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Discussion Starter #1 (Edited)
I can't get any traction and it is really pissing me off. Here is my story. I had cheap kuhmo supra's 265/35/18 in the rear, which was fine for BPU, but then I went single (stock fuel). I upgraded to 285/30/18 Yokohomo's in the rear (on a 18x10" rim). About an hour ago I put my car in second and right when the turbo came online at 4,000rpm I found the rear of my car fishtailing in the other lane.
Anyways.....my question is....This is the first time that I have boosted in cold weather. (well......cold for florida) A cold front came in and it is about 40 degrees out. This is my first winter with a car that has over 150 horsepower. Am I not gettting traction because of the cold weather? Or do the Yokohomo's just suck?
Also, I wanted to get 285/35/18 but the guy at the tire shop said that they would rub with my eibach drop. Do you think there is really a big traction difference between 285/30 and 285/35???
Thanks ahead of time. ;)
 

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On the rare occasion that my car has been in ohio winter.... On totally dry roads, I can spin them at 60mph. Now this is weather in the low 30's. So the combo super dense air charge and cold tires are a big factor. With no extra boost, I can hit 17 psi on a cold day.
 

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new tires and cold tire make for a bad set up and no grip !

best to mabe break in the tires and make sure there warm before you open her up!
 

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I hear that BFGoodrich K/Ds are great dry tires and decent in the wet. I am going to get them next time. You should be able to get 285/30-18s to fit. I would rather have 35 series because the higher sidewall would help launching but they would probably rub after lowering. If you are serious about bigger tires get you fenders rolled.

And as long as your tires are cold, they won't grip. Warm them up before playing around. Even at BPU I can get a fair amount of wheelspin in 3rd with 275s on a cold day
 

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you are making more power in the cool air and your cold tires and road are offering less traction that hot ones. That's the combination.
Mine are doing the same (and I'm not BPU yet, and I'm auto).
 
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Good i hope you wreck the car and learn to drive it more often in the winter.
boostedsupratt said:
I can't get any traction and it is really pissing me off. Here is my story. I had cheap kuhmo supra's 265/35/18 in the rear, which was fine for BPU, but then I went single (stock fuel). I upgraded to 285/30/18 Yokohomo's in the rear (on a 18x10" rim). About an hour ago I put my car in second and right when the turbo came online at 4,000rpm I found the rear of my car fishtailing in the other lane.
Anyways.....my question is....This is the first time that I have boosted in cold weather. (well......cold for florida) A cold front came in and it is about 40 degrees out. This is my first winter with a car that has over 150 horsepower. Am I not gettting traction because of the cold weather? Or do the Yokohomo's just suck?
Also, I wanted to get 285/35/18 but the guy at the tire shop said that they would rub with my eibach drop. Do you think there is really a big traction difference between 285/30 and 285/35???
Thanks ahead of time. ;)
 

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You will not see a noticable traction difference between 285/30 and 285/35 (the car will probably feel a little less responsive with the 285/35). Anything BPU+ or above is going to see very little traction in 2nd gear on street tires when the weather is cold. Unless you go with a dragradial you will just need to wait until it warms up.

Later, Steve
 

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When the roads are warm and dry here in northern Florida my 285/18 Pilot Sports will put down about 575 RWHP in 2nd gear without spinning and 640 or so in 3rd. When the roads are cold, power has to be dialed back by 75 RWHP or maybe even more in order to get traction. If I let the inflation pressure drop much below 35 PSI, I can tell that traction suffers. (This is on a 10" wide wheel.) If you're having traction issues at substantially lower power levels, part of it is probably the cold roads and part is probably your tires.

In response to another post in this thread, IME, tires grip better when they are new. Some tires REALLY lose their grip as they wear, but some of the newer compounds are designed to combat the loss of traction as the tire wears and ages.

Steve
 

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The problem is cold roads and cold tires. Wait untill it warms up before you turn it up. Winter sucks.... for driving
 

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Tell the idiot at your tire shop that the sidewall aspect ratio has nothing to do with tire rub ( unless your running some crazy 55 or 65 series tires where the sidewalls actually have enough flex to bulge out under the weight of the car), it's the width of the tire that is important, the 285 number. All the 30 or 35 tells you is the ratio of sidewall height to width.
 

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A 285/35 is taller than a 285/30 and a 285/40 is taller and slightly more narrow than either of them. You would probably have some trouble fitting a 285/40 on a Eibach Pro Kit Supra, although a 285/30 easily fits. A tire that is too tall is definitely a problem.
 
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