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DarkHorse
 Post subject: fuel pressure regulator
PostPosted: Thu Sep 30, 2004 9:28 pm 
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well, on a whim, i picked up a fuel pressure regulator from a twin cam 1.8, i.e. a 4g67, and it fit on the 4g15 8-valve fuel rail without modifications. straigh bolt-on.

now my question, what advantages or disadvantages could this possibly have/



`joe

my keyboard is broke, so the slash is actually a question mark. live with it. stupid shift buttons...
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xlr8
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PostPosted: Thu Sep 30, 2004 10:24 pm 
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They are probably the same part. Given the FPR was in good condition then there would be no difference as they perform the same function and in the same way on just about any EFI engine.
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socrateez
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PostPosted: Thu Sep 30, 2004 11:03 pm 
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The stock fpr from the 4g15 provides the highest pressure of all the fprs.

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04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t
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pony
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PostPosted: Sat Oct 16, 2004 3:47 pm 
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where that FPR is located? can it be adjusted somehow :-?

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socrateez
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PostPosted: Sat Oct 16, 2004 6:48 pm 
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where that FPR is located? can it be adjusted somehow :-?
The FPR is located on the end of the fuel rail at the opposite end from where the fuel line attaches. It has a return line to the gas tank and a vacuum line which controls the regulator. It has no adjustment of its own. You can increase fuel pressure by restricting the vacuum line, or restricting the return line. I believe withe vacuum line removed, the 4g15's FPR maintains pressure at 56psi. 46psi with the line attached.

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04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t
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pony
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PostPosted: Sun Oct 17, 2004 3:33 am 
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hmm.. so it´s simple: just plug the vacuum line and thats it?

but what this means? (read in somesort manual for my 4G15)

Rough idle or engine stalls --> cause of that --> Vacuum hose disconnected or damaged

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pony
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PostPosted: Sun Oct 17, 2004 9:17 am 
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i take that hose what goes to the intake manifold and cut it two pieces and seal it.. it works fine but i haven´t notice anything :lol:

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xlr8
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PostPosted: Sun Oct 17, 2004 11:13 pm 
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IMO removing the vac line is worthless. The whole idea of the vac line to FPR is so that fuel pressure remains constant relative to manifold pressure. Removing the vac line will mean you get higher fuel pressure (and hence richer mixtures) at idle and low load condtions (where you dont want the extra fuel) and the fuel pressure will be exactly the same as it was before at WOT (where you do want it).

Your only going backwards.
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pony
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PostPosted: Mon Oct 18, 2004 2:52 am 
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I agree xlr8.

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DarkHorse
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PostPosted: Mon Oct 18, 2004 7:28 pm 
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hmm, informative post afterall. thanks people.
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socrateez
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PostPosted: Wed Oct 20, 2004 10:19 pm 
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Quote:
IMO removing the vac line is worthless. The whole idea of the vac line to FPR is so that fuel pressure remains constant relative to manifold pressure. Removing the vac line will mean you get higher fuel pressure (and hence richer mixtures) at idle and low load condtions (where you dont want the extra fuel) and the fuel pressure will be exactly the same as it was before at WOT (where you do want it).

Your only going backwards.

8) Yup! Rising rate FPR is the route to go. They are quite expensive though.

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04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t
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JMirage
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PostPosted: Thu Oct 21, 2004 1:40 am 
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So can we use this with the 61t??

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1989 Mirage Turbo 4g63T w/ small 16g just bolted in so far.
LSD, 1g flywheel/clutch.
1989 Colt GT 4g61T (63T build in progress)
1g ECU, Injectors, Exhaust manifold, 16g evo III Turbo, SMIC, and C Exhaust cam -9*
K&N Air filter, airbox cut up, MSD plug wires, NGKs, Apexi S-AFC II, MAF translator, tubular o2 housing w/ dump tube, Full 3" mandral.

Now I ran out of fuel!!
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DarkHorse
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PostPosted: Thu Oct 21, 2004 10:56 pm 
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you mean a 1.5 FPR on a 1.6T? hmmm

EDIT: damn that sentence was short!

~joe


Last edited by DarkHorse on Fri Oct 22, 2004 12:39 am, edited 1 time in total.

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socrateez
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PostPosted: Thu Oct 21, 2004 10:58 pm 
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Quote:
you mean a 1.5 FPR on a 1.6T? hmmm
Slightly higher fuel pressure! I dont know if it will make a noticeable difference, but with mods and the abscence of any other fuel control system, its your cheapest best bet.
Damn that sentence was long! :wink:

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http://members.cardomain.com/socrateez
04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t
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JMirage
 Post subject:
PostPosted: Fri Oct 22, 2004 8:55 pm 
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I have an extra one, so I'll have to try it. My only problem is that I am OUT OF FUEL right now. My injector duty cycle has hit 102%. How that's possible I don't know, but I guess it cuts into the dead time of the next cycle. So if my fuel pump can supply enough, this may work to reduce the duty cycle. How many lph is the stock pump in our cars??

_________________
1989 Mirage Turbo 4g63T w/ small 16g just bolted in so far.
LSD, 1g flywheel/clutch.
1989 Colt GT 4g61T (63T build in progress)
1g ECU, Injectors, Exhaust manifold, 16g evo III Turbo, SMIC, and C Exhaust cam -9*
K&N Air filter, airbox cut up, MSD plug wires, NGKs, Apexi S-AFC II, MAF translator, tubular o2 housing w/ dump tube, Full 3" mandral.

Now I ran out of fuel!!
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