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Thread: Tires for Boost

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Posts: 161-170 of 176
2009-02-24 06:24:17
#161
Originally Posted by Vadim
Oh snap I would buy two sets at $40 a piece!!!!

Do you have any more details on them? How long did they last, how good were they in the rain


these were Kumho 716 ecsta hp4 treadware 360 traction A P195\60615 87H. They were the best all season tire I ever bought. I still use them on my car today. I've had them since I first bought my b14 back in 04. Milage I don't know. These tire were so good in rain and snow. I don't believe kumho makes them anymore.
2009-02-24 15:35:46
#162
Well I just bought 4 set of Ziex 912's at 195/60/15 at $248 shipped with 4 valve stems.
2009-02-24 15:53:55
#163
Originally Posted by Coheed
Really? You serious?
Yes I'm serious.

Originally Posted by Coheed
What I really mean, is a wider tire doesn't necessarily mean more grip.
Sure. No problem there. I agree.

Originally Posted by Coheed
If you look into the total friction you will notice that the total resistance to movement is based on pressure and surface area.
Yah, in physics 101. If we chug along to physics 102 or what ever we'll find that there is a whole lot more going on and it doesn't fit nicely into the watered down model given to college students.

Originally Posted by Coheed
So as the total surface area goes up, the pressure goes down, and the total friction remains the same.
You're just stuck in 1st semester physics, that's all. No big deal. There's more to learn.

Originally Posted by Coheed
The friction between the tire and the ground is nearly the same whether the tire is wide or narrow.
This is where you're making your error. This is not true. Given the same tire compound, inflation pressure, vehicle weight, wheel diameter, etc. the coefficient of friction (with respect to horizontal and lateral motion) will rise markedly as the width of the tire increases.

Originally Posted by Coheed
The purpose of the greater contact area is to reduce heating and wear. You will get better traction when using wider tires but it will depend mostly on the compound of the tire and the temp it is operated. NOT the surface area.
There are many, many things at play relating to this topic including all of the factors you mentioned. Tire width is also on the list though.
The confusion comes when people try to apply the simple Newtonian friction model to tires. It doesn't hold true in practice.
2009-02-24 16:04:54
#164
Originally Posted by Vadim
Well I just bought 4 set of Ziex 912's at 195/60/15 at $248 shipped with 4 valve stems.


Were did you buy them?
2009-02-24 17:47:32
#165
Originally Posted by soulsultan
Were did you buy them?


DiscountTiredirect.com hehe
2009-02-24 18:47:50
#166
Very well said BenFenner.
Now....
WTF. Why are people running skinny tires on turbo cars? Given the same brand and model of tire the wider one will have more grip. Be it on the drag strip, street or track. Simple as that.

My car isnt even on boost and I auto x my car with 225/45/15 tires. I use 195/50/15 Toyo Proxes 4 for daily driving and thats just to help my MPG and the way I drive the extra 1 or 2 MPG is not worth it, Im going back to 205's or 215's.

If youre going to cheap out on the tires and all you wanted was to make your car into a tire smoking machine I have news for you..... EBRAKE . Ive seen so many builds "cheap out" on tires on this forum its not even funny.
2009-02-25 04:26:50
#167
Originally Posted by BenFenner
Yes I'm serious.

Sure. No problem there. I agree.

Yah, in physics 101. If we chug along to physics 102 or what ever we'll find that there is a whole lot more going on and it doesn't fit nicely into the watered down model given to college students.

You're just stuck in 1st semester physics, that's all. No big deal. There's more to learn.

This is where you're making your error. This is not true. Given the same tire compound, inflation pressure, vehicle weight, wheel diameter, etc. the coefficient of friction (with respect to horizontal and lateral motion) will rise markedly as the width of the tire increases.

There are many, many things at play relating to this topic including all of the factors you mentioned. Tire width is also on the list though.
The confusion comes when people try to apply the simple Newtonian friction model to tires. It doesn't hold true in practice.



You are right, the simple physics I laid forth are not what really happens in the real world. Though friction remains the same without the objects moving, things get a lot more complicated as soon as they do. Friction is a very complicated subject in physics. What I was merely trying to do is get people to think more about HOW a wider tire will give you more grip. This will prevent people from going out and getting a wider tire that don't know what they are doing because someone online told them "wider is better for performance".

A wider tire can provide you with more grip, but for straight line there are alot of benefits of going larger on diameter, rather than wider. Both give you a larger contact patch. Until we get a tire with a compound with a constant friction coefficient over a large temp range, with little tread deflection, having a larger contact patch will increase traction.

I guess I went too far trying to get people to use their brain lol.
2009-02-27 02:13:52
#168
Tires have arrived . Will post impressions tomorrow hehe.


2009-02-28 06:07:46
#169
Just put some Toyo T1R's 215/45/15 on today. Haven't driven on them yet, but the tire size is closer to the diameter of the stock size, only .3% to fast compared to 205/50 which is 1.3% to slow.
2011-06-24 04:54:56
#170
Originally Posted by BenFenner
Compare prices from these (don't forget to factor in shipping) and find yourself a local shop that you can trust to mount/balance (I like to ask them if they have any gripes with doing lightweight aluminum racing wheels). Once you find that shop, see what they'll charge and go with the cheapest option. I've ordered from all of these companies and they are all decent.

www.tirerack.com
www.discounttiredirect.com
www.1010tires.com
www.vulcantire.com
www.edgeracing.com (No longer in business)

I buy a lot of tires. =D

Edit: I hear this place is good too: www.tires-easy.com


Here's another Discount Tires, Wheels & ATV | Treadepot.com
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