[Shotimes] fuel pressure regulator and 255lph pump issue

[Ian Fisher]

Zach
I am running a 190 at this time. I purchased a 155 to
drop in. I figured that it was cheaper than getting an
adjustable FPR. Plus with my hole in the floor, I can
swap it out in 10 minutes. Of course I bought it
months ago and never did swap it out...

I'm going to roll with the 3.2 for awhile. However, I
wouldn't mind doing a low boost FPS style setup in a
few years if I get another daily driver. At that time,
I'll get the larger pump, injectors, adjustable FPR,
etc. With a BOS 3.2/cams, I don't see the need for
much more than 155. :)

By the way, my 3.0 should be the poster child for oil
consumption. I'm trying to pull it before it gets dark
but that's not going to happen. I removed the spark
plug wires but the wells were swimming in oil. I cut
the ends off of the wires and reinstalled them to act
as plugs. I didn't want the oil running all over the
place when I hoisted the motor. Yup, they're that bad.

Ian "I am taking a dislike to the 13mm rear wiring
harness bracket bolts on the driver's side of the rear
head" Fisher



--- Zach Leahy <leahyz@gmail.com> wrote:

> I have a real time Fuel Pressure gauge, a 190 lph,
> and a stock regulator.
>  The low load (high vacuum), low pressures are too
> high. I am only seeing
> about 35-36 psi at 25 in Hg Vacuum (about 12.5 psi
> vacuum). Basically I am
> seeing too high of pressure in high vacuum
> conditions, but seeing a nice
> 39psi at zero vacuum. Seems to me that the 190lph is
> being overrun. Unless
> you are making upwards of 300hp at the crank, a
> 155lph should suffice. I
> didn't know that I was having this effect until
> recently amd was very
> intigued to find my car effected by it.
>  Seems like both of the regulators you posted are
> around $90 with no
> fittings. Why don't you just take the 255lph pump
> out and put a reasonably
> sized one in instead for less money (by the time
> youadd fittings, hoses etc,
> you wil be over the price of a new pump). Plus you
> won't have to figure out
> new technology. Just my .02. If you really need the
> capacity of the 255lph
> unit (blower, NO2 etc) you would need larger
> injectors, and just figure that
> you will need a better regulator. I have cheated a
> bit for now and used the
> tweecer to richen up the top end to compensate. WBO2
> is showing about 13.5:1
> at high RPM WOT.
>  I am working on slowly turning my car into a blower
> car, and the next part
> of the upgrade is the fuel system and I realize I
> will need to have the
> rails machined, larger injectors, a new FPR, and a
> larger capacity pump. I
> have been looking at these issues a lot in general.
>   Z
> 
> 
> On 9/10/05, Michael Tulloch
> <teach200513760@yahoo.com> wrote:
> >
> > 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 <http://Summitracing.com>?
> >
> > Michael.
> >
> >
> >
> >
> >
>
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