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4WS feel/issue?

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Old 12-14-2018, 12:43 PM
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2018 GTR and 2018 E63 Wagon
4WS feel/issue?

When I'm moving my GTR around outside my garage and have the steering wheel locked and reversing, I get a weird feeling/bump, like the tires are rubbing. I can't tell if it's coming from the front or rear.
Is this just the 4WS doing weird stuff? Does anyone else know what I'm talking about?

Thanks
Old 12-14-2018, 01:14 PM
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Originally Posted by BenzGTR
When I'm moving my GTR around outside my garage and have the steering wheel locked and reversing, I get a weird feeling/bump, like the tires are rubbing. I can't tell if it's coming from the front or rear.
Is this just the 4WS doing weird stuff? Does anyone else know what I'm talking about?

Thanks

FWIW: It’s the Cup Sport tires. They don’t like the front end alignment and turning specs especially when they are cold and turning hard. I usually turn them while moving until I start to feel the scuffing and then ease off until it stops.

Regards



Last edited by JSwan724; 12-14-2018 at 01:23 PM.
Old 12-14-2018, 03:07 PM
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Originally Posted by JSwan724



FWIW: It’s the Cup Sport tires. They don’t like the front end alignment and turning specs especially when they are cold and turning hard. I usually turn them while moving until I start to feel the scuffing and then ease off until it stops.

Regards


Ok, yeah pheeew. I just talked to someone else that has a GTC and he said it's normal, his does the same thing. Thanks!
Old 12-14-2018, 03:43 PM
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It’s from the front end and is called the Ackerman Effect and is normal on cars with wide, high performance tyres running certain alignment geometries. It’s more pronounced during cold weather, especially <50dF, when our tyres are more like hockey pucks, although when making very tight turns at very low speeds you can also feel it when it’s pretty warm out.

Bish
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Old 12-14-2018, 04:12 PM
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Originally Posted by thebishman
It’s from the front end and is called the Ackerman Effect and is normal on cars with wide, high performance tyres running certain alignment geometries. It’s more pronounced during cold weather, especially <50dF, when our tyres are more like hockey pucks, although when making very tight turns at very low speeds you can also feel it when it’s pretty warm out.

Bish
Thanks brother! First thought that came to my mind was I bought a wrecked car and frame was not straight! LOL.
This 4WS is going to take some getting used too as well, for me it feels freaky. Hopefully while on track I won't notice it so much.
Old 12-14-2018, 07:26 PM
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Originally Posted by BenzGTR
Thanks brother! First thought that came to my mind was I bought a wrecked car and frame was not straight! LOL.
This 4WS is going to take some getting used too as well, for me it feels freaky. Hopefully while on track I won't notice it so much.
You know, the RWS on the car took me about a week to get used to. It really freaked me out for the first few days tbh! lol. Now I love how it feels at low speeds. I do not notice any ill effects on a road course; the car is so easy to place where you want it to be. You’ll love it.

Bish
Old 12-17-2018, 10:29 AM
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That's good to hear, as I was worried I'd be too conscious of it on the track
Old 12-17-2018, 03:31 PM
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fun ones.
The very best drivers I've spoken to haven't been a fan of RWS on the GTR or GT3 (its the same system) but anyone below professional level seems quite happy.

Sometimes it's quite noticeable but you soon get used to it.

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