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Old 01-09-2012, 05:38 PM   #1
BlazeRex
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Default Question scaling injectors

I'm fairly new to tuning so bear with me, but I have a car with a stock intake but STI pink injectors, and the car is a 2002 WRX with a 2003 ECU.

Today, I went out to scale my injectors and this is what I found:

I have them now so anything above 1.7 V on the MAF, I have +/- 1% combined fuel trim error, but from 1.5 - 1.7 V I see as low as -5% correction, and lower than 1.5V, I see 3% correction.

Also, right after starting up the car, even if it is already warm, I see around -22% fuel trim, which is very strange. But once I drive around and let it idle, It sits around 3%.

Any input would be greatly appreciated, thank you in advance.
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Old 01-09-2012, 05:52 PM   #2
renosubby
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sounds fine to me, I like to be within +5,-5%
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Old 01-09-2012, 11:38 PM   #3
BlazeRex
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True, and I'm very happy I have it scaled very nice after 1.7V on the MAF, but just thought it was weird that corrections go positive, then drop negative, then level out perfect. I was just getting afraid something like an O2 sensor failed or had a bad injector.

But at least that's reassuring hearing that the +/- 5% overall seems to be in spec.

Also, any comment on the -22% corrections upon startup?
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Old 01-12-2012, 12:26 AM   #4
Kastley85891
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Ur just dumping fuel on cold start by the sound of it.. prob settles as temps stabilize and idle goes to normal rest?

What settings did you use for your pinks?
I run a stock intake but still scaled my MAF to get <2% trims, they will fluctuate from time to time but TBH if you are 5-7% I would not loose any sleep
Hows your WOT fuel?
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Old 01-13-2012, 07:31 PM   #5
Phatron
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if you rescale the maf so all your corrections are the same way (IE all positive or all negative) then the car will drive smoother.
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Old 01-15-2012, 08:50 PM   #6
BlazeRex
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Quote:
Originally Posted by Kastley85891 View Post
Ur just dumping fuel on cold start by the sound of it.. prob settles as temps stabilize and idle goes to normal rest?

What settings did you use for your pinks?
I run a stock intake but still scaled my MAF to get <2% trims, they will fluctuate from time to time but TBH if you are 5-7% I would not loose any sleep
Hows your WOT fuel?
Yeah, the corrections are not too bad, I'm just really anal with things like this, so I like to have it as close as possible.

I have the injectors scaled at 560cc and .8 latency at 14V, thats the best I could get it so all my corrections were close enough to zero.
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Originally Posted by Phatron View Post
if you rescale the maf so all your corrections are the same way (IE all positive or all negative) then the car will drive smoother.
Thanks for the tip! I will try scaling the MAF and see if that helps, I was just making sure there wasn't another issue I was missing.
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Old 01-15-2012, 10:40 PM   #7
sorrowfulkiller
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Scaling the maf is the only way to get the injectors to function perfectly like you want them to. although +-2.5% is not really any fuel in the scheme of things.
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