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Old 04-26-2004, 07:21 PM
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What is Passive Rear Steering?

After reading Chike's thread about his new SVX and explaining the windows, "passive rear steering," and whatnot to family, I decided that I don't know what passive rear steering is. I searched for it here, and didn't find much (so please don't flame me).

What is passive rear steering? How is different from normal steering? How does it work? Inquiring minds want to know.
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Old 04-26-2004, 07:35 PM
Ron Mummert Ron Mummert is offline
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Wink Re: What is Passive Rear Steering?

What is passive rear steering? How is different from normal steering? How does it work? Inquiring minds want to know. [/B][/QUOTE]


Mr. aredubjay is our resident rear wheel steering guru, & I'm sure he can be persuaded to dust off the tomes of accumulated information buried somewhere under Funk & Wagnalls' porch.

Ron (now opening can o' worms).
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Old 04-26-2004, 07:41 PM
oab_au oab_au is offline
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Re: What is Passive Rear Steering?

Quote:
Originally posted by sidewinder
After reading Chike's thread about his new SVX and explaining the windows, "passive rear steering," and whatnot to family, I decided that I don't know what passive rear steering is. I searched for it here, and didn't find much (so please don't flame me).

What is passive rear steering? How is different from normal steering? How does it work? Inquiring minds want to know.
Before there is a revival of the Randy Eddycat row.

The passive rear steer is caused be the trailing link on the rear suspension. As the wheel moves up and down, it is pulled forward in an arc around this trailing link. The effect is as the wheel moves up it also is pulled forward, to point in, or toes in. This causes the car to oversteer slightly.

Harvey.
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Last edited by oab_au; 04-26-2004 at 07:43 PM.
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Old 04-26-2004, 08:02 PM
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This explains it: SVX AWD System

Look at the bottom under rear suspension. All SVX's will have this feature as the suspension was never updated by Subaru.

-Chike
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Last edited by Chiketkd; 04-26-2004 at 08:04 PM.
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Old 04-26-2004, 08:05 PM
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Passive rear-wheel steering is a marketing term coined by Subaru for what the SVX's rear suspension does. But I'm almost certain that it works the opposite compared to how Harvey explained it. As the rear suspension is loaded up, for instance during a turn, the outside rear wheel (moving up) toes out and the inside wheel (moving down) toes in.

The reason it does this is that the two parallel links are different in lengths. So as the suspension moves up and down the hub is turned as if it was being 'steered.'

I don't really consider this steering, and it's not the first suspension scheme to do what it does. But it's still cool. Of course it means that when the rear suspension is loaded evenly, like during acceleration or a big bump, both wheels toe out.

I put a picture of the rear suspension in my locker:

http://www.subaru-svx.net/photos/fil...kets/17218.jpg

Edit: Well, I read the Guide's section on suspension and it seems that I had it backwards. During cornering, the Guide says that the outer wheel toes in and the inner wheel toes out. The Guide claims that this makes the car more predictable. In this case, I think 'predictable' is just another word for 'understeer.'
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Last edited by Mr. Pockets; 04-26-2004 at 08:14 PM.
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