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TundraGeneral discussion forum for the 2007 and later Toyota Tundra.
This is a discussion thread titled "Engine braking down long steeps hills - per design?", within the Tundra forum, part of the Truck Forums category.
Engine braking down long steeps hills - per design?
Hello folks.
New Tundra owner. 5.7 6 spd. When going down a long (2 mile) hill/road, right around 38-40 mph the engine seems to go into an auto engine breaking mode. Reminds me of downshifting too low in a manual transmission on a hill.
I have to either slow way down or give it a lot more gas to get out of this range on hills. Is this as per design?
Re: Engine braking down long steeps hills - per design?
Quote:
Originally Posted by a_gunslinger
Hello folks.
New Tundra owner. 5.7 6 spd. When going down a long (2 mile) hill/road, right around 38-40 mph the engine seems to go into an auto engine breaking mode. Reminds me of downshifting too low in a manual transmission on a hill.
I have to either slow way down or give it a lot more gas to get out of this range on hills. Is this as per design?
Thanks!
This grade logic is one of my favorite features. If you do a lot of mountain driving you will come to appreciate it.
__________________ 07 DC SR5 TRD 4x4 5.7 TRD exhaust, 35K miles, 17 mpg city after battery disconnect reset & removing extra (charcoal?) air filter. Truxedo Lo-Pro with deck rails.
Rear Susp: ProComp ES3000 #326510 (2.25" taller than stock), 1.25" blocks plus PRG mini-pack (http://www.tundrasolutions.com/forum...and-new-truck/) gives 2.25" total lift, parking brake cable bracket spacers, wheel well height 43."
Front diff and rear ds drop; trailer hitch electrical harness tucked up above bumper.
After 20K miles swapped 305/65/18 BFG AT for 285/75/18 Toyo AT, still on stock 18x8x60 offset TRD wheels, about 1/8" clearance to sway bar. Like the extra height but miss the width. Next time either 305/70/18 or 35x12.50/18.
Added 5th 285/75/18 Toyo AT as spare. Foam pad above spare to help with bed bounce.
Bed Bounce: Stiffer E-tires are worse than stock P-metric; biggest improvement from PRG mini-pack, slight improvement from shocks and foam pad above spare. Still a stiff ride but tolerable now.
Best things about this truck: 5.7 and transmission, interior size and comfort, very quiet at high speed.
Worst things about this truck: bed bounce, no VSC in 4wd, mileage sucks above 70.
Re: Engine braking down long steeps hills - per design?
Quote:
Originally Posted by dmtalon
Our manuals must be different.. Page 192 isn't in 1-7. I'm still looking for it I'm certainly not doubting it's existence, I just can't find it!!
Must be too much BEER !!!!!!!!!!
__________________ Black 2007 D/C Limited 4x4, seems to have ALL the options, Flowmaster Dual Delta 40's, K&N drop in filter, Rhino Liner', 3" frt 1" rear Daystar leveling kit, BFG Radial All Terrain TA's 305x65x18, Moto Metal M0951's in Chrome 18x9. Fully DeBadged , Stebel horn, C/W grill, Production date 8/07
all that is remaining is:
Black Mod Headlights,
2000 BMW 323i 1997 Chevy Tahoe Sport 4x4
"Some people spend an entire lifetime wondering if they made a difference. The MARINES don't have that problem." President Ronald Reagan 1985
Re: Engine braking down long steeps hills - per design?
Quote:
Originally Posted by a_gunslinger
Hello folks.
New Tundra owner. 5.7 6 spd. When going down a long (2 mile) hill/road, right around 38-40 mph the engine seems to go into an auto engine breaking mode. Reminds me of downshifting too low in a manual transmission on a hill.
I have to either slow way down or give it a lot more gas to get out of this range on hills. Is this as per design?
Thanks!
This thread had some more info in it about this feature. Hill decent system
__________________
2007, 5.7, Double Cab 4x2, Blue Streak, SR5
Re: Engine braking down long steeps hills - per design?
Quote:
Its a good feature, but if you don't want to use it, drive in S mode. It is deactivated in this mode.
it works awesome going down Mountain passes, used s mode too, but only when slow traffic was in front of me. everyone else is braking and you are just letting the train do the work.
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Engine braking down long steeps hills - per design?
I'm certainly not doubting it's existence, I just can't find it!!
Linear Mode
