Suddenly, Im a boy racer........

[Billy-No-Money]

Further to a question I posed a week or so ago about adjusting the fuel pump, I have been turning the adjuster screw down on a daily basis to see how far i could go before noticing a lack of power. Its now almost a complete turn anticlockwise from the starting point and the old truck has never run so well. Loads of low end power, almost instant throttle response from anywhere in the rev range, and the gears are changing in far more appropriate places (ie when you need them to). The other thing that is started doing is audibly dumping pressure from the wastegate in an embarrisingly 'hot hatch' fashion if I give it plenty of welly. Is this normal, or has my surf been parked too close to the neighbours XR3 and caught something? Im tempted to keep turning it down but I dont know if I would be leaning the fuel out to much and possibly doing harm to the engine. Any suggestions?

[Ballibeg]

You sure you're turning it down??????

Dave

[Billy-No-Money]

pretty sure. All the threads I read before touching it said that clockwise turned it up, and when did that i got no more power but loads (and I mean LOADS) of thick black smoke. Turning it back to the starting point got rid of the smoke and it went back to a bit of whitish smoke at startup, now there is hardly any smoke at all.

[Billy-No-Money]

Oh , and the fuel economy has vastly improved too.

[The Hornet]

Right now. I went clockwise with mine, half a turn and noticed a big improvement to performance. I assume I am increasing the fuel. Are you saying there's better results from anticlock wise. I assume your'e leaning yours. Can anyone say what is the best way to turn the screw? What is everyone else doing?

[Billy-No-Money]

Dont ask me! I was told on a previous thread that the reason I got no improvement and loads of smoke when I went clockwise could be that someone had messed with the pump before me and it could already have been over fueling. Kinda makes sense, but I cant understand why the performance is getting better if Im turning the pump down, and my main concern is can I be hurting the engine (or the pump) if I turn it down too far?

[marky]

Dont ask me! I was told on a previous thread that the reason I got no improvement and loads of smoke when I went clockwise could be that someone had messed with the pump before me and it could already have been over fueling. Kinda makes sense, but I cant understand why the performance is getting better if Im turning the pump down, and my main concern is can I be hurting the engine (or the pump) if I turn it down too far?

BANG!
Only joking

[Billy-No-Money]

BANG!
Only joking

caused by .....?

[marky]

IT WAS A JOKE!!!

[Billy-No-Money]

Oh, didnt see the only joking bit, too distracted by the loud bang.

[Billy-No-Money]

Im guessing that i I turn it down to much, to the point of starving the engine of fuel, It would run so badly that i i would notice before any harm was done?

[Sancho]

On a 2.4, I think this might be a pertinent point if you're going for a leaner mix:

http://forums.hypography.com/chemist...e-run-hot.html

In short, leaner mix = more total combustion = better running but with more heat = be careful messing with that screw.

[Billy-No-Money]

Good point, well put. I have kept an eye on the guage and if anything i would have said that it seemed to be running a few degrees cooler than before, but that could be my imagination. Surely the engine would run noticably hotter if it was about to melt a ring or put a hole in the pistons? Plus, Im in the process of getting hold of an intercooler, so wouldnt that help to combat a few degrees of extra heat in the combustion chamber, or is one going to cancel out the other?

[Sancho]

Good point, well put. I have kept an eye on the guage and if anything i would have said that it seemed to be running a few degrees cooler than before, but that could be my imagination. Surely the engine would run noticably hotter if it was about to melt a ring or put a hole in the pistons? Plus, Im in the process of getting hold of an intercooler, so wouldnt that help to combat a few degrees of extra heat in the combustion chamber, or is one going to cancel out the other?

I think it's the heat in the exhaust that you should be worrying about. Especially with those heads.

[Billy-No-Money]

so you think I should turn it back up a bit?