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Old 09-21-2014, 07:29 AM
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Selec-Speed ... How does it work?

Help me out please. How does Selec-Speed work?


Selec-Speed is part of the QT11 and QD11 WK2 3032 Transfer case.

The Owner Manual says models fitted with the 3032 Transfer cases have Selec-Speed AND
"When Selec-Speed or Hill Descent Control is enabled, Paddle Shift mode is not active. Pressing the (+/-) shift paddles in Selec-Speed or Hill Descent Control simply limits the highest allowed gear. Shifts below and up to that gear will occur automatically
"

BUT .... elsewhere on this site
"Selec-Speed Control
Selec-Speed Control with Hill-ascent and Hill-descent Control allows drivers to control Grand Cherokee's speed both up and down steep, rugged grades with the steering wheel paddle shifters - without the need for throttle or brake pedals (late availability on EcoDiesel)."


Do the padddle shifts just select the highest gear (Owner manual) or vary the speed of hill decent/hill accent?

Thanks

Rob


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  #2  
Old 09-21-2014, 07:46 AM
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Re: Selec-Speed ... How does it work?

The first paragraph seem to describe a GM system.

The second one is how the Jeep works.

This make me wonder if owners manuals are outsourced to companies that write them for multiple companies. It would sure explain the numerous errors, and the need for Jeep to now have 8 versions for the 2014 model year.


This is from the GMC Terrain users guide;

"Electronic Range Select (ERS) Mode
The Electronic Range Select mode allows the driver to manually select the range of gear positions. This feature can be used to limit the top gear while towing or to downshift when driving on a downhill grade to provide engine braking. ERS is not designed to provide sportier performance or to be used to shift gears similar to a manual transmission.



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Old 09-21-2014, 07:56 AM
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Re: Selec-Speed ... How does it work?

Quote:
Originally Posted by bill_de View Post
The first paragraph seem to describe a GM system.

The second one is how the Jeep works.

This make me wonder if owners manuals are outsourced to companies that write them for multiple companies. It would sure explain the numerous errors, and the need for Jeep to now have 8 versions for the 2014 model year.
I just re-checked the Owner Manual quote (page 421) ... the front cover says Grand Cherokee.

Thanks .... so do the paddles accelerate and decelerate then?

I have to add that it was somewhat disconcerting to see that the 3.6L engine is not even listed in the Service chart of the Owner Manual given to me with the new car in late July 14... and the fuse numbering in the manual is different to that on the fuse box lid .... poor finishing off for what could be a great car

Regards

Rob
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Old 09-21-2014, 11:03 AM
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Re: Selec-Speed ... How does it work?

The paddles just change gears. And based on the gear you're in, the jeep will speed up and brake accordingly. And hence controlling the speed.


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Old 09-21-2014, 08:23 PM
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Re: Selec-Speed ... How does it work?

To use Select-Speed you must be in 4LO. Then engage the Hill Descent Control which is actually the button for all low speed controls. To engage the Hill Descent or Ascent Control you have to be on an incline, pointing down or up, respectively. The car will know it based on sensors input. on flat ground, you can engage the Select Speed by tapping the paddles. That will essentially limit the crawling speed of the car on both flat terrain as well as up and down hill.

Do NOT engage 4LO on dry pavement. But if you must test it for yourself, find a parking lot ramp and make sure you are not in anyone's way and drive really slowly
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Old 09-21-2014, 11:53 PM
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Re: Selec-Speed ... How does it work?

Quote:
Originally Posted by f1anatic View Post
To use Select-Speed you must be in 4LO. Then engage the Hill Descent Control which is actually the button for all low speed controls. To engage the Hill Descent or Ascent Control you have to be on an incline, pointing down or up, respectively. The car will know it based on sensors input. on flat ground, you can engage the Select Speed by tapping the paddles. That will essentially limit the crawling speed of the car on both flat terrain as well as up and down hill.

Do NOT engage 4LO on dry pavement. But if you must test it for yourself, find a parking lot ramp and make sure you are not in anyone's way and drive really slowly
I'll have a go at this when I'm next in the bush.

Regards

Rob
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Old 09-22-2014, 05:42 PM
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Re: Selec-Speed ... How does it work?

Quote:
Originally Posted by f1anatic View Post
To use Select-Speed you must be in 4LO. Then engage the Hill Descent Control which is actually the button for all low speed controls. To engage the Hill Descent or Ascent Control you have to be on an incline, pointing down or up, respectively. The car will know it based on sensors input. on flat ground, you can engage the Select Speed by tapping the paddles. That will essentially limit the crawling speed of the car on both flat terrain as well as up and down hill.

Do NOT engage 4LO on dry pavement. But if you must test it for yourself, find a parking lot ramp and make sure you are not in anyone's way and drive really slowly
4LO on dry pavement doesn't hurt a thing on vehicles that are always in 4wd mode any more than that full time 4wd mode does.
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Old 09-22-2014, 08:23 PM
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Re: Selec-Speed ... How does it work?

Quote:
Originally Posted by lstowell View Post
4LO on dry pavement doesn't hurt a thing on vehicles that are always in 4wd mode any more than that full time 4wd mode does.
For the purposes of our Jeep, yes it does because it binds the axles together using the inherent features of the low gearing transfer case and the brake lock differential. Not only are you forced to drive very slowly but you will be unable to turn easily because the ABS sensors will selectively brake and slow your wheels (exterior ones) down to the speed of the slowest turning wheel. Give it a try if you don't believe me but I am not responsible for damages.
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Old 09-22-2014, 09:06 PM
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Re: Selec-Speed ... How does it work?

Quote:
Originally Posted by f1anatic View Post
For the purposes of our Jeep, yes it does because it binds the axles together using the inherent features of the low gearing transfer case and the brake lock differential. Not only are you forced to drive very slowly but you will be unable to turn easily because the ABS sensors will selectively brake and slow your wheels (exterior ones) down to the speed of the slowest turning wheel. Give it a try if you don't believe me but I am not responsible for damages.

I believe you. And I won't be trying it.


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