Wideband, stock o2, questions

[Jaxx_]

Sounds kinda lean sir. 14-15 afr readings under load are lean even for NA.

I run 13.1 at WOT on my table, it goes there from 14.7 at 80kph and from 15.5 at cruise. It's about 14.7 at idle.

What size are your injectors, EthirtyIS? I'm betting they're at 100% load and can't deliver enough fuel. You are going to burn a hole in a piston at those AFRs with any serious load. I would pull your spark plugs ASAP to make sure you don't have signs of detonation.

[jaywood]

I need a new laptop battery. These Afr's fly by me. I can't focus on a gauge and driving at the same time.

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[Jaxx_]

I need a new laptop battery. These Afr's fly by me. I can't focus on a gauge and driving at the same time.

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i either log, have someone else drive, or stick to 3am wednesday night on the highway to do my tuning.

[EthirtyIS]

Yea, right now I'm on stock injectors, with everything stock, except an fmu. I just got my hands on 21 lbers, and a Walbaro 255, I'm in the middle of getting an apexi safc, then I just need a tps, and I should be set to tune everything up. I'm aiming for 14.7 idle, 14.7 at cruise, 12.5-13 WOT.

[Jaxx_]

you shouldn't tune for AFRs on idle, tune for lowest vac value

[einstein57]

you shouldn't tune for AFRs on idle, tune for lowest vac value

That's contrary to pretty much every FMU write up i've ever read. But spot on for every standalone write up i've read.

[jaywood]

that's contrary to pretty much every fmu write up i've ever read. But spot on for every standalone write up i've read.

+1

[nando]

That's contrary to pretty much every FMU write up i've ever read. But spot on for every standalone write up i've read.

no, he's correct. to get the best idle quality, you should tune for the lowest load at idle, not for an AFR. AFRs are always secondary. if you want to target a leaner AFR, you can, but idle quality will suffer. the trade off is up to you.