Turning up fuel and boost...related?

[anthonyamato4]

From what I can see I have a G code LDS injection pump that I installed on my LDT engine. It runs great. I watched a video on how to adjust my fuel so I understand that and I just hooked up my egt to monitor that....how does the boost get turned up. I'm running around 7 or so lbs of boost with 900 degrees on the egt....how do you turn up boost....or is it just turning up fuel turns up the boost?

 

[Nasty610]

Unless you have a waste gate on your turbo the only way to increase boost is to increase fuel. Did you time your pump to LDT or LDS specs?

 

[anthonyamato4]

I timed it to the LDT specs....OK sounds good. Just trying to learn more about how it all works

 

[anthonyamato4]

With fuel turned up what should I be running temp and boost wise that will get me the most power with out hurting the engine?

 

[steelandcanvas]

Where did you mount your EGT probe?

 

[anthonyamato4]

I mounted it right before the Turbo in the manifold

 

[steelandcanvas]

Aluminum starts to melt at 1210*F. My probe is mounted in the same place, I don't run her any hotter than 1000*F.

 

[Nasty610]

There are several guys that run 1200* F but that is short duration. With the piston oilers, if you have them, you're safe going above 1200* but I wouldn't suggest doing long pulls like that. Depending on how you timed the pump you'll be able to run more or less fuel. It was brought up a long time ago, and by me more recently, that by retarding the pump timing you'll be able to lower cylinder pressures to run more fuel and boost. No one that I can find has ever tried it though. Since you are running an LDT you'll have the 22:1 CR pistons and that is going to limit you a lot on boost. If you want to try it time your pump to LDT specs then record how much fuel, boost and your EGT's. Then retime the pump to LDS specs, keeping your fuel the same, and see if you get a drop in EGT's. If you do get a drop then you can run more fuel.

 

[m-35tom]

7 psi boost is way below stock power setting of 9. max boost will work out to near 14 psi depending on air temp.

 

[anthonyamato4]

OK so the only way to get the boost up is by turning up fuel ....right? Normal driving it sits at like 500-700 haven't seen higher then 900 when staying in the throttle so I have some room to turn it up....right?

 

[doghead]

Under a load, everything will change too.

A compromise is the best choice.


This was all covered before and should be in a sticky.

http://www.steelsoldiers.com/showthread.php?53010-how-to-turn-up-fuel-in-pictures

 

[anthonyamato4]

OK thankyou