Recent content by RobH
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Cooling fan runs after engine shutdown
Here's your $5 Doubeleive. A month and a half ago, my fans turned on high speed and the coolant temp when to full scale low. When I turned off the engine, the fans stayed on for several minutes. Next time I started up, the fans came on and then went off. My ScanGauge II said the coolant temp...- RobH
- Post #9
- Forum: Engine & Drivetrain
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Just had my 6l80 in my 2019 Yukon rebuilt .98k miles. Wondering if I got taken to the cleaners on the build.
I paid $6,000 in May, 2023 for a GM reman with a 3 year /100,000 mile warranty good at any GM dealer. Since I travel, the "anywhere" was the decider for me. I got the HP Tuner package to disable the displacement on Demand (DOD) / Active Fuel Management (AFM) switching back and forth from V8 to...- RobH
- Post #16
- Forum: Engine & Drivetrain
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HP Tuner for 2016 Tahoe L83/6L80
What I described is valid for my 2016. It may be different for a 2011. My 2016 Engine Control Module (ECM) has the capability to set the AFM to Enabled above 0 mph (my factory setting), enabled above some speed, or disabled. I set mine for disabled, and set the enabled above speed to 200 mph...- RobH
- Post #38
- Forum: Performance
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HP Tuner for 2016 Tahoe L83/6L80
Automatic Fuel Management (AFM) or Displacement on Demand (DOD). Anytime the Engine Control Module decides that not much power is needed, it will switch to V4 mode. Switching back and forth from V4 to V8 to V4, etc. all involve torque converter clutch slippage. I can be cruising on the...- RobH
- Post #36
- Forum: Performance
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HP Tuner for 2016 Tahoe L83/6L80
I left the torque converter lockup essentially stock. I did set the target slippage to 0 (zero). HP Tuners recommended doing so and said that the 6L80 in the Corvette was set to zero target slippage. Since I don't try to be the first from one stoplight to the next, there is no harshness. The...- RobH
- Post #34
- Forum: Performance
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HP Tuner for 2016 Tahoe L83/6L80
I have described how I set my TCM's shifting schedule speed parameters in this thread's post # 18 on page 2.- RobH
- Post #31
- Forum: Performance
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HP Tuner for 2016 Tahoe L83/6L80
You can do it with a desktop which has a USB port. You'd carry the desktop out to the car and connect it to the MPVI3. The only risk is the fact that the desktop does not have an internal battery. So there might be an issue with spurious electronic currents from the desktop power supply...- RobH
- Post #20
- Forum: Performance
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HP Tuner for 2016 Tahoe L83/6L80
This post describes my using the HPT VCM Editor for customizing upshift and downshift speeds in each of the six gears. My goal was to avoid putting a load on the engine at low RPM ("lugging the engine"). I can still use the Manual mode with the up and down rocker switch on the shift lever if I...- RobH
- Post #18
- Forum: Performance
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HP Tuner for 2016 Tahoe L83/6L80
I used the following video for information on how to modify my transmission's Transmission Control Module (TCM) to set the target slip for the Torque Converter clutch (TCC) to zero. HPT 6L80 Tuning 101 After replacing the Tahoe battery, before doing any HPT stuff, the dashboard center display...- RobH
- Post #17
- Forum: Performance
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HP Tuner for 2016 Tahoe L83/6L80
Vehicle Control Module "programming" rough explanation. I don't know the actual approach that GM used. Typically there is an operating program installed/written in the control module, be it the Engine Control Module, ECM, which is a box in the engine compartment, the Transmission Control...- RobH
- Post #16
- Forum: Performance
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HP Tuner for 2016 Tahoe L83/6L80
Per my post # 11 above, I have already decided to ride the HP Tuners (HPT) horse, a result of my online research and viewing videos which showed the HPT product in use. From here on, please let's use this thread to describe my experience for others who may be considering the HP Tuners product...- RobH
- Post #15
- Forum: Performance
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2017 Escalade versus 2016 Tahoe for Towing
The newer Tahoes do not have the ground clearance of the older straight axle truck Tahoes. They are for driving the kids to soccer practice in town. Check the pictures above. Here is another up on the Bighorn mountains. Two miles up a rutted muddy road from the pavement. One of my nephews...- RobH
- Post #21
- Forum: Engine & Drivetrain
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2017 Escalade versus 2016 Tahoe for Towing
I'm running a tank of 90 octane to compare MPG improvement. 11.0:1 is high compression, but, at part throttle, there is less fuel/air mixture to compress. I recognize that I will have more total power available with 91-93 octane, and increased MPG with more pressure on the loud pedal, but I...- RobH
- Post #19
- Forum: Engine & Drivetrain
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Passenger lifter failure 79k 10/22, now Driver 107k.
The Auto Fuel Management (AFM). You can disable it electronically (AFM disable) and, if desired, also replace the AFM hardware (AFM delete). You can see more at my post #11 at https://www.tahoeyukonforum.com/threads/hp-tuner-for-2016-tahoe-l83-6l80.148349/page-2- RobH
- Post #6
- Forum: Engine & Drivetrain
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Constant repairs - 2017 Yukon XL SLT 4WD 5.3 Flex
I hear your pain. My transmission went bad at 121K miles a thousand miles from home last year. I skipped part of the trip and was able to get home by babying the transmission. Then bought a GM reman transmission to get the three year/100,000 mile warranty good at any GM dealership in the...- RobH
- Post #7
- Forum: Engine & Drivetrain
