TTS: O2 Sensor Crosstalk
Outstanding HDF Member
Joined: May 2007
Posts: 2,304
Likes: 31
From: Florida
easy Doc, I didn't say it didn't exist I simply said it exists a LOT less than is made to believe by reading some of these forums where it happened to one bike out of 2000 and then it becomes the defacto standard because one guy said it, all others jump on the bandwagon, and now they all do it. That's not the case by any stretch of the imagination.
Doc
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Road Master
Joined: Sep 2009
Posts: 1,180
Likes: 33
I want to thank everyone for at least talking about it. I have a bunch of datamaster recordings and was sincerely hoping that there would be a way to see that I had it or not, or how bad and where it was happening.
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Road Master
Joined: Sep 2009
Posts: 1,180
Likes: 33
No it's not made up or just in our heads......cross talk DOES exist. it is very easy to identify in the lower RPMs (750 to 3000). The evidence is in the report from V-Tuning, you do your first iteration and all looks well for the first go around, the second time through you will see abnormal readings like where I had white cells the first time I have dark red or dark blue. These abnormal readings usually are in and below 3000 rpm. This is a good sign that the 02 sensors have lost control in the lower rpms.....yes the bike will run there, and to a novice, he/she, can't tell the difference however, to a tuner with high standards, that want that flawless smoothness, from a good tune will not get it because the fuel delivery is NOT correct or accurate where you cruise all day long.
Adding a cam, even a small cam, with a little over lap, or a 2.5 baffle in the mufflers, will enhance the cross talk. If you know what to look for you will see it with NO problem. If you're not used to running a great tune it probably won't even bother you, but just because you can't see it or feel the surging and rough running, doesn't mean it doesn't exist. Improper fuel delivery, anywhere in the map, will cause problems in the long run.............so whats in your wallet......a good tune, or a good enough tune?
Adding a cam, even a small cam, with a little over lap, or a 2.5 baffle in the mufflers, will enhance the cross talk. If you know what to look for you will see it with NO problem. If you're not used to running a great tune it probably won't even bother you, but just because you can't see it or feel the surging and rough running, doesn't mean it doesn't exist. Improper fuel delivery, anywhere in the map, will cause problems in the long run.............so whats in your wallet......a good tune, or a good enough tune?
Thanks for the insight. I went back to 7 V-Tune runs I did last August right after I installed my TS-100 cams. I was running a FM 2-1-2 at the time and didn't see any back and forth (purple to red to white and so forth) VE changes below 2750 row. It seemed to get better and better. But what I did see, and this had been the case over dozens of V-tune runs with different mufflers and stock cam, was the purple-white-red-white-purple action in the 2750-3250 rpm area. Could this be attributed to O2 sensor positioning? As for my most recent 4 V-Tune runs with TTS-100 and decat OEM, it went white and stayed white, except for areas that I hit for the first time; and a spot around 1125-1250 at 70-80kPa. That area had some back and forth in 1 or 2 cells, but all the area around it looked nice and white. I still need to collect more at 5000 and up, but I don't ride up there as much and will eventually get to that after I finish dialing in the WOT VE and timing.
Again, thanks!
Outstanding HDF Member
Joined: May 2007
Posts: 2,304
Likes: 31
From: Florida
Thanks for the insight. I went back to 7 V-Tune runs I did last August right after I installed my TS-100 cams. I was running a FM 2-1-2 at the time and didn't see any back and forth (purple to red to white and so forth) VE changes below 2750 row. It seemed to get better and better. But what I did see, and this had been the case over dozens of V-tune runs with different mufflers and stock cam, was the purple-white-red-white-purple action in the 2750-3250 rpm area. Could this be attributed to O2 sensor positioning? As for my most recent 4 V-Tune runs with TTS-100 and decat OEM, it went white and stayed white, except for areas that I hit for the first time; and a spot around 1125-1250 at 70-80kPa. That area had some back and forth in 1 or 2 cells, but all the area around it looked nice and white. I still need to collect more at 5000 and up, but I don't ride up there as much and will eventually get to that after I finish dialing in the WOT VE and timing.
Again, thanks!
Again, thanks!
Doc
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Road Master
Joined: Sep 2009
Posts: 1,180
Likes: 33
I'd like to see your v-tune data, VE tables, of the 4 you did wit the decated header and the TTS 100. Can you send them to me at hdmd88@yahoo.com
Doc
Doc
Will do and thanks for taking a look. Files are sent.
Last edited by TheBobs; May 5, 2016 at 07:36 PM.
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