Fuel pressure spiking- turbo car
06-09-2014, 10:11 AM
#1
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Fuel pressure spiking- turbo car The car when idling is fine, its around 50 but when i go WOT it jumps up to 70-90 and the car bogs down like crazy. The AFR goes way down (already pretty car down since its a turbo car) but it goes well down into 10s. I just replaced the regulator but that didnt help, im guessing the only thing it could be is the pump. The pump does make a weird noise on WOT kinda like a whine. The system is walbro 255 with boosta pump, stock regulator/lines and 60lb injectors
06-09-2014, 10:31 AM
#2
The car when idling is fine, its around 50 but when i go WOT it jumps up to 70-90 and the car bogs down like crazy. The AFR goes way down (already pretty car down since its a turbo car) but it goes well down into 10s. I just replaced the regulator but that didnt help, im guessing the only thing it could be is the pump. The pump does make a weird noise on WOT kinda like a whine. The system is walbro 255 with boosta pump, stock regulator/lines and 60lb injectors
Vac/boost referenced 1:1?
Why the boosta pump (whatever the hell that is)
06-09-2014, 02:16 PM
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This is the kit i have, idk what exactly it does
06-09-2014, 02:55 PM
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http://www.racetronix.biz/itemdesc.a...WH-003&eq=&Tp=
This is the kit i have, idk what exactly it does
This is the kit i have, idk what exactly it does
I would look at replacing the FPR.
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06-09-2014, 04:52 PM
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what kind of boost numbers are you running?
the supply pump would only cause a problem if the return is to small and cant bleed off enough fuel. also you really should get a fpr thats setup to go 1:1 with boost. because more than likely the stock fpr is sticking shut when boost is hitting it.
the supply pump would only cause a problem if the return is to small and cant bleed off enough fuel. also you really should get a fpr thats setup to go 1:1 with boost. because more than likely the stock fpr is sticking shut when boost is hitting it.
06-10-2014, 08:31 AM
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what kind of boost numbers are you running?
the supply pump would only cause a problem if the return is to small and cant bleed off enough fuel. also you really should get a fpr thats setup to go 1:1 with boost. because more than likely the stock fpr is sticking shut when boost is hitting it.
the supply pump would only cause a problem if the return is to small and cant bleed off enough fuel. also you really should get a fpr thats setup to go 1:1 with boost. because more than likely the stock fpr is sticking shut when boost is hitting it.
06-10-2014, 09:56 AM
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what kind of boost numbers are you running?
the supply pump would only cause a problem if the return is to small and cant bleed off enough fuel. also you really should get a fpr thats setup to go 1:1 with boost. because more than likely the stock fpr is sticking shut when boost is hitting it.
the supply pump would only cause a problem if the return is to small and cant bleed off enough fuel. also you really should get a fpr thats setup to go 1:1 with boost. because more than likely the stock fpr is sticking shut when boost is hitting it.
06-10-2014, 11:42 AM
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Im running 8lbs for the most part, its tuned to only like 440whp. but it was tuned on the stock fpr, so i wouldnt think that i should put an aftermarket one on? but obviously im not sure of anything, the pump does should like its working extra hard, like you can hear the whine right there with the turbo almost but only when the guage reads like 100 psi for fuel(WOT), its not all the time
06-10-2014, 12:48 PM
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Interesting ...Ive witnessesd and ran stock fpr's on setup's running 12+psi. Also, the stock FPR is 1:1. Not saying this is your issue but im not a fan of the LT1 specific Aeromotive peices.
06-10-2014, 03:18 PM
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My thing is that it ran perfect with the stock one, was tuned with the stock one, so replacing it with a stock one should be ok to do. I dont see why the fpr would randomly stop working on my system, other than if it was malfunctioning, this is why i am hesitant to buy another one.
Sorry my tuner said it should be 1:1, i figured since he tuned it he knew that the fuel was doing. But regardless, tell me what you think about my previous paragraph.
Sorry my tuner said it should be 1:1, i figured since he tuned it he knew that the fuel was doing. But regardless, tell me what you think about my previous paragraph.
06-11-2014, 07:26 AM
#17
Can you put say 10psi on the regulator from shop air and see if it spikes the fuel pressure?
I would doubt its the pump, if the regulator was working fine it should bleed off the pressure and the pump may live a short life but you should have huge spikes. The lines are fine, I run a much larger pump and stock lines with no spikes.
Really not much else that would cause it here..
I would doubt its the pump, if the regulator was working fine it should bleed off the pressure and the pump may live a short life but you should have huge spikes. The lines are fine, I run a much larger pump and stock lines with no spikes.
Really not much else that would cause it here..
06-11-2014, 10:30 AM
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Can you put say 10psi on the regulator from shop air and see if it spikes the fuel pressure?
I would doubt its the pump, if the regulator was working fine it should bleed off the pressure and the pump may live a short life but you should have huge spikes. The lines are fine, I run a much larger pump and stock lines with no spikes.
Really not much else that would cause it here..
I would doubt its the pump, if the regulator was working fine it should bleed off the pressure and the pump may live a short life but you should have huge spikes. The lines are fine, I run a much larger pump and stock lines with no spikes.
Really not much else that would cause it here..