Originally Posted by Sunriseinla (Post 5768078)

Sal,

A switching O2 sensor in closed loop control will always give you stoich conditions. For 100% gas that would be a AFR of 14.7 and for E10 that would be AFR of 14.2.

If I take a 3.2 with factory chip meant for 100% gas it will run 3% lean in open loop with E10. The closed loop control will richen the mixture by 3%. If you have changed the calibration to compensate for E10. You can connect the O2 sensor and it will fine tune for the correct AFR of 14.2.

Cheers
Mark

Originally Posted by scarceller (Post 5767886)

I tend to agree, if you move the plunger 2mm up at 1000RPMs it will also be 2mm up at 5000RPMs. My bet is it will have a large effect on AFR not only at idle but also at WOT. Easy enough to prove with a WBO2. I had this same exact debate on the motronic AirFlowMeter. In the the AFM you can adjust move the wiper arm slight up further on the track (not the spring tension). If you move it up 1mm you just enriched mixture across all RPMs. I proved this by testing the theory on my car with my WBO2.

Originally Posted by sylvester (Post 6042339)

hi.. i have a 79 porsche 911 sc cp with no catalytic converter i bought it like that. it now has a very strong exhaust smell coming from the tail pipe. im also wondering if its running to rich are that just the way it smells when the cat is remove please help me thanks for you help.