2 quick questions.

[PurplePiss]

Today I saw 2-3 degrees of KR for about 2 seconds as I can through the finish line. Did that cause damage? I honestly could not hear it at all which is amazing to me.

Second question. When I look at the logs I see when I go 100% throttle that the O2's go to zero until I let off. I have one run logged where after the 1-2 shift the O2 turned back on for a second then shut off again. What's up with dat?

[EC_Tune]

Hmm. Could the o2's be >1000 mv?

EC

[PurplePiss]

Not sure what you mean. They are stock. I'll be posting logs of my runs in the other thread and you can see the O2's turn on after the 1-2 gear change. Strange.

[PurplePiss]

Just was looking over the log. Its run #4. It looks like it hit the rev limiter. Would that kick the O2 back on?

[WorkingManPerf.]

Rev limter is a ECM Fuel Cut , No fuel = No AFR to read

[EC_Tune]

Are you referring to the drop in o2 mvdc to 48mvdc during the shift, say at frame 3025? you may have just touched the rev limiter there.

[PurplePiss]

Exactly.

What I did to fix it was set the WOT mph 1-2 to 35 instead of 40 and set the WOT rpm 1-2 to 6370 instead of 6400. The 2-3 shift seems ok. What is the best setting for the rev limiter? Fuel Cut, spark cut, etc cut or all?

[EC_Tune]

You probably want all of the above.

The LS2 has a much softer landing when you hit the rev limiter than LS1's & it doesn't *bang* the engine nearly as hard. Just sounds like you have a plug wire off.

EC

[PurplePiss]

This would be set under Engine/Fuel Cutoff, DFCO/Control method correct? So set all of them to Enable? Why does the factory only have fuel cut enabled?

[EC_Tune]

Fuel cut works superbly. It turns off fuel one cylinder at a time up to all 8 very rapidly, engine slows down gracefully and nothing gets hurt. A cylinder with no fuel will actually cool things down a bit.

Factory settings actually are fine. You could enable ETC cutoff to protect the engine from overrev as well. It will start closing the throttle rapidly to keep RPM under control.

EC