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Adjustable fuel pressure regulators fitting
will121 - 18/2/10 at 06:06 PM

anyone got instructions for fitting a adjustable fuel pressure regulator? just got a ebay special but no instructions, just need to know what connection is from fuel rail and which one is return please.

omega0684 - 18/2/10 at 06:11 PM

fuel rail exit goes in the back (so fuel inlet), fuel return is the bottom (back to tank), top outlet is vaccuum pipe to manifold. you adjust the fuel pressure by undoing the nut at the top (or doing it up)

HTH'S

[Edited on 18/2/10 by omega0684]

jacko - 18/2/10 at 06:15 PM

Can i ask what engine / carbs is it going on ?
if bike carbs all you need is a bike pump no regulators

tomprescott - 18/2/10 at 06:28 PM

Is it a rising rate regulator? Do you mind me asking how much you paid?

will121 - 18/2/10 at 06:30 PM

quote:
Originally posted by jacko
Can i ask what engine / carbs is it going on ?
if bike carbs all you need is a bike pump no regulators


its on throttle body'ed zetec, twin fuel rail 8 injector set up, was proposing to use the standard pressure regulator, but done a flow test and didnt get enough flow at the GSXR750 injectors 225cc/min @2.6bar for hoped power, so need to increase fuel pressure to 3 bar

omega0684 - 18/2/10 at 06:36 PM

why are you using an 8 injector set up?

jacko - 18/2/10 at 06:37 PM

OK sorry i thought you had carbs looking at your photos
Jacko

tomprescott - 18/2/10 at 06:41 PM

As ^^, why 8? Will it be a 4 constant and 4 supplementary or will it be 8 constant?

will121 - 18/2/10 at 06:54 PM

quote:
Originally posted by tomprescott
As ^^, why 8? Will it be a 4 constant and 4 supplementary or will it be 8 constant?


expected someone might ask why 8 and why dont i just make do with 4 as every one else generally does. im going down the Emerald ECU route which does twin fuel rail configerations, so wanting the best of both worlds (as always) im having the standard 2litre 225cc injectors firing upto say 5000rpm than GSXR750 300cc ones taking over from there. having it maped by Emerald so will be interesting to see what if any better spread of power there is. By the way the engine is for trackdays in a Fiesta not hoping for massive power be happy with 175-180bhp

will121 - 18/2/10 at 06:57 PM

quote:
Originally posted by tomprescott
Is it a rising rate regulator? Do you mind me asking how much you paid?


its basis adjustable fuel pressure regulator with vacuum idle pressure set back, not sure if thats rising rate or not. new in a box cost me £5.50+£10 P&P. think they about £25-£28 on ebay.

tomprescott - 18/2/10 at 07:08 PM

Cool, sounds interesting, let us know how you get on with it! I've heard that the smaller the injectos the better so 8 relatively small injectors should be better than 4 larger injectors. Good luck.

zetec mike - 18/2/10 at 11:28 PM

Dont want to sound negative but it sounds a bit over complicated. I'm running a 2.0l zetec on gsxr tb's with blackbird injectors and megasquirt. Its 220 bhp and I think the injectors are nowhere near their max flow yet.
Hope it goes well.

matt_gsxr - 18/2/10 at 11:54 PM

Staged injection isn't complicated really (MS and Emerald can handle it routinely). With zetec and gsxr TBI's it is almost easier to fill the "spare" injector ports with injectors than to find a different solution.

You should get mixture homogenisation from the outer injectors. I like it.

Will where are you with trumpet lengths? I see you have stock gsxr750 ones (i.e. 2 long, 2 short).


Matt

will121 - 19/2/10 at 12:25 PM

quote:
Originally posted by matt_gsxr

Will where are you with trumpet lengths? I see you have stock gsxr750 ones (i.e. 2 long, 2 short).

Matt


ive got another set of short and long trumpets, as yet not decided which ones to go for