w208 Top Speed Delimited?
04-26-2009, 06:40 PM
#1
MBWorld Fanatic!
Thread Starter
w208 Top Speed Delimited?
Does anyone have experience knowing where the w208 CLK55 tops out w/ the ECU speed limiter removed? I was guessing it would hit somewhere in the 180 mph range or so, but not really sure.
Edit: ghetto calculations in excel say ~205 mph. But that doesn't include increased speed/drag effects, so it's not accurate. So anyone with a trial run?
Edit: ghetto calculations in excel say ~205 mph. But that doesn't include increased speed/drag effects, so it's not accurate. So anyone with a trial run?
Last edited by da_guitarist; 04-26-2009 at 06:46 PM.
04-27-2009, 01:00 AM
#2
MBWorld Fanatic!
Join Date: Sep 2002
Posts: 3,679
Likes: 0
Received 0 Likes
on
0 Posts
CLS55 AMG
Quoted from an earlier post, a long time ago in a galaxy far away:
Here you go.
You need three things: rolling resistance, air resistance, and rear wheel horsepower (and, of course, the gearing to get there, which was addressed previously).
Rolling resistance: 3450 pounds*0.013 = 44.85 pounds (edit: yeah, I know, forgot to include the weight of driver!! Re-ran using 150 pound driver, and it changed it to 295 rwhp in case anyone cares...)
Air resistance: calculated frontal area (based upon 67.8" width, 54" height) is 20.3 ft^2 . Car's Cd = 0.31 .
So, to go 185 mph, the car would meet an air resistance of 20.3 ft^2*0.31* 0.00256 x (185)^2 = 551.37 pounds.
So then required bhp to go 185 is (551.37 + 44.85)*185/375 = 596.22*185/375 = 294 rear wheel horsepower.
CLK55s usually dyno out at 290-295 rwhp. So, it calculates out to hit 185, with drag, frontal area, and rolling resistance factored in.
You need three things: rolling resistance, air resistance, and rear wheel horsepower (and, of course, the gearing to get there, which was addressed previously).
Rolling resistance: 3450 pounds*0.013 = 44.85 pounds (edit: yeah, I know, forgot to include the weight of driver!! Re-ran using 150 pound driver, and it changed it to 295 rwhp in case anyone cares...)
Air resistance: calculated frontal area (based upon 67.8" width, 54" height) is 20.3 ft^2 . Car's Cd = 0.31 .
So, to go 185 mph, the car would meet an air resistance of 20.3 ft^2*0.31* 0.00256 x (185)^2 = 551.37 pounds.
So then required bhp to go 185 is (551.37 + 44.85)*185/375 = 596.22*185/375 = 294 rear wheel horsepower.
CLK55s usually dyno out at 290-295 rwhp. So, it calculates out to hit 185, with drag, frontal area, and rolling resistance factored in.
Last edited by Improviz; 04-27-2009 at 01:04 AM.
04-27-2009, 03:26 AM
#5
Senior Member
Join Date: Mar 2009
Posts: 333
Likes: 0
Received 0 Likes
on
0 Posts
clk55
Here you go.
You need three things: rolling resistance, air resistance, and rear wheel horsepower (and, of course, the gearing to get there, which was addressed previously).
Rolling resistance: 3450 pounds*0.013 = 44.85 pounds (edit: yeah, I know, forgot to include the weight of driver!! Re-ran using 150 pound driver, and it changed it to 295 rwhp in case anyone cares...)
Air resistance: calculated frontal area (based upon 67.8" width, 54" height) is 20.3 ft^2 . Car's Cd = 0.31 .
So, to go 185 mph, the car would meet an air resistance of 20.3 ft^2*0.31* 0.00256 x (185)^2 = 551.37 pounds.
So then required bhp to go 185 is (551.37 + 44.85)*185/375 = 596.22*185/375 = 294 rear wheel horsepower.
CLK55s usually dyno out at 290-295 rwhp. So, it calculates out to hit 185, with drag, frontal area, and rolling resistance factored in.
You need three things: rolling resistance, air resistance, and rear wheel horsepower (and, of course, the gearing to get there, which was addressed previously).
Rolling resistance: 3450 pounds*0.013 = 44.85 pounds (edit: yeah, I know, forgot to include the weight of driver!! Re-ran using 150 pound driver, and it changed it to 295 rwhp in case anyone cares...)
Air resistance: calculated frontal area (based upon 67.8" width, 54" height) is 20.3 ft^2 . Car's Cd = 0.31 .
So, to go 185 mph, the car would meet an air resistance of 20.3 ft^2*0.31* 0.00256 x (185)^2 = 551.37 pounds.
So then required bhp to go 185 is (551.37 + 44.85)*185/375 = 596.22*185/375 = 294 rear wheel horsepower.
CLK55s usually dyno out at 290-295 rwhp. So, it calculates out to hit 185, with drag, frontal area, and rolling resistance factored in.
I'm so impressed with the details
04-27-2009, 12:16 PM
#7
MBWorld Fanatic!
Thread Starter
For the record, I do *not* condone driving at speeds like this anywhere except the track. The reason I'm curious is because the newer vehicles have 6-7 and even 8 spd automatic transmissions, and the final gear ratio is a little lower. So I'm curious at what our car can do w/ its factory setup with no regulation as compared to newer vehicles with lower final gear ratios.
Trending Topics
04-28-2009, 06:16 PM
#8
Super Member
Join Date: Mar 2006
Location: living in Paris, France and San Diego ...
Posts: 528
Likes: 0
Received 0 Likes
on
0 Posts
2002 CLK 55 AMG Coupé
I have got up to 262 km/hour on the Autobahn - car was still accelerating nicely but traffic then slowed me down. It is not that easy to really open it up in Germany - but sooner or later I will let you know....
04-28-2009, 07:22 PM
#9
MBWorld Fanatic!
Here you go.
You need three things: rolling resistance, air resistance, and rear wheel horsepower (and, of course, the gearing to get there, which was addressed previously).
Rolling resistance: 3450 pounds*0.013 = 44.85 pounds (edit: yeah, I know, forgot to include the weight of driver!! Re-ran using 150 pound driver, and it changed it to 295 rwhp in case anyone cares...)
Air resistance: calculated frontal area (based upon 67.8" width, 54" height) is 20.3 ft^2 . Car's Cd = 0.31 .
So, to go 185 mph, the car would meet an air resistance of 20.3 ft^2*0.31* 0.00256 x (185)^2 = 551.37 pounds.
So then required bhp to go 185 is (551.37 + 44.85)*185/375 = 596.22*185/375 = 294 rear wheel horsepower.
CLK55s usually dyno out at 290-295 rwhp. So, it calculates out to hit 185, with drag, frontal area, and rolling resistance factored in.
You need three things: rolling resistance, air resistance, and rear wheel horsepower (and, of course, the gearing to get there, which was addressed previously).
Rolling resistance: 3450 pounds*0.013 = 44.85 pounds (edit: yeah, I know, forgot to include the weight of driver!! Re-ran using 150 pound driver, and it changed it to 295 rwhp in case anyone cares...)
Air resistance: calculated frontal area (based upon 67.8" width, 54" height) is 20.3 ft^2 . Car's Cd = 0.31 .
So, to go 185 mph, the car would meet an air resistance of 20.3 ft^2*0.31* 0.00256 x (185)^2 = 551.37 pounds.
So then required bhp to go 185 is (551.37 + 44.85)*185/375 = 596.22*185/375 = 294 rear wheel horsepower.
CLK55s usually dyno out at 290-295 rwhp. So, it calculates out to hit 185, with drag, frontal area, and rolling resistance factored in.
10-27-2009, 11:22 AM
#13
MBWorld Fanatic!
10-27-2009, 01:33 PM
#14
Out Of Control!!
You dont take gearing into consideration? I know the CLK55 is geared to go faster than 185mph so I guess it's not necessary to consider it in this case. I don't know how fast my car goes. Just know it gets to the 160mph on the cluster and is still pulling pretty good.
10-27-2009, 02:24 PM
#15
MBWorld Fanatic!
You dont take gearing into consideration? I know the CLK55 is geared to go faster than 185mph so I guess it's not necessary to consider it in this case. I don't know how fast my car goes. Just know it gets to the 160mph on the cluster and is still pulling pretty good.
10-27-2009, 05:32 PM
#16
gearing wise its limited to roughly 180-185... however if you get the 6400rpm redline, you may be able to squeeze out a bit more but honestly its tough to say without actually doing in (at a safe testing facility of course).
10-27-2009, 06:16 PM
#17
Out Of Control!!
Depends on tire and redline. With a 265 35 18 tire and 6000rpm redline it gears out at 193mph. Give me your rear tire diameter and redline and I will tell you (as long as your trans and diff gearing is still stock; I can adjust accordingly if you've made other changes)
10-28-2009, 05:01 AM
#18
Also keep in mind, at higher speeds the speedo accuracy margin of error increases so you would need a high quality GPS based performance meter to get a truly accurate number.
10-28-2009, 07:08 AM
#19
MBWorld Fanatic!
Depends on tire and redline. With a 265 35 18 tire and 6000rpm redline it gears out at 193mph. Give me your rear tire diameter and redline and I will tell you (as long as your trans and diff gearing is still stock; I can adjust accordingly if you've made other changes)
10-28-2009, 07:09 AM
#20
MBWorld Fanatic!
12-03-2016, 03:26 PM
#24
Newbie
Join Date: Dec 2016
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Clk55 amg
Black ***** to 187mph
2003 CLK55 with only a usa speedtuning chip and removed top speed limiter, cats hollowed out, straight pipes, k&n filter and custom front bumper... Still pulling at 187 mph. Car had more power than I had *****!
12-03-2016, 03:35 PM
#25
MBWorld Fanatic!
