GM's 6L80 HP Tuning, DoD, and Torque Converters! Part 3 of 3

This is the last part of a three part series covering basic HP Tuners. In this video, I go through the steps to downloading, installing, and using HP Tuners. This is a basic video showing what many techs to when modifying a 6L80 for stock use. It includes disabling the DoD, changing the torque converter clutch lockup strategy, and changing the slip speed and tcc apply pressure. In this video, I use a 2016 Silverado to perform the changes.
In case you missed the first two videos, in part one, I cover GM's Displacement on Demand (DoD, also known as active fuel management). You can find that video here: • GM's 6L80 HP Tuning, D...
Part two covers the torque converter in these 6L80s and how they are prone to failing. This is the link for part two: • GM's 6L80 HP Tuning, D...

[@crybaby982]

Great series with gobs of information on the problems and solutions with this transmission!

[@colbyscott9822]

Thank you so much! This series was easily the best I've seen on the TC issue. Just ordered the HPT adapter. Going to see how that works before committing to proactively replacing the TC.

[@guerosolis5794]

Don't forget to install the Sure Cool Thermostat delete part #STL010 .

[@dillonnations1891]

Wow amazing series, everything I have been saying for the past year that i have been running a transmission shop. Almost daily I’m telling people it’s a tuning problem but I’m really excited about playing around with this especially with our Frankenstein builds

[@Relisys190]

NICE INFO Looks like I'll be picking up HP Tuners soon for my 2017 Tahoe.

[@jasonluna8051]

Just wanted to add a comment to say thanks, this is REALLY helpful. I recently mechanically deleted the AFM in my 09' 1500 (and got a computer tune locally) and have been chasing my tail on a severe shake that I'm getting while coasting between 35 and 45 mph AND decelerating. I almost threw in a new TC but now I think I will buy an HP and try adjusting the tune first.

[@gilbertorodriguez8847]

I'm having a problem when coasting down from 50mph, and feel a braking when down shift

[@gcrauwels941]

Excellent series.

[@johnhowell4589]

Thanks for the video. It was very informative.

[@gcaprice406]

Very informative. Great video

[@opinionsevrywhere]

Can you explain how to perform the Adaptive relearn? I am enjoying your videos! Will you create a video series on what each of the transmission parameters do in the HP tuners software and how they work together for stock, mild to wild applications?

[@batsy74]

More information on what modifications folks may make to the pressures, schedules, and timing settings would be great.

[@jamesbtri]

Your a teacher???? Step away from the laptop

[@TurboTA89]

On the slip error table. Lower the value in the cell increases clamp psi? Great videos

[@hardcoreracer87]

Great video I'm local what do I have to do to get rebuild by 6l80

[@faridgadimov5955]

Great videos!i purchased mpvi2 after your videos and going to do step by step what you did.i have 2016 escalade with 8 speed transmission.what speed should I remove torque converter lock up?sorry for my English

[@siuautomotive]

Thanks! I have not tuned an 8 speed yet, but I would pull tcc till 5th gear. You might consider reading the hptuners forum and see what others have to say. Good luck! I think you should be good. I think 2017 and later 8l90s need there pcm sent into hptuners to get unlocked but I think your good with the 2016

[@lsxjunkie]

Anytime you do psi or TCC changes wouldn't you want to reset adaptives in the scanner?

[@kevincrochet3427]

Very informative video. Will HPTuners allow you to adjust shift torque or firmness? Meaning how hard it shifts from gear to gear?

[@siuautomotive]

Yes, you can change desired shift times and pressures

[@dprevette]

Great info for a Newbie like myself! Thank you! On the Apply/Release tab, do you put the same values in all the modes? ie: Norma/Pattern A, B, Tap up / down, etc?

[@siuautomotive]

I personally do.

[@dprevette]

@@siuautomotive thank you

[@edwardl9328]

Good videos Shawn. I used you 6L80 guide to rebuild my own. Great walkthrough. Since mybtranny blew up I have been looking into ways of getting more power while towing at 55-60. My truck is lifted so it keep going back and forth from 5th to 4th because it looses power on 5th and drops to 4. Then when it catches up, it goes to 5th again. I was thinking of dropping intake, exhaust and diable tune, but looking at the HP tuner maybe I can tune the trans. What would you recommend?

[@ridingwiththereids]

I'd recommend regearing to compensate for the large tires, along with HP Tuners.

[@bobbobby1846]

make sure you big tires are calibrated in the tune. tune might think it is something like 265/70R 18 and not a 35 or whatever size it is now.

[@chrisb2239]

Go Auto Dawgs!!

[@SafetyWesternRecreation]

Thank you for the video. I am locking out the TCC on my 2015 Sierra with a 5.3. I see you disable in the Normal Field, and Pattern A. Pattern B is already disabled. Do you need to disable under the Hot Trans filed too?

[@siuautomotive]

I wouldn’t. You hopefully won’t ever go into the “hot” schedule, but if you do, since the torque converter is the main source of heat in the trans, you’d rather it stay locked to help control the heat.

[@lukesizemore1170]

What are your thoughts on tcc lockup when towing, personally I feel it should lockup to eliminate unnecessary heat, however the factory settings for my 2014 Silverado 1500 has no lockup in any gear in pattern b (tow/haul) or in tap up/tap down mode.

[@guerosolis5794]

Don't forget to install the Sure Cool Thermostat delete part #STL010

[@mmejia7257]

I got the mpvi3

[@Gjones2171]

good morning i am unlocked 2018 silverado and have mpvi1 pro how do i increase my top speed in hp tuners

[@treybadd]

I think you are incorrect about the slip error table. It is a rate. I think a smaller number is going to apply it faster.

[@austinwittner7050]

Is what you addressed and changed in this video all that would need to be addressed in a stock transmission with an aftermarket stall converter? I just replaced my 6l80 in my g8 gt with a new one and replaced the stock converter with a circle d billet 3200 rpm stall converter. I am thinking of purchasing the hp tuner module and adjusting the trans myself. Would the actual shift points need to be adjusted with such a high rpm stall? Or would i only need to worry about tcc pressure and application?

[@austinwittner7050]

Also, i am very thankful for these videos. Very helpful information. I watched all 3 videos in this series👍🏻

[@siuautomotive]

With a high stall converter, I'm sure you'd need to adjust the shift points. Basically, under heavy throttle, your engine speed is going to be higher than your output speed due to the higher stall. You'll likely have to tune the shift points lowers to prevent your engine RPM from hitting the redline before the factory settings allow the trans to shift.

[@garedroessel4315]

I'm just looking to disable coverter lock up on decel to attempt to eliminate a rough 2-1

[@c_mac7773]

Did this work for your vehicle?

[@garedroessel4315]

@@c_mac7773 it did

[@guerosolis5794]

Don't forget to install the Sure Cool Thermostat delete part #STL010

[@edwinlora5520]

Anyone in the new york area that has tried this? New york, NJ or CT? Does this really work?

[@bryon7163]

Just FYI, you can save about $50 by purchasing the MPVI 2 + 2 credits off Amazon.

[@siuautomotive]

Good tip Bryon! HP is such a good tool even as just a scanner! Hope things are going well!

[@faridgadimov5955]

Thank you I saved 50$ after your comment

[@natebaer663]

Lol so disable tcc in 1-4 causes torque converter slip . Which will cause it to make heat when dealing with traffic. Ive had the tcc disable done from a shop that rebuilt mine.

[@abadish6748]

Hi, siu . I have a slip in shifting in the low speed, usually from 2 to 1, sometimes from 43 to 2. I heard this issue common in 2015 Tahoe 6L80e and It can be solved by tunning. If I applied this tuning to my 6L80e transmission this issue will be solved. I have no code, neither mechanical and software issues nor any other issue.

[@siuautomotive]

Tuning might cover the problem up for a while, but if you have slipping shift, there’s likely something else going on. These transmissions adapt to prevent slipping, so it shouldn’t happen. I’d be curious what your line pressure is….

[@abadish6748]

@@siuautomotive I will check and let you know soon.

[@abadish6748]

@@siuautomotive With my scan tool the calculated pressure line was 520 Kpa at 120km speed and 600 Kpa at idle, These values reading with proper shifting. The slipping wasn't happening.

[@siuautomotive]

Those are commanded pressures, but they aren't measured. An actual pressure test with a gauge will let you know if the trans can generate sufficient pressure. You could use a scan tool and command pressure changes and compare them to spec.

[@PrimeraRSTKD]

Quick question, why wouldnt you disable the TCC apply in 4th?

[@siuautomotive]

Many do just that. It’s personal preference.

[@PrimeraRSTKD]

@@siuautomotive Thank you. What exactly is the benefit from disabling the TCC lock up at lower speeds? MPG? Longevity? I have been searching and haven't found a clear answer.

[@PrimeraRSTKD]

@@siuautomotive Also I disabled the TCC apply like in your video and logged some driving and saw I had TCC Slip (rpm) 3-450rpm. Is this normal?

[@captaincookieandmilk6142]

I would never do this. I’d probably read it like 50x before I figured it out.

[@NORCALPYRO_]

Can you disable dod with hp tuners and still pass california emissions???

[@siuautomotive]

I would think so, but I cannot say for sure. Disabling DOD doesn't set any emissions codes. I did hear that some states check the CVN values on the PCM, which could indicate if the computer was tuned with an aftermarket tuner and that they could deny certification based on that, but I don't know if that's actually true. I guess google might have the answer if you want to go down that rabbit hole.

[@NORCALPYRO_]

@@siuautomotive i heard that aswell in california just looking for someone who can confirm it

[@jeromeburrasca6710]

Will this tune still pass California smog tests?

[@siuautomotive]

I know many shops will do the TCC modification in California, but I don't think any will admit to the DoD tune. I wouldn't doubt that the CARB will state that any modification to a OE vehicle is a violation, but I don't believe they have any way of knowing if transmission control has been modified. That's a good question and I'm just guessing at my answers.

[@jeromeburrasca6710]

siu automotive So, the ease of removal and installation of a Range Technology OB2 V4 mode disabler plug in is apparent for emissions inspections.

[@gilbertorodriguez8847]

Is this the same as reprogramming when replacing the Techm?

[@siuautomotive]

Not exactly the same. Some will use hptuners to pull the original tune off the unit then install on the replacement one. If it requires you to enter the vin, you’ll likely have to pay credits to install. Possibly on both vehicles. If you do this with a bench harness, you might be able to bypass the credit part. When installing a factory program, you are teaching the new techm the new vehicle and giving it the latest revision.

[@gilbertorodriguez8847]

@@siuautomotive The reason i asked is I rebuilt a 2015 Suburban. Then dropped it for inspection due to harsh downshift, ordered Techm and valve body,. Still harsh downshift Then again dropped for an inspection. Nothing wrong, air checked. But the harsh downshift still remained If I did it right, then there shouldn't be a problem, unless there's an update for the Engine control module, I can't explain to the customer with out proof this is needed

[@siuautomotive]

During the rebuild, did you address the common failure areas, like the pressure regulator valve, afl valve, compensator valve? Maybe check pressure during the problem to make sure you aren’t fighting high line pressure.

[@paulcondie2520]

Where are you located?

[@BeardMan01]

You look like Henry Rollins and Eminem mashed into one person.

[@garyrobinson3735]

That's garbage