[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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