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wilsonny
Monza


Joined: 01 Dec 2012
Posts: 185
Location: Cumbria


PostPosted: Fri Jun 07, 2019 5:18 pm    Post subject: experience of fsd with 17 and 18 inch wheels ? Reply with quote

anyone got direct experience to compare 17 inch wheels with koni fsd and m033 to 18 inch wheels under the same conditions ? I'm currently thinking of a switch from 17 inch wheels to 18 inch but have seen a few mentions of the ride being impacted for the worse with 18s, but not sure if this is just with harsher shocks and springs on the car.

i like the way the car runs on 17, but like the look of 18...but on balance if its likely to degrade the ride, I'll stick with 17.
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Luddite
Spa-Francorchamps


Joined: 18 Dec 2018
Posts: 337
Location: Scotland


PostPosted: Fri Jun 07, 2019 7:00 pm    Post subject: Reply with quote

wilsonny, sorry I have no direct experience of the specifics that you request but until someone comes along with that which you request I am happy to share aspects of my limited experience which may provide you with a slightly wider perspective.

As I have typed elsewhere my Porsche experience of the variation in a 1" difference in wheel size all be it 15" to 16" on 911 SC models, was the difference between the SC at 15" and the SC Sport at 16". Both set-ups equated to each having the same rolling radius (overall diameter) thus maintaining speedometer accuracy and tyre to bodywork clearances. The Sport version also was fitted with different shock absorbers.

The difference was that the sport had sharper handling as the result of having less tyre sidewall flex but the downside of that was that you DEFINATELY felt the road surface more accutely as having less sidewall to absorb bumps and thumps.

Ultimately much depends upon your priorities be they looks, handling or a degree of additional comfort.

Given the above was my experience around the time the 993 introduction, as I walked towards the 993 looking at the very low profile tyres (compared to MY non-sport SC), I mentally prepared myself for a bumpy ride.... Well I sure got that wrong, as the then new suspension was DESIGNED to match the low profile tyres thus the ride and handling were greatly improved over the SC Sport cars I had experience of..

If the original Porsche suspension set-up does not match the choice of replacement tyre and wheel combo, then it seems logical that there will be a difference in the driving experience.

Of course going too large in the wheel/ tyre department can also affect body clearance too. There can be wheel/tyre issues relative to diameter, width and off-set as well as the aspect ratio of the tyres.

Using logic it does seem that increased shock transmitted to the monocoque may also create unforeseen issues in time..?

Apologies if this comes across as all too obvious.. Question
 
  
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madge
Montreal


Joined: 29 Dec 2015
Posts: 505
Location: Hampshire


PostPosted: Sat Jun 08, 2019 6:21 pm    Post subject: Reply with quote

I've got exactly this set up and switched from 17" cups to 18" hollow spokes.

I barely noticed any difference in the ride quality and so have been more than happy to stay on the 18s. I had been expecting a significant deterioration before I switched but in the end I was surprised how comfortable the car remained with the bigger wheels.

Of course, it will always come down to personal preference ultimately but I do not consider myself to be someone that would put up with too harsh a ride quality for long.

Edit: just for completeness, my tyres are Michelin Pilot Sport 4.
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wilsonny
Monza


Joined: 01 Dec 2012
Posts: 185
Location: Cumbria


PostPosted: Sun Jun 09, 2019 9:52 am    Post subject: Reply with quote

madge wrote:
I've got exactly this set up and switched from 17" cups to 18" hollow spokes.

I barely noticed any difference in the ride quality and so have been more than happy to stay on the 18s.

Edit: just for completeness, my tyres are Michelin Pilot Sport 4.


spot on... just what I needed, sounds like I'll be happy with the 18s
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pierrebear
Spa-Francorchamps


Joined: 27 Sep 2017
Posts: 288
Location: Jersey


PostPosted: Sun Jun 09, 2019 10:41 am    Post subject: Reply with quote

Hi wilsonny - not able to help sadly as my car currently having FSDs fitted on the stock 17 Cup 2s. Am planning on graduating up to 18s though as the car becomes more RS’d so would be keen to hear how you get on.

Also what 18s are you going for?
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wilsonny
Monza


Joined: 01 Dec 2012
Posts: 185
Location: Cumbria


PostPosted: Sun Jun 09, 2019 12:32 pm    Post subject: Reply with quote

pierrebear wrote:
Hi wilsonny - not able to help sadly as my car currently having FSDs fitted on the stock 17 Cup 2s. Am planning on graduating up to 18s though as the car becomes more RS’d so would be keen to hear how you get on.

Also what 18s are you going for?


I'm trying to keep mine as a compromise between comfort and a little better performance for the odd track day. one of the reasons is tyre choice....new stuff doesn't seem to be available at 17 inch.

wheel choice... not sure I should admit to it on here... there may be disapproving comments because I'm almost certainly going for non Porsche items, oz alleggerita hlt in dark grey, so will look like this...

https://images.app.goo.gl/Ghfpub43Dh2bEzgJ7
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wilsonny
Monza


Joined: 01 Dec 2012
Posts: 185
Location: Cumbria


PostPosted: Sun Jun 09, 2019 12:36 pm    Post subject: Reply with quote

Luddite wrote:
wilsonny

If the original Porsche suspension set-up does not match the choice of replacement tyre and wheel combo, then it seems logical that there will be a difference in the driving experience.

Apologies if this comes across as all too obvious.. Question


thanks... looks like from other comments that it should be ok. 18 inch was of course an option for our cars so wouldn't expect a major problem.
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