top speed
Registered User
Joined: Jan 1999
Posts: 117
From: Houston
Originally posted by zx1216
In 1994, car and driver(i think) tested the 95' z28 m6 with 3.42 gears and read a drag limited 156mph in 5th gear. it also depends if you have z rated tires or not,
In 1994, car and driver(i think) tested the 95' z28 m6 with 3.42 gears and read a drag limited 156mph in 5th gear. it also depends if you have z rated tires or not,
W rated are Ok'd up to 168 mph or 270 km/h
Y rated are OK'd up to 186 mph or 299 km/h
If you are going to do something as stupid as drive 150+mph on any public road without every imaginable type of safety equipment, the least you can do is have the right tire.
Not that I didn't peg mine out when it was still stock.
Registered User
Joined: Apr 2003
Posts: 880
From: Land O Lakes, FL
Originally posted by CamaroSS30thAnn
EDIT: is it true that a stock 2003 Mach 1 with the 305 hp can really pull a 1.7 60 foot and a 13.1x 1/4 mile time...i read a review on them and dont believe the numbers i think its bull
also this is a camaro site so im not expecting much answers
EDIT: is it true that a stock 2003 Mach 1 with the 305 hp can really pull a 1.7 60 foot and a 13.1x 1/4 mile time...i read a review on them and dont believe the numbers i think its bull
also this is a camaro site so im not expecting much answers
Registered User
Joined: May 2002
Posts: 4,579
From: Cincinnati, OH
Originally posted by bow94z
6spds are like 150-160 mph..... A4's from the factory cut off at like 110-115mph, but with a little programming the top speed can be raised... thats what i heard
6spds are like 150-160 mph..... A4's from the factory cut off at like 110-115mph, but with a little programming the top speed can be raised... thats what i heard
Registered User
Joined: Mar 2000
Posts: 1,955
From: Point Pleasant, NJ... USA
Originally posted by Markbo
Actually Z rated tires are rated only up to 149mph or 240 km/h.
W rated are Ok'd up to 168 mph or 270 km/h
Y rated are OK'd up to 186 mph or 299 km/h
If you are going to do something as stupid as drive 150+mph on any public road without every imaginable type of safety equipment, the least you can do is have the right tire.
Not that I didn't peg mine out when it was still stock.
Actually Z rated tires are rated only up to 149mph or 240 km/h.
W rated are Ok'd up to 168 mph or 270 km/h
Y rated are OK'd up to 186 mph or 299 km/h
If you are going to do something as stupid as drive 150+mph on any public road without every imaginable type of safety equipment, the least you can do is have the right tire.
Not that I didn't peg mine out when it was still stock.
Q - up to 100 mph.
S - up to 112 mph.
T - up to 118 mph.
U - up to 124 mph.
H - up to 130 pmh.
V - up to 149 mph.
W - up to 168 pmh.
Y - up to 186 mph.
Z - 149 mph. & over
Note All ratings are 'up to' except Z rated which are 149 MPH and OVER.. they are the highest speed rated tires.. and ARE the 'right' tire..
Registered User
Joined: Jan 1999
Posts: 117
From: Houston
Well I didn't copy my information directly from Discount tire's website, so I can only provide information I have from the manufacturers.
'Z' are not the highest rated tires - let me explain. Firestone specifices their Z rating says 149mph +. That does not mean 149 to infinity. That is why the W & Y ratings are there... otherwise you wouldn't need them now would you?
According to Firestone (how Ironic, huh?), the Z rating means anything Z rated is approved for 149mph + UP TO 168 mph, or where the W takes over.
However Goodyear specifically states that anything over 149mph is considered Z rated and in their system W & Y are 'sub categories' of Z - BUT just plain Z is speed rated up to the W rating of 168mph too. So in the end you are not right... Z is the highest, but not 'just' Z - W or Y have to be part of the coding.
But my purpose was not to get into a pissing match about speed ratings. It was more a tongue in cheek message about the danger of running a stock vehicle at extreme high speeds. It is incredibly dangerous.
'Z' are not the highest rated tires - let me explain. Firestone specifices their Z rating says 149mph +. That does not mean 149 to infinity. That is why the W & Y ratings are there... otherwise you wouldn't need them now would you?
According to Firestone (how Ironic, huh?), the Z rating means anything Z rated is approved for 149mph + UP TO 168 mph, or where the W takes over.
However Goodyear specifically states that anything over 149mph is considered Z rated and in their system W & Y are 'sub categories' of Z - BUT just plain Z is speed rated up to the W rating of 168mph too. So in the end you are not right... Z is the highest, but not 'just' Z - W or Y have to be part of the coding.
But my purpose was not to get into a pissing match about speed ratings. It was more a tongue in cheek message about the danger of running a stock vehicle at extreme high speeds. It is incredibly dangerous.
Registered User
Joined: Sep 2003
Posts: 707
From: Dallas
From Tirerack: http://www.tirerack.com/tires/tirete...eral/speed.jsp
It's important to note several things about all of this:
1. Tires are only tested up to their rated speed, except in the case of either Z, or Y with (). Even in this case, however, the manufacturer does not have to release exactly how far beyond the rated speed they tested a tire.
2. Many of the tire models available today were designed and tested before the W/Y ratings came into effect, thus they have a Z rating. The tire companies of course aren't going to spend the money to recertify these models if they don't have to.
3. As the quote states, until very recently if a tire manufacturer rates a tire for faster than 186MPH (Y), then they would have had to still use the Z rating.
Speed ratings are based on laboratory tests where the tire is pressed against a large diameter metal drum to reflect its appropriate load, and run at ever increasing speeds (in 6.2 mph steps in 10 minute increments) until the tire's required speed has been met.
It is important to note that speed ratings only apply to tires that have not been damaged, altered, under-inflated or overloaded. Additionally, most tire manufacturers maintain that a tire that has been cut or punctured no longer retains the tire manufacturer's original speed rating, even after being repaired because the tire manufacturer can't control the quality of the repair.
Over the years, tire speed rating symbols have been marked on tires in any of three ways shown in the following examples:
225/50SR16 225/50SR16 89S or 225/50R16 89S
Each of these was an acceptable method of identifying speed ratings.
Early tires had their speed rating symbol shown "within" the tire size, such as 225/50SR16. Tires using this type of branding were not to have been produced after 1991.
225/50SR16 112 mph, 180 km/h
225/50HR16 130, 210 km/h
225/50VR16 in excess of 130 mph, 210 km/h
Beginning in 1991, the speed symbol denoting a fixed maximum speed capability of new tires must be shown only in the speed rating portion of the tire's service description, such as 225/50R16 89S. The most common tire speed rating symbols, maximum speeds and typical applications are shown below:
N 87 mph 140 km/h Temporary Spare Tires
P 93 mph 150 km/h
Q 99 mph 160 km/h Studless & Studdable Winter Tires
R 106 mph 170 km/h H.D. Light Truck Tires
S 112 mph 180 km/h Family Sedans & Vans
T 118 mph 190 km/h Family Sedans & Vans
U 124 mph 200 km/h
H 130 mph 210 km/h Sport Sedans & Coupes
V 149 mph 240 km/h Sport Sedans, Coupes & Sports Cars
When Z-speed rated tires were first introduced, they were thought to reflect the highest tire speed rating that would ever be required, in excess of 240 km/h or 149 mph. While Z-speed rated tires are capable of speeds in excess of 149 mph, how far above 149 mph was not identified. That ultimately caused the automotive industry to add W- and Y-speed ratings to identify the tires that meet the needs of new vehicles that have extremely high top-speed capabilities.
W 168 mph 270 km/h Exotic Sports Cars
Y 186 mph 300 km/h Exotic Sports Cars
While a Z-speed rating still often appears in the tire size designation of these tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph, 240 km/h; the W in the service description indicates the tire's 168 mph, 270 km/h maximum speed.
225/50ZR16 in excess of 149 mph, 240 km/h
205/45ZR17 88W 168 mph, 270 km/h
285/35ZR19 99Y 186 mph, 300 km/h
Most recently, when the Y-speed rating indicated in a service description is enclosed in parenthesis, such as 285/35ZR19 (99Y), the top speed of the tire has been tested in excess of 186 mph, 300 km/h indicated by the service description as shown below:
285/35ZR19 99Y 186 mph, 300 km/h
285/35ZR19 (99Y) in excess of 186 mph, 300 km/h
As vehicles have increased their top speeds into Autobahn-only ranges, the tire speed ratings have evolved to better identify the tires capability, allowing drivers to match the speed of their tires with the top speed of their vehicle.
It is important to note that speed ratings only apply to tires that have not been damaged, altered, under-inflated or overloaded. Additionally, most tire manufacturers maintain that a tire that has been cut or punctured no longer retains the tire manufacturer's original speed rating, even after being repaired because the tire manufacturer can't control the quality of the repair.
Over the years, tire speed rating symbols have been marked on tires in any of three ways shown in the following examples:
225/50SR16 225/50SR16 89S or 225/50R16 89S
Each of these was an acceptable method of identifying speed ratings.
Early tires had their speed rating symbol shown "within" the tire size, such as 225/50SR16. Tires using this type of branding were not to have been produced after 1991.
225/50SR16 112 mph, 180 km/h
225/50HR16 130, 210 km/h
225/50VR16 in excess of 130 mph, 210 km/h
Beginning in 1991, the speed symbol denoting a fixed maximum speed capability of new tires must be shown only in the speed rating portion of the tire's service description, such as 225/50R16 89S. The most common tire speed rating symbols, maximum speeds and typical applications are shown below:
N 87 mph 140 km/h Temporary Spare Tires
P 93 mph 150 km/h
Q 99 mph 160 km/h Studless & Studdable Winter Tires
R 106 mph 170 km/h H.D. Light Truck Tires
S 112 mph 180 km/h Family Sedans & Vans
T 118 mph 190 km/h Family Sedans & Vans
U 124 mph 200 km/h
H 130 mph 210 km/h Sport Sedans & Coupes
V 149 mph 240 km/h Sport Sedans, Coupes & Sports Cars
When Z-speed rated tires were first introduced, they were thought to reflect the highest tire speed rating that would ever be required, in excess of 240 km/h or 149 mph. While Z-speed rated tires are capable of speeds in excess of 149 mph, how far above 149 mph was not identified. That ultimately caused the automotive industry to add W- and Y-speed ratings to identify the tires that meet the needs of new vehicles that have extremely high top-speed capabilities.
W 168 mph 270 km/h Exotic Sports Cars
Y 186 mph 300 km/h Exotic Sports Cars
While a Z-speed rating still often appears in the tire size designation of these tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph, 240 km/h; the W in the service description indicates the tire's 168 mph, 270 km/h maximum speed.
225/50ZR16 in excess of 149 mph, 240 km/h
205/45ZR17 88W 168 mph, 270 km/h
285/35ZR19 99Y 186 mph, 300 km/h
Most recently, when the Y-speed rating indicated in a service description is enclosed in parenthesis, such as 285/35ZR19 (99Y), the top speed of the tire has been tested in excess of 186 mph, 300 km/h indicated by the service description as shown below:
285/35ZR19 99Y 186 mph, 300 km/h
285/35ZR19 (99Y) in excess of 186 mph, 300 km/h
As vehicles have increased their top speeds into Autobahn-only ranges, the tire speed ratings have evolved to better identify the tires capability, allowing drivers to match the speed of their tires with the top speed of their vehicle.
1. Tires are only tested up to their rated speed, except in the case of either Z, or Y with (). Even in this case, however, the manufacturer does not have to release exactly how far beyond the rated speed they tested a tire.
2. Many of the tire models available today were designed and tested before the W/Y ratings came into effect, thus they have a Z rating. The tire companies of course aren't going to spend the money to recertify these models if they don't have to.
3. As the quote states, until very recently if a tire manufacturer rates a tire for faster than 186MPH (Y), then they would have had to still use the Z rating.
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