Megasquirts Auto Tuning

[Alex1380]

Has anyone tried using the Auto tuning bit of Tuner studio?

I gave it a quick go and well... it fecked me car right up! Went back to the map i had used in the morning and it would only just run, as soon as load was put on the engine it would go massively lean and stall even though it has been running fine. I've not idea what the autotune thing has done but its really messed things up.
I don't know now if i should try it again and hope it will correct it own mistake with some driving around or to give up and start again tuning myself.

I really can't understand why gone back to the original map didn't fix the problem.

Cheers

[joostvdw]

Apparently you need a proper AFR target map first (you can have a global one generated online), then make sure your lambda lag is correctly set (it takes some time for the exhaust gasses to reach the sensor, so it will need a certain delay in order to adjust the correct cell in your mapping) and then it's a matter of reaching all cells in your mapping to get it to work. You'll need to smooth it by hand afterwards, but the general line should be oke.

[vitesseefi]

Auto tune can work like magic when used properly but:

1.
You must have a wideband lambda sensor and controller which is properly matched to the ECU so the ECU (and Tuner Studio) can see what is going on.

2.
You must have a sensible AFR target table to give it a reference to work to. If starting from scratch then you could do worse than set the whole table to 13.5 apart from 4000rpm at full throttle which needs to be 12.5 and then drive around and let it sort itself out, starting very gently and working up. THis'll give you acr that drives well but you'll want to lean it off a bit in low load and cruise areas to improve economy.

Nick