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Old 11-22-2012, 06:03 PM   #1
myk
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Default Injector scaling/latency issues. 880cc yellow sidefeeds.

Helping a friend get a basemap going for his 05 legacy GT and I'm having some issues with getting the latency/scaling values for these injectors he purchased. We've attempted to use the romraider injector tab and it keeps giving us 1000cc+ values. I'm guessing this is because they are modded stock injectors. The latency values it's giving us are pretty bunk as well, the car would hardly idle.

Stock intake, inlet, filter and snorkus so I don't think maf scaling is the issue. Only real mods are vf52, GS crossover, uppipe, and downpipe. (stock catback still)

Just using guess and check I managed to get the combined A/F correction #1 and A/F learning 1 to be less then 5% at idle. I don't have the learning view saved (will upload tomorrow) but it looks alright to me though I don't think he has done enough driving yet. Issue is once we start driving the correction goes crazy all over the place :/


This is all that came with his injectors.



Scalar at 840cc

Code:
6.00	9.00	11.50	14.00	16.00
5.09	1.91	1.14	0.80	0.67
What should be my next steps?
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Old 11-23-2012, 06:56 PM   #2
myk
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Bump, going to work on the tune some more tonight. Anyone have advice?
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Old 11-23-2012, 07:55 PM   #3
BlazeRex
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My best advice, use the maf tab to scale the injectors.
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Old 11-23-2012, 10:32 PM   #4
bjohnson_55
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Quote:
Originally Posted by BlazeRex
My best advice, use the maf tab to scale the injectors.
Terrible advice.
Just graph your corrections in a scatter plot over maf voltage. Make a linear trend line.
Scalar affects fueling globally more than latency. So if the trend is linearly above 0% change scalar.
If the slope is not 0, change latency.
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Old 11-24-2012, 12:40 AM   #5
myk
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Quote:
Originally Posted by bjohnson_55

Terrible advice.
Just graph your corrections in a scatter plot over maf voltage. Make a linear trend line.
Scalar affects fueling globally more than latency. So if the trend is linearly above 0% change scalar.
If the slope is not 0, change latency.
Just log correction 1 during a pull while logging maf voltage as well?

Dropped the latencies to near stock and upped the scalar to 930 per using the injector tab on rom raider and the car is running much better, B C and D learned corrections were .9 .4 and -.2. A was +10 though.
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Old 11-24-2012, 09:47 AM   #6
BlazeRex
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Quote:
Originally Posted by bjohnson_55 View Post
Terrible advice.
Just graph your corrections in a scatter plot over maf voltage. Make a linear trend line.
Scalar affects fueling globally more than latency. So if the trend is linearly above 0% change scalar.
If the slope is not 0, change latency.
Terrible advice?... What do you think the MAF tab is?...

Notice I did not say "Scale your injectors by making up for it in MAF scaling". THAT would be bad advice.

He was using the injector tab, thats the wrong tool. The correct tool is the MAF tab.
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Old 11-25-2012, 03:28 AM   #7
myk
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Hmmm, how would one go about using the maf tab to scale injectors?
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Old 11-27-2012, 09:10 AM   #8
BlazeRex
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Try and get the corrections as close as you can with scalar
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