Tires? Speed?

[jcsaleen]

Does anyone know any good extremely high speed/performance tires. Anything that can handle around 205 - 220 mph? That are Dot approved also.

[GreyGoose006]

i'd start looking at pirelli's website
they are known as the high performance tire brand

it truly depends on your application though.
any details?

[curtis73]

The highest DOT rated tire is "Y" which is good for 186 mph. Keep in mind that the ratings are done on a static dyno which measures tire deflection at speed, so different manufacturers all have different actual speeds at which they fly apart into little shards of death.

Non-DOT road race tires can take a little more than that, but not much. If you think about it, you're talking about speeds that are higher than NASCAR and even they blow a few during a 500-mile race. If you're just looking for street tires, non-DOT race tires will slip past 99% of the cops out there, but they are terrible street tires. They don't perform unless they're at temperature and any hint of rain they tuck tail and put you into a curb. If you need race tires that require DOT, you're not in a race class where anything more than about 120 mph is even possible.

I guess this begs the question... why? What car do you have that can beat 200 mph and where on earth will you ever see those speeds?

[bobss396]

The highest I ever bought was for my wife's Buick, they were BF Goodrich T/A radials "S" rated to 130 I believe.

Why do they have to be DOT approved? If you plan on going that fast, who cares? You are definitely into the realm of a pure racing application tire anyway.

I had some leftover Hoosier stock tires that I used on once a street car, they had a DOT rating and were treaded. They had a ton of side bite and my '65 Belair cornered like a Lotus (almost). They did wear out after 2 weeks of such abuse.

Bob

[jcsaleen]

Jw ~ I guess my friends 512 Rwhp single Fd got up to 212mph on a veryyy long highway upstate N.Y around the binghampton area. I was wondering what the hell tire's could he have used?

http://videos.streetfire.net/video/w...ca64798506.htm

Btw ~ Upstate there is no one (cows thats about it) around and the most insane roads...

I was thinking about the advan A048's which most track Fd's have. I would not be suprised if Igor has them too

[curtis73]

Its possible he used generic touring rubber for all we know. Speed rating isn't a magical number where the tire explodes He just took insane risks.

And I also don't buy the 212 mph... not with 500 rwhp in an RX7. I'd buy it at 650 rwhp, but they create way too much downforce to make 200 at those power levels. I give it 175 mph tops.

Translated, he did a gear swap and shot the footage before changing the speedo. Take a look at the trees at the end of the video; they're not moving 200 mph... 100 maybe, but that movie screams fake from the beginning to the end. Jeez I hate the bull that the bad ricers try to pull. That movie is like a big sticker; they think that by falsely making things LOOK impressive that we might mistake it for something that actually IS impressive. 500 to the wheels is no slouch, but that movie makes me want to vomit.

Have him call me when he can make 1200 hp and 2131 lb-ft to the wheels in a daily driver using transesterified grease from McDonalds. Then he can race me and we'll see who comes out on top

[2.2 Straight six]

When people run speed trials they use GPS-based speed monitoring equipment. Speedos really aren't that accurate over the ~120mph mark. and 212mph in a stock-bodies 512bhp RX-7? can't see it. i think he's pulling your leg.

Originally Posted by curtis73

Have him call me when he can make 1200 hp and 2131 lb-ft to the wheels in a daily driver using transesterified grease from McDonalds. Then he can race me and we'll see who comes out on top

I know of a Cummins over here making more than that. (nope, not joking.)

[Moppie]

Hmmmmm, 300kph in a 500hp RX7?

Yeah, I actually think its possible, as in its with the limits of the car on the right road.
Unfortunately that Video really does have a large dose of the Wank Factor.
Not saying it didn't happen, but if it did then there was more luck than driver skill involved, and had they tried to maintain it over any standing distance there is too high a chance something fatal would have gone wrong.
A crash at that sort of speed makes a really, really big mess.
(also note: he only claims its 197mph taken from some kind of data logger or after market controller).


The Current NZ Land Speed record stands at just over 300kph: http://www.motorsport.org.nz/Awards/records.htm
And Several attempts have been made to beat it: http://www.mx5club.org.nz/news/mazda...010200_300kph/

The problem is not getting enough power out of the cars, or even finding tyres that can stand up to that sort of speed, its keeping the cars stable at that sort of speed on a public road for the 1km distance needed to break the record.

While I don't doubt many US roads are better than NZ roads, do you really want to trust your life to them at these sorts of speeds? Because even a small bump will kill you.
Which would explain why as soon as he hit the end of the gauge he buttoned off, and it sounds like, started braking.

[jcsaleen]

FD's create downforce but not as much as you think. If they did create that much to detur them from 300 kph why would all these high downforce kit's be made for the FD? He has no wing or maybe the stock was on which does no create downforce or any significan number anyways. The kit he has on is a C-west with a 99 front end so no canards or anything just streamlined. I completely believe that he could hit 300 kph around 200mph very easily. Also I'm sure he has a new gear ratio in that because stock Fd's top out at 168

Originally Posted by curtis73

Have him call me when he can make 1200 hp and 2131 lb-ft to the wheels in a daily driver using transesterified grease from McDonalds. Then he can race me and we'll see who comes out on top

The most I've seen is a 45 year olds 3 rotor (20B) with a single Turbo Gt42R (Divided 1.32 ) making 1259rwhp @ 8psi. I honestly think he can go to 15lbs no problem the engine was bridge ported an 3mm seals.

I'll see if I can find the pic of the probably the most powerfull rotary made yet. Tri-turbo T51-SPL'd 20B 3mm don't know the port though.

Moppie ~ We have the fastest speeding ticket in the world. (top gear states it) 242mph in texas by a Koenigsegg CCR.

[KiwiBacon]

300km/h = 186 miles/hour

200 miles/hour = 321 km/h.

The difference may not sound like much, but power requirements rise with the cube of speed.
To get to 321km/h takes about 23% more power. If you've already got 500hp and make 300km/h, then you'll need over 600hp to get to 321km/h.

[jcsaleen]

Originally Posted by KiwiBacon

300km/h = 186 miles/hour

200 miles/hour = 321 km/h.

The difference may not sound like much, but power requirements rise with the cube of speed.
To get to 321km/h takes about 23% more power. If you've already got 500hp and make 300km/h, then you'll need over 600hp to get to 321km/h.

I've seen 400 rwhp FD's easily make it to stock max speed and with gearing hit 180 mph. That car is light as it is, not to mention seats and other things done. 500 certainly seems enough to hit 200 mph. The stock C6 is 442rwhp an it easily makes it to 190 mph and it weighs 3191.

[2.2 Straight six]

i trust he has a roll cage and all that?

[KiwiBacon]

Originally Posted by jcsaleen

I've seen 400 rwhp FD's easily make it to stock max speed and with gearing hit 180 mph. That car is light as it is, not to mention seats and other things done. 500 certainly seems enough to hit 200 mph. The stock C6 is 442rwhp an it easily makes it to 190 mph and it weighs 3191.

Weight doesn't really matter to topspeed. It's all about aerodynamics.
Having low enough drag, while also having enough downforce for the traction needed.

Unless your car has a CdA the same or lower than a C6, the comparison is pointless.

[jcsaleen]

Originally Posted by 2.2 Straight six

i trust he has a roll cage and all that?

Obviously, I don't know if you can see it in the video but even at 200 mph it's highly unlikely the rollcage will do anything to protect him.

[2.2 Straight six]

you'd be surprised. of course, if he's doing 200mph on a Jersey highway and he loses control, he's more likely to hit something.

people over here often use Bruntingthorpe Proving Ground (straight 2-mile airfield) because it's long, safe and there's nothing to hit.