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Old 09-26-2007, 09:30 AM   #1
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Default new exhaust = boost creep = really high FP = fire?

So, when I install my downpipe, test pipe, and exhaust, from what I've read here it will cause hella boost creep, maybe into 7-8 psi range. ATM the car's running the "stock" Vortech 12:1, stock 1.6 injectors, 5 psi, and a 190HP.

Will hitting 7-8 psi cause a spike in fuel pressure bad enough to burst fuel lines and burn my **** to the ground? Wondering..

I have a PNP and 460s waiting to go on too, of course the obvious answer is just do that first.. but I'd like to get my car from Jacksonville, where it is now, to Augusta with the new exhaust on because there's nowhere else to put it for the trip but under the car where it belongs.
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Old 09-26-2007, 10:01 AM   #2
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you're fine. the greddy doesnt creep it spikes and drops fast. small spikes to 6-7-8psi wont cause it to run lean, you're fp/fmu combo will ensure it's ok.

fwiw, your fuel line should have a spike rating of 300psi or so. i used to run 110psi all day long. the chances are close to nil.
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Old 09-26-2007, 10:21 AM   #3
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+1 You should be fine.

At 8psi with the GReddy, I ran a Pierburg and BEGi AFPR with the 1.6 injectors without a problem. BUT...at the dyno did note that the 1.6 injectors were pretty much maxing out at ~8 psi b/c no matter how much more fuel I added I could not get the AFR any lower. As long as you are not staying at 8psi for extended periods, you should be fine. Hell, it'll be fun!
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Old 09-26-2007, 10:28 AM   #4
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if you're really worried, don't exceed 80% throttle
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Old 09-26-2007, 10:45 AM   #5
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Indeed. Thanks! Sounds like I'll be alright. I'll borrow dad's fire extinguisher for peace of mind.
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Old 09-26-2007, 12:13 PM   #6
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I agree with what has been said already, but as always when running higher fuel pressures ... take a good look at those lines and make sure the clamps are on and seated nicely. I personally changed to worm type clamps.
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Old 09-26-2007, 01:33 PM   #7
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use good fuel INJECTION hose. Mine was rated for 180psi working pressure and something like 900psi burst pressure. also use fuel injection clamps...t-bolt clamps.
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