With the quad commander, defueling set points can be entered. My question is what values should these be if you want to keep the information in the ECM close to stock values.

 

You don't need to set any de-fueling parameters to keep the ECM happy.

Now if you want to be safe set your EGT defuel at 1350 and set a warning for coolant at 215 and a transmission warning of 220. The warnings will only appear if they happen and defueling is not going to help them anyhow. The egt will defuel if needed and then apply the power back to where you had it set when the temps are back under the warning.

Do not mess with a boost defuel on a 04.5-06 Cummins. Even with the module in the off position is will hit near 40psi. So no need. If you want you can set a warning so you can ease off the go pedal. Other than that boost is what it is on these trucks.

Hope that helps.

Quad

 

I set my Commander to defuel at 1350* EGT's while towing the 5th wheel.

 

See this is where I get lost.

I hear 34-36 is all you need to go with the factory turbo.

Then I hear that factory they will hit 40 psi.

Will that 4 to 6 pounds make a big difference.

I really don't want to over spool a turbo and let the motor eat the turbine up.

 

The problem here is similar to something on another thread about what the Juice actually does. This forum contains info for 03-06 trucks when in reality the 03-04 and 04.5-06 trucks are pretty different animals.

If you were to run 40psi on the 03-04 truck you would most definately trash it. However the turbo on a 04.5-06 truck is drastically different and will handle 40-42 psi pretty easy and I have run mine over 50psi!!! I have 30k on my truck and I am not exactly easy on it. I figured I would have spit the turbo out by now, they seem to be pretty tough.


Quad

 

What about defueling on rail pressure? What set point should be a safe number?

 

I had my egts set to defuel pretty low when towing so when I hit a hill it would drop to the next level down, seeing if that would help fuel economy. It seems that crusing on 100 gets good mileage for my truck but being on the throttle on 100 hurts it, so I was testing it like that and haven't got to run it much like that, but I have also put the muffler back on and have a dump to play with on temps so we'll see how that goes.
Hey Quad when I was at ya'lls place there was a turbo sitting in Stans office, did that wind up in anything?