Quick Questions

[Kotta390]

1. When does the stock programming start to de-fuel at what rpm and/or what boost level?

 

2. Sorta goes with question one in a sense, but if I am to wind out the gears in my truck (NV5600) to get up to speed, what is the best rpm to shift at and/or not go over when going WOT?

 

 

 

[Killer223]

not sure but i think its like 2800. and it defeuls. as for boost without a fooler or programmer i think you'll see like 20-23 PSI is all it will let it build.

again I'm not positive on those numbers but i'm close.

 

if it were me and doing WOT runs i would shift at or around 2500 mark. that way next gear is right in the sweet spot of the torque. i would think anyhow.

[Kotta390]

interesting...

Anyone have fuel tables on when the Cummins defuels and how much after 2800rpms?

[AH64ID]

You should get 100% fueling at 22-23, as the wastegate controls it. I would guess you will start to defuel based on boost around 25.

[Kotta390]

Damn even that high of boost?

[AH64ID]

I just did a little research and it seems stock boost should be around 20.5 psi and the wastegate is set for 26, I would guess the defuel is in conjunction or just above the wastegate setting. That is for a HO, the SO will make the same boost but the WG is set at 23.

[Kotta390]

Mine is sitting at 21psi but I have my wategate unhooked from the elbow and where the elbow was there is now a plug. Soon to have a boost elbow installed, just curious.

 

My main concern I guess now is the defuel table to our trucks on stock setting.

[AH64ID]

Sounds like that is all the boost you can make with your fuel, do you have any fueling modules?

[Kotta390]

Sounds like that is all the boost you can make with your fuel, do you have any fueling modules?

No, AFAIK it is completely stock truck with what is listed in my sig. I really want a 65hp timing box like an Edge EZ, but that is it.