Quote Originally Posted by GTPSHAWTY View Post
ok i understand... soo yall tellin me if i just put the 3.4 without a tune on the car it will lack power and if i get the tune it will be almost the same as the 3.8?
Sorta... if you have enough to support it (nobody can really say if you do or dont, would have to scan), then you should be able to run a 3.4 on a stock pcm and make as much power as you would on a not stock pcm... most stock PCM stuff I see has good WOT AFR... and not many people run more than stock timing.. so I dont see where you would make power by "tuning" it. You may make it richer to fix knock, but you would be making it slower the more fuel you add.... how much slower i dont know.