Author Topic: Why cant I adjust my fuel screw? (Read 10224 times)

MontanaGTD · « **on:** August 02, 2007, 05:10:49 pm »

I've had a go at it twice with come penetrating oil to loosen it off, but no matter how I try - or which kind of screwdriver I try I cant get it to budge!

Here are a couple of pics of my fuel pump/screw:-

Any help would be great!

coke · « **Reply #1 on:** August 02, 2007, 05:14:42 pm »

There is a 13mm nut behind it that has to be loosened first, did you do that?

MontanaGTD · « **Reply #2 on:** August 02, 2007, 06:16:01 pm »

Mine has a loose plastic collar, but no 13mm nut! Unless I have to break off that loose plastic collar?

BruceM31 · « **Reply #3 on:** August 02, 2007, 06:26:32 pm »

you have to remove the lock collar that is stpot welded to the screw itself. with that collar on you can back it off but not turn it in. easiest way to do it is remove the screw completely and cut the collar off. then you should be good to go!

MontanaGTD · « **Reply #4 on:** August 02, 2007, 06:47:25 pm »

I cant move the screw let alone remove it!

jtanguay · « **Reply #5 on:** August 02, 2007, 10:36:09 pm »

you need to break that piece off. its a safety thing so that you can't adjust your fueling....

RabbitJockey · « **Reply #6 on:** August 02, 2007, 11:28:51 pm »

yeah its a little piece of metal, just figure out where the ends of it are, and then pry it apart and pull it off, its madd easy,

saurkraut · « **Reply #7 on:** August 03, 2007, 09:12:46 am »

That black plastic collar needs to be removed. The 13mm jam nut resides under it. You may have all the adjustability you want with out removeing the steel collar. My steel collar is on, and I'm getting enough fuel off the LDA cone to push over 20 PSI boost easily.

compu_85 · « **Reply #8 on:** August 03, 2007, 10:29:24 am »

Hmm, so if you remove the steel collar, you can adjust it in more?

-Jason

saurkraut · « **Reply #9 on:** August 03, 2007, 11:27:25 am »

Yup.

But if you have a TD pump, try rotating your boost pin to the steepest slope and try that first. The results are pritty darn dramatic, and it doesn't fork up your idle, our your return to idle.

con · « **Reply #10 on:** August 03, 2007, 11:51:14 am »

I'm about to increase my fuel too. Has anyone got their boost set at 1.2 bar? If so how many turns of the fuel screw would be ideal to suit this boost level? My car is a 1.6 GTD and has an intercooler.

saurkraut · « **Reply #11 on:** August 03, 2007, 02:29:16 pm »

I'm a little above 1.6 bar. The collar is still on my fuel screw, and its not turned more that 1/8th turn.

Turning the fuel screw will not significantly change your boost. if your waste gate still opens at 1 bar, thats pritty much all you'll get, unless you really go nutz on the fuel screw and get boost creep. Then you'll get alot of smoke, hi EGT, and more power.

If you have a KKK turbo, you can turn in the screw on the waste gate and raise your boost a little. If you turn the screw in alot, the waste gate won't open all the way, and you'll have sort of a earlier boost creep, with less bypass, which gives lower EGTs than full boost creep. This is essentially what I have now.

The right way is a 'boost controller' (valve) to change the waste gate opening point. This way you can hit your boost target with out touching the fuel screw, and then adjusting your LDA pin to achieve the desired smoke/power level.

Anybody figure out where to get screw in hoze barbs for the KKK turbos?

MontanaGTD · « **Reply #12 on:** August 03, 2007, 03:42:49 pm »

Already done the fuel pin rotation and i'm running at 0.5bar at the moment - got a custom filter in the std air box with the restrictor removed and a mufflerectomy on the backbox - but other than that its std - I did 110mph out of it this evening on the way home without trying!

compu_85 · « **Reply #13 on:** August 03, 2007, 03:47:29 pm »

Sadly I just have an NA pump on the car right now. But I'll try that lill trick

No bits will fall out of the pump when the screw is removed, right?

-Jason

saurkraut · « **Reply #14 on:** August 03, 2007, 03:52:15 pm »

"i'm running at 0.5bar at the moment"

If you have your boost pin maxed out and you only get .5 bar, you have to do somehing about your waste gate.

More fuel with no more boost is an EGT problem waiting to happen.

Its kind of a chicken/egg thing: the more booste you get, the more pin move ment you get, the more fuel you get, the more boost you get....