I was wondering what people run at WOT for their air fuel ratio. I was running 10's at WOT. I think that is excessively too rich. I think my Graneteli Mass Air Flow is causing it. I put the stock MAF back on but have not had it dynoed again since then. I know perfect stoichometric (can't spell) is like 14.7 which I will never reach. It starts out 13's and at about 2500 rpm just reachs to 10's throughout the rpm's. Has anyone else encountered this. I think my stock MAF sensor made my car more lean. I am about ready to get a custom tune done and throw away that hypertech. The hypertech I would have thought would have leaned out my car more for more optimal power. It seems to be more of a headache then that is worth too.

Your thoughts.

 

12.5 is close to optimum for power at WOT. Different engine combos like different A/F ratios so 12.5 is not set in stone.

 

I agree but 10's to me are too rich in my opinion for my application. I don't think anyone should run that rich.

 

No thats to rich to make decent power.

 

Most NA LT1's make a few more hp in the low 13.X:1 range. But if you set yours up to run that lean you have to be careful. Heavily loading the motor, especially if it's hot can lead to detonation, which is not good for parts or power. Ditto for a change in atmospheric conditions from when it was tuned, resulting in an even leaner mixture.

Rich

 

And the stoichiometric A/F ratio may be "perfect" for low load operation, but that's not what you want as max power/max torque. 14.7:1 is good for low emissions and decent fuel mileage.

The stock programming on an LT1 generally sets a target A/F ratio of about 11.7:1 at WOT (PE mode). And that's too rich. Simply leaning the PE tables out to produce a target in the range of 12.8-13.2:1 will net you a quick 15HP.

If I were you, I'd try putting the stock MAF sensor back in, and deleting the HPP "power programming" if you're using it. Both those can be problems.