Stock FPR
I am wondering if I can leave the fpr connected to vacuum with my turbo on the car. It's at around 5 psi and the previous owner unplugged the regulator and left it open to atmospheric pressure. If I reintroduce it to a vacuum line and go into boost will the fpr be able to handle it? I've heard of diaphragms going crappy under boost and don't want that to happen.
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Shouldn't be a problem.
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oh btw it's a 1.6L with 209 000 km or 130 000 mi
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The fuel pressure regulator works to maintain a certain fuel pressure relative to manifold pressure. Flow is based on deltaP. It seems to me that by removing it's vacuum/pressure signal, it can no longer function as intended. I haven't heard of positive pressure being a problem for the FPR. Maybe somebody with more experience will chime in.
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well when removing vacuum and submitting it to atmospheric pressure it's basically like simulating WOT or wide open throttle to the regulator.
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Originally Posted by momo182
(Post 238450)
well when removing vacuum and submitting it to atmospheric pressure it's basically like simulating WOT or wide open throttle to the regulator.
For a turbo car, WOT is generally not 0 psig, but rather whatever boost pressure you are running. I suppose this all doesn't matter much if you have a standalone ECU because you can just tune the fuel map to compensate for the different fuel pressure. |
The stock fpr acts like a 1:1 fmu under boost.
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Wait... The previous owner disconnected the vacuum line to the stock FPR? Reconnect that bitch! The stock FPR's job is to maintain a constant pressure differential across the injectors. It has no problem at all with seeing boost.
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Originally Posted by Joe Perez
(Post 238484)
It has no problem at all with seeing boost.
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Mine is living a happy life at 12 psi... don't see a reason why 5 psi would bother one.
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Had one crap out at 10 psi a couple of years back. Probably unrelated to boost, but it did have 200K miles on it.
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I know someone that had the FPR go bad on a non-boosted 97. Drove him nuts trying to find the problem since no one though of the FPR on a NA car.
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Originally Posted by 04 Miata
(Post 238555)
I know someone that had the FPR go bad on a non-boosted 97. Drove him nuts trying to find the problem since no one though of the FPR on a NA car.
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I know someone that had the FPR go bad on a non-boosted 97. Drove him nuts trying to find the problem since no one though of the FPR on a NA car. Funny... that's one of the first things I usually check. I had 2 go bad on my cavalier, 1 on my brothers camaro, and 1 on the wife's taurus. I always suspect the FPR first. |
IIRC this guy had bad idle, a stumble on acceleration and bad fuel mileage.
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Back from the death:
On 1.8s there is an actuator between the FPR signal line and the intake manifold. What does everyone do on a MSPNP boosted car? Just remove it and connect FPR to intake manifold directly? |
Just install a one way valve, whatever it is called. I got gazillions of those everytime I go to the junkyard I grab a handful from turbo Volvos, Saabs, RX7s.
In fact back from the dead. |
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