Pics of my new tires and wheels

Pics of my new tires and wheels - Printable Version

+- 968Forums.com (https://968forums.com/forum)
+-- Forum: RAISING MY 968 - The Modifying, Care & Feeding (https://968forums.com/forum/raising-my-968-the-modifying-care-feeding)
+--- Forum: SHOPAHOLICS (https://968forums.com/forum/shopaholics)
+---- Forum: Tires (https://968forums.com/forum/tires)
+---- Thread: Pics of my new tires and wheels (/pics-of-my-new-tires-and-wheels.html)

Pages: 1 2 3

Pics of my new tires and wheels - rhudeboye - 07-17-2009

my 18" turbo twist new setup:
Front: 7.5JX18, offset: 50mm. Porsche PN# 993.362.134.06. Tire size: 225/40/18 Michelin Pilots
Rear: 9JX18, offset: 52mm. Porsche PN# 993.362.138.01. Tire size: 265/35/18 BF goodrich / G-Force Sport

Funny thing. After mounting the wheels and going for a spin, I was expecting a harsher ride. I thought that bumps would be much more pronounced. I thought road noise would increase and I thought that I would notice a drop in acceleration.

<b>The Results:</b>
As it turned out, the ride feels more balanced then before. This is without an alignment being done. The car corners well with the G-force tires and you really have to go nuts to get any squeal out of them. I can however make them break traction pretty easy when there cold.

As for the rough ride, this also was a pleasant surprise. I took a ride down a 3 mile stretch of wooded twisty road averaging around 80. Downshifts while entering corners felt more stable. Could this be the extra bite in the tire size or is it a characteristic of the 18" wheel? I dunno but I like it. As I crossed a patch of broken up asphalt I was able to see that the ride wasn't rough at all. With stock springs going to 35 tire wall doesnt seem to sacrifice any comfort.

The one fear that did become a reality is a loss in acceleration. I wish I had measured this before the swap. I still have my old wheels so I just may do so and hope that I can be proven wrong. Its most noticeable in 1st and 2nd gear. I never spent a lot of time in first, normally I shift around 4.5K however I run 2nd all the way up and it has all ways given me a good shove in the seat and didn't let go until the shift at 7K. The push is just not where it was anymore. It starts to feel right right around 4.2K but the kick around 2.5 is now quite gentle. Perhaps I just need an oil change and to clean the K&N. We shall see.

Another big plus is the look. [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]

Pics of my new tires and wheels - Anchorman - 07-17-2009

I've been running 18" wheels for several years now, on the street and on the track. I have not found any uncomfortable harshness on the street - and my yardstick is whether or not my wife complains (and she doesn't, at least not about the ride!). I have no sense of whether they're faster or slower - but I know I like them. Enjoy.

Pics of my new tires and wheels - SILVY968 - 07-17-2009

Looks great. I think that the twist 18" make the car.
Brian

Pics of my new tires and wheels - xrad - 07-17-2009

yep, nice. Wonder why you lost accel? The diameter should be nearly the same?.?

Pics of my new tires and wheels - flash - 07-17-2009

that's easy - weight - it's not just the net weight either, but where it is - outer diameter weight (tires) will hurt you more than inner diameter weight (hubs of the wheels)

even at the same net weight, it can result in a change - i just ran the numbers and going from a 255/40-17 weighing in at 28lbs, and a wheel at 23lbs, to a 265/35-18 weighing in at the same weight and the 18" wheel at the same weight, i got a net chassis difference of 58.43lbs increase

change that up to where it likely really is, using the real weights, and it is the same as adding a whopping 198.62lbs!!!

to put it in terms we can all understand, it's about the same as a passenger sitting there - we all know how that feels

Pics of my new tires and wheels - rhudeboye - 07-17-2009

QUOTE (flash @ Jul 17 2009, 02:52 PM) <{POST_SNAPBACK}>that's easy - weight - it's not just the net weight either, but where it is - outer diameter weight (tires) will hurt you more than inner diameter weight (hubs of the wheels)

to put it in terms we can all understand, it's about the same as a passenger sitting there - we all know how that feels

Bingo

As I mentioned in this http://www.968forums.com/index.php?showtopic=7200&hl= discussion a few months back. Centrifugal force is a BIT*H.

The passenger illustration is pretty accurate, at least judging from what I feel. If you dont feel the performance diff when someone hops in your car you wont notice the wheel difference. My friend w/ his 51 was bragging about his mods and took me for a ride to show me the results. It felt fast to me but he was disappointed. He told me to drive it without a passenger so I could feel what he felt.

I think if you don't drive your car hard you wouldn't notice as you could always give a little more gas with an extra passenger and come off the line as you always do. But at WOT any missing power is noticeable.

Pics of my new tires and wheels - rhudeboye - 07-17-2009

btw did ya notice the shine?
wash
clay
buff w/ Smooth Cut Polish
1 coat of carnuba wax
4.5 hours including beer time
not perfect but I was able to get all of those water spots and swirl marks out. Now it gives a decent reflection.

Pics of my new tires and wheels - Fox944 - 07-18-2009

Looks great, you already know i'm a fan of 993 Technology wheels. [img]style_emoticons/<#EMO_DIR#>/wub.gif[/img]

Pics of my new tires and wheels - Cloud9...68 - 07-18-2009

QUOTE (flash @ Jul 17 2009, 03:52 PM) <{POST_SNAPBACK}>that's easy - weight - it's not just the net weight either, but where it is - outer diameter weight (tires) will hurt you more than inner diameter weight (hubs of the wheels)

even at the same net weight, it can result in a change - i just ran the numbers and going from a 255/40-17 weighing in at 28lbs, and a wheel at 23lbs, to a 265/35-18 weighing in at the same weight and the 18" wheel at the same weight, i got a net chassis difference of 58.43lbs increase

change that up to where it likely really is, using the real weights, and it is the same as adding a whopping 198.62lbs!!!

to put it in terms we can all understand, it's about the same as a passenger sitting there - we all know how that feels
Is this because a high percentage of a tire and wheel's weight is concentrated at the perimeter, so going to a wheel/tire with a larger circumference pushes relatively more of the weight out to the periphery, even if the static mass of the wheel/tire combination stays the same?

I love the looks of the 18" twists that Rhudeboy installed. However, unless you feel a need to install enormous brakes, the peripheral weight penalty is a pretty high price to pay. Unfortunately, it seems that most of the better-looking wheels, particularly the newer ones, only come in 18" and larger. Ah, those prickly tradeoffs...

Pics of my new tires and wheels - flash - 07-18-2009

exactly - move that boy up to the front of the class

Pics of my new tires and wheels - jlm968 - 07-22-2009

What's the optimal wheel/tire combination, then, to get minimal centrifugal weight?

Pics of my new tires and wheels - flash - 07-22-2009

lol - believe it or not, the 993 Cup wheel (the 17" OEM wheel for the later cars) with the 255/40-17 and 225/45-17 is about as light as you get without getting into the stratosphere of expensive wheels - there are some lighter ones, but not by much

the 16s are generally even lighter, but you give up some in handling

each tire varies in weight from manufacturer to manufacturer - this is a BIG factor - you need to shop around to find the lightest one - tirerack has weights on most of them

18s just cost you effective weight, pretty much no matter which way you look at it - you really have to spend big to get down below what the stock 17" setup is - my wheel and tire combo is actually lighter than what was on the car, but still heavier in effective weight - i noticed it right away in my 0-60 times

Pics of my new tires and wheels - rhudeboye - 07-22-2009

QUOTE (flash @ Jul 22 2009, 08:15 AM) <{POST_SNAPBACK}>i noticed it right away in my 0-60 times

Yeah, I found that to be true as well. On hard acceleration I noticed it before I even hit 2000 RPM.

Shouldn't be surprised that the Cups are such a good match. Seems that Porsche did everything possible at the time to squeeze the most performance out of this car before releasing it.

Pics of my new tires and wheels - Cloud9...68 - 07-22-2009

QUOTE (flash @ Jul 22 2009, 09:15 AM) <{POST_SNAPBACK}>lol - believe it or not, the 993 Cup wheel (the 17" OEM wheel for the later cars) with the 255/40-17 and 225/45-17 is about as light as you get without getting into the stratosphere of expensive wheels - there are some lighter ones, but not by much
Interesting. I sure wish the wheel manufacturers would get over their obsession with enormous diameters, since 17" seems to really be the optimal size for light weight, reasonable braking capabilty, and reasonable sidewall stiffness. It would be nice to have a wider choice of 17" wheels.

Pics of my new tires and wheels - flash - 07-22-2009

lol - i'd settle for a better selection of tires

Pics of my new tires and wheels - Cloud9...68 - 07-22-2009

Yeah, that too. Although there still seems to be a decent selection of very good tires in 17"; a lot more than of premium wheels, it appears.

Pics of my new tires and wheels - flash - 07-22-2009

well, i guess i should have been more specific - they just are not in the sizes i want

Pics of my new tires and wheels - Ryan - 07-23-2009

I don't think it is the wheel manufacturers driving the big diameters, but the market trends. The aftermarket demand was for larger wheels as well as the show market. This is not taken lightly by auto designers trying to capture the younger market. Look at any youth aimed cars and they come with 18"s and lets through in some aluminium pedals and a sub w/500 watts from the factory.

Pics of my new tires and wheels - S_Cal968 - 07-25-2009

On a side note, I some times have to laugh when I see an suv with 20 or 22" wheels. Typically these wheels expose the under-sized brakes. I wonder if owners realizes how their wheels hurt acceleration and reduce braking ability[?]. [img]style_emoticons/<#EMO_DIR#>/ohmy.gif[/img] But hey they look cooool... [img]style_emoticons/<#EMO_DIR#>/cool.gif[/img]

Pics of my new tires and wheels - flash - 07-25-2009

yup - that's why i went with bigger rotors when i added the 22s