w208 Top Speed Delimited?

da_guitarist · 04-26-2009, 07:40 PM

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?

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Improviz · 04-27-2009, 02:00 AM

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.

da_guitarist · 04-27-2009, 02:40 AM

cool, thanks for going in so much detail! anyone w/ actual top speed results?

sick430 · 04-27-2009, 03:02 AM

thats awsome stuff

lychyrychy · 04-27-2009, 04:26 AM

Quote:

Originally Posted by Improviz

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.

I'm so impressed with the details

Chappy · 04-27-2009, 12:19 PM

No comment.

da_guitarist · 04-27-2009, 01:16 PM

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.

neilbo75 · 04-28-2009, 07:16 PM

Quote:

Originally Posted by da_guitarist

cool, thanks for going in so much detail! anyone w/ actual top speed results?

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....

ProjectC55 · 04-28-2009, 08:22 PM

Quote:

Originally Posted by Improviz

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.

Excellent info. And take it from me your calc's are pretty darn accurate if you know what I mean

hrothgar02 · 04-29-2009, 10:38 AM

A friend of mine and fellow board member stated that he ran 300 KMPH (186 MPH - per GPS) on is delimited W209 Coupe.

Chappy · 10-27-2009, 11:39 AM

I tripped across an earlier thread where Neilbo had chatted with a gent who owned a factory-delimited W208/55 that ran 295kph!!

HCUBED · 10-27-2009, 12:20 PM

How difficult is it to de-limit a W209?
Can anyone describe the process?

Chappy · 10-27-2009, 12:22 PM

Quote:

Originally Posted by HCUBED

How difficult is it to de-limit a W209?
Can anyone describe the process?

Your ECU will need to be flashed with another program. Any reputable aftermarket tuner can do this for you.

If you're in Europe, AMG can do this for you too.

blackbenzz · 10-27-2009, 02:33 PM

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.

Chappy · 10-27-2009, 03:24 PM

Quote:

Originally Posted by blackbenzz

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.

How fast is the CLK55 geared for top speed?

AMS Performance · 10-27-2009, 06:32 PM

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).

blackbenzz · 10-27-2009, 07:16 PM

Quote:

Originally Posted by Chappy

How fast is the CLK55 geared for top speed?

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)

AMS Performance · 10-28-2009, 06:01 AM

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.

Chappy · 10-28-2009, 08:08 AM

Quote:

Originally Posted by blackbenzz

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)

265-35-18s, my redline is still stock - what is that 6200?

Chappy · 10-28-2009, 08:09 AM

Quote:

Originally Posted by AMS Performance

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.

.....or a Garmin.

Chappy · 10-28-2009, 03:52 PM

Interesting:

Could this tool be used to delimit our CLK55s?

04-27-2009, 02:00 AM	#2
Improviz MBWorld Fanatic! Join Date: Sep 2002 Posts: 3,210 Drives: 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 pounds0.013 = 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^20.31* 0.00256 x (185)^2 = 551.37 pounds. So then required bhp to go 185 is (551.37 + 44.85)185/375 = 596.22185/375 = 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. __________________ 2006 CLS55 AMG w/030 Perf. Pkg. Obsidian Black/Charcoal Sold: 2001 CLK55 AMG Brilliant Silver, two-tone black/silver Last edited by Improviz; 04-27-2009 at 02:04 AM.

04-27-2009, 02:40 AM	#3
da_guitarist MBWorld Fanatic! Join Date: Sep 2006 Location: Atlanta, GA Posts: 1,465 Drives: 01 CLK55	cool, thanks for going in so much detail! anyone w/ actual top speed results? __________________

04-27-2009, 03:02 AM	#4
sick430 Super Member Join Date: Sep 2006 Location: So Cal Posts: 992 Drives: CLK430 Cabrio	thats awsome stuff __________________ CLK430 Cabrio, K2, K2A, K3, K4, Comand, Multicontour Front Seats.

04-27-2009, 12:19 PM	#6
Chappy MBWorld Fanatic! Join Date: Jul 2002 Location: Hotlanta Posts: 7,886 Drives: AMG	No comment. __________________ W208 CLK55 - 2002 (Silver w/Charcoal - 43K miles) 1 of 3,381 W208 AMG Coupes Worldwide 304WHP / 321TQ - Stock! W124 Estate - 1995 MBWGCM #71 Kombi's Uber Alles Member #3

04-27-2009, 01:16 PM	#7
da_guitarist MBWorld Fanatic! Join Date: Sep 2006 Location: Atlanta, GA Posts: 1,465 Drives: 01 CLK55	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. __________________

04-29-2009, 10:38 AM	#10
hrothgar02 Member Join Date: Aug 2007 Posts: 89	A friend of mine and fellow board member stated that he ran 300 KMPH (186 MPH - per GPS) on is delimited W209 Coupe. __________________ '04 CLK 55 Cab '04 BMW R1150R Rockster '06 Honda Hybrid

10-27-2009, 11:39 AM	#11
Chappy MBWorld Fanatic! Join Date: Jul 2002 Location: Hotlanta Posts: 7,886 Drives: AMG	I tripped across an earlier thread where Neilbo had chatted with a gent who owned a factory-delimited W208/55 that ran 295kph!! __________________ W208 CLK55 - 2002 (Silver w/Charcoal - 43K miles) 1 of 3,381 W208 AMG Coupes Worldwide 304WHP / 321TQ - Stock! W124 Estate - 1995 MBWGCM #71 Kombi's Uber Alles Member #3

10-27-2009, 12:20 PM	#12
HCUBED Junior Member Join Date: Nov 2008 Posts: 50 Drives: W209 2003 CLK55 Coupe	How difficult is it to de-limit a W209? Can anyone describe the process?

10-27-2009, 02:33 PM	#14
blackbenzz MBWorld Fanatic! Join Date: Feb 2003 Location: Maryland Posts: 7,818 Drives: 01 Kleemann CLK55, 99 CLK430	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. __________________ Run Your Car Not Your Mouth This is how we roll

10-27-2009, 06:32 PM	#16
AMS Performance SPONSOR Join Date: Sep 2008 Posts: 1,313 Drives: AMG	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). __________________ << E55, C55, CLK55, CL55, SL55, SLK 55, S55 Headers >> << New W202 C43 AMG Stage 2 Performance Package !! >> << New 230, 280, 350 & 550 Pulleys for M272 & M273!! >> << Gen2 C36 / C280 / E320 M104 OEM+ Pulley Design! (under $300) >> (contact via email for more details) << M119 Performance OEM+ Dampers now available! >> <<< AMS WEBSITE >>> (New Products)

10-28-2009, 06:01 AM	#18
AMS Performance SPONSOR Join Date: Sep 2008 Posts: 1,313 Drives: AMG	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. __________________ << E55, C55, CLK55, CL55, SL55, SLK 55, S55 Headers >> << New W202 C43 AMG Stage 2 Performance Package !! >> << New 230, 280, 350 & 550 Pulleys for M272 & M273!! >> << Gen2 C36 / C280 / E320 M104 OEM+ Pulley Design! (under $300) >> (contact via email for more details) << M119 Performance OEM+ Dampers now available! >> <<< AMS WEBSITE >>> (New Products)

10-28-2009, 03:52 PM	#21
Chappy MBWorld Fanatic! Join Date: Jul 2002 Location: Hotlanta Posts: 7,886 Drives: AMG	Interesting: Could this tool be used to delimit our CLK55s? __________________ W208 CLK55 - 2002 (Silver w/Charcoal - 43K miles) 1 of 3,381 W208 AMG Coupes Worldwide 304WHP / 321TQ - Stock! W124 Estate - 1995 MBWGCM #71 Kombi's Uber Alles Member #3

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