I am currently running a GMPP 5.7L Vortec 330hp Tpi with 52mm throttle body, headers, MSD 6AL, stock computer, stock injectors in a 1989 MAF GTA. I am having trouble figuring out if I should purchase the 21lb injectors or the 24lb. Would any of these changes require computer reprograming? Or shoud I just stick with the 19lb injectors. I've done alot of searching but havent found a direct answer...any help would be greatly appreciated...also If left any important info out please ask....thanks again

 

I'd step up to a 26# injector. Considering the TPI will probably choke the motor a little on the HP side, you'd probably be safe with 24#ers. Definately too much HP for 19# injectors.

 

will I have to reprogram or burn another prom for my computer if I use the 24lb/hr Injectors? or will it run normally and not overly rich. I'm also not running an EGR at all, and no CAT.

 

You will need a new chip burned.

 

I'm currently running 24# injectors with the stock 43.5 pound pressure. My duty cycle is at 80% at the highest point. I'm at the 330RWHP mark. However with my next round of upgrades I will be going to the 30 pound injectors as I'm getting close to the limit of the 24# injectors.

 

How can I learn about chip burning? is there any sites or books that list the programs and hardware needed to accomplish this? Since I definately want to step uo to at least the 24lb injectors. As far as burning the new chip what has to be changed? is there a default program I can use?
I'm new to chip burning so any help would be extremely appreciated. Thanks Again

 

Check out the DIY PROM section of this site.