Thread: Do I need a tuned PCM.

Originally Posted by darkhorizon

Most any street tune I see done by random's anymore are WAY too complicated, and usually end up with too many changes that are later completely negated by the narrowband O2 sensor....

I have never been able to tune power into a "base tune" with any car I have built and taken straight to the track (commonly what I do... get a good base tune on a car, maybe flash it once after a test drive.. then go straight to the 1/4 mile track in town to dial it in). Every time I was able to make some safety adjustments or some small tweaks, but nothing ever increased the quarter mile performance over the base tune.... A base tune will always have a stock maf table....

the closest track is three hours away

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?

it is unsafe to just put the 3.4 on without supporting mods and some kind of tune. it will likely blow up something in the bottom end. the problem with a canned tune (one from a vender) is that every car is different, so you might still have some knock with the pcm. custom tunes will be able to get rid any knock you still have and then even add some timing if you are able to.

anytime you do any major changes the way to the way the engine flows, throttle body, rockers, headers, etc, you should retune so that it flows right.

Originally Posted by Jbruce

What do I have to do too find out if I have any kr?

that was my nxt question

When I had the basic 3.4 setup with headers. With the dhp tune that was on my car, I was seeing 4-5 degrees of kr. With my custom wideband tune I got 4 more degrees of timing out of it and 0 kr across the board. If you ever plan on going farther with your car, get a tuner or find someone that knows how to use one.

does the torque work now? i heard that it didn't

Originally Posted by Jbruce

Do you happen to know if I can get a scanner for the iPhone?

yes you can, innovate makes it, the app is free but the adapter is pricey but much better than the android one in my opinion.

gtpshawty are you deleting your egr with your headers?

I think You need to do a case learn, but Im not for sure I think I have heard of people doing it with out one, I'm not sure what would happen if you did. I'd like to know the answer to this to cuz I might pick oneup today

Im not exactly sure. something you get done at the dealership, or i think they can be done on some scanning devices, where the car is reved to different rpm's. But im not 100% sure lol