[2020ZL11LE]

Hoping somebody can help me here? Looking for the stock shift tables for my 2020 ZL1 1LE.

I had my car built and the transmission tuned, now track mode does not shift like it did in the past, revs are low and the shift points aren't what they were.

Wondering if anybody has the shift tables they can share with me?

Looking for Normal, Pattern A and most importantly, Pattern B which is track mode.

Both up shifts and down shift speeds.

Thanks in advance for your help!

[SATINSTEEL1LE]

Pay a tuner maybe? Or post the question on the HPT message boards.

[JSH]

Originally Posted by 2020ZL11LE

Hoping somebody can help me here? Looking for the stock shift tables for my 2020 ZL1 1LE.

I had my car built and the transmission tuned, now track mode does not shift like it did in the past, revs are low and the shift points aren't what they were.

Wondering if anybody has the shift tables they can share with me?

Looking for Normal, Pattern A and most importantly, Pattern B which is track mode.

Both up shifts and down shift speeds.

Thanks in advance for your help!

They're in your stock tune which is at GM, your dealer, and your tunes folder in HPT. If not, ask your local dealer to download it for you.

[2020ZL11LE]

I did pay a tuner, unfortunately it still needs some work.

Thanks for the other suggestions, I hope the dealer will share this information with me and I have posted a thread on HPT...

[SFV1LE]

Originally Posted by 2020ZL11LE

I did pay a tuner, unfortunately it still needs some work.

Thanks for the other suggestions, I hope the dealer will share this information with me and I have posted a thread on HPT...

Who is the tuner that did this to your ZLE? You have a Katech Stage 5 so I assume it's them.

As a tuning expert qualified to make changes to your ZLE ECU and TCU, don't they have access to the stock settings or ability to find these themselves? If not, I recommend you don't let them fix it, find a new tuner. If Katech can't make this right, I'm surprised and disappointed.

[2020ZL11LE]

Originally Posted by SFV1LE

Who is the tuner that did this to your ZLE? You have a Katech Stage 5 so I assume it's them.

As a tuning expert qualified to make changes to your ZLE ECU and TCU, don't they have access to the stock settings or ability to find these themselves? If not, I recommend you don't let them fix it, find a new tuner. If Katech can't make this right, I'm surprised and disappointed.

That's correct, my understanding is that the stock TCM cannot be modified or read so the TCM had to be replaced with one that could be tuned. Because it couldn't be read its currently running shift points/strategy of the older T87A (not sure what year or model thus strategy is from).

[radz28]

Originally Posted by 2020ZL11LE

Hoping somebody can help me here? Looking for the stock shift tables for my 2020 ZL1 1LE.

I had my car built and the transmission tuned, now track mode does not shift like it did in the past, revs are low and the shift points aren't what they were.

Wondering if anybody has the shift tables they can share with me?

Looking for Normal, Pattern A and most importantly, Pattern B which is track mode.

Both up shifts and down shift speeds.

Thanks in advance for your help!

Do you HPtuners or an equivalent? It's only going to do you good that way.

Pattern B is SPORT and TRACK, if I remember logs correctly. And while it might come across otherwise, without sounding argumentative, getting the stock tune is likely not going to be helpful. And - you likely know the following already...

Your car is making power, likely, higher in the powerband. The stock shift points and firmness, etc., will not be optimizing acceleration. What likely needs to happen is the car needs to be driven to determine where those shift points are. That's either on a dyno, going gear by gear, or on the street, doing the same thing. Stock shift points might help with downshifts and part throttle, but you'll likely not be optimized for WOT. There are also TCC commands that have to jive and some other stuffs.

If you're like me, and impatient (no offense or anything), then if you don't have HPTuners, you might consider doing that, and get some remote tuning help from JRE or someone with equivalent experience. Otherwise - you could save money, and go back to who you already paid to recalibrate the TCM appropriately. There are a number of reasons why the car is driving the way it is, and if you've already paid them to calibrate the car, they should have no problem making adjustments here. Shift tuning not always an exact science, but I'm sure they can figure it out.

BUT - if you do have HPTuners, and don't want to wait, you'll likely have to buy credits to access the TCM, and will have to be connected to the interwebs while flashing. You could manipulate a lot of these settings yourself, buy increasing shift speed and RPMs. Shift speed, to my understanding, has more authority, but I would gradually do both, until you reach your desired amounts. Also - there are some overlap between the ECM and TCM, regarding shifting, so if you don't already understand or know about them, I'd do some research before getting too deep into the tooning.

JMO.

[JSH]

Originally Posted by 2020ZL11LE

That's correct, my understanding is that the stock TCM cannot be modified or read so the TCM had to be replaced with one that could be tuned. Because it couldn't be read its currently running shift points/strategy of the older T87A (not sure what year or model thus strategy is from).

So, if I have this right, you bought a HHP T87a TCM that had a stock tune registered to your car's serial number. Some tuner, and let's say KaTech for now, modified the stock TCM tune [just like mine has been] and you're unhappy with the results. If this is true, you either need a new tune from someone like Jannetty or you can reinstall the T93 TCM which should have your stock tune in it.

[radz28]

Maybe there is a new option out there now, for T93-cars, but the convention for a out the last year is this:

For T93-cars, as far as I know for about the last year, Houston House of Power has been selling T87A TCMs that have been modified to work with T93-cars (2019 ZLEs and up and 2020 ZL1s [maybe SSs, too - I don't know that for sure]) and newer). You had to connect to HPTuners, download a T87A A10 stock tune (and turn-off an ECM code), stay connected to HPTuners while flashing the new TCM, and off to the races. You could, then, modify the TCM tune to your discretion, though you always have to connect to HPTuners to flash the TCM.

From what it sounds like from others, the TCM tune for A10s have less buttons to push than A8s, but otherwise it's pretty straight forward. I will say the only "flaw" I see is that there are times the Trans Shift Mode PID displays a weird pattern at certain times, but otherwise, it's been great.

There's no problem with the "older" T87A tune. If they used the TCM a lot of the rest of us are using, if I recall, we all downloaded stock TCM tunes from the earlier T87A TCMs. It works just fine in my car, and everyone else's that I know of, including from other shops that use the same T87As. Maybe I'm misunderstanding...

[JSH]

Originally Posted by radz28

There's no problem with the "older" T87A tune. If they used the TCM a lot of the rest of us are using, if I recall, we all downloaded stock TCM tunes from the earlier T87A TCMs. It works just fine in my car, and everyone else's that I know of, including from other shops that use the same T87As. Maybe I'm misunderstanding...

My T87a was delivered to me with the stock TCM tune, which we edited.

[radz28]

Originally Posted by JSH

My T87a was delivered to me with the stock TCM tune, which we edited.

I got mine last Septermber-ish from HHP. Did you get yours around that time from them, too? I thought you had a shop do yours. Meh - not that important. Regardless - that's the way it was for me.

To the OP - while I'm not completely sure of your situation, and how you got the TCM tune you ended up with, and still want to do this yourself, I'm happy to email a copy of the stock TCM tune that I retrieved from HPTuners. I am dubious of it's compatibility, because your story is so much different than mine, but if it's helpful for you to have, I can send my stock toon.

[clg82]

Originally Posted by radz28

Maybe there is a new option out there now, for T93-cars, but the convention for a out the last year is this:

For T93-cars, as far as I know for about the last year, Houston House of Power has been selling T87A TCMs that have been modified to work with T93-cars (2019 ZLEs and up and 2020 ZL1s [maybe SSs, too - I don't know that for sure]) and newer). You had to connect to HPTuners, download a T87A A10 stock tune (and turn-off an ECM code), stay connected to HPTuners while flashing the new TCM, and off to the races. You could, then, modify the TCM tune to your discretion, though you always have to connect to HPTuners to flash the TCM.

From what it sounds like from others, the TCM tune for A10s have less buttons to push than A8s, but otherwise it's pretty straight forward. I will say the only "flaw" I see is that there are times the Trans Shift Mode PID displays a weird pattern at certain times, but otherwise, it's been great.

There's no problem with the "older" T87A tune. If they used the TCM a lot of the rest of us are using, if I recall, we all downloaded stock TCM tunes from the earlier T87A TCMs. It works just fine in my car, and everyone else's that I know of, including from other shops that use the same T87As. Maybe I'm misunderstanding...

Does the A10 have a specific tune you modify, or is it in conjunction with the ECM tune?

[JSH]

Originally Posted by clg82

Does the A10 have a specific tune you modify, or is it in conjunction with the ECM tune?

You have to edit both TCM and ECM tunes?

[radz28]

Originally Posted by clg82

Does the A10 have a specific tune you modify, or is it in conjunction with the ECM tune?

Those smarter and more experienced than I (and I've experienced it, lol) state that a considerable gain can be had, if done properly, by calibrating ECM and TCM. A lot of TM can be manipulated in the ECM, but, basically, the TCM has the final say. By that, I mean that there are at least 2-3 gears where the TCM will intervene and pull power (torque). But - there is a lot to be gained in the ECM, like torque tables and in minimum spark. You have to, also, disable a setting in the ECM in order for HHP's conversion to work.

Simply - you'll need to modify both, in conjunction with each other, the optimize your toon and get the most out of your combination.