scalbert

As a preface, I recently put the MBC/TCD in on my AWE Stage 3 kit as there is no noticeable difference in the part throttle fuel trims with out without the N75 controlling everything. I am getting about -12% on both banks on part throttle trims; whereas idle trims are near 0% and this is both with and without the MBC/TCD. This was driving me crazy and thought maybe the MBC combo was causing it; well it isn't and now I'll keep searching for the reason.

With the MBC back in place and set for 23 spike to 20 - 21 by redline, I had added 5% Primary (and yes, the part throttle trims went to about -17%, but the idle trims hardly changed) as a caution until I got the wide band numbers. It turns out it wasn't needed as per the below wide band logs. I was dipping into the high 10's by redline in both 2nd and 3rd gear pulls. I set the Primary back at 0% and made a couple of more runs. The A/F ratio interestingly changed by about 0.5 points (5% change equated to about a 0.5 A/F change, convenient but most likely not linear).

I need to get some timing logs as well as CF logs before making any other changes. But if CF's are low I may pull a little fuel to get the A/F numbers ending at about 11.75:1. That would also bring my part throttle trims closer to 0, about -10% to - 9% I suspect. I hope to get these logs in the morning as I started to this evening but ran into a little trouble.

I was driving tamely to cool everything down when I goosed it in 2nd just to check that IAT's dropped quickly (they were at about 60C after sitting in the garage for about 30 minutes). About a mile down the road and nearing my testing spot I see blue lights behind me. The Cherokee County Sheriff's Department vehicle pulls into the parking lot right behind where I pulled in for him. He walks up and asked if I knew the speed limit to which I replied I did but didn't think I exceeded it. He said he and another patrol car were a couple cars back and knew I had definitely exceeded the limit but he was going to just give me a warning (don't think he had a reading or any real judgment of speed). Nice guy regardless and glad it turned out the way it did. Regardless, that was the end of my night as one strike in an evening is enough.

Anyway, the logs are grouped by gear. The first set are the 2nd gear pulls and the second set are 3rd gear pulls; the first in each group is with 5% Primary added, the second is with 0% Primary.

<b>2nd Gear</b>
<img src="http://www.flwse.com/images/steve/Audi_Tech/WideBand/WBO2_2nd_11052006A.JPG">

<img src="http://www.flwse.com/images/steve/Audi_Tech/WideBand/WBO2_2nd_11052006B.JPG">

<b>3rd Gear</b>
<img src="http://www.flwse.com/images/steve/Audi_Tech/WideBand/WBO2_3rd_11052006A.JPG">

<img src="http://www.flwse.com/images/steve/Audi_Tech/WideBand/WBO2_3rd_11052006B.JPG">


I did have a short log in end gear of 003 but there isn't really enough data to tell much. I suspect my timing would have ended near 15 degrees had I taken it further. It also loks like the MAF readings would have gotten into the mid-280's had I hit redline.

STAMP /min g/s % °ATDC
32.55 4720 226.64 100 8.3
32.88 5160 248.42 100 5.3
33.23 5560 262.17 100 6.8
33.59 6040 271.44 100 8.3
33.98 6480 277.31 100 11.3