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Acura MDX 2007

1249 messages,  Last post on Oct 05, 2009 at 10:34 AM

You are in the Acura MDX Forum. Your Hosts are steve_ & tidester

What is this discussion about? Acura MDX


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#1005 of 1249
Re: Pulling [robertsmx] by varmint
Feb 06, 2007 (10:30 am)
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Replying to: robertsmx (Feb 06, 2007 8:36 am)

With the MDX, the steering is actually torque-sensing rather than speed-sensing. Torque-sensing works off of the engine rpm, rather than the vehicle speed.
 
End result is more or less the same. And I agree that a dealer isn't likely to mess with it.
#1006 of 1249
Re: Pulling [varmint] by robertsmx
Feb 06, 2007 (1:38 pm)
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Replying to: varmint (Feb 06, 2007 10:30 am)

I thought torque-sensing was more of a function of the DBW system, as opposed to power steering system itself.
#1007 of 1249
Re: Pulling [robertsmx] by varmint
Feb 07, 2007 (10:13 am)
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Replying to: robertsmx (Feb 06, 2007 1:38 pm)

Not quite sure what you meant when you wrote, "a function of the DBW system". Are you suggesting the term torque-sensing steering refers to manipulating the throttle rather than the steering? That would be incorrect.
 
In don't have a link handy, so read up on the 2nd gen TL and TL-S. The base model used a speed-sensing design, while the Type S got torque-sensing. With a little digging, you may find a better explanation of the difference between the two designs.
#1008 of 1249
Re: Pulling [barb36jack31] by koho955
Feb 07, 2007 (11:40 am)
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Replying to: barb36jack31 (Feb 06, 2007 6:09 am)

I agree with you about the tires. I have the base model MDX with the Goodyear tires on it. The steering at highway speed is horrible and a ton of work not to mention a rough ride all the time. I just had a dealer loaner for 2 days that was loaded with the Michelin tires on it. What a difference! Great steering and a much smoother ride. I can't beleive that Acura put the Goodyear tires on their cars to save $25 per tire. AMAZING TO SAY THE LEAST!
#1009 of 1249
Re: Pulling [varmint] by robertsmx
Feb 07, 2007 (2:11 pm)
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Replying to: varmint (Feb 07, 2007 10:13 am)

I tried finding out information on torque-sensing part of variable assist steering but most of the returns were related to patents. TL (including base) apparently has torque-sensing variable assist steering as does MDX. But no details on how it helps. RL uses speed sensing variable assist system.
 
Regardless, it is highly unlikely that people looking to reduce assist at lower speeds will get any help at dealerships. It’s a part of the design (greater assist at lower speeds, and reduced assist at high speeds).
#1010 of 1249
Re: Pulling [robertsmx] by varmint
Feb 08, 2007 (7:12 am)
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Replying to: robertsmx (Feb 07, 2007 2:11 pm)

Yes, the current TL and TL-S both use torque-sensing. It was the second generation of the TL that used speed-sensing on the base models. In 2002, the TL-S got torque-sensing, while the base remained speed-sensing.
 
Unfortunately, Acura's media site doesn't provide much detail. This is all that has to say on the subject.
 
The 3.2 TL features a speed-sensitive, variable power assist system designed to complement the model's handling characteristics.
 
By varying the amount of power assist according to vehicle speed, the system provides light steering effort during low-speed parking maneuvers and, as vehicle speed builds, progressively heavier steering effort for a positive and secure feel.
 
The TL Type-S is equipped with an exclusive sport-tuned, power steering system (similar to the CL Type-S). The Type-S uses a torque-sensing rotary valve steering gear that varies the amount of assist according to steering input and the resultant torque generated between the pavement and tire. The system also varies assist based on engine speed, helping make steering light in parking maneuvers and heavier as speed increases for enhanced road feel.

 
Might be a good question for Shawn.
#1011 of 1249
Anyone had the old model and now has the new one? by nickel
Feb 14, 2007 (10:49 am)
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Because I want to know the difference in light offroading without the Differential Lock button that the old model had. Is the new one as adaptable like the old one?
#1012 of 1249
Re: Anyone had the old model and now has the new one? [nickel] by robertsmx
Feb 14, 2007 (1:00 pm)
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Replying to: nickel (Feb 14, 2007 10:49 am)

With VTM-4 as in the old model, lock button was to engage all wheels upto 18 mph. With SH-AWD, the button is unnecessary since all wheels are engaged at all times anyway.
#1013 of 1249
Re: Anyone had the old model and now has the new one? [nickel] by upstatedoc
Feb 14, 2007 (7:46 pm)
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Replying to: nickel (Feb 14, 2007 10:49 am)

Have an '04 and '07 and the former is much better w/ "light offroading" and in deep snow ( just got two feet of it) The '04 will go anywhere I need to go, not so sure about the '07. That being said, the '07 is light years ahead of the previous gen. in everything else.
#1014 of 1249
Re: Anyone had the old model and now has the new one? [upstatedoc] by varmint
Feb 15, 2007 (10:22 am)
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Replying to: upstatedoc (Feb 14, 2007 7:46 pm)

Ditto that. At least in theory.
 
The "lock" feature available with VTM4 not only locked the torque output 50/50 fore and aft, it also locked the rear axle half-shafts in a 50/50 spread. While this is something you would never want to happen on dry pavement, it does give the vehicle an advantage on slick or loose surfaces.
 
On old-school "four-by-fours", they would add devices known as lockers for the same reason. Here's an example of an air-powered locker.
 
SH-AWD can send power left and right between the rear axles, but I've read nothing which suggests the system is programmed to lock the rear half-shafts when one side slips. It is far more likely the VSA system will instead clamp on a slipping wheel using the brakes. That action send power back across the differential to the wheel on the other side. If that other wheel starts slipping, VSA will reduce power from the engine.
 
This combination of SH-AWD and VSA is very effective when the vehicle in on the road and has some momentum. It'll help keep you from hitting the guardrail. But at low speeds when climbing over rocks and such, it's just a likely to get you stuck.

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