Found this in Doug's '420+bhp project' thread...

[Flat on my back]

You can modify the FPR upto 5 bar - Mihnea has given me instructions on how to do this and Kim Collins told me how to do it when I asked for a motorsport FPR.

Marks FPR is coming in at £130 minimum for everywhere I could find that could get it - and 3 to 4 week leadtime.

We are going to see how we get on with the standard one and maybe stick in some bigger injsectors.
__________________
Doug

What's involved, or is it a bit of a 'trade' secret...please tell.

[twoqu]

Basicaly you crush it in a vice with a socket! You would still need to be able to measure the fuel pressure and its a one way trip!

[Flat on my back]

Eh...

Now i'm confuzed...running a AAN fuel rail and the FPR would appear to come apart. Well it will when i've finished with it!!!

[twoqu]

The circlip is there to keep the whole regulator in place. Its a self contained unit.
By crushing it slightly you increase the spring preload.

[Rusty]

Yeah, I had an FPR modded on an old Golf. Worked well.

[GazzaG60]

yep an old trick there.

check out snstuning.com for instructions with pics.

is it really necessary to have such fuel pressure though. better to grow the injector size a little.

[Flat on my back]

Agreed.

Just trying to make sure i don't have fuelling issues, bigger injectors going in + '44' bosch pump...not got that yet...hint...

Thanks for the linky.

[GazzaG60]

no worries.

send me a link for the 044 bosch if you find a cheap one but a real one. i got a holley forced induction pump in a box here but its inline and im lazy in winter. also not sure if itll sound like a refrigerated trailer.

[20Vcqdriver]

Carl, Would it not be just easier to use a variable pressure regulator with a gauge that has the vacuum attachment for enrichment as per the one I know you have already?!!

[Flat on my back]

Yes...i know David...

but with the fuel rail on the AAN the FPR is built in...so would require some 'butchery' to work!

Anyway the adjust. FPR is for the 7A...