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Do I need a tuned PCM.

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....
 


darkhorizon said:
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....
Click to expand...

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.
 
GTPSHAWTY said:
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?
Click to expand...

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.
 


HP Tuners software or other scan software, aeroforce gauge, or Torque (android app) + bluetooth or wifi OBDII reader
 
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.
 


torque has had functional KR scanning for GM for awhile now. At least a month it's been working for me. The app works better with a quality OBDII reader but my cheapo ebay has told me what i needed to find out...that i STILL have KR...lol
 
do any of the iphone options support KR? if not it's pissing away money as far as im concerned cause that's the most vital PID to have access to for these cars.
 


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
 
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