[Shotimes] fuel pressure regulator and 255lph pump issue
Carl Prochilo
gr8sho@prochilo.myserver.org
Mon, 12 Sep 2005 21:45:31 -0400 (Eastern Daylight Time)
Interesting, I did not know this. Is there a write-up somewhere that
describes this system? From what I saw when I replaced my pump, it is
fairly low tech, but mine is a 92.
--
Cheers,
Carl Prochilo
92 Ultra Red Crimson
On Mon, September 12, 2005 6:49, Adam Parrott said:
> Something else to remember is that the '89-'90 cars have a factory
> installed
> 2-speed fuel pump system that is absent/disabled on the later ('91 and
> up)
> cars. Since this two-speed system runs at low speed (and thus low
> flow) at
> lower TPS voltages, the '89-'90 cars usually do not show the same
> over-pressurization problems with the 190lph and perhaps even the
> 'regular
> pressure' 255lph pumps.
>
> Adam
>
>
> ----- Original Message -----
> From: Bruce Malachuk
> To: 'Carl Prochilo' ; shotimes@autox.team.net
> Sent: Sunday, September 11, 2005 9:42 AM
> Subject: RE: [Shotimes] fuel pressure regulator and 255lph pump
> issue
>
>
> I've found that the 190lph won't always over run the stock FPR as a
> friend
> has one in his car and his fuel pressures are where they are
> supposed to
> be.
> FWIW I think the MTX SHO's got a 110lph, and a 155 is the next
> larger step
> that one can go to without running the possible risk of overrunning
> the
> stock FPR. I have read enough accounts of the 190 overrunning, but
> it seems
> it doesn't happen to everyone.
>
>
> Bruce J Malachuk
>
> * 94 Opal Frost MTX
> * 93 Emerald Green MTX - SOLD
> * 93 Black ATX - New Parts CAR
> * 95 Silver Frost ATX SE - SLO -Buyer waiting
> * 96 TR - Cam Failed parts car :-(
>
>
> -----Original Message-----
> From: shotimes-admin@autox.team.net
> [mailto:shotimes-admin@autox.team.net]
> On Behalf Of Carl Prochilo
> Sent: Saturday, September 10, 2005 9:23 PM
> To: shotimes@autox.team.net
> Subject: Re: [Shotimes] fuel pressure regulator and 255lph pump
> issue
>
> The stocker is not 155lph. If you were to buy that size pump from
> say
> apeusa.com, it would be considered an upgrade. This should be fine
> for a
> BOS upgraded SHO. Even the 190lph pump will overrun the FPR.
> --
> Cheers,
> Carl Prochilo
> 92 Ultra Red Crimson
>
> On Sat, September 10, 2005 21:08, Michael Tulloch said:
> > Hello All:
> >
> > I have been reading more and more of what I should have done
> before
> > replacing my fuel pump. I installed a 255lph walbro pump under
> the
> > suggestion I thought from here that the stock pump (155lph) wasn't
> > enough for WOT fuel rate. Now I'm reading more and more articles
> > stating the stock fuel pressure regulator can't handle the
> increased
> > pressure and will cause a lean-out at WOT through the ECU pulling
> > injector pulse width. The exact opposite of what I wanted. I've
> read
> > up on the SHONut fuel pressure regulator kit but not excited on
> buying
> > a $250 kit to fix a mis-directed replacement pump. Has anyone
> tried a
> > Holley
> > (HLY-512-503-5) or Accel ( ACC-74560) regs from Summitracing.com?
> >
> > Michael.
> >
> >
> >
> >
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