Power Vision Information Thread
Road Master
Joined: Dec 2012
Posts: 848
Likes: 30
From: CO
Knock sensor have been known to pick up ghost readings.
Example loose exhaust bolt causing a vibration under certain RPM simulates a Knock condition.
So do some research on False Knock
That may be your issue
Remember if you disable the sensors and you are having detonation, you will jack your engine up sooner rather then later
These are the issues I have found in cars I have modded. I have not gotten to tuning the Ultra yet, my tuner is in the mail. Mods will start this winter
Example loose exhaust bolt causing a vibration under certain RPM simulates a Knock condition.
So do some research on False Knock
That may be your issue
Remember if you disable the sensors and you are having detonation, you will jack your engine up sooner rather then later
These are the issues I have found in cars I have modded. I have not gotten to tuning the Ultra yet, my tuner is in the mail. Mods will start this winter
Tourer
Joined: Dec 2005
Posts: 417
Likes: 3
From: CT
I use the log file from the flash after the auto tune, but when I reduced timing to stop the knock events, they got worse. I did another 2 auto tunes today and rode it pretty hard with several high load throttle tunes and got a rather large 7% change in the VE tables. Guess it isnt ready for AFR and knock adjustments just yet. Unfortunately the rain has arrived...
I'm sure they can answer it.
pvtech@dynojet.com
Road Master
Joined: Jul 2009
Posts: 830
Likes: 44
From: Illinois
Thanks
Im just starting to mod my Bike. only had it a few months.
Good info Looks like Ill be on a new learning curve for a while
Road Master
Joined: Dec 2012
Posts: 848
Likes: 30
From: CO
Oh and here's a post about the ion detection system.
https://www.hdforums.com/forum/engin...explained.html
Road Master
Joined: Dec 2012
Posts: 848
Likes: 30
From: CO
I've been running all open loop. I replaced both my O2 sensors, saw almost no change, but at least I ruled them out. My VEs are based on stock but tweaked manually using the AT results as a guide, spark plug readings, and performance, manually enriching important areas like WOT and areas where I get consistent knocking. I've spent a lot of time with my spark tables trying to get rid of all knocking, but it seems no matter what I do there is no way to get rid of all of them. I'm at the point I think I'm gonna just leave it where it is and let knock detection retard if and when it needs to. I don't want to retard my tables any more than I already have.
I still think that my knocking is mostly due to the very high levels of carbon buildup on the tops of my pistons that I posted borescope pics of a while back. Still haven't figured out why I have such bad deposits on a low mileage engine, but I plan on rerouting my crankcase vapors to outside the intake very soon.
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