I'm looking into this from a hobby/curiosity standpoint, and NOT a "big HP gains" standpoint. Would there be advantages to adding a wideband O2 sensor and some piggy back fuel controller (or something) to more accurately create a proper mixture?

I noticed that the n/a car goes open loop if I'm doing anything more than 2/3 throttle. Besides pollution and wasting fuel, is there any draw back to a rich mixture?

Would the wideband O2 system have a faster reaction time for adjusting mix, and thus more efficient fuel usage and power?

Apparently LEV2 vehicles are almost achieving wideband O2 functionality while still using a traditional cheaper narrow band O2 sensor by having a faster close loop process for adjusting fuel.

Just pondering. Inputs?

 

If it is a stock car, which I am assuming it is, then there is no reason to be messing with the stock fuel maps. They are set to run a tad richer than stochiometric for safety reasons.

You don't want to run too lean or you will encounter detonation and you don't want to run too rich because it will waste gas and possibly foul the spark plugs.

I don't understand why you would want to do all this work for a stock car that has it's fuel maps set at an optimal point in terms of gas mileage and safety.