2018 CTS-V unknown fuel cut when spinning?

I am currently working on a V3. Nothing too crazy, ported blower/cam and meth. Made 710whp/800lbft. Only issue I am having is for some reason if it spins in 1st it will not shift to 2nd. I have attached the current tune and a couple logs of it doing it.

I can see that it is cutting fuel somewhere between 5500-6500 (its inconsistent) even though the rev limiter has been bumped to 7k (for testing.)

Thanks for your time. Attachment 99782Attachment 99783Attachment 99784

you got to dial in your torque tables

no way at full throttle just before 5K your timing is zero and negative which essentially is causing a miss

Thanks for the reply!

Perhaps you could be more specific on what the problem with them would be? I have a good understanding of how the virtual torque tables work and I do not believe they are the issue in this case. Do you mean a different torque table perhaps?

The car is triggering fuel cut and rev limit tq management before the rev limit has been reached, which I believe is the main issue.

there is torque mnagement type pid somewhere and it will say whats pulling timing, also ur almost doubling your rail pressure versus whats demanded, went and looked at a couple zl1 and zo6 and all stay with desired and vever over roughly 3k psii, ur hitting close to 5k psi with commanded of 2900

Yes, it says Trans S, fuelcut and Trans T once in a while, those channels are all in the log above. Problem is, they dont say fuelcut when its happening and give random revlimit when the engine is deceling? I noticed the fuel pressure spiking as well, I figure that is because of the unknown fuel cut. When the pressure spikes, the injectors show 0 or low ms, IE fuelcut. Makes sense if there is no where for the fuel to go. Still trying to sort out WHY it is cutting fuel though.

Turn off predicted torque under fuel>cutof dfco can raise the commanded down at the bottom across the board to 2500 and raise the fast torque enable to 6000. That will make the rev limit work more like older ones and not hit unitl what you have set in it. No early fuel cuts or predicted throttle cut. then need to lower the shift points if that doesnt take care of it and I dont see the tcm on the tune so assume its still locked which will have the first gear max torque down at 550 stock I think which your all over that now at this point. Ive seen people work around it but easier to unlock the tcm and raise the limits.

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Originally Posted by lt1z350

Turn off predicted torque under fuel>cutof dfco can raise the commanded down at the bottom across the board to 2500 and raise the fast torque enable to 6000. That will make the rev limit work more like older ones and not hit unitl what you have set in it. No early fuel cuts or predicted throttle cut. then need to lower the shift points if that doesnt take care of it and I dont see the tcm on the tune so assume its still locked which will have the first gear max torque down at 550 stock I think which your all over that now at this point. Ive seen people work around it but easier to unlock the tcm and raise the limits.

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Just to clarify, you're setting the entirety of ecm 12073 to 2500 across the board?

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Originally Posted by sevinn

Just to clarify, you're setting the entirety of ecm 12073 to 2500 across the board?

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yes well I actually have it maxed on my tune. If you do this on a manual it will then rev out and let you attempt to launch it hard. It removes the 4k limit totlaly from it.On the auto I have found it makes it have more of an old style rev limit with out fuel cuts and throttle cuts. So if you have 7k in the rpm it will not hit it unitl it reaches 7k and its more of a timing cut limit like early stuff.
I looked over this tune a little more there is no vve in it and I mean no values. You need to put that back to stock at a minumum who knows how much that table having all zero in it is skewing the vt and shifting on this thing.