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View Full Version : Turbo conversion, fuel pressure regulator?


midge
16-07-2009, 13:16
do you need to put an adjustable in there? or is all the standard stuff fine?
Laine_16v
16-07-2009, 14:53
Depends if the chips mapped for a rising rate FPR or not, i know Lee's Turbo clio has a FPR with vac connection on it, so it's rising rate.

Alsmot certtain coops is the same and no doubt maxiboy.

If your using a FastChip you'd need one i reckon.
Coops
16-07-2009, 15:26
pm replied and as above, rising rate required
schakal
16-07-2009, 15:43
i have a weber adjustable fpr setup for the turbo conversion
if you are after one :)
stan
16-07-2009, 18:14
yes, as fuel pressure needs to increase proportionally to intake boost pressure.
sideways danny
16-07-2009, 23:42
yes, as fuel pressure needs to increase proportionally to intake boost pressure.

that's what connecting the vac line does
Laine_16v
17-07-2009, 07:21
Unless you can map it to a static pressure of 3 bar? or do the injectors run out of puff at 3 bar on a turbo setup?
sideways danny
18-07-2009, 15:14
Unless you can map it to a static pressure of 3 bar? or do the injectors run out of puff at 3 bar on a turbo setup?

the reason you run a pressure/vac feed to the regulator is to sustain a constant pressure. Boost inside the inlet will create a restriction to fuel trying to exit the injectors, so you add boost pressure to fuel pressure and get a constant. If you run without a vac line attached, your fuel pressure is effectively being reduced by boost, so run 1 bar of boost, and you get 2 bar fuel pressure (in effect).
AndyFielder
20-07-2009, 09:40
doesnt the standard fuel rail and reg work, it has a vaccume line...
Laine_16v
20-07-2009, 11:24
doesnt the standard fuel rail and reg work, it has a vaccume line...

I believe the standard regulator works the opposite way around. I.e it decreases fuel pressure with VAC, to save fuel while cruising.
AndyFielder
20-07-2009, 11:57
oh ok, didnt know that!!
sideways danny
20-07-2009, 14:30
doesnt the standard fuel rail and reg work, it has a vaccume line...

YES!!!!! reduced pressure with vacuum, increased with boost. Just like any regulator
stan
21-07-2009, 10:58
yes, as fuel pressure needs to increase proportionally to intake boost pressure.

that's what connecting the vac line does

:? i know

what im saying is, not all vac ones INCREASE fuel pressure.
AndyFielder
21-07-2009, 11:04
so can i just confirm standard fuel lune and reg wont work?
Coops
21-07-2009, 13:54
it will work to a certain extent but not above around 10psi or so i've been led to believe, never tested it myself but for the sake of 50 quid its worth the 'upgrade' as it were to be safe imo
sideways danny
22-07-2009, 04:39
got it working fine at around 15 psi on a stock regulator.

The only benefit you might see with an upgrade is a greater range of correction, ie, if you were running 2 bar for example (extreme case) the stock reg would likely be out of range
stan
22-07-2009, 09:25
When I tested one, couldnt get it to correct more than 5psi.
Crossers
27-07-2009, 06:08
Standard one worked fine on mine.

Paul
volymmannen
27-07-2009, 10:58
standard works but if you want increased fuel pressure at higher boost, you want a progressive fpr.

linear fpr 1:1 ex 3bar fuelpressure is always 3bar over manifold pressure
Progressive ex 1:1,2 at 1bar boost you get 3x 1.2 = 3,6bar