jason86/2.8

I was looking around on the site and saw that increasing the fuel pressure on a V8 from 42psi to 50 psi increased peak hp by about 15. I was wondering about the results it would have on the V6. Is the stock fp 42psi on the V6 too? And how would I go about upping the fp? Thanx in advance!

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1986 Berlinetta, 2.8L, newly rebuilt 700R4, 3.42 Posi. 129,000 miles and counting.
Wins:
1996 Mustang
1994ish Olds Acheiva

Losses:
1999 Grand Am SE
1996ish Honda Accord (twice)
1990ish Vette (never should have been dumb enough to race a vette in the V6)

JoeG-89RS

Not an answer but I once read that our fuel pressure regulatros couldn't be replaced as they were rivited on the fuel rail. But I was in the local pullit yardand found a frame rail with torx screws on the regulator. What gives? Can we put adjustabe regulators on?

FAST RS

I was thinking that exact same thing in class today i herd these 2 kids talkin about there truck and it was funny how thy r like ya a catback dosent do anything bla bla im jsut stinng there laffin to my self. But how would u be able to do that. And speaking of fuel Powerpullys And my msd 6AL made a big difference in gas milage ive gone from 220 miles per tank to 260 miles per tank and still have 2 gallons of gas left.

TomP

While the GM manual states that the v6 fuel pressure regulator is not servicable, according to someone I knew a while ago, it -is- replaceable, and the v8 TPI units can be put on.

The regulators are not riveted, they are attached using security screws, so called because a little pin sticks out of the center of each screw. These take a star-bit with a hole drilled in the center. You can either find a kit with those bits in it, or use a dremel to remove the center pin. I've heard of a hammer & punch being used to flatten the screws' pins, but that seems a bit harsh.

Yeah stock FP is 42, but that's at idle, and the computer can increase it/decrease it as it sees necessary.

I'll probably add an AFPR after I do headwork.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards

RenoLB8

If FP is computer copntrolled, couldn't a well programmed chip up it for you then? Also, I've seen AFPR's in the fierostore.com, so they must work on 2.8 MPFI's.

-Reno

TomP

Heh, I goofed a little bit.. the regulator is vaccumed control. I know the computer has a hand in the final fuel pressure, though. Maybe by controlling how long the injectors are open for? Or controlling how long the fuel pump stays on?


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards