AFR Issue

[JAAY]

Yes I am leaning out the mixture to a safe ratio. I'm on the factory ecu with a 996 program. The fuel controller on kicks in at a selected throttle point but like you said even at that there will be no adjustments until you really get on it and it goes into open loop.

[san rensho]

Originally Posted by JAAY

Yes I am leaning out the mixture to a safe ratio. I'm on the factory ecu with a 996 program. The fuel controller on kicks in at a selected throttle point but like you said even at that there will be no adjustments until you really get on it and it goes into open loop.

Ah, so at some point the fuel management goes into open loop. That explains it. So these "$69 Miracle Chips that give you 60+ HP" ads are onto something, because all they are is a resistor that splices into the MAF and supposedly leans out the AFR at high loads?