Bad Missing Tooth Wheel
Posted: Wed Jun 13, 2012 3:56 pm
The other night while Peter was running engine number 12, about which he's yet to post, he was having some sync troubles. He first tried moving the sync setting for missing teeth setups to the max sensible value of 2048. No luck. We then got a freeems bin log and saleae LA log from it. The bin log was amazingly consistent, rise in RPM, desync, resync, rise, repeat. The screen shots are below:
That's the wheel involved, post machining, pre tests. Before machining it had pointy triangle teeth. DIYAutoTune sell them that way. :-o
The values for the stretch before during and after missing from the LA screeny are here:
If we look at the ratios from one to the next we get:
As you can see, things don't look right.
What should be close to 1:1, 1:1, 1:1, 1:1, 1:2, 2:1, 1:1, 1:1, 1:1, 1:1 is wildly different. The trouble isn't the slightly wider missing, it's the combination of wide missing and narrow post missing. If you compare the long with the average you get ~3.8, but if you compare the wide with the narrow after it you get ~10 :-o
Sure as the sun will shine tomorrow, the error code was: 66, or TooWideNarrow which I've aliased to the name noiseAppearedWayTooEarlyAsIfItWasAVRToothButWasnt because that's the most likely cause.
DIYAutoTune FTL.
Fred.
That's the wheel involved, post machining, pre tests. Before machining it had pointy triangle teeth. DIYAutoTune sell them that way. :-o
The values for the stretch before during and after missing from the LA screeny are here:
Code: Select all
2.9120625
2.82475
2.772
2.8385
7.3986875
1.9526250
3.1124375
3.012
3.0403750
As you can see, things don't look right.
What should be close to 1:1, 1:1, 1:1, 1:1, 1:2, 2:1, 1:1, 1:1, 1:1, 1:1 is wildly different. The trouble isn't the slightly wider missing, it's the combination of wide missing and narrow post missing. If you compare the long with the average you get ~3.8, but if you compare the wide with the narrow after it you get ~10 :-o
Sure as the sun will shine tomorrow, the error code was: 66, or TooWideNarrow which I've aliased to the name noiseAppearedWayTooEarlyAsIfItWasAVRToothButWasnt because that's the most likely cause.
DIYAutoTune FTL.
Fred.