HOW TO: Set System & WUR fuel pressure

hi guys good write up will do this when my mk1 ABF is ready, with different engines does the pressure go higher or lower as its a 2lt rather than a 1.8? thanks

 

I imagine this involves buying the bits from your local industrial hose supplier - a Pirtek or similar - so you'd need to figure out what fittings you need in advance.

 

i would of thought as long as it k-jet then it should apply, ive done this on my own 2ltr 16v 9a modified engine. stealth racing adjust there wur mod to 48 psi, but they do have rolling road to get the right setup tho,

 

Got a few questions.

I found the guide a little muddled. Ive set my pressure to the specified amount but not sure if i did it right. The only way i found it could be adjusted was with the engine running and the stop tap open. Is that right?

Also my mate has a mk1 cab 1.8 8v kjet but when we took the wur off it looked like this and there didnt seem to be an adjuster screw. Can this mod not be done on the DX engine? Could you maybe switch the wure for a mk2 item?

 

Thanks.

Can anyone answer my question as to wheather i have done it right or not?

 

sounds like you did it okay...engine running etc

has the c/o been checked afterwards? go any better?

 

The reason i asked was because i had to adjust down from 5 bar down to 3.8 or whatever it is (cant be bothered to look back). Anyway i havent yet adjusted my co but so far so good really. No HUGE increase in power but it certainly is livelier! Had a good old thrash late the other night. I usually struggle a little top end with the 9A conversion but now it revs all the way no problem. Even got 130mph on my private airstrip!

 

Just thought id get this back up b4 the winter thread clean up

 

If your talking about the system pressure then that needs to be 5 bar { tap closed }, you add or take shims { washers } in the pressure valve to gain or reduce system pressure , the big hex headed bolt , at the front of the metering head. The system pressure, effects the warm up reg , so the wur now now needs to be adjusted back to 48 psi { tap open }, once all thats done , then go back and re-adjust the CO content to 2 %

 

Any idea what all the required fittings are? NPT? BSP? Sizes?

 

Can someone please clarify exactly where the shims go, as I'm a little confused...

 

I knocked up this recently for mine, gauge and tap I got off ebay found here and the rest of the fittings I got from pirtek, they cut one of them in half for me in the lathe and then I drilled a hole in it and silver soldered part of an old line into it to be able to attach it to the metering head, the tap end where the original hose connects to, the fitting isn't perfect their but it is good enough for these purposes. The trouble with kjet stuff is, it is metric nuts with imperial pipe fittings inside, so nothing off the shelf seems to work, it cost about 23 all in.

Pic

 

any details of actual thread sizes? would like to do the same

cheers

 

hi, I found a video which might be useful