whats is a good range afr # at wot

Depends on fuel type...................my unleaded oxygenated fuel likes richer #`s like 12.2-12.4 so far and the plugs say the same...........

As already said it depends on fuel type, open exhuast versus closed exhaust, which sending unit, where located and metering unit. The best bet is to jet for best MPH at the 1/4 track and then record that AFR number for those weather conditions Ball park #s on pump gas with closed exhaust work well in my car from 12.3 to 13.3 depending on the weather and fuel brand and type Richer always feels better as far as throttle responce, that is not nessecarily the best AFR #s for best performance at the track