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  #13  
Old 12-31-2010, 12:10 AM
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Re: Awesome Select Terrain Video

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Originally Posted by MSCA View Post
Yeah, but he had the tach well above idle and the speedo was still on zero. How is that possible if he was in gear and on the gas?
Thats the point. Even if you rev the engine you don't spin the tires so you don't slip or get stuck. My Trailblazer does this too. Start on a patch of ice or snow in 2nd gear and the tires start to move so slow that you start moving forward with no or minimal slipping. I'm sure if he had it in Auto mode and shifted into 2nd manually ( if the selector allows you to) the same thing would happen.
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Old 12-31-2010, 09:53 AM
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Re: Awesome Select Terrain Video

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Originally Posted by carlosmp View Post
Thats the point. Even if you rev the engine you don't spin the tires so you don't slip or get stuck. My Trailblazer does this too. Start on a patch of ice or snow in 2nd gear and the tires start to move so slow that you start moving forward with no or minimal slipping. I'm sure if he had it in Auto mode and shifted into 2nd manually ( if the selector allows you to) the same thing would happen.
Watch the video again.

In both AUTO mode and SAND/MUD mode, the tires began slipping and the speed went up to about 10 right after the tach showed in increase in RPM. You also see the traction control light come on right away and you hear the clicking as the vehicle tried to limit wheel spin.

But then when he does the same thing is SNOW mode, he gets the tach up to 2000 RPM (higher than his other attempts in the other modes), yet the speedo shows zero and no traction control light or clicks are heard. This seems very strange to me. At 2000 RPM, either the tires should be spinning or the traction control should be clicking away to brake the spinning wheel(s). It appeared that neither was happening. I wonder if he had his foot on the brake pedal while he hit the gas as the same time?
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Old 12-31-2010, 09:55 AM
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Re: Awesome Select Terrain Video

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Originally Posted by rdalcanto View Post
He said he is on a steep hill. I'm sure he didn't have snow tires, otherwise I'm sure Auto would have gotten him moving.
I know what he said, but there's no way that's a steep hill. It can be hard to tell from the video, but my guess is that it's less than 10 degrees, not the 15-20 he claimed.
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Old 12-31-2010, 10:09 AM
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Quote:
Originally Posted by MSCA View Post
Watch the video again.

In both AUTO mode and SAND/MUD mode, the tires began slipping and the speed went up to about 10 right after the tach showed in increase in RPM. You also see the traction control light come on right away and you hear the clicking as the vehicle tried to limit wheel spin.

But then when he does the same thing is SNOW mode, he gets the tach up to 2000 RPM (higher than his other attempts in the other modes), yet the speedo shows zero and no traction control light or clicks are heard. This seems very strange to me. At 2000 RPM, either the tires should be spinning or the traction control should be clicking away to brake the spinning wheel(s). It appeared that neither was happening. I wonder if he had his foot on the brake pedal while he hit the gas as the same time?
If the Snow mode starts the Jeep from a dead stop in Second gear it is very possible for the tach to hit 2000rpm and the wheels not turn yet. All depends on the torque converter stall speed.
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  #17  
Old 12-31-2010, 10:19 AM
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Re: Awesome Select Terrain Video

There is no way that hill was a 15-20 degree slope he would have never made it up with normal tires.
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Old 12-31-2010, 10:38 AM
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Re: Awesome Select Terrain Video

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There is no way that hill was a 15-20 degree slope he would have never made it up with normal tires.
Yeah, it looked almost like level ground. I'm sure he was on a hill, but not a steep one....
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Old 12-31-2010, 11:31 AM
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Re: Awesome Select Terrain Video

Guys, why would you doubt that he was on a hill? NOT being on a hill makes it even harder to explain the observed behavior.

Unless you're now going to say that the video was faked? Then we can all jump down the rabbit hole!
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Old 12-31-2010, 12:22 PM
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Re: Awesome Select Terrain Video

Nobody is saying he wasn't on a hill. But I don't think that hill was steep at all. Like I said, probably less than 10 degrees. Actually, if you think about it, he appears to be on the shoulder (or a closed lane) of a highway. Most highways don't exceed an 8% grade. A little basic trig will provide the angle of an 8% grade.
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Old 12-31-2010, 02:20 PM
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Re: Awesome Select Terrain Video

Uphill, downhill, level.......there was a clear difference in how the vehicle moved (or lack of movement), which was the point of the guys video I am sure. Some people will argue over anything......maybe Jesus came down and started pushing him.
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  #22  
Old 12-31-2010, 02:35 PM
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Re: Awesome Select Terrain Video

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Originally Posted by mrpositraction View Post
Uphill, downhill, level.......there was a clear difference in how the vehicle moved (or lack of movement), which was the point of the guys video I am sure. Some people will argue over anything......maybe Jesus came down and started pushing him.

Selec-Terrain : Auto, Sport, Mud/Sand, Rock, and Jesus Modes
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  #23  
Old 12-31-2010, 02:37 PM
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Re: Awesome Select Terrain Video

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Originally Posted by xmonger View Post
Selec-Terrain : Auto, Sport, Mud/Sand, Rock, and Jesus Modes

Your doesn't have that?

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  #24  
Old 12-31-2010, 02:40 PM
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Re: Awesome Select Terrain Video

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Originally Posted by carlosmp View Post
I believe that one of the changes with selecting Snow mode is that the transmition starts in 2nd gear, not in first, so tires dont spin when you hit the gas. I read this somewhere but I can't recall where. I'll post it back if I can find it.

Yes, I just looked it up, here is what Jeep says about snow mode:

SNOW
  • Standard Electronic Brake Controls
  • 50/50 torque split
  • 2nd Gear launch from a standstill
  • Air Suspension at Normal Ride Height (if equipped)

And, here are the other settings explained:

AUTO
  • Standard Electronic Brake Controls
  • Torque on Demand
  • Air Suspension at Normal Ride Height (if equipped)

SPORT
  • Traction Control Limited
  • Up to 80% rear drive torque split
  • Air Suspension at AERO (if equipped)
MUD/SAND
  • Off-Road Electronic Brake Controls
  • 50/50 torque split
  • Air Suspension at Off-Road 1 (if equipped)
ROCK
  • Off-Road Electronic Brake Controls
  • 50/50 torque split
  • Air Suspension at Off-Road 2 (if equipped)
  • Available in 4LO only


Taken from: http://www.jeep.com/en/2011/grand_ch...d_performance/
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