[Shotimes] fuel pressure regulator and 255lph pump issue

[Adam Parrott]

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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