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Sutton
Spa-Francorchamps


Joined: 04 Mar 2009
Posts: 303
Location: Surrey


PostPosted: Tue Feb 19, 2019 1:06 pm    Post subject: RS wheel carriers - effect on steering response Reply with quote

I've just picked up the car after having had RS wheel carriers fitted.

I can't yet comment on bump steer as I haven’t taken it on track yet. However, the steering does feel quicker than before which I wasn't expecting. Has anyone else noticed that?
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Trantorman
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Joined: 04 Aug 2008
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PostPosted: Tue Feb 19, 2019 1:29 pm    Post subject: Reply with quote

Yes that would be what you would expect, all do do with the height the steering arms sit at relative to the hub.

You will notice a positive benefit in all situations with them, which at least helps get over the shock of the parts costs..
 
  
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Sutton
Spa-Francorchamps


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Posts: 303
Location: Surrey


PostPosted: Tue Feb 19, 2019 2:05 pm    Post subject: Reply with quote

Thanks Trantorman.

The steering feels better as it's more responsive but not twitchy. Also unexpected was a slight reduction in steering weight.

It wasn't cheap but the difference is worth it to me.
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Cameltoe & Heel
Barcelona


Joined: 26 Jan 2009
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PostPosted: Tue Feb 19, 2019 2:20 pm    Post subject: Reply with quote

Which up rights did you go for?,

Trev
 
  
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Sutton
Spa-Francorchamps


Joined: 04 Mar 2009
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PostPosted: Tue Feb 19, 2019 2:29 pm    Post subject: Reply with quote

I went with OEM Porsche carriers.

I'm aware of the BBi and 9M ones. I understand the BBi ones have altered the front geometry which is useful if you're running super low ride heights. I don't know much about the 9M ones because they became available just as the OEM ones were reproduced so I didn't follow up on them.
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Endoman
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Joined: 11 Apr 2011
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PostPosted: Tue Feb 19, 2019 6:26 pm    Post subject: Reply with quote

I had a bit of a disagreement with a Rennlister about this.
Yes the steering is quicker because the effective length of the steering arm is shorter. ref:- the horizontal lines, the intersection with the yellow line is the position of the ball joint in the track rod end.
Colin Belton told me it would be and it is. Odd at first but I grew to love it.
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Sutton
Spa-Francorchamps


Joined: 04 Mar 2009
Posts: 303
Location: Surrey


PostPosted: Tue Feb 19, 2019 8:49 pm    Post subject: Reply with quote

Endoman,

That's a really useful diagram. I saw the various threads on Rennlist (Jackal had the same discussion) but didn’t follow which part lengths were involved. It's clear as day now.

The main issue I wanted to address was bumpsteer. There’s a nasty bump on the Millbrook bowl which had the car squirming so hopefully that will be significantly reduced. The car already feels less flighty on road but I'm not pushing it too hard there.

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Cameltoe & Heel
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PostPosted: Wed Feb 20, 2019 11:10 am    Post subject: Reply with quote

I didn't think they were still available?, hence the reason 9M commissioned their own?, what rough cost?,

Thanks
Trev
 
  
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Sutton
Spa-Francorchamps


Joined: 04 Mar 2009
Posts: 303
Location: Surrey


PostPosted: Wed Feb 20, 2019 11:45 am    Post subject: Reply with quote

Hi Trev

They'd been on backorder for a couple of years but Porsche produced a batch that was released last October. From memory, the carriers, wheel bearings and tie rods were £900. But there's other stuff (brake backing plates, ABS sensors - expensive), labour, geo.


The steering is a lot more quiet - no noise which I originally thought was feedback, but was actually bumpsteer. The front grips better too. The car is currently at RS+10, so isn't particularly low.

I also need to get used to the quicker turn in.

I will be taking it back to Center Gravity for as close to RS spec geo as possible (apart from camber) and corner weighting again.
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