Is there such a thing as an injection fuel pressure regulator? I'm looking for a regulator for when I go EFi- will any old thing do (like a FilterKing) or do I need to check what PSI it can handle- I seem to recall the pressure/flow requirements of carbed vs injection pumps differs.....

http://cgi.ebay.co.uk/Premium-Adjustable-fuel-pressure-regulator-with-gauge_W0QQitemZ170098300422QQcategoryZ72205QQrdZ1QQcmdZViewItem
fleabay for mine

Cheers!!! I'll go shopping on Ebay then....
I found some which go up to 10 Bar- would have thought by then (3* nominal pressure) the injectors would be either blowing off the fuel rail or the injectors would be cream crackered...... Just wanted to check there aren't any other limiting factors!!!
Thanks again...

My FSE fuel regulator came with an oil filled gauge. I've set mine at 1 bar which is fine for my setup - it goes to 5 bar if needed. There's no real need to install one unless you have got a non standard setup - i.e. mine has a different inlet plenum & larger injectors.

Go scrappy hunting, pretty much every petrol car built in the last 15 years has one of some sort, it won't be difficult to find one you can use. They're small things, amazing how often they can accidentally fall into a toolbox without you realising

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Originally posted by RazMan
There's no real need to install one unless you have got a non standard setup

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Originally posted by CaLviNx
Cue "MikeRJ" spouting something else though

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Originally posted by martyn_16v

Every efi system will need some form of fuel pressure regulation, the pump alone can't maintain a consistent enough pressure across the range of operating conditions.

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Originally posted by RazMan
My FSE fuel regulator came with an oil filled gauge. I've set mine at 1 bar which is fine for my setup - it goes to 5 bar if needed. There's no real need to install one unless you have got a non standard setup - i.e. mine has a different inlet plenum & larger injectors.

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Err no, thats what the mapping guy set it to. It rises to 2 bar without vacuum. I think that is the pressure that Ford efi systems are set as standard.

the last fpr I robbed off a mondeo zetec was 2.7 bar, about 3 is the norm AFAIK. Too low a pressure and the injectors won't spray properly so yours can't be too far wrong if it goes alright.

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Originally posted by RazMan
Err no, thats what the mapping guy set it to. It rises to 2 bar without vacuum. I think that is the pressure that Ford efi systems are set as standard.

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I used one from an astra, its a bosch unit that has 3 connections, fuel in, fuel out and vacuum.It may be usefull to be able to adjust it but it is another variable when mapping, if adjusted after the engine is set up the fueling would be incorrect and require remapping.
Im looking for one for my new setup using gsxr throttle bodys and plan on visiting the scrapyard for one next week,
Paul

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Originally posted by TangoMan

Raz, You should confirm that he was correct because it sounds unlikely that the manifold vacuum at idle will adjust the presure by 15psi. mine alters by around 3psi. I thought Fords ran around 2.3 -2.5 bar as standard.

He may well be correct but it wouldn,t hurt to be sure!!

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Just did a bit of digging on the FSE site....

"Firstly, this valve has an adjustable fuel pressure, effected by the movement of an adjustment screw on the crown of the unit.
New Power Boost Valves are pre-set with a maximum fuel pressure of 2.5, 3.0 or 3.5 bar, depending on the vehicle in question, and similarly (to the original valve) the fuel pressure is reduced by 0.5 bar approximately at idle. There the similarities end.
On acceleration from standstill the Power Boost Valve fuel pressure will increase at 1.7 times the standard rate. This will produce a healthy, strong fuel mixture strength which will instantly improve the drivability of your vehicle, providing:-

instant throttle response
removal of performance flat spots
faster acceleration
extra engine performance

The regulator enhances engine performance on acceleration by enriching the mixture strength. On constant throttle and cruise conditions the valve returns to a normal regulator function."

Obviously they are blowing their own trumpet but I went and bought one as the oem Ford jobbie was actually more expensive. Hey ho ...

[Edited on 5-4-07 by RazMan]

Hi Razman

nowt daft meant by my comment, just that it won't be set to 15psi (1 bar) that is daft, the injectors will barely spray at that pressure.

On a normally aspirated engine ignore the "pressure variation" of the valve, be it "rising rate" or any other ( I use these fse ones as I have them laying about, but weber ones are much better and more reliable )

I take it you son't have a supercharger on it yet? On forced induction you will obviously see the fuel pressure rise by the same as your boost pressure, but on a normally aspirated setup, its pretty standard to just vent the compensation port of the regulator straight to atmosphere (that's how mine are and have been on the last 4 cars)

Pressure wise as other have said, std systems run at 2.5 or 3 bar normally, the off the shelf OEM bosch regulators are nearly all 2.5 or 3 bar.

No supercharger yet as that is going to have to wait a while (my bank manager is still recovering from the final push to SVA ) I've got the larger injectors fitted and the fuel regulator so the scene is set - just the expensive bit to get now

You got me thinking and I double checked my fuel pressure. It is actually 1.5 bar at tickover and 3 bar with the vacuum pipe off but (tickover gets very lumpy) so I assume the FSE regulator plays a role in improving tickover at higher fuel pressures, although I would imagine that mapping could compensate for this too.

[Edited on 6-4-07 by RazMan]