Safe boost to run?
#1
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Location: Connecticut
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Safe boost to run?
Hey, i am kinda new to this fourm i just recently purchased an 88 RX-7 10th Anniv i am wonder how much boost i can run safely without having the car lean out. I heard 7 psi was safe. If anyone could also tell me when fuel cut of is i would apreciate it. Thanks
#2
knowledge junkie
The OEM computer cuts boost above 8PSI I think. Adding the "defeaters & defenders" will help with that, as will a boost controller.
I wouldn't push 15% over the stock HP though without an aftermarket computer, fuel deliever upgrades, etc..
Although the car's designed for 350+ HP though Drivetrain & engine can take it so long as you do it right.
I wouldn't push 15% over the stock HP though without an aftermarket computer, fuel deliever upgrades, etc..
Although the car's designed for 350+ HP though Drivetrain & engine can take it so long as you do it right.
#4
7psi is fine. I am running 11psi with stock pump, injectors and a SAFC I wont run much more.
I have seen the stock turbo take over 20+ with out failure but this was with a ton of fuel, and it is not reccomended.
I have seen the stock turbo take over 20+ with out failure but this was with a ton of fuel, and it is not reccomended.
#5
Lives on the Forum
Rewire fuel pump power wire - this is good up to 10psi.
If you're running higher boost, you'll need an FCD, or you'll end up banging into the overboost fue-cut.
-Ted
If you're running higher boost, you'll need an FCD, or you'll end up banging into the overboost fue-cut.
-Ted
#6
Do it right, do it once
iTrader: (30)
I measured the voltage at my fuel pump with and without the headlights on, IIRC it was 11.9-11.6V. I added an FD fuel pump (don't think I needed it) and the voltage was about 11.6-11.3V. I'd check the voltage at the pump while the car is driving to be sure you need to rewire first. I think rewiring might get you up to 13V though. Instead of rewiring I used a wideband to check a/f ratios.
With a cone filter intake, RB FCD and a full exhaust I could run the car up to about 9.5-10 psi and have ~11.5 a/f ratio. Tested this with a FJO wideband. Also tinkered around with running a little with running more boost as the result of boost creep, a/f ratio got to 12.6 and I lifted, I think that was 11-12 psi boost.
Jeff
87 TII 13.42@104-105
93 R1 13.59@102.85
With a cone filter intake, RB FCD and a full exhaust I could run the car up to about 9.5-10 psi and have ~11.5 a/f ratio. Tested this with a FJO wideband. Also tinkered around with running a little with running more boost as the result of boost creep, a/f ratio got to 12.6 and I lifted, I think that was 11-12 psi boost.
Jeff
87 TII 13.42@104-105
93 R1 13.59@102.85
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