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Dyno-Jet PV Help

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Old Sep 6, 2021 | 08:59 PM
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Default Dyno-Jet PV Help

Let me start with I'm n (old) idiot when it comes to technology.
I installed a Dyno-Jet PV unit on my 2014 103. Fuel Moto was kind to send me a tune for the mild changes for the slip-ons and K&N filter that I installed. Somehow it did get the email opened and dragged into the WinPro program on my computer. I was able to load it to the DJ unit and load it into the ECM of my bike.
After a couple of days I decided that I would try to auto tune the new program that I was running. I rode the bike in the Auto tune mode for about 50 miles. Then uploaded it into a new bin and loaded that tune as a FLASH into the ECM.
What I don't understand is what the screen display is telling me. Attached is a photo of the Auto-Tuned new Fuel Moto tune that I loaded.
Does it look correct? I was told that all the fields would be RED in color for a perfect tune. I'm not looking for Perfect just hope that the Auto-Tune made some positive corrections.

Thanks

 
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Old Sep 6, 2021 | 10:17 PM
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That's the log screen for "hits" during the auto tune session.

The cells turn red when they have enough hits (gathered enough data) for the auto tune process. The cells that are not red, didn't get enough data to make any adjustments in those cells...

You have a really good number of cells that are in red, for a basic auto tune session.... You should be happy with a hits screen populated with that many red cells

If you exit that "hits" screen, you go back to the Auto tune Screen. There is a line at the bottom header on that screen, that shows:

"Learned VE:___ cells, avg __%, max __%"
The blanks will be filled, from left to right, with the number of VE table cells that learned during the auto tune session, the average percentage of change made to all the cells during the auto tune session, and the max change made to any one cell during the auto tune session.

The goal is to get that average cell change percentage to around 4%. If you try to get better than 4%, you'll just be chasing your tail.

In the pic below, taken from a DynoJet website video, the auto tune session showed, learned 132 VE cells, the average change was 8%, and the max change was 15%. If that was my auto tune session, I would save that map, but I would run another auto tune session on that map trying to get the average change closer to 4%..




FWIW... on maps I've gotten from FuelMoto, I have auto tuned them in both AT basic & AT pro. I have the Auto Tune Pro module with Wideband O2 sensors. In almost every case, the first AT basic session reached a 4% average change. I did an AT Pro session on an early EFI bike with an all open loop tune, and it showed a 1% change after a 30 minute session. That speaks well of the tunes that FuelMoto sends out, to be that close...



NOTE:
You won't be able to populate all the cells during a street tune, at least without breaking every speed law in the area... Only during a dyno run, will you have the best chance to populate all the cells...

You don't want to populate all the cells during an auto tune basic anyways. The AT Basic uses the OEM narrowband O2 sensors. They aren't accurate outside like 14.3 to 15.1 AFR readings. So populating the high rpm, high load cells while in AT Basic, won't give you good data in the cells needing AFRs outside of that range. That's why dyno runs use wideband O2 sensors for tuning. It covers an AFR range of like 10.0 to 18.0 AFR. It will give good, accurate data for any cell you would populate.

I went to a class at DynoJet several years ago. The instructor said that while in AT Basic, it's best to just drive normally, trying to replicate the RPMs, loads, and speeds you would normally drive (ie: freeway, hills, two-up riding, slower winding roads, etc). That will improve the areas of the tune you use most.. and mostly stay within the accuracy of the narrowband sensors.
 

Last edited by hattitude; Sep 6, 2021 at 10:21 PM.
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Old Sep 7, 2021 | 08:56 AM
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Your posts are always so informative and helpful @hattitude . I learned a lot from your reply. Now, I want to go see if I am at $% average lol
 
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Old Sep 7, 2021 | 09:24 AM
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Originally Posted by maxxym
Your posts are always so informative and helpful @hattitude . I learned a lot from your reply. Now, I want to go see if I am at $% average lol

Thanks for the kind words...

I'm certainly no expert, and learn a lot from others on this, and the HTT forum.

Since my retirement, I've become a voracious reader about Harley issues. When I don't understand something, I make an effort to do some research to try and get an answer..

I'm just sharing things I've read, experienced, or have been taught...
 
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