HP Tuners and the 6L80 - Part Five - Torque Adder, Trans Time, and Output Torque Factor
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- Опубліковано 9 лют 2025
- This is the FIFTH video from a seven-part video series covering what the calibrations actually do in the 6L80/90 transmission. As you will see in the video, I have outfitted a 6L80 transmission with pressure sensors for each clutch and I recorded the pressure readings while shifting the transmission on our Superflow Dyno. I recorded baseline runs and also single modifications using HP Tuners.
In this video, I show how modifying the "Torque Adder, Transition Time, and Torque Factor" alter the transmission pressures.
In this video, I summarize the results for each of these calibrations. For a full report of each shift and each clutch, access the presentations and the raw files through my website at:
www.automotive...
You can get the free software to open these files at:
www.picotech.com
www.picoauto.com
www.hptuners.com
I will update this list of completed videos as I make them, but right now, these are the available videos in the series:
Part one: Intro and what you need to know • HP Tuners and the 6L80...
Part two: HP Tuners and the 6L80 - Baseline observations • HP Tuners and the 6L80...
Part three: Max Pressure, Max Press B, Max Clutch, and Max Line: • HP Tuners & 6L80: THI...
Part four: XYZ Pattern, Adaptive Oncoming, Adaptive Offgoing • Part 4 of the HP Tuner...
Part five: Torque Adder, Transition Time, and Output Torque Factor (you're here!)
Part six: HP Tuners and the 6L80 - Part Five - Torque Adder, Trans Time, and Output Torque Factor • HP Tuners and the 6L80...
This is the most under-rated series on UA-cam. Thank you sir!
Wish i had this dude as a coach. Starting hptuners myself but i try to do my best at everything i do, so being able to actually be taught by someone would really make me feel more comfortable in my business.
Great series! Really appreciate the care and time you put in to distinguish what is going on there. I’m setting up a 6L90 and this helps very much in figuring what to change.
Good luck with your work
Can't wait for part 6!
Initially I thought the inertial phase was when the incoming clutch was gaining inertia to catch up to the final output shaft speed. Now after looking at it, I almost feel like the inertia phase is when the car is moving under it's own intertia, or the brief moment between gears.
Maybe I'm wrong, I would love to hear how you think about the definitions of the terms. Fill is obvious, that's stroking the piston to prepare for engagement.
Love the series! Thanks for making these videos.
I thought output trq. Factor is for delivered torque data for ecm to use in traction control and stability management also torque management??
Danke. Tolles Material. Sehr interessant.
I don't have the equipment that you do to see exact results like you do, but I would like to see a video combining all 3 modifications, and the results after each one. For example You've shown what reducing the Torque Adder by 30% does, so take that result and reduce the Trans Time by 30% and show the results of that combination, then reduce the Output Torque Factor and show those results. I'm thinking about trying it on my personal vehicle and seeing what happens. Although I'll probably wimp out a little and start with 15 or 20%. all I can do is make the changes and run the HPT scanner and check the combined results. also when I'm messing around with the transmission I always log the transmission temperature to make sure what I'm messing with isn't changing the fluid temperature much.
This is such amazing content, thank you again!! After watching all of this, there is obviously a ton of stuff that I misunderstood about what HP Tuners was telling me in the descriptions, and I have a lot more work to do.... Maybe now it's even possible that I might be able to get a lot closer to 100% of the result I was hoping for. I'm already a lot happier with the trans than I was with the factory tune in it, so that would be fantastic.
By the way, apparently Holley is coming out with 6L80e/6L90e trans control in their Terminator X Max ECUs, so I am curious how their parameters will be set up compared to what is there in HP Tuners.
Hello Shawn, I am really enjoying your video series on these transmissions. I have performed a good bit of tuning concerning the GM allowed slip of the converters but have done very little concerning shift pressures and timing as I would like to know exactly what I am changing prior to doing so. One thing that may be holding you back so to speak is the "Driver Demand-A" Table for it appears that GM has this set up on the conservative side. I have a 2014 Silverado with a 5.3 and a 2015 Yukon with a 5.3 as well. On both of these vehicles I have multiplied the last row by 1.10, then the last two rows by 1.10 & then the last three rows by 1.10 to blend in the change. It made a significant change to both of these vehicles in terms of wide open performance. Just my 2 cents. Please continue with the research. Thanks again.
Very interesting! I'll have to experiment with that. Thanks!
Good job!
Wow! Thank you so much.
Good morning, pls do a teaching aid on, heating vs cooling function, when ATF flows into the lower part of the engine's radiator.
The lower part radiator acts as a heater, especially important, during the 1st 20 minutes of starting during freezing winter conditions.
My understanding if the cars never operate in night or day temperature of below 80F we can actually bypass ATF fluid and route it thru external air cooler placed in front of car's air conditioner condenser. This will get rid of the possibility of coolant leaking into ATF which will seriously damage the AT. Regards
Depends what vehicle it is. 14+ gm has a cooler bypass block to get the trans to operating temps quicker. A delete kit getting rid of that is always best. Bypassing radiator cooler is always best, running 2 heavy duty external coolers will always lower trans temps, a cool running transmission is a happy transmission!
@@2025s_truth-speaker I think optimum transmission fluid is around 180 to 190F. True?.
@whlawson5812 I seen a recall changing the trans thermostat to about 150ish...so not sure on Optimal temp.
Can anyone download these files you speak of?
It would be amazing if you could sit down with an actual engineer for this transmission and have them explain all these tables.
I had the pleasure of doing a ride along with the calibration engineer for the car 8 and 10 speeds. Enlightening.
@@jessemurray1757 it would have been cool if you could have recorded the ride along. What an opportunity.
@@isidrosevier1125 Naw, I mean he was a coworker. I worked at the Proving Grounds from 14-19. I got to work on and see all the LT based stuff develop. Exciting time to be a car guy....every other day there was a supercharged this and Turbo that coming through the shop. Also, I've been calibrating for over 20 years so the questions I had were stuff like. Why does GM use 7 different tunes for the exact same drivetrain?? Or why are some tuned on the ragged edge while others are really tame. You know, stuff like that. Or IDK....why does my Camaro have 2000 miles on it and the torque converter chatters??? LOL everything else I already know. Or at least don't have any questions.
@@jessemurray1757 I would love to sit down with one of the engineers of the tables and ask all the questions. Then sit with the hp tuner guys and ask all the questions about their tables. I play around just tuning my own. Learning from all the different tuners on UA-cam.
@@isidrosevier1125 the software GM uses is completely different. And the HPTuners guys are only interested in the next platform they can "support"