I looked at the datalog from last night, and the truck was nowhere near the rev limit when it shifted 3/4. That shift took place around 7600rpm. The throttle is closing still but there's no torque source code to indicate a rev limit issue. What I did see however is that the gear commanded is oscillating back and forth between 3 and 4 right before the shift, however it doesn't do it on any of the other shifts.

 

What is the actual TQ source value? Does it change at all?

The transmission tuning for the 2014 and older 6r80's is different then the 2015-17, mainly in the way they look at gear changes. It is more complicated on the older transmissions, especially at high RPM. There is clearly an issue here, but I've not even been able to find a similar case using the googles. Its clear the truck was trying to shift much lower in the RPM band, you can see the notchiness in the RPM graph corresponding to the oscillation in the gear commanded. The throttle closing is odd, but might be related to torque management or some other issue that wasn't captured by the data log.
I poured over my data logs from Matt and I had a similar issue on some 2-3 shifts, where the throttle plate closed, and I observed a torque source of 20 and 22 on different logs. I did not get the gear commanded oscillation however.

If he cannot fix the issue, then try lowering the shift point a couple hundred RPM and see if it goes away.

 

I lowered the shift mph for 3/4 by 2mph, but it didn't seem to make any difference. I was going to do one more pass with it lowered 3mph but someone oiled down the whole track so I went home. The torque source didn't show anything, iirc. Perhaps you can pm me your email address and I'll send you the log?

 

maybe i can attach the file here

 

Without the updated pulse ring you will not be able to shift above 7600 regardless of where the rev limit is set on the 11-14's

 

Hey Russell, I'm gonna post my analysis of your log here as there are many more skilled members present in this section who will hopefully correct me if I'm wrong.

Whatever caused your throttle plate to close probably saved your motor, as you are running out of fuel in a big way. SCT cannot log them, but I'm thinking if we could see spark source or fuel source codes, we would have the answer for why the throttle plate closed.

Matt is commanding .79 lambse through the pull, but by 7200rpm your measured afr is .82 lambse, and by 7500rpm (2-3 shift) your measured afr is .86 lambse. Just before the throttle plate closure at the 3-4 shift, at 7700rpm, your measured afr is .88, which is roughly 13 to 1, which is too lean for a boosted motor. Your short term fuel trims were also climbing, at 1.12...which is telling me the ECU is commanding more fuel but it just isn't there.
You were also seeing 18 degrees of timing right before the throttle plate closure with a MAF flow rate of 75 lb/min, which means you were making some good power, probably around 700+ in that good air.

There was no knock showing on the log, but timing was all over the place varying between 15 to 18 degrees. I'm suspecting Matt turned the knock sensor sensitivity down, as the values it is showing are a little too stable. I'm not sure what you were running for fuel, but I hope you had a little boostane on board like you usually do.


If you want to keep running this hard, you will need to add some injectors and a BAP or bigger fuel pump. If you don't want to add those, then you'll need to cap it at 7200rpm as that is where you really start to run out of fuel. This is your data log below. Below that is one of mine with Matt’s tune.



Here is one of my data logs when I was running Matt's tune, this is after the DW400 pump and DW95lb injectors, with a 72mm pulley. My AFR is .79-.81 through the entire pull, and STFT remains very stable around 1.00 the entire rune, so my fueling is healthy. I posted this to show the difference between our logs, and to highlight how you just need more fuel.

 

thanks Chad, Matt also informed me of the lean condition. He said it's a result of the good air versus the lower gears. I've heard of the pulse ring thing and I'm surprised that Matt would let it shift that close to the barrier so to speak that Blue 5.0 referenced.

 

I've heard that if tuning with HP tuners, there is a sort of patch for this and some tuners have accomplished clean, consistent shifts above 7600, with SCT that'll be a challenge without the upgraded Pulse ring. The sweet spot for me seems to be about 7550 or so. Above that sometimes it will hit the limiter, and/or throttle will close.

 

Well as far as i could tell the torque source wasn't throwing any codes or whatever you call them like it did before. There may be several other factors like Chad said. Matt assures me that he's got this and we'll get it straightened out.

Anyway since I've got to upgrade the fuel system, I'm going to throw on the 72mm pulley also.

 

What's your expectations or hope for new PB after the fuel system upgrade and getting the shifting ironed out? There was obviously a little left on the table because of the 3/4 shift as is. You think 11.2-11.3 is attainable? Or better....?