Fuel pressure
- Thread starter max9650
- Start date
I dont know i assume the person who installled the FPR before i owned the car - it had some problems , loss of power and not wanting to rev over 5k, so i turned down it down to 45 and it seems to hopfully have solved it but it did develop over night so i dont know how its raised to 65psi or if it was always that high
dark_knight
Member +
i'd throw my suspicions on a dodgy FPR, perhaps it has a mind of its own adjusting fuel pressure as it pleases.. 
i'd throw my suspicions on a dodgy FPR, perhaps it has a mind of its own adjusting fuel pressure as it pleases..
im thinking the same mate here is a pic of it,
Was prob made at toys r us, im going to get another fuel pressure check done monday see if its adjusted itself again cause i think it may have lol
dark_knight
Member +
i also noticed it's on the throttle plate side of the manifold and not the ICV side.. interesting..
lol at 'made at toysRus'..
lol at 'made at toysRus'..
dark_knight
Member +
Afr
@ max9650: do you know anything about AFR, air-fuel ratios..? that would be a good place to start..
@ max9650: do you know anything about AFR, air-fuel ratios..? that would be a good place to start..
@ max9650: do you know anything about AFR, air-fuel ratios..? that would be a good place to start..
yes i do know about AFR
Jay
Admin
By adjusting your fuel pressure you are changing your AFR's. Incorrect AFR's will affect engine performance and reliability. A wideband will measure your AFR's. If you don't know your AFR's you're flying blind.
Best to tune it with a wideband otherwise bad things can happen. Any local rolling road/tuner should be able to help you out bro.
Jay
Best to tune it with a wideband otherwise bad things can happen. Any local rolling road/tuner should be able to help you out bro.
Jay
dark_knight
Member +
narrow- versus wideband
@ max9650: ok then mate. so AFR is theoretically calculated by readings from the exhaust mixture. wideband AFR systems take their readings based on a 0~5v fluctuation while narrowband take theirs from a 0~1v reading. wideband is thus more accurate. you follow so far..?
most if not all OEM applications feed the ECU with narrowband readings for the ECU to calculate fueling based on that..
@ max9650: ok then mate. so AFR is theoretically calculated by readings from the exhaust mixture. wideband AFR systems take their readings based on a 0~5v fluctuation while narrowband take theirs from a 0~1v reading. wideband is thus more accurate. you follow so far..?
most if not all OEM applications feed the ECU with narrowband readings for the ECU to calculate fueling based on that..
Texx
Super Moderator
Personally I would fit a stock FPR and throw that Mickey Mouse adjustable crap in the bin. When running 0.8bar or less you don't need an adjustable fuel pressure regulator.
Chances are though, if you've got an adjustable FPR, you'll probably also have a fuel cut defender wired into the ECU somewhere.
Chances are though, if you've got an adjustable FPR, you'll probably also have a fuel cut defender wired into the ECU somewhere.
Jay
Admin
Any local tuner will have their own so you'll only need to pay for their time/effort. This can be as little as £20 which is far less expensive than buying a gauge.
