why dont people use closed loop for racing. For example, set the ideal a/f ratio to be whatever (12:1~13.1:1) and have the ecu adjust in real time? Or why not have manufactured cars use closed loop all the time; in WOT, have the car dialed at a richer mixture, but cruising at 14.7:1 but always remaining in closed loop with a wideband o2 or something?

 

Power.... the only time a stock engine will come out of closed loop (after it warms up) is wide open throttle. Closed loop is not designed for optimum power... its designed for acceptable power and lowest emissions.... however at WOT emissions are of little concern, and the engine dumps as much fuel as possible, based on a fuel curve/map. This is a predetermined amount, and it is very rich, and gives the most power possible.

 

But if you have a closed loop at WOT, you wouldnt need to have your engine tuned for whatever changes you make to your car since your car can make adjustments on its own?

 

some people dont just drag race. there are alot of people on here that do nasa/scca road racing events and most of the timr we are wot but alot of the time we are 75% or less through turns. but i get what you say

 

if you have a turbo charged car, at partial throttle, is it safe to have a 14.7:1 a/f ratio?