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ATTS question

 
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Old 05-07-2011, 12:37 AM
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ATTS question

I just bought a 97 SH lude back in September of 2010 with 82,000 miles on it, and I've been loving it. I've been trying to learn all I can about these cars, but I have a question about the ATTS system.

I know that it transfers the torque to different wheels to lessen understeer, but the other day I was learning about rear differentials, and it sounded pretty similar: it's purpose is to allow one wheel to spin at a different speed than the other. If this is the case, why don't they just put a differential like that in the front wheels, instead of having this whole complicated system to do this?

Might be a noob question, but enlighten me.
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Old 05-07-2011, 01:12 AM
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Re: ATTS question

Some have LSD instead of ATTS
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Old 05-07-2011, 01:19 AM
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Re: ATTS question

i really dont know, i do know i love atts though it is awesome. maybe they just wanted ppl to think they were really smart when they made it so they made it complicated
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Old 05-07-2011, 01:21 AM
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Re: ATTS question

Preludes have always been a test bed for Honda engineering. Basically it is a limited slip system, it's just a computer controlled system with some sensors to determine how much slip and how much torque to apply to which wheel.
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Old 05-07-2011, 02:50 PM
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Re: ATTS question

SH's never ever came with an LSD. the type s has atts. the sir-s has an lsd
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Old 05-07-2011, 02:51 PM
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Re: ATTS question

UPS is right again! ^_^
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Old 05-07-2011, 02:54 PM
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Re: ATTS question

also, atts isn't exactly the same. differentials just shift power to he wheel with the most resistance. atts transfers power to your outer turning wheel. if you turn left, shift more power to the right wheel; and vice versa
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Old 05-07-2011, 03:44 PM
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Re: ATTS question

Also LSD is purely mechanical. ATTS is both mechanical and electrical.
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Old 05-07-2011, 05:46 PM
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Re: ATTS question

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Also LSD is purely mechanical. ATTS is both mechanical and electrical.
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Old 05-07-2011, 07:31 PM
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Re: ATTS question

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Originally Posted by Garrett565 View Post
I know that it transfers the torque to different wheels to lessen understeer, but the other day I was learning about rear differentials, and it sounded pretty similar: it's purpose is to allow one wheel to spin at a different speed than the other. If this is the case, why don't they just put a differential like that in the front wheels, instead of having this whole complicated system to do this?
You're right in that ATTS and a limited-slip differential (LSD) are both torque control devices. An open diff transmits power to the axle with the least resistance, which is why if one side's spinning freely, there's no power going to the other side. A limited slip diff serves to limit the power going to the side with least resistance, so at some point, the axles lock together, and is split between both wheels. Lock the diff at the start (as in many drag racers and some circle track cars), and power is split evenly between both wheels (at the expense of the inner wheel hopping around corners).

The downside of an LSD is that it's a passive system -- it does nothing until the low-traction side soaks up a certain amount of power before the wheels lock, creating a lag in applying power to the ground. Also, you're never going to get more than 50% of the power to either axle, so an LSD serves only to insure you're putting something to the ground. Any modification to handling is incidental. In fact, an LSD in most front-drive cars increases understeer, although it's often worth it to get power to both sides.

ATTS is different than an LSD in three ways. First, it's no good at all in split traction situations -- that is, it's not an LSD. Take traction off the inside front tire, and it'll spin merrily. Second, ATTS is an active, rather than a passive system -- all those sensors measure expected conditions at the wheels, and change the axle speeds to achieve an intended effect. Last, ATTS isn't trying to lock the axles together -- it's doing the exact opposite, in that it transmits more power to one side to drive that side faster. In a fast sweeper, for example, the outside will get more than 50% of the power, to drive that wheel faster and move the nose around.

The ideal setup would be a system that combines the functions of an LSD and ATTS -- the SH-AWD system is supposed to do that, and realistically, it probably takes AWD to achieve that.
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