Running Lean mid revs..?

[vaudiw]

I have taken the following log and it appears that between 4700 and 5700 the car is running lean (O2 volts below 0.5). The rest of the rev range looks to be OK.

I have also been getting a small hesitation at about 2800 and again at 3800. It was serviced recently and there was a bloggage in the pipe to the N75 and they replaced an air pressure sensor. This has helped abit.

Log 4 shows Boost - looks like it is getting what is being asked for so no leaks?


Any suggestions on what I should be checking. I've got a track day on Fri so just getting abit nervous...

[Blue_Thunder]

Not sure how reliable the O2 sensor readings are. The tuners always use a wideband lambda to measure AFR.

[vaudiw]

Car ran well at the track day, didn't melt so can't have been too lean

Brakes are crap. They just get sooo hot that they melt the pads, which at $450 per set makes an expensive day. Seems if I just keep them cooler they would be ok...