As a side bar, I've been scratching my head about this one... It seems like a whacky idea but it comes from a MB mechanic that races with our group...

With regards to the fueling / timing retard that the ECU forces stoichiometric AFR of 14.7:1 on this car no matter what... It was recommended, as a "cheap" timing / fueling "trick" to allow a small bit of air into the forward 02 sensors which will trick the ECU into richening the mixture and advancing the timing...

Since we know that the front 02 sensors are directly responsible for the ECU timing / fueling adjustments, what's your opinion ? It seems like a crazy idea, but it also sounds logical...

It was suggested that I install a small bung, (1mm) with a tiny tube adjacent (upstream) of the L&R sensors in bank 1 that will create a small vacuum of air from the tube caused by the exhaust gasses and be blown directly onto the sensors... This will in-turn "trick" the ECU into richening the mixture and advancing the timing...

I think it's a crazy idea but I saw this little thing installed on a TurnerMotorSports race BMW...