Fuel pump mixture screw

Olelux

Active Member
Gday, I’ve just put the turbo on my 2.8 3l goes well but need more fuel. If anyone could post a pick of the screw location would absolutely awesome.
Cheers
Jarvie
 

Jaye

Well-Known Member
If you cant find the mixture screw I wouldn't recommend you touch it all, you may as well kiss the engine goodbye right now. It will last longer untouched, running a little lean than to be screwed with no idea of the actual fuel mixture and EGT's during the process. EGT's will essentially govern how much power or fuel you add and with no idea what they are you have no idea what is safe, its just an uneducated guess.
 

Aaron Schubert

Moderator
Yeah, I would probably agree with Jaye.

If you know what you are doing you can old school tune them by driving it, but this comes with years of experience. I wouldn't be touching the fuel screw without someone who knows what they are doing there

Aaron
 

Olelux

Active Member
So I have to know where the screw is just to settle my curiosity.im pretty sure I’ll adjust it myself in tiny increments. Please tell me this is it! The one with a bit of yellow on it I think is it. I do have a fair bit of mechanical knowledge and confidence to do the job and not screw it up lol
Cheers guys
Jarvie
F2B27480-5CAB-470B-A179-24DDEA01EAA6.jpeg
F2B27480-5CAB-470B-A179-24DDEA01EAA6.jpeg
 

Batts88

Well-Known Member
One of the the fellows at my work is qualified working mechanic in his 40's who recently fitted a turbo to his 80ser cruiser after he rebuilt his engine and he even took it to a turbo tuning specialist, for a measly $185 had it tuned so he didn't ruin his expesive diesel engine your choice.
 

Olelux

Active Member
Was that in Perth? Just got a $550-$580 quote for a tune!!! Ouch!!!!

edit: got another for $1450 holy sh!tballs
 
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Batts88

Well-Known Member
In mackay he was expecting it to cost more but happy with the price it runs well I think it's around10psi starting with low boost fitting an intrercooler later on.
 

Olelux

Active Member
That’s cheap as man. The cheapest I can find is $345 for a tune that’s $345 I don’t have atm as the minister of fun and finance has informed me lol
 

Olelux

Active Member
Man more words of wisdom lol think that’s what I’m going to have to do. But is the screw in the photo the one everyone goes on about? I hate this not knowing lol
 

Aaron Schubert

Moderator
It probably is that screw. I would at least consult a mechanic first though - they may find there are some other issues asides from 'needs more fuel'.

They are extremely underpowered from the factory, but in that state they go forever, and ever and ever.

Aaron
 

Petunia

Well-Known Member
valve clearance? pump timing?

yep just screw up the dezol? give it 3 turns? or 1/8th of a turn the opposite way to what you thought is should be?

there may be a lot more to a tune than just literally screwing up the dezol? ask questions as to exactly what you get for a $$$$$ tune?
 

SFA hilux

Active Member
Im 95% that’s the screw. I don’t know much about tuning and agree that the sensible thing to do would be to take it to someone who does. But...
I do understand about having a go at something yourself. From what I understand turning the fuel screw on a 3l will give you more fuel +power+ heat. Turning it out the opposite. Obviously there is a sweet spot.
If you have an egt gauge you should be able to monitor it.
Eg if you turn up the fuel and drive up a hill that you know well and the temp goes up quickly, back the foot off before getting too hot, go back home and turn the fuel down slightly.
Where is the risk in that? Am I missing something?
 

Olelux

Active Member
Well I’ve given the fuel screw a 1/4 turn and it has made a big difference. Egt can get up to 500 on a hot day though was fine towing my camper trailer up the hills on a cool day. So I might wind it back a smidge. Would like to know more about advancing the fuel pump a lil too, Just out of curiosity.
 

SFA hilux

Active Member
That’s good, I turned my fuel screw out to try and get it to run cooler! Definitely lost a bit of go. Don’t think it’s really running cooler either, i would say up a long hill it’s would probably not get as hot though, but general driving it’s much the same. What kind of egts do you get in general driving
I’ve got about a 50km drive to work it’s a bit up and down, most of the time I’m 350-400c @ 100kms. Seems hot to me?
Holding it flat for maybe 30sec to a minute up a hill I get to about 470, don’t know if I could get it much hotter.
I’d like to know makes much difference to engine longevity running at say 400 vs 300 on the highway.
Or is that not that important as long as you max egt isn’t too hot.
 
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