Air fuel code for scangauge

JvKintheUSA

Thanks Mod! Did a quick highway run and it seems that the coding on the Scangauge was incorrect. On the setting that you provided, I now read an A/F ration at WOT of 12.8 to 12, depending on RPM. Long term fuel trim stuck at 34 though..another issue I guess?!

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Modshack

OK...Good! JB1 needs to fix his too..

On the LTF's, I just checked the coding on mine and it is on page 1, CANXX, TXD 07E00107 Yada yada. Double check your entries..

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JB1

Done! Thanks a lot Modshack!

I switched to the Bank 1 / Sensor 1 setting and It now shows a "proper" rich ratio of around 12~13:1 on open loop Opperation. So I guess the "general" setting is not the right one for our cars and that 17.5:1 reading in the "general" setting is indeed some kind of default. BTW, my long term fuel trim shows -8

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Jordo!

That's a relief! That's perfectly safe and not too far off from the likely best torque AFR (varies from motor to motor, but something around 13.2 is generally ideal N/A).

Congrats!

If you want to learn more about this stuff, I highly recommend you pick up the following text:

Amazon.com: Engine Management: Advanced Tuning (9781932494426): Greg Banish:…

It really spells out all of the basics with some clear information on more advanced topics. It will help clarify what the scanguage is telling you.

Also, regarding fuel trims, note that there are most likely multiple trims --one associated with each cell in the fueling map (which you probably can't access) or at least a block of adjacent cells; cells are graphed by load (based on MAF value and known engine displacement) and RPM.

Short term trims (based on vacilations around 14.68 AFR / narrow band .5 volts) are averaged to create long term trims. One of those is probably carried into open loop (can Modshack confirm or refute that?)

The LTFT of +34 may or may not be a cause for concern. So long as driveability is fine, AFR's in WOT are fine, and the CEL light is off, it's not ideal, but acceptable (ideally, you'd want to have th ecar tuned so that these are all in the single digits and driveability is excellent).

Man, I can't wait to start playing with uprev on this car

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JvKintheUSA

+1 for that info! Thanks!! I might do an UpRev tune or get a Cobb Accessport one of these days.

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Modshack

I don't know how sophisticated Uprev is, but when I had the HP tuners program for my LS3 corvette virtually every parameter in the areas of fuel, timing, temps etc was programmable by minute blocks within the program. The chart below is the high octane timing table. Each block can be manipulated. You also had MAF scaling which, in conjunction with the logging function and a wideband A/F gauge, allowed very precise tuning. It's my understanding that the Long term trim corrections are added to the WOT fuel map. This is why the reported A/F's (with the correct SG readings) are slightly rich...
Rich is better (and safer) than lean but doesn't make quite as much power which is why custom programming will show increases.

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