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Old 05-06-2013, 12:16 AM   #1
Scooby Newbie
Member#: 305314
Join Date: Dec 2011
2010 STI

Default sti self tune

my friend just received his power commanders for his 929rr

power commander V got a feature of self tuning, using wide band sensors it's tuning itself

is there anything like that for our cars???

it would be awesome,

you set more boost and computer sees it and gives more fuel, pretty much you wouldn't have to spend few hundred bucks for tune session every time you put new upgrade

what do you guys think
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Old 05-06-2013, 08:59 AM   #2
Scooby Specialist
Member#: 73884
Join Date: Nov 2004
Chapter/Region: International
Location: Naples, ITALY
2005 STi
2006 Evolution MR


Originally Posted by boczo777 View Post
...you set more boost and computer sees it and gives more fuel...
This already happens with your car. [Unless you max out the MAF, but that is a different story]

Originally Posted by boczo777 View Post
...pretty much you wouldn't have to spend few hundred bucks for tune session every time you put new upgrade...
You do not need a new tune just because you upgrade something. Yes, certain parts require a new tune to work, but not everything is like that. [You can also spend that few hundred bucks once and tune yourself.]

Originally Posted by boczo777 View Post
...what do you guys think
I think that you should tune the car yourself if you do not want to pay a professional to do it. There is A LOT of information, for free, on the internet [not just NASIOC, either] that will help you. If you have an AP, download ATR [this is free software from Cobb]. If you do not have an AP, either buy one or buy a Tactrix cable and use open source software.

Start learning how the ECU works and what changes Cobb did [assuming you have an AP, all of the Cobb OTS maps for your car are free] for the different OTS maps [stage 1, stage 2, etc.]. When you feel that you have learned enough, try making some small changes [one a time so it is easy to track] to timing, boost, fuel, or AVCS and see how that affects the engine. Remember, small is a relative term to what you are referencing it to. For example, timing is adjusted in 0.35 degree increments at a time but AVCS is adjusted in 1 degree increments. Boost can be adjusted to ~.02psi but you will certainly not see a difference between 17.00 and 17.02 psi target boost. You might induce knock with 0.35 degrees more timing though.

Tuning is not hard, it just has several aspects that work together so there is a learning curve associated with it. You are basically balancing timing, boost, fuel, and AVCS to work together in harmony with the specific setup for your engine, type of fuel, and physical location [altitude, temp, humidity].

At a minimum you need a wideband O2 sensor and one of the programs mentioned above to tune the car yourself. If you are not comfortable with tuning yourself ... pay a professional and be happy.

And, by the way, your car already "self-tunes" by using AF Learning, FBKC, FLKC, etc. Not exactly the same, but it is probably closer to the same then you might think.

Last edited by jebjkey; 05-06-2013 at 09:07 AM.
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