Top Speed? - Page 2 - MBWorld.org Forums

02-14-2006, 07:27 PM

#26

vrus

Banned

Join Date: May 2004

Location: Richmond Hill, Ontario

Posts: 3,797

Likes: 0

Received 2 Likes on 2 Posts

2003 E55 AMG

After your car reaches terminal velocity (120mph) horsepower starts to matter more and more. There is a formula to calculate how much horespower is needed to attain a certain speed. While I dont remember the exact formula, it is based on Coefficient of drag (cd), frontal area (sq. ft) and vehicle weight.

Here is an example of a good calculator I found on the net:
http://www.rbracing-rsr.com/aerohpcalc.html

Quote:

Originally Posted by D-5

Vrus, I'm thinking of gettting K2 or equalivant upgrades. I know top speed is mostly related to gear ratio, and by upgrading to K2, the time takes to reach speed like 320km will shorten, but you do think in anyway it will increase some top speed? Is 340km possible?

Last edited by vrus; 02-14-2006 at 10:02 PM.

Reply Like

02-14-2006, 09:50 PM

#27

AsianML

Out Of Control!!

Join Date: Sep 2005

Location: West Michigan

Posts: 18,414

Likes: 0

Received 5 Likes on 5 Posts

2007 E63

Quote:

Originally Posted by can drive 55

The name actually means the car, not necessarily the velocity.

I know that. It was a really bad joke.

Reply Like

02-14-2006, 10:01 PM

#28

Can Drive 55

Out Of Control!!

Join Date: Jan 2005

Location: Texas

Posts: 11,266

Likes: 0

Received 3 Likes on 3 Posts

2005 E55

Quote:

Originally Posted by AsianML

I know that. It was a really bad joke.

I should have known that.

Reply Like

02-15-2006, 06:03 AM

#29

stevebez

MBWorld Fanatic!

Join Date: Jul 2005

Location: London, UK

Posts: 3,066

Likes: 22

Received 11 Likes on 8 Posts

No longer stock '06 E55, A3 3.2 Quattro, LRD4 HSE, R107 280SL

Well this is something that has worried me about delimiting the car ... we need tyres capable of 320km/h but we are issued with continentals and the only rating I could find on them were ZR if I remember correctly ... and thats only good for 240-250km/h

Also the reason the 030 cars have teh 186mph restriction is because of tyres.

Speed.............. Category
180 km/h (112 mph) - S
190 km/h (118 mph) - T
200 km/h (124 mph) - U
210 km/h (130 mph) - H
240 km/h (149 mph) - V (ZR)
270 km/h (168 mph)* W
300 km/h (186 mph)* Y (PS2)

So please beware guys !

Rgds Steve.

Reply Like

02-16-2006, 12:19 AM

#30

brt3

Senior Member

Join Date: Jun 2005

Posts: 339

Likes: 0

Received 0 Likes on 0 Posts

2012 C63 Black Series Coupe

Quote:

Originally Posted by stevebez

Well this is something that has worried me about delimiting the car... we need tyres capable of 320km/h but we are issued with continentals and the only rating I could find on them were ZR if I remember correctly ... and thats only good for 240-250km/hr. Also the reason the 030 cars have teh 186mph restriction is because of tyres.

Speed.............. Category
180 km/h (112 mph) - S
190 km/h (118 mph) - T
200 km/h (124 mph) - U
210 km/h (130 mph) - H
240 km/h (149 mph) - V (ZR)
270 km/h (168 mph)* W
300 km/h (186 mph)* Y (PS2)

So please beware guys ! Rgds Steve.

I couldn't agree more; running any kind of speed in a (relatively) heavy car is hell on tires. The only tire I'd consider for serious high-speed work is:

ContiSportContact 2/Vmax

Let the flames begin, as I know most people around these parts dislike the Contis. Please note that I'm talking about the requirements for a true high-speed tire; nothing else. From the Conti description:

The ContiSportContact 2 Vmax is Continental's Max Performance Summer tire that was designed to be the fastest "off-the-shelf" tire in the world. Intended for ultra-fast, high-end customized sport cars and performance sedans, the ContiSportContact 2 Vmax is the first road tire certified by Continental for speeds of up to 225 mph (360 km/h), a speed at which the tires must withstand revolving approximately 50 times every second while they carry the vehicle 330 feet (100 meters) down the road.