what are your VEs doing during all these runs? Are the VEs front and rear changing at less than 5%? If so then you need to move onto timing and EGR

 

I have 3 and 4 cells (front and rear respective) that are at 5.5 to 7% difference. These are at 5, 7.3 and 10% throttle, 2000 to 3000 rpm. I am going to address those with a concentrated run in those areas before proceeding with the other. The retard is not occurring in this area so while the 7% is an issue, I do not think it is related. But I am open for opinion. All the other cells are within 3% between runs, a lot are 0 and 1.5 is pretty common

Most of my runs have been with slow throttle roll, up to 4500 to 5k rpm. I need to do some in town, slow stuff to get the lower end.

 

Im no expert. But to me, These VEs look pretty nasty. That msg came up on the rear cylinder and the closest to the max is 126.5 at 3000 rpm and only 20% TP. There some cells around it that are getting close, but it just doesn't seem right to me. There are some high numbers at 4000 WOT, that makes more sense to me. Its only the 6th data run, should I just keep doing more before looking into incorrect 02 readings?

 

Sorry first and last photo are both rear cylinder, I doubled up

 

I'm a newbie to SEPRT. Can someone direct me how to do data logs and then review the logs ? Also if I want to lean my tune for better mileage after my dyno tune, can I adjust fuel injectors size to cheat a little on program options vs redoing complete VE tables ? I'm am running open loop .

 

So if im understanding this correctly, and i increase cubes by 10% and decrease VE by 10% to effectively balance it out. Then smart tune again, wont that just bring the VEs back up, possibly close to where they already are. Am i on the right track or am I miles off?

 

No no no. Once the bike has been (properly) tuned, then the VE tables will be set correctly to your bike set up. To adjust the Air-Fuel-Ratio, you adjust the entries in the AFR table. (Hence the name!) You shouldn't play with the values in the VE, CI or injector tables.

Why are you running open loop? If your target AFR can be achieved via closed loop, you will be better off using closed loop as it allows the system to adjust to differences in fuel, altitude and temperature which otherwise could mean that your tune drifts way off target.

 

That's correct. The idea is to keep the behaviour of the system the same whilst giving some more headroom in the VE table.

Maybe, maybe not. The idea is to give some room for the VE entries to continue to rise if necessary. They will only move if the values (prior to scaling) were incorrect.

 

those VEs look normal to me during initial tune runs. I've had them dial right in within 3 or 4 runs before, but some as many 15 or more runs before VEs were changing less than 5%. Once you get to that point then you move onto other tables. If you keep bouncing back and forth changing things during your runs on different tables, you'll never finish.

 

I was wondering what was meant by nasty. Not being an expert on this am I looking for a more smooth graph? Are these looking ok? I am just not wanting to not understand something here or miss something.