Tweaking adjustable fuel pressure regulator
#1
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What are u guys setting your fuel pressure at NA? I was told to set it at 58-60psi. Stock was 53 psi and vac referenced to 60 psi correct?
I was told to not run vacuum ref on na setup. But I done some reading tonight and it said adjust psi to your WOT A/F ratio. And let ECM relearn the drivability part. Is this correct?
I was told to not run vacuum ref on na setup. But I done some reading tonight and it said adjust psi to your WOT A/F ratio. And let ECM relearn the drivability part. Is this correct?
#4
TECH Senior Member
iTrader: (5)
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No, it is important to use a vac source regulator on all setups. When the engine is seeing vacuum, it literally sucks the fuel out of the injector. That is why it lowers the pressure at the rails to keep fuel flow linear. Just the opposite in boost. Boost pushes on the injector so the fuel pressure is raised at a 1:1 ratio to get the fuel injected properly into the runner.
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#8
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i have a aermomotive pressure gauge before one of the rails. It shows 53psi at idle and drops to around 45ish at around 2000rpm. Jumps to 58psi at WOT. I think its working. Only thing is the rich WOT a/f ratio. I think it was around 11.8 today. Was around 13.1 without vaccum. Should i just back the WOT pressure down some at regulator?