SL55/63/65/R230 AMG: TOYO quality?!? Quits atT 209 m/h...
Thread Starter
Senior Member
Joined: Jan 2007
Posts: 444
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From: Sweden
2008 MB CL600. 2020 MB E300 de. 1987 BMW M535i.
TOYO quality?!? Quits at 209 m/h (or 336 km/h)...
In the dyno yesterday, one of my Toyo Proxes T1R (315/25-20) quit, and took a good piece of my rear bumper with him..!
How old was it, you say..? I say, DOT1408. And 60 miles!
And that's supposed to be a "Y labeled" tire..!
WHAT A JOKE!
How old was it, you say..? I say, DOT1408. And 60 miles!
And that's supposed to be a "Y labeled" tire..!
WHAT A JOKE!
Last edited by maxabo; Oct 16, 2008 at 08:01 AM.
MBWorld Fanatic!
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you should've spun to 400km... see if your driveshaft stayed in place...
no tire can spin at those speeds without air cooling and stay in one piece. i am surprised that they allowed you to go that fast on the dyno...
alex
few cars
no tire can spin at those speeds without air cooling and stay in one piece. i am surprised that they allowed you to go that fast on the dyno...
alex
few cars
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From: South Carolina
2005 E55 ///AMG
Was wondering that myself....I did not remember seeing anyone dyno their car to top speed.
Thread Starter
Senior Member
Joined: Jan 2007
Posts: 444
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From: Sweden
2008 MB CL600. 2020 MB E300 de. 1987 BMW M535i.
For your information, I can tell you that your dynos are different from ours!
You have two small rollers, that the wheels rest on in between, right..?
1. The rollers deform the tires, because of the smaller diameter (creates heat).
2. The weight distribution between two rollers, creates less traction, so not seldom, you also need to put some weight on the back of the car to weigh it down (creates heat).
3. On top of that, the smaller rollers themselves create more heat, because of their small diameter.
So that you guys need to put some water on to there, or whatever to cool them down, I fully understand..!
Our dynos on the other hand, only have one BIG roller, that the car is strapped "against", so to speak.
1. That creates natural weight on to there.
2. Since the diameter is so big on the roller, the tire keeps its normal form.
3. Because of the bigger diameter, cooler roller itself.
Everyone can surely understand, why there is HUUGE different between the two dynos!
And, even if ALL of the above is inaccurate, then listen to this;
Last march we dynoed my car with WINTER TIRES (255's) on. Not Toyo, but Nokian.
We couldn't get a reading because of the bad traction, of course.
BUT, on those tires (with a 210 km/h or 130 m/h LIMIT) we went JUST AS FAST..! Several times!
And that, without having the winter tires breaking apart!!!
While the TOYOS lasted 1-2 seconds up there..!!!!
And they're suppose to have a "Y-limit" label..?!?!
Hows that for TOYO-quality..?!
You have two small rollers, that the wheels rest on in between, right..?
1. The rollers deform the tires, because of the smaller diameter (creates heat).
2. The weight distribution between two rollers, creates less traction, so not seldom, you also need to put some weight on the back of the car to weigh it down (creates heat).
3. On top of that, the smaller rollers themselves create more heat, because of their small diameter.
So that you guys need to put some water on to there, or whatever to cool them down, I fully understand..!
Our dynos on the other hand, only have one BIG roller, that the car is strapped "against", so to speak.
1. That creates natural weight on to there.
2. Since the diameter is so big on the roller, the tire keeps its normal form.
3. Because of the bigger diameter, cooler roller itself.
Everyone can surely understand, why there is HUUGE different between the two dynos!
And, even if ALL of the above is inaccurate, then listen to this;
Last march we dynoed my car with WINTER TIRES (255's) on. Not Toyo, but Nokian.
We couldn't get a reading because of the bad traction, of course.
BUT, on those tires (with a 210 km/h or 130 m/h LIMIT) we went JUST AS FAST..! Several times!
And that, without having the winter tires breaking apart!!!
While the TOYOS lasted 1-2 seconds up there..!!!!
And they're suppose to have a "Y-limit" label..?!?!
Hows that for TOYO-quality..?!
Last edited by maxabo; Oct 16, 2008 at 08:08 AM.
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From: Malaysia
2001 Kleemann CLK 230K, 2006 CLS 350, GTR R35
maybe the inner wall is damaged beforehand and gave up during the high speed run? thats some thin rubber you're running there, a small scratch goes a long way here. 
Thread Starter
Senior Member
Joined: Jan 2007
Posts: 444
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From: Sweden
2008 MB CL600. 2020 MB E300 de. 1987 BMW M535i.
At least not here. Here's Y the fastest label.
Here are the different ratings:
Speeds in KM/H
H 210
V 240
W 270
Y 300
Z over 240 (very strange rating, I must say, but it's an old one..!)
Y means 300 (or 186 m/h), yes!
But for a tire to be called Y, means rigorous tests and BIG marginals!
And that means 300 for a looong time too.
So a "Y tire" can EASILY take 336 km/h as well...
And if you don't believe that there are BIG MARGINALS, then try to explain how the winter tire with rating H took the same beating without problems..!
On top of that, 336 at the clock don't mean 336 real speed, you know!
Probably more like 320, since there's marginals even there...
Last edited by maxabo; Oct 16, 2008 at 03:25 PM.
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MBWorld Fanatic!
Joined: Dec 2005
Posts: 4,057
Likes: 341
From: NJ
2009 SL63 AMG
EVOSport took a Black Series up to 200 mph on the dyno without any issues. Sounds like a defective tire. If a winter tire rated at far lower speed could handle multiple tests without a hiccup, then it makes little sense that Y-Rated performance tire ruptured. Has to be a defective product, as Toyo makes a decent product.
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