Fuel rail adapter for Adjustable Pressure Regulator..

[neal1980]

Anybody know where I can find one for a rover V8 Engine so I can fit a 1:1 adjustable FPR.

Cant seem to find one anywhere unless Im not searching for the right part...

Thanks

Neal

Edited by neal1980 on Monday 19th April 11:13

[rev-erend]

I have one on mine - can't think where I got it .. I can dig thru my receipts later.

You could also give glencoe a shout .. they will know.

http://www.fuelsystem.co.uk/

[blitzracing]

You could get them from Demon Tweeks as part of a Malpassi variable prssure kit, but Im not sure if they would sell just the adaptor.

[Steve_D]

RPI Engineering offer a direct replacement pressure regulator so no mods required to the fuel rail. Can be adjusted and connected to vacuum if you want rising rate regulation.

Steve

[stevieturbo]

neal1980 said:

Anybody know where I can find one for a rover V8 Engine so I can fit a 1:1 adjustable FPR.

Cant seem to find one anywhere unless Im not searching for the right part...

Thanks

Neal

Edited by neal1980 on Monday 19th April 11:13

What's wrong with the regulator thats on it ? Or are you starting from scratch ?

[neal1980]

I have the standard regulator one and I believe this is 2.5 Bar.

Im using 8 x Saab Turbo Injectors and the flow rate they work on is at 3bar so wanted to use them at that.

Its for my ever on going turbo project and if I get an adjustable one it will give me a bit more to play with I guess.

Neal

[stevieturbo]

neal1980 said:

I have the standard regulator one and I believe this is 2.5 Bar.

Im using 8 x Saab Turbo Injectors and the flow rate they work on is at 3bar so wanted to use them at that.

Its for my ever on going turbo project and if I get an adjustable one it will give me a bit more to play with I guess.

Neal

They will still work at 2.5 bar. Although typically most systems do use around 3 bar. Might be worth trying it first.

I fitted a pretty rough adaptor to my old rails with a -6 fitting on it so I could use a remote FPR.

Although if doing it again, I'd probably just weld a -6 fitting to the rails themselves.

[neal1980]

What adjustable regulators do you recommend then?? Heard that FSE are noisy and I dont want that :-(

[stevieturbo]

Ive never heard a noisy regulator in my life. It's a lump of metal with a hole in it, a diaphram and a spring.

Do the noisy ones play tunes or something ?

I'd test the OE one first to see what pressure it does work at. Would save a few quid if it was fine.

[neal1980]

My mates got an fse on his and it makes this really loud noise at it primes. Difficult to explain but could be faulty I guess. Do you rate the FSE ones? The ones I see advertised are rising rate and I want 1:1 do FSE do these. A full kit would get me the adapter I need as well.

Dont want to use standard one want new and shiny..

[grahamw48]

I had a FSE 'powerboost valve' fitted to my hotwire RV8 last year, to get the fuelling right on the rolling road. It was a direct replacement for the original non-adjustable (or limited) type, made no noise, and achieved the desired result.

Part number on the box is VK-384-18-H.

[stevieturbo]

neal1980 said:

My mates got an fse on his and it makes this really loud noise at it primes. Difficult to explain but could be faulty I guess. Do you rate the FSE ones? The ones I see advertised are rising rate and I want 1:1 do FSE do these. A full kit would get me the adapter I need as well.

Dont want to use standard one want new and shiny..

FSE are not shiny though...usually a dull grey.

Ive never had a faulty one yet though.

New and Shiny..

Aeromotive, Fuelab and that type of thing. But they also tend to be more expensive and require AN/JIC fittings, which again bumps up cost. Whether its 1:1 or teh FSE claimed rising rate of 1.7:1 which I wuestion doesnt really make much odds.

I assume you have some sort of ecu where you can take control of fuelling ?

I wouldnt be buying some of the crap FPR's you see on egay though. Ive seen so many faulty ones of those its unreal...especially ones claiming to be SARD, very tiny looking units. Complete dung.

[spend]

It's not the pressure in the fuel rail you want to control, it's the pressure across the injector. Otherwise your maps (interpolated) would be dosing strange amounts of fuel if you think about it?

[stevieturbo]

???

What do you think a FPR is for ? It controls fuel pressure above the injector, which in turn is sometimes also referenced to intake manifold pressure on the other side of the injector.

[rev-erend]

So Spend - is there some other device that we should be aware of other than an FPR ?

Edited by rev-erend on Wednesday 21st April 15:54

[Steve_D]

neal1980 said:

.......The ones I see advertised are rising rate and I want 1:1.......

If you don't want rising rate then don't connect the vacuum pipe.

Steve

[eliot]

Steve_D said:

neal1980 said:

.......The ones I see advertised are rising rate and I want 1:1.......

If you don't want rising rate then don't connect the vacuum pipe.

Steve

Not strictly true. The vacuum pipe is to maintain a constant pressure differential accross the injectors (atmos/manifold) as steve pointed out.
You could leave the vacuum out and remap the engine to compensate, but a vaccum referenced one seems to be the standard and means you can use a map from someone else without having to completely start from scratch.

[stevieturbo]

Steve_D said:

neal1980 said:

.......The ones I see advertised are rising rate and I want 1:1.......

If you don't want rising rate then don't connect the vacuum pipe.

Steve

rising rate implies it increase fuel pressure more than 1:1 with boost, although TBH, I dont think this actualy happens with these regulators that claim circa 1.7x rising rate.

If you left it off fuel pressure would stay the same, and when boost pressure is seen....pressure available to inject fuel will be dramatically reduced.

[neal1980]

I rang fuelsystems and they recommend FSE vk473-18H

This is an FSE that was made for turbo cars, scoobys evos etc.

Will run 1-6 Bar and is 1:1 and comes with the adapter kit so think I may be there

[stevieturbo]

Your cheapest option is a 2wd Cossie one if you can find one second hand. It has 8mm hosetails, and is adjustable.