Fuel Pressure Too Low 50 PSI Static

[BennyH]

Just installed Autometer fuel pressure gauge inside the car.
vaccum pressure at 42 PSI
statics pressure at 50 PSI.
WTF, this is too low. Also, the new A/F meter indicated Lean when I am boosting.
This is not good.
Is there anyway I can dial up the pressure from the JR regulator?
Or could it be the Fuel filter clogged that cause this? (not likely, I changed it 35K miles ago and alwlays run AMOCO Gold 93 octane)

[Holden]

What car?

[Mr Rogers]

It is def. too low since you are using the crappy JR riser and especially since you aree showing lean when boosting. Raise it to 60 and see where the A/F is at after that. The pressures you described are one that we Teg guys see when using the Cartech FMU but we are normally seeing anywhere from 60-70 at static but can change the rise rate to each specific setup. You my friend are stuck with the same rise rate

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98 GS-scR w/ 8psi JRSC, Walbro HO fuel pump, AEM cai, DC 4-2-1 one peice header, Thermal Exhaust, Skunk Works cam gears, J&S safeguard, RC 310's, Cartech FMU, Vortech regulator, H&R sports and KYB AGX's, and of course to slow down, KVR X-drill F&R rotors and Carbon Kevlar pads and V1 to signal the slowing down and soon to go on the "Juice" and a CF diet.
Best et ==>13.6 @ 103mph w/ 2.3 60ft

[BennyH]

Holden,
The car is 95 GSR with the base 6PSI JRSC kit.
I just ordered a 255ltr/hr high pressure fuel pump. Hope it will be here next week.
I will order the Cartech 20005 from Jim next week when I am back home from my trip.
Happy Thanksgiving everybody and drive safe.
Ben

[JRCivic]

Benny,

Yes, your fuel pressure is too low. Loosen the 1/2" nut on top of the JR regulator, and using a 3/16" hex key, turn the adjustment screw clockwise (in) until the desired pressure is reached. 60 psi static is a real good starting place. Then tighten the jam nut... plug your vaccuum line back on to the JR FMU and you are done. Go test drive.



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'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph

[BennyH]

Jim,
Thanks for the advice on how to adjust the pressure on the JR FMU.
After I adjusted the static pressure to 60PSI. Fuel pressure with vaccum is still at 42PSI.
My fuel pressure is at an alarming low 69PSI when I am at 6PSI boost and the A/F gauge shown lean on boost.

I just installed Walbro High Pressure Fuel Pump last night.
The installation was relatively easy by following Greg Holden's instruction in his website. Thanks Greg!!!!!
Took the car out for a spin.
I finally can see 3 Green LED Rich on the A/F meter when I punch the gas pedal (Auto Meter Fuel Pressure Gauge shown a healthy 88 PSI). The car felt so much stronger than it used to. I can't help myself with grin
I strongly recommend all car with JRSC, even the base 6PSI kit, should upgrade the fuel pump. It is cheap insurance again running lean when your stock pump can not keep up at high fuel pressure.
I still have not decided on going with the Cartech FMU or wait for the Zdyne SECU to fine tune the fuel.
Thanks,
Ben
1995 6PSI JRSC GSR with BTC and 255ltr/hr High Pressure Fuel Pump.
PS. I noticed the pump was lounder than stock before I put the seat cushion on. However,after I put the seat cushion back on I did not notice the noise any more, it is as quiet as the stock pump.


[This message has been edited by BennyH (edited December 02, 2000).]

[This message has been edited by BennyH (edited December 02, 2000).]

[Holden]

I'm glad things worked out. Enjoy.

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Greg Holden
96 GSR, JSRC @6psi, AEM CAI/RSR 4-2-1/Greddy PE, Cartech 20005/Walbro GSS-342, KYB AGX/H&R OE Sport/ST 19mm Rear Swaybar
Best 1/4 ==> 13.937 @ 101.41mph
My JRSC Install Site