I plan to put my 403 into my 04 automatic GTO and I'm also new to HP Tuners.

So far, I understand that I have to pull up my old tune, adjust the cylinder volume which per Marcin's spreadsheet is now .82576, set the engine type to OHV 6.0 and adjust the injector flow rate again using Marcin's spreadsheet. Anything I'm missing to get it safely started without screwing anything else up?

Also, does anybody have a 402 or 403 tune I could study to get a better understanding of HP Tuners?

Thanks in advance,

Roy

 

Anybody????

 

That should at least get it started. Depending on the cam, it still might run like dawg pooh.
Did you try the hptuners tune repository for a base line tune?
Sounds like you're doin your research. Keep on and good luck!!

 

To make sure it doesnt run out of fuel at WOT, you could multiply the whole VE table by 1.1 or so for the first start/log.....