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SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

Top Speed For The 5.5 Liter?

 
Old 01-10-2016, 04:34 AM
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Top Speed For The 5.5 Liter?

Just curious though I would never be considered a speed demon and actually am a conservative driver. What is the theoretical maximum speed of the 2008 SL550? Thanks.....
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Old 01-10-2016, 08:29 AM
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All non-AMG Mercedes in the US have a 130MPH maximum speed governed by the engine controller. Your car will easily achieve this speed, and it won't take long to get there. I am guessing, but absent the governor I would say about 160, given that it has 385HP.
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Old 01-10-2016, 09:03 AM
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You can get the governor turned off with most any ECU tune. Just a couple days ago somebody asked this question on the CLK forum and one 550 guy claimed to have driven his at 170. I recall somebody else a while back said 176.
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Old 01-10-2016, 09:06 AM
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Oh, and if you know somebody withe MB STAR system, you can reset the governor to 150. Over that you need a tune to remove it.
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Old 01-10-2016, 12:16 PM
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Originally Posted by Yidney View Post
Oh, and if you know somebody withe MB STAR system, you can reset the governor to 150. Over that you need a tune to remove it.
I think you can completely remove with star or at the very least move it to the 186 AMG performance package limit.
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Old 02-12-2016, 12:05 AM
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I've had my 07 up to 155mph, that is the limit set by the computer
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Old 02-12-2016, 11:28 AM
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I've had my '07 SL550 popped up to 140. It gets there quickly. Very quickly. The car was still pulling strongly and was headed straight for 145 and beyond ... but the governor on my nerves told me to back off. I spent a life in aviation ... I know a bit about going fast. But 140 in a car ... that's the fastest I've ever rolled across the Earth's surface. Once was enough. There was a time long ago when I joked about die young and make a good-looking corpse. That opportunity no longer exists for me.
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Old 02-12-2016, 09:28 PM
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With an SDS, you can change the Electronic Governor. Been Awhile since I did it but think max is 208mph setting. Make sure your tires are Y Rated
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Old 02-13-2016, 12:47 PM
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I've had my motorcycle up to 165mph, that was easier than in the SL and it slowed down a lot quicker. In the SL, it took a long time to slow back down to 65. For some strange reason it felt safer on the motorcycle.
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Old 02-13-2016, 01:40 PM
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Originally Posted by Shadow5501 View Post
All non-AMG Mercedes in the US have a 130MPH maximum speed governed by the engine controller. Your car will easily achieve this speed, and it won't take long to get there. I am guessing, but absent the governor I would say about 160, given that it has 385HP.
That isn't true. There are a lot of US non AMG cars limited at 155 and not all AMG cars are limited at 186 some are less than that.
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