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Old 01-10-2007, 03:57 PM   #1
jvcjbl
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Default Stock STI Idle Fuel Trims LTFT & STFT

I was wondering at idle what should a bone stock STI (2006 if it matters) LTFT & STFT be? Can anyone help... I have done tons of searching and found nothing for LTFT & STFT at idle for a BONE STOCK STI. Thanks in advance
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Old 01-10-2007, 04:14 PM   #2
AZScoobie
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It should be with in -25 and +25%.

There is no "stock" setting for this. Its active and will vary depending on temp, Altitude, Fuel brand and content.

Most of the time the Short term should be near 0 most of the time. The Long term will have less then 10% plus or minus. If the long term pegs out either way to the max of 25% it will throw a code.

When tuning the car its best to get both at 0. I like to have the long term a touch negative.



CLark
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Old 01-10-2007, 04:23 PM   #3
jvcjbl
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I was battling a problem with a P0171 with my intake... comes to find out I had a leak in my catch cans. Spliced the lines back together (bypassing the catch cans) and my STFT stopped being a constant +25%... my LTFT with and without the leak fixed was +14.8%. Is that normal... the STFT is switch around 6%-8% last time I checked it... I will check again... INJEN is working with me on prototyping and intake and so that is why all the sudden attention to my fuel trims. I am going to pull off the intake (their request) and put back on the stock box and let the ECU relearn what is going on for a new base... gotta go back there Monday so it should have learned for sure by then.
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Old 01-10-2007, 05:23 PM   #4
TMessick
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If you go steady-state long enough, yout STFT will be something like +-5%. Typically, any sustained non-zero values in STFT get learned into the LTFT, so a sustained positive STFT should make the LTFT creep up. On a stock vehicle, I'd expect LTFT to be +-7% or so nominally, but wouldn't worry if they are +-10%.

That said, I don't have a good enough feeling for the Scooby system to know what "typical" values are, i.e. I don't know what kind of adaptive shift the stock ECU normally gets.....
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Old 01-10-2007, 05:52 PM   #5
AZScoobie
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Your intake is a POS. As a result of the larger tube of the intake kit the MAF sensor sees less air. In your example the ECU is adding 14 percent fuel. You will benifit from having the ECUs MAF scale table remapped to offset the skewed load reference you now have with the intake.

Clark
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Old 01-10-2007, 06:51 PM   #6
jvcjbl
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Quote:
Originally Posted by AZScoobie View Post
Your intake is a POS.
You obviously didn't know... this intake was a prototype... not the one that is currently out... they are tailoring this intake specific for my car... not the STI.. my specific vehicle. Either way... seen all the dyno reports with my very own eyes and saw the 30hp gain they claim on 6 separate vehicles. Call it B.S. but I can easily get the dyno sheets from paul or byron if necessary. I understand that it is in total ideal conditions but whatever saw about 75-100 different dyno pulls. They were showing me how much research that put into the intake design and how much time they spent with the STI. Anyway, I Took off the I/C and looked around...everything looked good... noticed upon removing the I/C that the hose from the intercooler to the turbo (red angled hose) was loose on the back side of the I/C... must have been from me last time (months ago) having the I/C off. I found a few other hose clamps loose and tightened them accordingly. I reinstalled the stock air box and checked the fuel trims. The LTFT is +5.5% and the STFT is switching from 0.0% to +0.8%... a lot different than before. I can't account for the change because of the removal of the intake but the turbo hose was barely hand tight on the clamp. Either way... appointment with Injen Monday and they are re-dynoing my car and redesigning the intake until they are happy.
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Old 01-10-2007, 06:56 PM   #7
Zumble
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Love how Clark is so delicate... =)

Quote:
Originally Posted by AZScoobie View Post
Your intake is a POS.

Clark
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Old 01-10-2007, 06:58 PM   #8
jvcjbl
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Quote:
Originally Posted by Zumble View Post
Love how Clark is so delicate... =)
Doesn't bother me... I really appreciate his input and I totally respect his view. I just have first hand experience with the company that only a handful have gotten to experience. So I know a little more of behind the scenes (per say) than most.
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