Inconsistent Timing cut on 1-2 shift - Gen 3 Coyote/10R80

[barkingspud]

I thought I had this issue taken care of but apparently not. First log (3rd run 9.38.hpl) was as close to a perfect pass as you can get for the car. No issues and backed that pass up with a carbon copy. My 5th run, not so much as you'll see in the log (5th run 9.64.hpl) there is a timing cut "event" that lasts for right about .8/sec killing the run. I changed NOTHING. Any ideas/clues?

3rd run 9.38.hpl
5th run 9.64.hpl

[small tuner]

maybe hitting engine or transmission limiter

[barkingspud]

maybe hitting engine or transmission limiter

What doesn't make sense is the fact that nothing changed from one run to the next. I've got all the source PIDs logged. :frustrated:

[veeefour]

I thought I had this issue taken care of but apparently not. First log (3rd run 9.38.hpl) was as close to a perfect pass as you can get for the car. No issues and backed that pass up with a carbon copy. My 5th run, not so much as you'll see in the log (5th run 9.64.hpl) there is a timing cut "event" that lasts for right about .8/sec killing the run. I changed NOTHING. Any ideas/clues?

You are hitting cyl press limit - address that.

Also you need to work on your SD/torque models. MAP reports 1,65 and load reports 1,75 - should be the other way around.

Bank to bank trims are bit apart, log Rail pressure probably low and one side gets less.

[barkingspud]

You are hitting cyl press limit - address that. - I am actually using the Cylinder Pressure Limit table for WOT timing. So, working as intended

Also you need to work on your SD/torque models. MAP reports 1,65 and load reports 1,75 - should be the other way around. - Understand. I actually have an updated tune with a completely new SD/torque model but it hasn't fixed the timing cut issue.

Bank to bank trims are bit apart, log Rail pressure probably low and one side gets less. - I see that and addressing it.

[veeefour]

Using cyl pressure as a CAP is not a good idea as this is a limiter designed to cut hard. Recovery from it is hard and slow.
Use a proper BRD/MBT method to achieve the best result.

[paulsmithsr]

2nd gear clutch slipping