Thread: Tuning help

when i did my injector swap to 42's i over shot the values and was pig rich, wb literally said rich, like hey to much gas!!! im past showing you a # lol

car was a total dog, got them dialed in and night and day difference.

So what are the point of the fuel trims if only a wideband can tell you if your to rich or lean? All I have to go off of is the o2 on the aeroforce some people say it's acceptable for what we are doing and some people say no idk everyone has there opinion I guess.

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ive tuned using the ltft and no wb. then got a wb and i was in pretty damn good shape showing a low 11 wot. 11-12 a/f is rather safe.

Scotty if you had to guess what would my afr be? You think it's rich? Idk my o2 reading is 945 at wot

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its defiantly rich, how rich is a guess.

if you have the 3.3 pop it on. if its kr free on a hot day keep it.

There is nothing there to prove it's rich. All the 945 is telling you is that it's richer than 14.7:1.

It is not accurate at all. It could be 7:1 or 13:1.


The point of fuel trims are to help cars run properly in different conditions. The air changes due to weather, elevation, engine maintenance. Etc. The trims are showing you how much correction is required to keep it at a stoich mixture.

Just because the car doesn't lock onto 0 at wot, doesn't mean something is wrong. It is just estimating how far off the fueling is, since it has no idea what that actual afr is at wot. (Because narrowband o2's are not accurate or consistant when the mixture is not stoich.)