AFR at low rpm with large cam

[Bill00Form]

Most everything I read says that you are shooting for the stoich ratio when tuning but then I also read that at low rpm large cams tend to have unburnt gas so the afr reading appears to be lean when its not.

When tuning is there a general guide as to what the AFR should be at low rpm. Also, what range of rpms and MAF hzs are effected.

Thanks

[joecar]

That is correct (unburnt fuel = unburnt oxygen = lean reading on wideband).

Tune for the lowest MAP (i.e. the most vacuum).

[wesam]

That is correct (unburnt fuel = unburnt oxygen = lean reading on wideband).

Tune for the lowest MAP (i.e. the most vacuum).

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[Bill00Form]

Thank you Joe!