noticed another significant difference in 08 vs 11 tranny - EnclaveForum.net: Buick Enclave Online Community
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post #1 of 19 (permalink) Old 07-05-2011, 10:34 PM Thread Starter
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noticed another significant difference in 08 vs 11 tranny

We took a trip today in the 11 and noticed something the 08 did not do.
With cruise set at 55, and going downhill, 08 did not shift down to give engine braking, and did pick up a little speed. The 11 shifted down and held speed at cruise setpoint. even raised RPM to 4K.
Incidentally, the trip was 1/2 flat two-lane and 1/2 MOUNTAIN. We live at 2K, went to the valley floor and back up to 8K. had several waits with flagman, ran A/C (temp ranged from 72 at 8K to 105 on valley floor. Whole trip close to 200 miles gave me a total of 20MPG! Not bad IMHO

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post #2 of 19 (permalink) Old 07-05-2011, 11:50 PM
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Re: noticed another significant difference in 08 vs 11 tranny

yup thats hill descent/engine grade braking taking control. and as you can see- it hitting 4K will use up gas.
If some of the downhill portions are long and not winding-- and you can simply cruise--
set it to L-6. Engine braking is disabled in L.
If you need to use engine braking- manually shift to L5 or L4 etc.
But youll see an MPG diff in L6.

I wonder if the 08s had Engine grade braking...

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post #3 of 19 (permalink) Old 07-18-2011, 11:03 PM
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Re: noticed another significant difference in 08 vs 11 tranny

When lzwhb2 was programming the 2009 lambda's transmission, he asked the forum's opinion about the addition of automatic hill descent logic engine braking, which was not a feature in the 2007-2008s. I remember thinking that it would be a good idea. I hope that most 2009+ lambda drivers like the feature.

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post #4 of 19 (permalink) Old 07-19-2011, 12:28 PM
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Re: noticed another significant difference in 08 vs 11 tranny

Its a very interesting feature.
And it annoys some people. But since most people dont read the manual-- they dont know that it can be overidden by shiftin to L.

On hills- I do- L6. and its smooth glidding down the hills.

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post #5 of 19 (permalink) Old 07-19-2011, 12:43 PM
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Re: noticed another significant difference in 08 vs 11 tranny

It does annoy me sometimes..especially when mine was doing it on a flat grade...however going through the mountains I like it

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post #6 of 19 (permalink) Old 07-19-2011, 03:23 PM
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Re: noticed another significant difference in 08 vs 11 tranny

Mine does it and I do find it annoying. I just flip the CC off while I'm going down hills and reset it at the bottom.

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post #7 of 19 (permalink) Old 07-19-2011, 03:32 PM
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Re: noticed another significant difference in 08 vs 11 tranny

Quote:
Originally Posted by ORV
Mine does it and I do find it annoying. I just flip the CC off while I'm going down hills and reset it at the bottom.
Even with cruise control off- and in D- if the computer senses you are stepping on the brake- and or the vehicle is speeding up with no gas pedal input- it will initiate Descent control.
Theres times you just want to take advantage of gravity and cruise down the hill-- and this doesnt let you.

Just shift to L6.
My most recent use on a long steep hill (7% grade).
I was in the slow lane at 55 (my usual highway speed)--- and was in L6- as I went down the hill- I had to move over to the left lanes-- as the vehicle sped up going downhill all on its own- I believe I hit 80- or 85. No gas pedal input.
Once at the bottom- I began to move over to the right-- as I slowed down to 55.
In D- this never would have happened.. engine would be revvin higher to slow down vehicle.

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post #8 of 19 (permalink) Old 07-19-2011, 03:42 PM
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Re: noticed another significant difference in 08 vs 11 tranny

Just drove through the West Virginia mountains the past two weekends and noticed the automatic downshift for the first time. I first noticed it with cruise on and later with cruise off. Did not find it too annoying. Kept me from having to use the brake. My 2008 did not have this feature.

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post #9 of 19 (permalink) Old 07-19-2011, 06:44 PM
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Re: noticed another significant difference in 08 vs 11 tranny

Quote:
Originally Posted by rbarrios
Even with cruise control off- and in D- if the computer senses you are stepping on the brake- and or the vehicle is speeding up with no gas pedal input- it will initiate Descent control.
Theres times you just want to take advantage of gravity and cruise down the hill-- and this doesnt let you.

Just shift to L6.
My most recent use on a long steep hill (7% grade).
I was in the slow lane at 55 (my usual highway speed)--- and was in L6- as I went down the hill- I had to move over to the left lanes-- as the vehicle sped up going downhill all on its own- I believe I hit 80- or 85. No gas pedal input.
Once at the bottom- I began to move over to the right-- as I slowed down to 55.
In D- this never would have happened.. engine would be revvin higher to slow down vehicle.
Not necessarily true, at least not in my car. On a regular basis I go from 65 to 85 going down grades in D, with no gas input. I drive this route 2 to 4 times a week and experience this often. Perhaps they changed that the next year. Mine will shift down heavily in CC OR if I hit the brakes, but not just coasting down hill. The only thing I see odd is that the RPM while coasting will stay up around 1700 to 1800, when idling it's generally around 1000.

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post #10 of 19 (permalink) Old 07-19-2011, 07:30 PM
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Re: noticed another significant difference in 08 vs 11 tranny

I have noticed recently that if you are driving down a hill and you press on the brake (not hard enough to slow down but hard enough where you don't speed up at all) the RPMs drop to about 800. As soon as I let off of the brake (I mean immediately) the RPMs will jump to somewhere between 1-2K depending on my speed. This happens in both D and L6. I wish it would just stay down at 800 RPM until I press the gas pedal again.

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