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Discussion Starter #1
I'm planning on fitting a Power Commander V to my 97 TL S. I want to install an auto tune kit but I'm not sure if I need a single or dual channel kit. I would assume the dual-channel setup would be better but the only way to get a really clean sampling of exhaust gases off the rear cylinder will be off of the stub pipe. As it is a TLS I would have to drop the engine to weld in an exhaust O2 sensor bung. I guess my question is, is the Dual Channel setup better than the single enough to justify removing the engine to install it?
 

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I will atemps to do this on M4 headers.

I have not given up yet on putting the bung in the back past the swingarm.

You use the stock headers ?

Oh, and I read the bung as to be beetwin 6inch and 18inch.
 

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Discussion Starter #3
I will be putting a full yoshimura system on it in a few weeks.
 

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I have 90 degree and 45 degree bungs on order.

Will look under the bike this week end to hopefully get some ideas.
 

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2 sensors, locate the bungs where you can get to them when the exhaust system is fitted on the bike.
Aprrox. 12 to 18 inches back from the engine flange and before any merging or crossover pipes.
Try and mount the bungs horizontal or slightly higher, this will help keep any moisture out of the sensor.
This mainly applies to the front pipe, as rear pipe access is limited to, in most cases on the vertical (or near)
before the pipe passes through the swingarm.
 

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Dynojet said 6-18inchs.

If able to fit to rear,,,, that should be duplicated to the front.
Meaning if it's 14inch from flange at back, then it should be put at 14inch also in the front.
IMO.
 

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There's a nice youtube vid of someone puting a full system on a 790 Duke.
You have a nice view of the bung's and sensors put right before the crossover fairly close to the flange in that case.
I can't look up for the vid right now...


I imagine that any closer than 6inch you would run into heat problems and maybe also o2 readings.
 

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Dynojet said 6-18inchs.

If able to fit to rear,,,, that should be duplicated to the front.
Meaning if it's 14inch from flange at back, then it should be put at 14inch also in the front.
IMO.
They don't have to be exactly the same distance, reasonable will suffice.
The main thing is to have access to them. The rear one is always the harder one to do.
I would be amazed if you can place one within 8 inches of the rear head and still have access to it on our bikes.
In the real world it will be closer to 12. The most important thing is to have the up stream (a head) and away of any joins in the exhaust.
You just want the sensor to measure it's own head / pipe not a combination of, that and don't mount them in the under side of the pipe.
 

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Happy to post some pics tonight.
They will be from my Aprilia Mille R track bike.
Still a V twin. :burnout
 

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Factory Akra Aprilia WSSB replica system. Factory plugs.
Note the plugs are not the same distance from their exhaust flanges.

P1010095.JPG
 

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6"-18" is for all applications, not specific for our bike !
It is the range where the sensor as an adequate reading.

Compromises are often inevitable !

Car guys cheat and ad a spacer to change the sensors reading !
At least have the sensors at the same debt :)
Like if I put a 45 degree bung in the back I will use the same on the front.

Here's the video I was talking about:
https://www.youtube.com/watch?v=hD_bHyAqVqw
 
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