Fuel Pressure WAY too high!!
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Fuel Pressure WAY too high!!
Aight...heres my set up.
Stock turbo (with upgraded wastegate, bov etc.) S5 Motor, upgraded exhaust, intake, intercooler...a few other things, 4x720cc injectors, and a fuel pump from a Supra TT (just installed today...pump from FD wasn't delivering enough fuel). I also have a rechipped stock (n374) ecu with an e-manage (blue) attatched.
Right now the car is running exceptionally rich (9-10 afr) and the fuel pressure has my 100psi fuel pressure gauge pegged (i.e. fuel pressure is over 100 psi at idle)
Here's the question... Can the E-manage be adjusted to lower the massive fuel pressure coming from the upgraded pump or should I invest in an after market FPR?
Thanx!
btw... I am aware that a higher flow fuel pump shouldn't increase pressure but ...what would have?(maybe I can find the culprit and not have to get an FPR (right away)
Stock turbo (with upgraded wastegate, bov etc.) S5 Motor, upgraded exhaust, intake, intercooler...a few other things, 4x720cc injectors, and a fuel pump from a Supra TT (just installed today...pump from FD wasn't delivering enough fuel). I also have a rechipped stock (n374) ecu with an e-manage (blue) attatched.
Right now the car is running exceptionally rich (9-10 afr) and the fuel pressure has my 100psi fuel pressure gauge pegged (i.e. fuel pressure is over 100 psi at idle)
Here's the question... Can the E-manage be adjusted to lower the massive fuel pressure coming from the upgraded pump or should I invest in an after market FPR?
Thanx!
btw... I am aware that a higher flow fuel pump shouldn't increase pressure but ...what would have?(maybe I can find the culprit and not have to get an FPR (right away)
Last edited by 12RotorMonster; 11-11-07 at 02:19 PM.
#4
its best to change to an aftermarket FPR when you upgrade the pump. Not only will it let you eliminate the PD, it also lets you adjust fuel pressure to what ever you want.
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Alright so I checked the vacuum. Thats all fine and dandy. I'm gonna check for a clog in the return line (though I doubt it since fuel was flowing normal with the old pump). Looks like I have no choice in the matter. I will have to get an Aftermarket FPR. Oh well it's better that way anyway (it's just a cost I was hoping to avoid for a while). Big Thanks to Macs and Ronin!!!
#6
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There is no way the car would idle with 100psi of fuel pressure at idle speeds.
Either you'd be getting like 3x more fuel that you need, or the fuel injectors would lock up from that kinda fuel rail pressures...
Get another gauge.
-Ted
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I am aware that a higher flow fuel pump shouldn't increase pressure but ...what would have?
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Aftermarket FPR fixed it!!
nope all grounds were good.
I did have to replace my fuel injector seals and the electricalplugs for my primary injectors (the enormously high pressure actually blew them apart luckily I have a few extra harnesses sitting around). I'll have to post pics when I get a chance.
Umm.... just a quick note to RETed...Autometer doesn't make "piece of **** fuel pressure gauges" that are "BAD"....and at $200 a pop they better not be.
Thanks for all your help guys!!
nope all grounds were good.
I did have to replace my fuel injector seals and the electricalplugs for my primary injectors (the enormously high pressure actually blew them apart luckily I have a few extra harnesses sitting around). I'll have to post pics when I get a chance.
Umm.... just a quick note to RETed...Autometer doesn't make "piece of **** fuel pressure gauges" that are "BAD"....and at $200 a pop they better not be.
Thanks for all your help guys!!
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so heres a few pics of one of the electrical plugs (the other one was actually in worse shape but I can't find it...probably in the driveway or something. Anyway you get the point well enough from the pics.
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Anyway, the new FPR is in place and gauge reads 40 psi at idle and I'm back in action.
Again, to those that were helpful, Thank You very much!
#16
I wish I was driving!
But hey, NASCAR, NHRA, ALMS, and Motor trend all run them, so they must be the best, right? I mean, corporate sponsorship BY Autometer could have nothing to do with it, right?
After all, Ferrari, Lamborghini, Porsche, Saleen, and McLaren all sub out their gauges to Autometer for their world class supercars since they know their customers want the BEST, right?
Multimillion dollar F1 teams, the most advanced racing cars built on the planet, demand that their chassis' are equipped with Autometer gauges, because nothing beats Autometer.
And, of course, the best, and most accurate gauges, with today's sophisticated technology, are available for an amazing price of $50!
Don't buy into manufacturers' advertising.
#17
rotorhead
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Aftermarket FPR fixed it!!
nope all grounds were good.
I did have to replace my fuel injector seals and the electricalplugs for my primary injectors (the enormously high pressure actually blew them apart luckily I have a few extra harnesses sitting around). I'll have to post pics when I get a chance.
Umm.... just a quick note to RETed...Autometer doesn't make "piece of **** fuel pressure gauges" that are "BAD"....and at $200 a pop they better not be.
Thanks for all your help guys!!
nope all grounds were good.
I did have to replace my fuel injector seals and the electricalplugs for my primary injectors (the enormously high pressure actually blew them apart luckily I have a few extra harnesses sitting around). I'll have to post pics when I get a chance.
Umm.... just a quick note to RETed...Autometer doesn't make "piece of **** fuel pressure gauges" that are "BAD"....and at $200 a pop they better not be.
Thanks for all your help guys!!
Autometer definately makes some junk, at least some of their stuff. My oil pressure sending unit went bad.
But give them a break. Autometer boost gauges come stock in SRT-4's.
#18
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Can you show me references to where all those "organizations" explicitly claim Autometer is the best?
I would like to read up on it myself!
Personally, I normally run all Japan stuff.
But that's just me...
"Best" to me is one MoTeC ADL with lab-grade sensors.
The ADL can be programmed to any sensor characteristic you can throw at it.
If we're talking about stand-alone gauges, try looking up SpA gauges...
$200 Autometer fuel pressure gauge?
If this is the unit that uses the pressure tranducer, then I'll give you a little credit.
The sensor is already half the cost of the "gauge" itself, and it's not your typical changing resistance pressure sensor.
Although I would still not run one of these in my car...
-Ted
#21
rotorhead
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honestly, it's way better than what passes for typical boost gauges on most cars. DSM's for example are horrible (although they just estimate boost they don't actually measure it) and so are 3000GT/Stealth's
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