Question About How The New Tundras "Coast" - TundraTalk.net - Toyota Tundra Discussion Forum
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post #1 of 11 (permalink) Old 05-19-2017, 11:41 AM Thread Starter
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Question About How The New Tundras "Coast"

So I recently picked up a new 2017 DC 4x4 with the 5.7 gas motor. I bought this truck from a Toyota dealer that was located right below an extremely steep pass and had the chance to make an interesting observation and comparison about how the truck coasts.

I originally was interested in a 2015 Toyota Certified truck at this same dealer, pretty much exact same model as the truck I got, being a DC with 4x4 and the 5.7 gas motor. This truck had 12k on it.

I drove the certified truck first and went up that pass. On the way back down, for a couple of miles, the truck pretty much coasted all the way down at 70-75 mph. I don't think I even had to hit the gas pedal once. It felt very smooth.

But then I drove my 2017 truck next with 5 miles on it and went up the same pass. On the way back down, my truck did not coast as freely or easily. I had to keep my foot on the gas to maintain 70-75 mph. If I let off the gas, the truck would start slowing down a bit, as if the governor or computer was regulating the engine.

Just wondering about why both trucks felt very different going down the pass. Does my truck and its computer just need some time and a few miles to settle in or something like that?
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post #2 of 11 (permalink) Old 05-19-2017, 03:58 PM
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Transmission was holding you back. My 2008 Tundra does this. Its part of the "intelligent" stuff. It will upshift and downshift to maintain speed, and act as an engine brake going down hills. Its even more aggressive in tow/haul mode.
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post #3 of 11 (permalink) Old 05-19-2017, 04:21 PM Thread Starter
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Thanks Wildbill, why would the 2015 truck feel different going down that hill, though? Transmission programming differences?
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post #4 of 11 (permalink) Old 05-19-2017, 04:44 PM
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I would bet it's a transmission learning thing. The new one hasn't had any time to learn anything, the older one has. I could be wrong but that's the first thing that popped into my head.

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post #5 of 11 (permalink) Old 05-19-2017, 08:46 PM
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Here's some additional information:
6-speed-shifting.pdf

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post #6 of 11 (permalink) Old 05-20-2017, 05:25 PM
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Thanks Wildbill, why would the 2015 truck feel different going down that hill, though? Transmission programming differences?
Transmission programming difference, plus you are driving a brand new truck, it takes time for it to learn your driving habits and adjust...also, anytime the battery is disconnected in the future it will have to go through the learning phase again.
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post #7 of 11 (permalink) Old 05-21-2017, 01:33 AM
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Not to mention the driveline hasn't been broken in on a brand new truck yet.
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post #8 of 11 (permalink) Old 05-22-2017, 02:55 PM Thread Starter
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I am just sort of starting to notice how "aggressive" the truck is in slowing down or automatically self-braking every time I get off the gas. Seems to happen at all speeds. My truck really does not seem to coast freely at all or continue to maintain the same speed once I take my foot off the gas pedal.

Does this ever go away? Based on what I observed in driving the 2015 truck, I would hope so. Just kind of wondering how long it will take? Driving this truck is quite different from what I am used to.

Does your truck have similar characteristics?
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post #9 of 11 (permalink) Old 05-22-2017, 03:37 PM
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My 2015 Platinum with almost 34k miles does exactly as you describe(slows down / downshifts aggressively). Always has. It drives the same now as it did when I purchased it new in July '15. Based on my experience, I wouldn't expect it to change. It doesn't bother me, I actually prefer it, so I haven't had it looked at by the dealer (actually I've never had it back to the dealer for anything).

Hope this helps.

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post #10 of 11 (permalink) Old 05-22-2017, 10:02 PM
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post #11 of 11 (permalink) Old 05-23-2017, 10:42 PM
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My 2017 coasts just fine with about 6K miles on it. But, it is the 4.6L without the power trailer brakes or towing package. Possible something in the towing setting in the transmission? Sounds like it is behaving as an engine brake.
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