Clk Drag Limit
Thread Starter
Member
Joined: Mar 2002
Posts: 135
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From: Chicago
CLK 430
Clk Drag Limit
We've seen several posts with incredible mph claims and 0-60 times lately.
My question is....what is the maximum mph attainable for the CLK body style given it's drag coefficient?
Surely....this body style cannot attain 180 mph?
Anyone have a clue? Ben ?
quaz
My question is....what is the maximum mph attainable for the CLK body style given it's drag coefficient?
Surely....this body style cannot attain 180 mph?
Anyone have a clue? Ben ?
quaz
Thread Starter
Member
Joined: Mar 2002
Posts: 135
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From: Chicago
CLK 430
REALLY ??? Over 200 mph???
Let's see as I surf the net...I see something that says that a "slippery" road car has a drag coefficient of .32....a "chunky" one would be over .38 .
By the measuring stick, the CLK is actually fairly "slippery"!!
I guess I look at my CLK...then at a Corvette say....and I just think "ok...the vette has got to be a heck of a lot more slippery". My CLK just seems too round and high compared to even a stock corvette.
Looks like a corvette C5 has a drag coefficient of .29 .
http://www.neosoft.com/~cbjetboy/c5specs.htm
NOW,
The top speed of an Aston Martin Vanquish is 187 mph, drag limited.
So how could a CLK...with any engine...do better than that? Keep in mind I'm nowhere NEAR knowledgeable on this...just did some random searches under "top speed drag limited" on yahoo.
quaz
Let's see as I surf the net...I see something that says that a "slippery" road car has a drag coefficient of .32....a "chunky" one would be over .38 .
By the measuring stick, the CLK is actually fairly "slippery"!!
I guess I look at my CLK...then at a Corvette say....and I just think "ok...the vette has got to be a heck of a lot more slippery". My CLK just seems too round and high compared to even a stock corvette.
Looks like a corvette C5 has a drag coefficient of .29 .
http://www.neosoft.com/~cbjetboy/c5specs.htm
NOW,
The top speed of an Aston Martin Vanquish is 187 mph, drag limited.
So how could a CLK...with any engine...do better than that? Keep in mind I'm nowhere NEAR knowledgeable on this...just did some random searches under "top speed drag limited" on yahoo.
quaz
Out Of Control!!
Joined: Nov 2001
Posts: 35,855
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From: Southern CA
Both factors, as well as gearing, are very important in determining a car's top speed. Due to drag, there becomes a point where more HP is not as effective because the car is fighting too much resistance.
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Joined: Dec 2001
Posts: 581
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From: Dallas
C32 AMG
I think that when car magazines say "drag-limited" they mean that at top speed the engine still has a few more rpms available - it just doesn't have the horsepower to push the body any faster
"Rpm limited" would mean that the car might have gone faster, but the rpm limit on the engine would be exceeded (or the rev limiter kicked in).
MBs of course are electronically limited (usually
) so they only go what our revered Benz engineers say they can go.
Air resistance goes up as the cube of the speed, so doubling your horsepower should only give you about 26% speed increase ( 2 ^ 1/3) assuming no other constraints (tire friction, etc.)
"Rpm limited" would mean that the car might have gone faster, but the rpm limit on the engine would be exceeded (or the rev limiter kicked in).
MBs of course are electronically limited (usually
) so they only go what our revered Benz engineers say they can go.Air resistance goes up as the cube of the speed, so doubling your horsepower should only give you about 26% speed increase ( 2 ^ 1/3) assuming no other constraints (tire friction, etc.)
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Member
Joined: Jun 2002
Posts: 198
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From: Southern California
C63s coupe
Ditto, its HP, drag, RPM, etc.
Basically, it starts with two opposed forces, HP and drag. Top speed is controlled by whether one has enough HP to overcome drag, and that includes enough at all intermediate speeds until top speed. This is where RPM and gearing come in. If you cannot overcome the drag at 135mph you are not going to make it to 155mph, even if that is peak on the HP/RPM curve.
My understanding, and here I am less certain of automotive standards, is that drag is expressed as a ratio or a relative value, and thus one needs the cross section of the particular object to determine the actual HP needed to overcome the drag on it. By example, my CLK55 and a 747 jet might have the same drag ratio, but a 747 obviously presents a greater cross-section and requires greater HP (force) to get the job done.
My CLK55 is good for 155, where the speed limiter cuts in (yes, I have tried that, and do not ask me to make an admission against interest and say were). According to European road tests, an unlimited CLK55 will do 179.5mph, but that is at red-line, and where the rpm limiter cuts in. With the rev limiter disabled, a rear-end gear ratio change, or tires with a different radius than stock, it might do more.
Frankly, IMHO, one needs very good road surface to do any better than 140mph in a stock CLK anyway.
My understanding, and here I am less certain of automotive standards, is that drag is expressed as a ratio or a relative value, and thus one needs the cross section of the particular object to determine the actual HP needed to overcome the drag on it. By example, my CLK55 and a 747 jet might have the same drag ratio, but a 747 obviously presents a greater cross-section and requires greater HP (force) to get the job done.
My CLK55 is good for 155, where the speed limiter cuts in (yes, I have tried that, and do not ask me to make an admission against interest and say were). According to European road tests, an unlimited CLK55 will do 179.5mph, but that is at red-line, and where the rpm limiter cuts in. With the rev limiter disabled, a rear-end gear ratio change, or tires with a different radius than stock, it might do more.
Frankly, IMHO, one needs very good road surface to do any better than 140mph in a stock CLK anyway.
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Joined: Nov 2001
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From: Los Angeles
Re: Ditto, its HP, drag, RPM, etc.
Originally posted by rroberts
Frankly, IMHO, one needs very good road surface to do any better than 140mph in a stock CLK anyway.
Frankly, IMHO, one needs very good road surface to do any better than 140mph in a stock CLK anyway.
.
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Joined: Feb 2002
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The renntech CLK GTX can do a 0 to 60 mph in 3.8 seconds and hits a top speed of 220 mph!!
3,8 to 60, right
Did it ever occur to any body, that it's impossible to bring a 2 ton
CLK from 0 - 60 in 3,8 sec.
Any body which have tried a KLEEMANN CLK 55 K will know.
It's for sure not because there isn't power to do it, but simply a traction problem.
3,8 to 60, right
Did it ever occur to any body, that it's impossible to bring a 2 ton
CLK from 0 - 60 in 3,8 sec.
Any body which have tried a KLEEMANN CLK 55 K will know.
It's for sure not because there isn't power to do it, but simply a traction problem.
Member
Joined: Mar 2002
Posts: 195
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2012 GL350
Did it ever occur to any body, that it's impossible to bring a 2 ton
CLK from 0 - 60 in 3,8 sec.
Any body which have tried a KLEEMANN CLK 55 K will know.
CLK from 0 - 60 in 3,8 sec.
Any body which have tried a KLEEMANN CLK 55 K will know.
http://www.caranddriver.com/xp/Caran...enntech&page=2
Oh wait how about 0-60 in 3.7 seconds from the Renntech SLR7.4 that was in Car and Drivers 0-150-0 test???
Face it, these cars have a better way of getting the power to the road.
