GM mafless tune Gen 3- raised fuel pressure since last tune

Hey guys,

Have a motor to tune when I finally receive my HP software. The motor was in a street car and had a mafless tune, but now is in a sprint car so will be constantly at full throttle and high rpm vacuum.

My job was simply going to be to set what I think are correct afr's for the heat that is going to be generated during the race but since it was last tuned the engine has had a fuel pressure regulator on it and is running higher fuel pressure with stock injectors.

Do I need to change the injector flow data and if so how? Is there any spot where you are able to tell the ecu the delta fuel pressure?

I thought I would simply re tune the VE table but I was told that is incorrect.

Cheers

Damo

There is an injector flow rate table under the fuel tab, you will need to set this to the fuel pressure you are running, say you are running 58 psi with a vac referenced return style fuel system. You need to put 58 in all the cells.