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Old 10-15-2016, 01:25 PM   #1
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2015 23' FB Flying Cloud
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Downhill Engine Braking

I have a 2013 GMC Yukon XL, 6.2 L gas. I have towed over the I-5 Grapevine and other steep passes here on the West coast. When the engine down shifts my rpms go 4000-4500. As TV/AS slows down I tap the accelerator to drop the rpms. Should I worry about letting the rpms run high for more than a few seconds. I do try to keep my speed down while keeping my braking to a minimum. Any thoughts? (2015 AS 23 FB)

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Old 10-15-2016, 01:29 PM   #2
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4-5K is not that high when braking. Youre fine.

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Old 10-15-2016, 01:31 PM   #3
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Check where the red line is for your engine. I think you're well within it but it's good to know to be sure.
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Old 10-15-2016, 02:29 PM   #4
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You need the higher rpm to get the compression braking, that's how it's designed to function. As mentioned, you don't want to exceed the redline (maximum) rpm, I would think the engine would have protection for this, perhaps shifting back up a gear. Protects your engine and their warranty.
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Old 10-15-2016, 02:34 PM   #5
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On a long hill, one that tend to cause acceleration while off the throttle, it is better to set you gearing at the top of the hill and descend the hill in the same gear you climbed the hill in. Tapping the brakes frequently while going down that type of descent you are running the risk of overheating them and losing them at which point it is time to look for the run off ramp.

if you did not set the trans at the top of the hill and your TV has tow haul mode, and you are using it, it should downshift and set the trans the first time you tap the brakes.
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