4-5 auto tune sessions completed with about 120 cells each time. Always interesting to see the 1750 rpm, 20% TPS VE cell is always way higher than those around it. (118 vs 95-105).

I changed the min hits to 20 (from 5) so the little blips through some of the cells don't get registered.

Something else I'm doing differently is not having my heated gear or stereo playing at the same time as when I'm auto tuning. I believe those heavy electrical loads affect the spark. When I was auto tuning earlier this year, I was wearing heated gear and of course blasting my 700W stereo 😎.

 

Almost makes you wonder if you are getting good data there.

 

Exactly. I don't ever ride there as I like to keep RPM >2000. Of course I pass through that cell in 1st gear when accelerating. I did do one autotune session from 1500 to 2500, 99 hits on each cell, 8% to 80% throttle. I'll have to redo around that cell. and verify.

 

remember the data rate is going to cause you some issues, so you will need to hold the engine steady around your trouble area to allow the data you get to be what's really going on. Flashing through the area isn't going to work well as you are seeing. Try using higher gears than normal in the lower RPM areas to slow the engine down and allow the real data to get there.

 

Always appreciate the insight Steve!

I’m pretty sure I use 6th gear for low rpm cells and the engine is not happy, lugging. Is that okay while tuning? I do my best to get at least 20 hits at a time in a given cell. The low and high rpm ranges are easy to get 99 hits all at once. For the low rpm I use the brakes to keep me in a cell 🤫 The cells in the peak torque range are the hardest to get good long durations of hits.

 

Yes you can lug the engine when gathering data, but not to the point that the compensatory is banging around loudly. Remember that the engine responds to the various camshaft designs differently, along with the exhaust. The compensatory is really a two way spring assembly and when it winds up and releases the data isn't any good. Since I have no idea what 20 hits truly means in your PV I would venture to guess you should be more like the 50 hit min. range to help average out the bad hits that are in there. Low RPM's are easy to do if you have a long lonely hill you can use and not get run over. Let's say your averaging 10 hits per second coming in, that means you would need 5 seconds of steady data and a cell is really a big area so you want to get hits spread around within each cell. If you look at the splits in the TPS, some cells cover a smaller range and others are near triple the range in one cell, same goes for higher RPM areas. The cells that cover a larger range need more data so 50 may not be near enough in them.

 

I see what you’re saying. And thanks for clarifying the lugging.

on every cell I can hit, I make sure I get 99 hits. When I mentioned the 20 hits earlier, I mean it as I need to stay within the cell for 20 hits before letting it go into another cell, so as to not blip through a cell.

I do have my “min hits to save” set to 20 as well, so PV doesn’t update VE based on a blip through a cell. I will increase it to 50 so I get a better average on cells I’m not focused on.

One thing I’ve not done is try to move around within a cell… that’s a great point. I’m more focused on staying within a cell with a steady throttle.

I have the Texas backroads all to myself. I have my pick of small hills, curvy roads, and straight flat roads.

 

If you look over the VE tables the lower splits are like 3, 4 ,5 ,7.5 so the cells are fairly narrow but when you get to the heavier areas they are like 40, 60, 80 so there is much more you need in those, same goes for the RPM side of it as well.

 

 

That's a shitty picture. I hope you walked away in one piece.