[cjperformance]

I have taken a few drives since I increased the shift RPM, and I can't seem to weed out the torque management that is happening.

Shifted "fine" when my shift mph was such that it shifted around 6750 RPM, but Now I have it just tickling 6900 rpm, first gear 38 mph, 2nd @ 62, 3rd @ 90 etc...

I noticed a couple of tables under Fuel -> Cutoff -> RPM limits such as Extreme Cutoff, In-Gear Cutoff, and Temperature based cutoff.

Extreme cutoff was previously set at 7,000 and I raised to 7,100 rpm.

The other tables, In-Gear and Temp-based cutoff were both set at 6,900 (right at my shift point) and I raised them to 7,000 thinking that was the problem.

I dont feel like it helped anything. It still is doing some weird torque mgmt stuff.

Use Predicted Torque is disabled under Control Method. VTT are adjusted by the method KingLT1 suggested by adding 10% to last row and interpolating downward.

In the logs I sometimes get "RPM Limit" under one or both of the Predicted Engine Torque Source and/or Immediate Engine Torque Source, and that does only seem to show up when this kind of thing happens. It also seems to happen more on the 3-4 shift and 4-5 shift... but not always... and it seems to be less of a thing in TUTD mode... which is what has me scratching my head. The TUTD shift points are the same as normal D mode.

Any thoughts? Here's a screenshot of a particularly bad case. Ignore the LT Fuel Trims it's a very different temperature/humidity day since the last time out so I think it's throwing that off.

Sometimes it will shift fine, other times it's a ****-show like the below screenshot. That dip represents a full second and a half before it returns my throttle and timing back to what it should be.

[SATINSTEEL1LE]

TCM unlocked and tuned? Because its 100% necessary to get rid of all TQ management. There are things in the TCM that need to get changed.

[cjperformance]

Originally Posted by SATINSTEEL1LE

TCM unlocked and tuned? Because its 100% necessary to get rid of all TQ management. There are things in the TCM that need to get changed.

Yep, all unlocked and tuned.

I'm leaning towards it being the rpm limits still. I believe it tries to "predict" an rpm overrun rather than let it actually happen.

Maybe I'll drop all my shift points by 1 mph and see if anything goes better.

[radz28]

I'd look at TCM, too.

I fooled around on one of our cars for a while regarding this. There are some work arounds, but that TCM, ultimately, will retard performance in some scenarios.

[cjperformance]

Some other cases in the log where it happens I do see 6,900 rpm hit right before the tq mgmt... Maybe I missed a limit setting somewhere?

These were the three I changed:
-Extreme Cutoff: was 7,000 -> 7,100
-In-Gear: Changed all fwd gears from 6,900 to 7,000
-EOT: Changed everything 41 deg and up from 6,900 to 7,000

I feel like I shouldn't go any further with that for now. If anyone has other thoughts let me know, otherwise, I'll just try dropping shift mph by 1 mph to keep it under the limit... again weird thing was... it didn't always hit 6,900 rpm for it to start happening, so that's where my confusion is.

[toohighpsi]

In the left column, scroll all the way down, what's in commanded torque? Make sure its enough. Anytime 7k is exceeded the ecu is in limiter mode no matter what the rpm values are.

I also think you need more than 100 rpm cushion if you want to run to 7k. put 7200 in EOL, set the others at 7300.

[KingLT1]

The rev limit tables should be 300 rpm higher then actual shift point or you will run into issues ime. Either way you Shouldn't need to spin a stock engine that hard. Put a smaller pulley on and lower your shift points.

[cjperformance]

Originally Posted by toohighpsi

In the left column, scroll all the way down, what's in commanded torque? Make sure its enough. Anytime 7k is exceeded the ecu is in limiter mode no matter what the rpm values are.

I also think you need more than 100 rpm cushion if you want to run to 7k. put 7200 in EOL, set the others at 7300.

Thanks for the head's up there. It sounds like there is a hard limit over 7k then going into rev limit mode? I see now how that table would affect things.

Originally Posted by KingLT1

The rev limit tables should be 300 rpm higher then actual shift point or you will run into issues ime. Either way you Shouldn't need to spin a stock engine that hard. Put a smaller pulley on and lower your shift points.

Got it. I agree. My intent is not to spin over 7k. I want to keep my engine in one piece. My target shift point (peak RPM) was around 6850, and sometimes I'd get this rev limit thing kicking in before it even reaches 6750, which was confusing me thinking something was off with torque model or something. Also the fact it acts different with TUTD and D mode is just weird.

I'll rework the shift points back down a bit, and report back when I get some time.

[JP374]

Originally Posted by toohighpsi

In the left column, scroll all the way down, what's in commanded torque? Make sure its enough. Anytime 7k is exceeded the ecu is in limiter mode no matter what the rpm values are.

I also think you need more than 100 rpm cushion if you want to run to 7k. put 7200 in EOL, set the others at 7300.

I am curious, should the commanded tq value be set to what the engine makes or higher?

Thanks Jp

[toohighpsi]

Originally Posted by JP374

I am curious, should the commanded tq value be set to what the engine makes or higher?

Thanks Jp

Enough to keep the throttle from closing if you're running in this region, stock values may be enough but depends on the build.

[KingLT1]

Originally Posted by JP374

I am curious, should the commanded tq value be set to what the engine makes or higher?

Thanks Jp

Higher...I have never had a issue setting peak torque limit above actual. If it's set lower then the throttle won't open all the way.