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Your stock front pump, if not in perfect shape, could be acting as a restriction for the 044. Those 044ís move a lot of fuel.

See if you can isolate if the cavitation noise is coming from the front or back pump. The front pump making noise may be debris in the tank strainer blocking flow, or a bad pump. Noise in the rear pump could be a front pump problem, or some other restriction between front and rear pumps.

Another long shot.......when the car is running measure the voltage at the battery, then at each pump and see if one has a big voltage drop. A big drop could be a bad pump pulling to much current, or bad wiring and/or relays not giving the pump the current it needs.
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Old 06-24-2018, 03:43 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #101 (permalink)
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What type of FPR do you have? Does your FPR have gauge. You should be able to visually see that pressure is set to 43 psi.
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1988 Porsche 930 Targa - 3.4L Twin Plug Motor, DC 13 Cams, Supertec Head Studs, ARP Rod Bolts, Port and Polished Heads, Garretson Andial Intercooler, GSX 61 BB Stage 5Turbo, Tial F46 WG .8 Bar Spring, PowerHaus Headers, Rarly8 Dual Tip Muffler, MS3 Pro EFI conversion, 57lbs. Cobra Injectors, Center Force Stage 2 Clutch , Rebuilt 4 Speed with LSD.
Old 06-25-2018, 04:09 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #102 (permalink)
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Quote:
Originally Posted by jpilcher View Post
What type of FPR do you have? Does your FPR have gauge. You should be able to visually see that pressure is set to 43 psi.
Hi John, I have a stock 964 regulator... no gauge. It's not that old, I'm surprised it has failed already. I added a gauge myself to the fuel line. Are you running a Aeromotive rising rate FPR ? Philip
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Old 06-25-2018, 04:32 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #103 (permalink)
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Quote:
Originally Posted by philip j View Post
Hi John, I have a stock 964 regulator... no gauge. It's not that old, I'm surprised it has failed already. I added a gauge myself to the fuel line. Are you running a Aeromotive rising rate FPR ? Philip
I am using Aeromotive, non rising rate.
The Aeromotive allows you to adjust the pressure manually. I have thought about installing a fuel pressure sensor, to datalog in Tunerstudio. PerfectTuning sells one. I am not sure that you would be able to adjust it through the software, unless you had a Electronic Controllor hook up to your fuel pump.
Old 06-25-2018, 05:12 AM
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I cant recall if starting with the 964 or 993 they increased static fuel pressure. This accomplishes a few things, better atomization, improved atomization at very short paulse widths, minimize fuel boiling situations.
Old 06-25-2018, 07:12 AM
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That is the correct pressure for the 964 fuel pressure regulator.

I'm running it as well as the factory fuel damper.
Old 06-25-2018, 07:39 AM
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Originally Posted by nocarrier View Post
That is the correct pressure for the 964 fuel pressure regulator.

I'm running it as well as the factory fuel damper.
So your running 59 PSI with you 964 regulator? I thought they were factory set at 43 PSI. Philip
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Old 06-26-2018, 04:03 AM
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Close enough, It is actually 58 psi. The 964 Fuel pressure regulator is set at 4 bar.
Old 06-26-2018, 07:33 AM
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FYI -- 964 regulators are now on the endangered species list. Not discontinued by Porsche/Bosch, but out of regular production so the price has doubled.
It's the most tidy install when using OEM fuel rails, but at the new price it's worth using an Aeromotive regulator and getting lines made with metric hose ends.
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Old 06-26-2018, 09:59 AM
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Yep. Iíd rather use a rebuildable FPR than OEM.

You can rebuild an Aeromotive for $15 as long as the housing and piston didnít suffer damage.
Old 06-26-2018, 10:11 AM
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Quote:
Originally Posted by nocarrier View Post
Close enough, It is actually 58 psi. The 964 Fuel pressure regulator is set at 4 bar.
OK, so I think my FPR is good... the pressure if a little bouncy between 50 - 60 psi occasionally. Is this something to be concerned about? Philip
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Old 06-26-2018, 02:02 PM
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Yup, fuel pressure must not fluctuate, this would alter afr. Focus on getting your pump(s) running with consistency.
Old 06-26-2018, 02:53 PM
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If you go into tuner studio and activate your fuel pump is the pressure stable with the pumps running or bouncy?
Old 06-26-2018, 03:59 PM
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Quote:
Originally Posted by nocarrier View Post
If you go into tuner studio and activate your fuel pump is the pressure stable with the pumps running or bouncy?
Thanks for the info... I'll check.
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Old 06-26-2018, 06:42 PM
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Had a tuner in to finish off my setup....
https://www.facebook.com/lighttouchtuning/photos/pcb.406851056477973/406850863144659/?type=3&theater
turns out I had my standalone map sensor configured wrong, hence giving me a headache with rich fueling problems, once corrected she runs great... still chasing a electrical draw causing new fuel pump to draw too much amperage. getting close ;-)
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Old 07-03-2018, 04:22 PM
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Quote:
Originally Posted by philip j View Post
Had a tuner in to finish off my setup....
https://www.facebook.com/lighttouchtuning/photos/pcb.406851056477973/406850863144659/?type=3&theater
turns out I had my standalone map sensor configured wrong, hence giving me a headache with rich fueling problems, once corrected she runs great... still chasing a electrical draw causing new fuel pump to draw too much amperage. getting close ;-)
I knew it would be something simple!
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Old 07-03-2018, 11:52 PM
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That's great news Phillip. Did the tuner setup base fuel and ignition maps for you?
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Old 07-04-2018, 03:57 AM
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Originally Posted by jpilcher View Post
That's great news Phillip. Did the tuner setup base fuel and ignition maps for you?
Hi John, yes the tuner set up all perimeters... still chasing a electrical gremlin though. Under load, at about 4K rpm, I'm showing 9 V at the battery? Started tearing into it last night. In test mode, front pump has 12V, and new 044 rear pump 10.66V no fluctuation in voltage, but rear pump sounds like its cavitating every few seconds... Philip
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Old 07-04-2018, 04:46 AM
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Originally Posted by philip j View Post
Hi John, yes the tuner set up all perimeters... still chasing a electrical gremlin though. Under load, at about 4K rpm, I'm showing 9 V at the battery? Started tearing into it last night. In test mode, front pump has 12V, and new 044 rear pump 10.66V no fluctuation in voltage, but rear pump sounds like its cavitating every few seconds... Philip
You could try running a new heavy gauge wire from relay to pump. There may be corrosion in the wire. Have you split the fuel pump fuses into 2 separate fuses? You could also do a resistance check on the 2 pumps and compare the values.
Old 07-04-2018, 05:18 AM
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Originally Posted by jpilcher View Post
You could try running a new heavy gauge wire from relay to pump. There may be corrosion in the wire. Have you split the fuel pump fuses into 2 separate fuses? You could also do a resistance check on the 2 pumps and compare the values.
Hey John, yes already split the fuel pumps/upgraded the fuses... depending what I find in the next couple of days, I might just upgrade the wiring, and run the front pump only, and have the ECU trigger a new relay for it... should still be plenty of fuel, and line size for 600 HP, and I don't think I'll be over that with the gt3582r. Any suggestion on what size wiring I could get away with if I go this route?
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Last edited by philip j; 07-04-2018 at 01:43 PM..
Old 07-04-2018, 01:41 PM
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