a bigger heat exchanger, tb, plenum, catted x, and a cat back. Eventually I'd consider going to a Whipple or VMP, but I'd rather not modify the car anymore given it has 18k miles and is in mint condition.
I've read plenty of posts about the PPRV delete or a tune resolving this issue, but I can't seem to get rid of it. Any suggestions are greatly appreciated.
To give some background, I went ahead and deleted the PPRV. While in there, noticed one of the fuel pumps was cracked and leaking (glad this was caught), so replaced both pumps with Deutchworks 340 LPH pumps. Unfortunately, this didn't resolve the issue.
The car had an unknown tune from the previous owner, so went ahead and got a dyno tune partially to try to resolve the lingering WOT hesitation, and also for peace of mind. The tuner was able to see a drop in fuel pressure after a few pulls on the street, but wasn't able to resolve the issue in the tune. Ended up putting down 403hp/432tq on a 4wd mustang dyno.
Ultimately, he recommended two options:
1) Hard wire the pumps (I'd rather not do this).
2) Go to a return style fuel system.
I think a return style system is overkill given I'm just running a 2.81" upper pulley on the stock eaton along with a bigger heat exchanger, tb, plenum, catted x, and a cat back. Eventually I'd consider going to a Whipple or VMP, but I'd rather not modify the car anymore given it has 18k miles and is in mint condition.
I've read plenty of posts about the PPRV delete or a tune resolving this issue, but I can't seem to get rid of it. Any suggestions are greatly appreciated.