85-86 Fuel Pressure Regulator output
07-03-2007, 05:53 AM
#1
Rennlist Member
Thread Starter
85-86 Fuel Pressure Regulator output
Anyone know the max output PSI that the 85-86 FPR will give? I know there is a PSI range from Idle to WOT, but I've never seen it. 
07-03-2007, 06:05 AM
#2
Rennlist Member
Hi Darien
Fuel pressure at idle approx 29psi.
Fuel pressure with engine stopped and fuel pump relay bridged 36psi +/- 3psi.
(be very careful to get the correct pins to bridge or you can damage the LH ECU)
Fuel pressure at idle approx 29psi.
Fuel pressure with engine stopped and fuel pump relay bridged 36psi +/- 3psi.
(be very careful to get the correct pins to bridge or you can damage the LH ECU)
07-03-2007, 02:02 PM
#3
Nordschleife Master
John I see about 31-32 PSI at idle (86.5 engine) and almost 40PSI when off
at idle I pull 23 in HG vacuum, with 13.4:1 AFR when warm, and 28 deg advance
at idle I pull 23 in HG vacuum, with 13.4:1 AFR when warm, and 28 deg advance
07-03-2007, 02:37 PM
#4
Rennlist Member
Originally Posted by Lizard931
John I see about 31-32 PSI at idle (86.5 engine) and almost 40PSI when off
at idle I pull 23 in HG vacuum, with 13.4:1 AFR when warm, and 28 deg advance
at idle I pull 23 in HG vacuum, with 13.4:1 AFR when warm, and 28 deg advance
Great to have your real world figures. I was just quoting from the WS manual...
The two sets tally pretty well :-)
Also thanks for the inlet in Hg figure - that's very useful as we are working on the SharkTuner for the EZF ignition ECU for the 85/86 cars. That unit contains a MAP sensor which determines igntion advance wrt inlet vaccuum.
07-03-2007, 04:32 PM
#7
Rennlist Member
Hello Darien,
It will run max fuel pressure with no vacuum (same as max load WOT).
So at idle, just pull off the vac feed to the FPR and you will have your answer.
It will run max fuel pressure with no vacuum (same as max load WOT).
So at idle, just pull off the vac feed to the FPR and you will have your answer.
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07-03-2007, 04:34 PM
#8
Rennlist Member
Originally Posted by IcemanG17
Darien
The 85-86.5 32V's run quite a bit lower pressures than the S4+.....kinda odd
The 85-86.5 32V's run quite a bit lower pressures than the S4+.....kinda odd
The S4 uses 19# injectors against the 24# used on the 85/86 cars.
They then needed to run higher than rated fuel pressure on the injectors because they could barely get them to support the power the later engine make.
Even then, S4/GT/GTS injectors are running at 100% at max power.
07-03-2007, 05:19 PM
#10
Rennlist Member
Only if they are going to increase the power output by more than a few %. The standard system is on its limit.
A RRFFR is a quick way to match a small increase in power - say with an X pipe.
A SharkTune session will get the best out of any 928.
A RRFFR is a quick way to match a small increase in power - say with an X pipe.
A SharkTune session will get the best out of any 928.
07-03-2007, 07:32 PM
#13
Nordschleife Master
Originally Posted by John Speake
OK Lizard,
Great to have your real world figures. I was just quoting from the WS manual...
The two sets tally pretty well :-)
Also thanks for the inlet in Hg figure - that's very useful as we are working on the SharkTuner for the EZF ignition ECU for the 85/86 cars. That unit contains a MAP sensor which determines igntion advance wrt inlet vaccuum.
Great to have your real world figures. I was just quoting from the WS manual...
The two sets tally pretty well :-)
Also thanks for the inlet in Hg figure - that's very useful as we are working on the SharkTuner for the EZF ignition ECU for the 85/86 cars. That unit contains a MAP sensor which determines igntion advance wrt inlet vaccuum.
John,
I havent had a chance to measure vacuum with the factory LH/EZF, as you can tell from my first post I am running the car with 28 deg of advance at idle, cant really do that with the stock computers.
07-04-2007, 03:01 AM
#14
Rennlist Member
Thread Starter
Is that WOT FP?
Still looking for someone that might know how much FP I could get with the stock FPR. If it's between 60-70, I'll be alright. I also have the 044 fuel pump installed, but I don't think that will change the end rsult?
Still looking for someone that might know how much FP I could get with the stock FPR. If it's between 60-70, I'll be alright. I also have the 044 fuel pump installed, but I don't think that will change the end rsult?
Originally Posted by goodspeed928
52 with X-pipe
07-04-2007, 05:44 AM
#15
Rennlist Member
Originally Posted by Darien Nunn
Is that WOT FP?
Still looking for someone that might know how much FP I could get with the stock FPR. If it's between 60-70, I'll be alright. I also have the 044 fuel pump installed, but I don't think that will change the end rsult?
Still looking for someone that might know how much FP I could get with the stock FPR. If it's between 60-70, I'll be alright. I also have the 044 fuel pump installed, but I don't think that will change the end rsult?
See post #7 - that answers what you need to know......