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Author Topic: noticed another significant difference in 08 vs 11 tranny  (Read 2606 times, 18 Replies)
REDCXL
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« on: July 05, 2011, 10:34:03 PM »

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 Cheers
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rbarrios
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« Reply #1 on: July 05, 2011, 11:50:00 PM »

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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« Reply #2 on: July 18, 2011, 11:03:31 PM »

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. wink
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rbarrios
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« Reply #3 on: July 19, 2011, 12:28:49 PM »

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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Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.
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sciond
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« Reply #4 on: July 19, 2011, 12:43:14 PM »

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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« Reply #5 on: July 19, 2011, 03:23:01 PM »

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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rbarrios
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« Reply #6 on: July 19, 2011, 03:32:31 PM »

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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« Reply #7 on: July 19, 2011, 03:42:46 PM »

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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« Reply #8 on: July 19, 2011, 06:44:38 PM »

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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« Reply #9 on: July 19, 2011, 07:30:48 PM »

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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REDCXL
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« Reply #10 on: July 19, 2011, 10:08:30 PM »


"I go from 65 to 85 going down grades in D, with no gas input."
Thats how I got my first speeding ticket in 40 years with my 08. Bang Head
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« Reply #11 on: July 20, 2011, 10:01:31 PM »

There is essentially very little engine braking on the '08 Enclave. In fact, contrary to what would be expected from a frictionally challenged AWD, my AWD Enclave is quite a free wheeler. It seems to catch up to almost all other vehicles when rolling down hills, requiring more brake application than the vehicles ahead of mine. It may be annoying, but I suspect that it may help to improve fuel economy slightly. wink
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GoldEnclave
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« Reply #12 on: July 20, 2011, 10:11:49 PM »

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. wink

Here's the link to the thread discussing the hill logic option from lzwhb2 (GM's lambda transmission programmer):

http://www.enclaveforum.net/index.php?topic=3047.msg40479#msg40479

BTW, please ignore the break brake misspelling fiasco distraction within the thread. Embarrassed
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goochman
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« Reply #13 on: July 21, 2011, 12:23:09 PM »

There is essentially very little engine braking on the '08 Enclave. In fact, contrary to what would be expected from a frictionally challenged AWD, my AWD Enclave is quite a free wheeler. It seems to catch up to almost all other vehicles when rolling down hills, requiring more brake application than the vehicles ahead of mine. It may be annoying, but I suspect that it may help to improve fuel economy slightly. wink

Mine is the opposite unless you are going down a steep hill.  Under 30 mph my '08 def tranny breaks.  I had the last flash avail.
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rbarrios
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« Reply #14 on: July 21, 2011, 01:32:38 PM »

Here's the link to the thread discussing the hill logic option from lzwhb2 (GM's lambda transmission programmer):

http://www.enclaveforum.net/index.php?topic=3047.msg40479#msg40479

BTW, please ignore the break brake misspelling fiasco distraction within the thread. Embarrassed


ahhh- had never seen that thread....
and I guess dictionary man never came back?
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« Reply #15 on: July 23, 2011, 05:54:35 PM »


ahhh- had never seen that thread....
and I guess dictionary man never came back?

Nope. PAPoPo booted him. police Last I heard, he's (PAPoPo) driving a Hyundai Veracruz. He traded in his 2008 Enclave with its long list of problems, but I understand that his Veracruz needed a new engine when it had less than 10,000 miles on the odometer. Some of us have no luck with CUVs. so sad
« Last Edit: July 24, 2011, 12:03:50 PM by GoldEnclave » Logged

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« Reply #16 on: July 24, 2011, 09:34:06 AM »

I would like to comment to be careful overriding the hill descent downshifting feature.

About a year ago we were on I-15 between L.A. And Vegas.  Near the CA-NV border, there are some pretty good mountain passes, and on the big final downhill northbound before Primm, I got irritated with the engine braking and dropped the tranny into neutral.  I was quickly up to 80-85 mph.  Things were great until I came around a bend, and due to a slower moving vehicle trying to overtake some trucks, traffic had slowed to 55.  I had to slow the E down, fairly quickly, and then keep applying the brakes for a bit.  In the desert heat, the E's brakes overheated quickly which significantly compromised my braking.  I quickly re-engaged the tranny and downshifted to L3 for the remainder of the hill.  I kept the speed low for awhile, and the brakes recovered within a few miles.

I had the brakes checked by my dealer when I got back home, telling them what had happened.  The service tech claimed that they checked out fine, and I have had no problems since.  But I definitely now let the downhill downshifting feature do it's thing!
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Bigbit

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« Reply #17 on: July 24, 2011, 12:06:21 PM »

Overall, I would think that the hill descent feature, which is also functional in cruise control mode, is a nice function to have, especially on a brake burning behemoth like the Enclave. wink
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« Reply #18 on: July 24, 2011, 04:40:15 PM »

Overall, I would think that the hill descent feature, which is also functional in cruise control mode, is a nice function to have, especially on a brake burning behemoth like the Enclave. wink
here is where I disagree...
brake repairs very cheap and can be easily repaired in my garage
transmission wear and tear very costly
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