1992 GMC new motor needs to be tuned

[dave w]

Should I get another tbi? The 670 or a highly modified one? I read the 670 has issues such as rough idle etc. what are your thoughts?

As a general rule, performance modifications to a TBI system require some "Tuning" of the PROM Chip programming. Usually a few data logs will be required to "Tune" a 670 CFM Throttle Body.

[Mgezee2818]

As a general rule, performance modifications to a TBI system require some "Tuning" of the PROM Chip programming. Usually a few data logs will be required to "Tune" a 670 CFM Throttle Body.

Understood. So, what is the easiest way to do this? I really don't have time to get into all the technical things of preparing my truck to tune it. How can I simplify this? Can I take it someone locally who does this? Do you do this for a fee or do you know someone who can set me up with thingand I can have my mechanic to do it? Being in the military, I am on call a lot and can't get around to this right now. Thanks for any help.

[dave w]

I'm a military veteran, I completely understand the many challenges of military service. I don't think there is an easy way to tune a performance modified TBI engine. The members I've help with "Chip Tuning" were able to provide TunerPro RT data logs.

dave w

[dave w]

Attached are a few screen shots of information I use from TunerPro RT to tune a chip. These pics are from a "tune in progress". The vehicle is a 1992 K1500 with a performance TPI 305, roller cam, Trick Flow Heads, Cold Air Intake, with long tube headers flowing into 2 1/4" dual exhaust.

Knock Retard is not good.

VE fuel is close.

A few more TunerPro RT data logs needed.

dave w