Rear axle steering. The future?
Rear axle steering. The future?
(OP)
Hi :) I am new in the forum, I really enjoy reading so much knowledge engaged to all the topics in here.
I really admired the handling of the Porsche 918 Spyder, it kind of show us that the rear axle steering really works, but since I saw that technology in the new 911 Turbo S, I stared wondering if that technology will be in most cars in the future, what are the disadvantages of this system from the driving experience and from the lifetime of the components (tires, axle steering system, etc)? do we really need this technology in our everyday driving? since ever, most cars just come out of the factory understeering for security reasons, will this technology end up that by correcting any possible understeering or oversteering?
thanks.
I really admired the handling of the Porsche 918 Spyder, it kind of show us that the rear axle steering really works, but since I saw that technology in the new 911 Turbo S, I stared wondering if that technology will be in most cars in the future, what are the disadvantages of this system from the driving experience and from the lifetime of the components (tires, axle steering system, etc)? do we really need this technology in our everyday driving? since ever, most cars just come out of the factory understeering for security reasons, will this technology end up that by correcting any possible understeering or oversteering?
thanks.





RE: Rear axle steering. The future?
It's expensive, and that reason alone means it won't be in "most cars".
Given that "most cars" intended to be driven by "most people" don't have such a system and work well enough without it means you don't "need" it. The two cars that you mention are hardly indicative of "most cars". The 911 in particular needs help with stability due to the rear engine. "Most cars" don't have that situation.
Supplementary rear wheel steering systems have been tried long ago in more mass-market applications, and never caught on. Honda tried it in the Prelude in the 1990s. GM tried it in pickup trucks ("Quadrasteer") some years ago, and that's an appplication that one would think could really benefit (parking!) but people didn't buy it, so it ain't around any more.
RE: Rear axle steering. The future?
Cheers
Greg Locock
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RE: Rear axle steering. The future?
RE: Rear axle steering. The future?
http://www.caranddriver.com/reviews/2015-porsche-9...
RE: Rear axle steering. The future?
All this is easily verified by anyone with a car, test equipment and a place to do the ISO test manuevers. Of course, a proper simulation will tell you the same thing. The key element is that the rear steering is an input control parameter and NOT driven (forced) by lateral acceleration, as are all the other understeering/oversteering effects recognized in the vehicle's suspension and steering recipe.
Future vehicles with electrical overhead are likely to be shunning rear steer for all the previously mentioned reasons unless its mechanically architechted. Range anxiety.