[moperfserv]

The 'dangerous' comment refers to doing WOT runs on the street.
With my DynaPro dyno (same as the unit that Bazzaz is selling) I can add load and slow down the WOT runs to get more data.

<I use it went its available.
It could be dangerous.
Need to replace the sensor regularly.
Tuner will do a better job.>

I said 'sensor placement is critical' (not replacement) but you do need to monitor the function of your sensors.

When someone drops a bike off with an auto-tune system installed I need to confirm that their sensor is actually working right, if not I have to install my own, which I replace often.

Finally, a comment on the earliest posts in this thread;
AFR targets richer than 13.5 at light loads are really bad for sooting the plugs and plugging the sensor. Your engine doesn't make enough heat at light loads to burn the soot.

Doug

 

[moperfserv]

I can't think of any reason that a bike would run significantly, noticably better richer than 13:1 vs 13.6:1.
In the long run 13:1 will mess up your plugs and your wide-band sensor.
That is where I would start questioning the output or location of the sensors.
Before every dyno tuning session I 'free air' calibrate the sensors, which means I have to warm them up out of the exhaust and then power down and install them in the pipes.
I have sensor adapter manifolds that I can install in the pipe when I think that the location of the existing sensor bungs or inspection bungs (the 1/8 BSP bungs that are OE on Ducatis) are wrong for calibration purposes.
I have spent way too much time trying to find the source of high RPM ultra-leanness when the cause was a sensor location too close to the pipe cyl-to-cyl junction. And I mean more than 10" from the junction.
You don't know the magnitude of these variables until you have the ability to put the same sensor in the same pipe at a different location. It's an eye opener.
Having two sensors on a Ducati also opens ones eyes to the huge variation in idle AFR. Fixing that, using the idle air bypass screws, has a big positive effect on idle quality.
Don't assume that I'm ignoring idle vacuum synch. Even after synchronizing the idle vacuum, the AFR difference can be huge. Small changes in the air bypass screws will support large changes in AFR. (think about it; high vacuum gets rather large airflow changes, relative to the amount of air at idle, with small bypass adjustments)

Doug