All those with Adjustable Fuel Pressure Regulator upgrades

stevepudney

stevepudney

GTiROC CHAIRMAN
Staff member
I've got one turning up tomorow and want to fit it

Could you please do me a big favor and post (or email me) pictures of your fitted upgraded regulator so I can see where to put all my pipes,
just to make sure I get it right. Any info would be good but a photo would be better

Steve
 
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Sirnixalot

Guest
right now my car isnt running but i would keep it set to 43.5psi @ full throttle...to se it just start the car and remove the vaccuum hose from the fuel pressure regulator...thinks its at wide open throttle then. Um to connect that regulator see here

http://www.fuelsystem.co.uk/newpage4.htm
 
coxie

coxie

New Member
i have one of these fitted and its a piece of p*ss to fit. make sure you have the correct fuel rail connector and don't damage the o ring when you swap it over.
 
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gotoinstant-redline

Guest
did either of you notice an imporvment in performance after fitting?
or steve, could you report back after you have fitted yours and let us know what if any diffrence it made.

i've got one on my car but it was added at the same time as loads of other stuff.

L.
 
coxie

coxie

New Member
at 1bar hiteq checked my fuelling and said it was spot on but with a small lean patch for a split second at mid range. suggested an uprated fuel pump and regulator. with these fitted we checked fuelling again and found it was rich to the point where i had the boost pressure adjusted to 1.25 bar and the fuelling was superb but still a bit rich. definately worth the cost
 
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pschurr

Guest
Cripes, you're not gonna just put a different fuel pressure reg on and turn up the fuel pressure? without at least understanding what your existing air/fuel ratios are, are you?

When you change fuel pressue, the ECU has no idea, and so continues to pulse injectors under some comprehension of the factory fitted regulator.

The best you can do is make it richer - which won't improve performance (power) unless there's something else wrong with the fuel system and you're dangerously over-lean now.

The worst you can do is set it incorrectly and drop the pressure so now you ARE dangerously lean, which could be very nasty.

Get the car on a dyno (rolling-road?) and get a power and gas-analysis done. This'll tell you where the fueling and induction systems are in terms of afr. If that data tells you you need more fuel, then look at a regulator or fuel pump or whatever.

I love those websites... any car, just add this device and it'll improve performace, reduce emissions, improve fuel economy... yeah, my arse!


peter
 
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turblio

New Member
pschurr,

you must be the first person who has ever spoken the truth about
slapping an uprated fp reg on, unless the engine can induct and burn the
extra fuel you will get bore wear very quickly
Frank
 
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Olly

Guest
I also heard that the FSE one that increases 1.7 times more than standard can also cause trouble cos the R's standard brain can't see this (so basically An adjustable regulator with a standard car will just cover up a problem,possibly) Took mine off after 5 minsand stuck it on my Escort :lol: and I just use a uprated pump and stock regulator. 11.7 afr on full throttle good enough for me nice and rich. 8)
 
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pschurr

Guest
Now, if you had an ECU that monitored fuel pressure electronically, and therefore 'knew' the relationship between injector pulse length and the actual amount of fuel delivered.... that'd be something.

But most of the electronic fueling and ignition timing is calibrated to a set of static assumptions about things like turbo/intercooler efficiency, fuel pressure, and injector flow rates.

One of the most interesting forms of closed-loop engine management is - yep - closed loop management, ie. dynamically monitor AFR and adjust fueling to maintain an ideal AFR.

Does anyone know what set of conditions need to exist for the factory ECU to go into closed loop mode? It isn't active all the time, right?


peter
 
coxie

coxie

New Member
the adjustable regs from glencoe are already set at the correct setting it says this on the instructions and was told this by hiteq. he was proved right when he used the wide band lambda for checking the a/f ratio. the extra pressure the reg puts on the return of the injectors combined with the uprated fuel pump made my cars fuelling a bit rich at 1.25 bar. i can have took it higher now if i want because i have a fuel computer fitted now. this still has plenty of adjustments left on it.
 
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tweenierob

Guest
Firstly....

Everyone must understand that an adjustable fuel Reg is not something that should ever be fitted without the use of a fuel pressure gauge!!
Do not think that the Fcatory setting is right!!!!!! the ONLY way to set the fuel correctly is using a gauge...

The ECU goes into closed loop when the car is on vacumn (ie. 0psi and below) when the map sensor senses zero pressure and vacumn it tells the ECU to go closed loop and use the Lambda for fuelling.

The correct way of setting one up is as stated with the car idling and the vacumn hose removed from the FPR, make sure you bloke the vacumn pipe when you remove it. Ideal fuel pressure is 3bar at atmospheric (vacumn disconnected)

The FSE rising rate FPR (1:1.7) is ideal if you want to almost get the effect of having larger injectors, but only really nessecary on high boost cars IMHO.

As with almost every bolt on it must be set up properly, do not buy an FPR thinking of it as a performance Mod, think of it more as a precautionary Mod :).

Rob
 
coxie

coxie

New Member
thats exactly why i bought mine because i was told it was a bit lean...

also i won't say no to a bit more boost if it is safe to do so.i've got the engine internals/turbo/fuelling checked..................
 
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pschurr

Guest
Rob,

My current understanding is that the factory GTIR ECU has no connection to the MAP sensor, and doesn't use the signal in any way. There's certianly no pin on the ECU loom connector for MAP signal.

I always thought the MAP sensor simply drives the gauge. I'm thinking that the ECU makes a decision based on RPM and AFM (MAF). This is the only way he could derive some concept of boost.

yeah? no?

peter
 
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tweenierob

Guest
I may be wrong mate regarding the map sensor, but every other car i can think of including normally aspirated cars use the MAP sensor for pressure readings at the ECU.

Do pulsars have Fuel Cut?? if so then the ECU deffo takes a signal from the Map sensor somewhere. The reason i ask if they have a FC is because i know of a particular pulsar that was running with no WG pipe connected and did not suffer FC, It did however suffer Engine Failure :D

It would be interesting to know for definate about the MAP signal, how would the ECU switch from closed Loop to open Loop?? Maybe Airflow signal from the MAF...

Maybe back on topic :D :D

Is that Certain that there is no pin out for the Map??

R.
 
stevepudney

stevepudney

GTiROC CHAIRMAN
Staff member
The only reason I got this in the first place was a precautionary mod as my injectors are nearly maxed out @ 1.4 bar with the bigger turbo and also for future planned engine mods (600 injectors, 2.1 stroker and Power FC e.t.c.).

I sent the power boost valve back and swooped it for a standard adjustable fuel reg. When I set it up I fully intend to use a fuel pressure gauge I already have, to check the pressure I'm running and make sure it's set to the same around 3 bar, then get everything mapped again along with a new Power FC.

No DIY bodge jobs around here, you do learn some things after 25 years of playing with cars
 
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gotoinstant-redline

Guest
there is a boost cut solenoid on the R. it connects to pin 111 on the ecu plug. so somehow the car can measure boost above a certain level. the map sensor maybe??

L.
 
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