adjustable fuel presure regulator

[metro1]

does anyone have experience with one of these sytec compotion adjustable fuel pressure regulator and fuel filters as my current regulator is holding back performance so when I get my new fuel rail made I want to order a new regulator and filter I am going to be using a facet red top works pump the car is powerd by a 220hp rover k series engine which will undergo some fairly serious modifications within the next few months im open to sugestions if this coombination isnt up to the job or theres a better combo out there


fuel pressure regulator

http://www.demon-tweeks.co.uk/motorsport/fuel-pres...

fuel filter

http://www.demon-tweeks.co.uk/Search.do?method=del...

Edited by metro1 on Monday 30th July 21:26

[stevieturbo]

metro1 said:

does anyone have experience with one of these sytec compotion adjustable fuel pressure regulator and fuel filters as my current regulator is holding back performance so when I get my new fuel rail made I want to order a new regulator and filter I am going to be using a facet red top works pump the car is powerd by a 220hp rover k series engine which will undergo some fairly serious modifications within the next few months im open to sugestions if this coombination isnt up to the job or theres a better combo out there


fuel pressure regulator

http://www.demon-tweeks.co.uk/motorsport/fuel-pres...

fuel filter

http://www.demon-tweeks.co.uk/Search.do?method=del...

Edited by metro1 on Monday 30th July 21:26

Either should be fine for that power level. But what exactly is the problem with what you are using ?

And I assume as you mention a Facet pump, the car is using carburettors ?
Which does contradict you choosing a fuel injected regulator.

[1point7bar]

I thought that.
Isn't a facet red top a low pressure pulse pump?

[metro1]

when the engine was being used in my old car it wasn’t always getting enough fuel but we were unsure whether the pump was the problem or the fuel pressure regulator was the issue we had no problem until fitting the throttle bodies I know the mapping isn’t the restriction anyway I know the regulator fitted is limited to 3 bar the engine is now going into a kit car so I consider it the ideal opportunity to overall the whole fuelling system I was told a red top would be more than adequate for my requirements by rally designs and even told them I was running exige throttle bodies

[stevieturbo]

metro1 said:

when the engine was being used in my old car it wasn’t always getting enough fuel but we were unsure whether the pump was the problem or the fuel pressure regulator was the issue we had no problem until fitting the throttle bodies I know the mapping isn’t the restriction anyway I know the regulator fitted is limited to 3 bar the engine is now going into a kit car so I consider it the ideal opportunity to overall the whole fuelling system I was told a red top would be more than adequate for my requirements by rally designs and even told them I was running exige throttle bodies

How can you be unsure ? it either is or it isnt ?

Explain exactly what your setup was. I really cant imagine how the regulator is posing a problem.

[metro1]

its a 1.8 rover k series the spec is largley unknown as i bought the car with most of the work already done but the parts i do know that were on it were
exige throtle bodies with standerd injectors and fuel rail i know the injectors are good for 300hp custom ported head with std cams and oversized valves as large as posible ready for solid cams i think the bottom end is modified but i am uncertain as i havent stripped the engine down any as for the fuel pump i never found out what it was as the price of the kit car included the metro shell and my collection of spare wheels i know that it wasn't a problem with the mapping as the car was set up at emereald i had a couple of weekend events and the car was running well then halfway through the third i started running into problems

[james0]

Surely if the injectors are the right size, 3bar is fine. What Ecu is it running and would it not need a re-map for the totally different intake?

[metro1]

its an emerald ecu and it had a maping sesion after the throtle bodies were fitted i think the bodies need a lot more presure to flow the fuel at the higher revs but i may be wrong im no mechanic

[1point7bar]

A Bosch high pressure rotary vane pump @>40psi would help.

The facet is for low pressure carb float bowl filling.

Edited by 1point7bar on Wednesday 1st August 21:45

[stevieturbo]

metro1 said:

its an emerald ecu and it had a maping sesion after the throtle bodies were fitted i think the bodies need a lot more presure to flow the fuel at the higher revs but i may be wrong im no mechanic

You're wrong.

Fuel injection is fuel injection. Wouldnt matter if there was a single TB or 5000. Pressure is dictated by the regulator assuming the pump is capable of supplying enough flow to maintain pressure

So it's still unclear. What exactly is the problem you are trying to "fix" ?

300bhp isnt a huge ask of a fuel system. So what pump do you have ?how is it plumbed ? What size fuel lines ?

[james0]

Sorry missed your post at 8:52. If it ran well for the first couple of events, then surely its a fault rather than a spec issue. If 3bar was not enough it would show during mapping. Maybe take it back to the rolling road and get them to check it.


Eta

If you mess with the fuel pressure, it will throw the whole map off. Its best to find out the cause of the assumed lean condition first.

Edited by james0 on Wednesday 1st August 21:54

[metro1]

im going to get it maped when the new cams go in after i have finished building the new car if i fit an adjustable they can set it up when its mapped and i have the option to raise the pressure if i need it but i have heard they dont hold the presure verry well if i nee to get another pump i will have to look for one that wont need to be submerged in my new fuel tank as i dont want to have to cut any holes in it

[stevieturbo]

metro1 said:

im going to get it maped when the new cams go in after i have finished building the new car if i fit an adjustable they can set it up when its mapped and i have the option to raise the pressure if i need it but i have heard they dont hold the presure verry well if i nee to get another pump i will have to look for one that wont need to be submerged in my new fuel tank as i dont want to have to cut any holes in it

What doesnt hold pressure very well ? Your post makes little sense ?

Why would you be cutting holes in anything ? And if you have an in-tank pump now, why would you look for an external one ?

[stevesingo]

stevieturbo said:

What doesnt hold pressure very well ? Your post makes little sense ?

Why would you be cutting holes in anything ? And if you have an in-tank pump now, why would you look for an external one ?

That is because there is no punctuation!

[metro1]

The new fuel tank has no pump fitted and i do not want to cut it open to fit one as i cannot weld aluminium.I have heard on another forum that adjustable fuel presure regulators do not hold a stable presure verry well.i was told the facet one was an extenal pump i havent even got it out the box yet just in case i need to sell it on.Sorry for any confusion

[stevieturbo]

metro1 said:

The new fuel tank has no pump fitted and i do not want to cut it open to fit one as i cannot weld aluminium.I have heard on another forum that adjustable fuel presure regulators do not hold a stable presure verry well.i was told the facet one was an extenal pump i havent even got it out the box yet just in case i need to sell it on.Sorry for any confusion

Wherever your getting the information from, stop listening to them because it is bull....and will see you buying lots of useless parts.

So you're now saying the new tank is designed for an external pump ? Which you do not have yet ?

Whoever is saying an adjustable regulator does not hold stable pressure is clearly an idiot. Stop listening to them.

The facet may be an external pump, but once again it is not designed for fuel injection so would be totally useless for your application.. Whoever told you to buy it...once again, is an idiot. Unless of course you didnt supply the seller with the correct information in order for them to supply a suitable pump.

You say Emerald mapped the car previously, and are likely to map it again. If you are unable to filter out the nonsense from the internet from sense, I suggest you speak to Emerald or leave the car with them so they can supply and install a suitable fuel system or at least spec it for you.

[tristancliffe]

metro1 said:

and i have the option to raise the pressure if i need it

In what scenario would you need to increase the pressure? You do know it'll spoil the mapping (unless you have several maps done at different pressures, although it would be a pointless waste of money)?

When you fit your new cams, and take the car back to Emerald, they will tell you if you need a better pump or bigger injectors or a new regulator. And chances are they will be able to supply something on the day as well!

[blitzracing]

stevieturbo said:

Whoever is saying an adjustable regulator does not hold stable pressure is clearly an idiot. Stop listening to them.

Thats a brave statement considering just how nasty cheap regulators can be- I tried a £25 one off ebay, and the screw thread was so course the adjustment was vague at best and it was difficult to get a decent lock with the locking nut on the course thread so I could never be sure it was stable. I certainly would not recommend something at that price.

[1point7bar]

I think facet red top can buid pressure against a float valve and it can flow ok gal/hr but not open flow pressure.

The facet would scavenge well for a surge tank to then gravity feed an injection pump, nearer the engine the better.

[anonymous-user]

blitzracing said:

stevieturbo said:

Whoever is saying an adjustable regulator does not hold stable pressure is clearly an idiot. Stop listening to them.

Thats a brave statement considering just how nasty cheap regulators can be- I tried a £25 one off ebay, and the screw thread was so course the adjustment was vague at best and it was difficult to get a decent lock with the locking nut on the course thread so I could never be sure it was stable. I certainly would not recommend something at that price.

They also have very poor seat seals, and short stiff springing, so the pressure setpoint varies massively with return flow. Everyone sets the pressure at idle, when the engine is not consuming any fuel, say to 3.7bar(g), and at peak engine consumption, where return flow is only 10% of supply, the cheapo one i tested was down to 2.1bar(g)!