i was wondering what i should set my fuel pressure at when i purchase an adj. FPR valve in order to push the injectors to their SAFE potential? of course while i purchase this adj. FPR i will be installing a FMIC, so i'm hoping to push 12 psi with a higher fuel pressure setting, and a front mount. thanks for the help.
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Adjusting the fuel pressure with the stock FPR
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It's the fuel pump that will max out first; LONG before the fuel injectors will have issues from the raised pressure. With the walbro you don't want the total fuel pressure to exceed ~80-85PSI or you may experience issuesfrom the pressure bypass valve in the pump. To manage 12PSI intercooled on the stock turbo SAFELY you probably wont have to raise the fuel pressure nearly that much. Probably 6-8PSI over stock.
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umm.. what makes you feel that you need more fuel pressure for just 12psi?
I've been running about 13psi non-intercooled with 93octane and the timing backed off about 3 degrees for awhile now. I hear no pings, knocks and feel no hesitation or stummble under boost from detonation.
I also know a couple people who have been pushing 10+ non-intercooled for a much longer time than me!
Of course we're probably just lucky nothings blown up so far. :|
My point is that "in my opinion". 12 psi is just fine on the stock equipment if everything is in good condition. The only things I'd worry about are freeing up the intake and exhaust to get the most from raising the boost.
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when i first got my z the engine wasnt in great shape, but after repairing some basic stuff and tune up, etc. I ran 12-13 psi all day on high octane with no issues at all. all the mods at the time was an open exhaust, 3 inch downpipe and k&n cone filter.1984 300zx Ae Turbo(under repair...)
1989 240sx rb20(daily driver)
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well i've had a lot of bad luck with random shit breaking in my NA motors, so i'm really playing it safe with a turbo motor and trying to keep the heat down to a minimum. i wanted to get an adj. FPR anyways for the future, and the FMIC just always is a good idea...especially in this Texas heat. :wink:
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are you just planning on running the 12 psi or higher boost levels than that? Jason said if you get a walbro you can crank that sucker up to 80psi. however, keep in mind that ANY fuel pump you get, the more you crank the psi the less the pump will flow.
The walbro gss342 will flow 70gph at 40psi with a draw of 7.5 amps.
however at 80 psi it will only flow about 51-52 gph with a draw of 11.1 amps. these figures are at 13.5 volts.
You can get a walbro cheaper than a tt pump 99% of the time and the walbro is new and tried a and true. It is MORE than capable of handling 12 psi on a stock T-385 Z31 6.0 LSX turbo 766whp/792wtq
04 GTO, LS6, big cam, porting, N20... underway for summertime daily driver.
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Morgenstern wrote: well i really want to shoot for getting close to 450-500 whp, from around 22-26 PSI of boost, and other modifications to my heads, cams, etc.85 Z31 6.0 LSX turbo 766whp/792wtq
04 GTO, LS6, big cam, porting, N20... underway for summertime daily driver.
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cheezmonta wrote: umm.. what makes you feel that you need more fuel pressure for just 12psi?
I've been running about 13psi non-intercooled with 93octane and the timing backed off about 3 degrees for awhile now. I hear no pings, knocks and feel no hesitation or stummble under boost from detonation.
I also know a couple people who have been pushing 10+ non-intercooled for a much longer time than me!
Of course we're probably just lucky nothings blown up so far. :|
My point is that "in my opinion". 12 psi is just fine on the stock equipment if everything is in good condition. The only things I'd worry about are freeing up the intake and exhaust to get the most from raising the boost.
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