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my build sheet has a purchase of an increase in top speed code 251. Online it says the top speed is 135 but I've passed 147. Does anyone know what the top speed is or what all is involved with this option. I have attached my build sheet
Your car was optioned with the R01 High Performance tires, so the electronically limited top speed is increased to 155 mph. The MOE all-season tires have a lower speed rating, so if the car is optioned with MOE tires then the electronically limited top speed is 135 mph. It's all about the tires. The 63 and above models have a pay to increase the top speed option, although it's standard in the USA. The C63S' top speed is 180 mph for example. At some point the top speed is limited by the power. Remember that drag is proportional to the square of the speed, so to go twice as fast you need four times the power and so on. The more power the car makes the higher the theoretical top speed, but again the tires have to keep up. The highest speed rating is (Y) which only says 186+ mph, but doesn't specify how much above 186 mph. That ultimately comes down to the specific tire. Car manufacturers work with the tire manufacturers to make sure the OE tires have enough headroom. That's what the manufacturer designation on the sidewall is for. MO1 and MO2 for AMG vehicles. MO for regular MBs and MOE for the extended mobility tires. The electronically limited top speed factors in the max theoretical top speed and the safety headroom of the tires. Can't go 180 mph if you don't have the power nor the tires to achieve those speeds safely.
Last edited by superswiss; May 30, 2023 at 03:52 PM.
Build sheets for Benz will say limit 186 not taking about tires.
I understand how the tires and limit need to work
but if he’s gone over 135, then 155 is the next logical limit.
just go drive and see. Can prob hit 158 with a 155 limiter
Yes, as I said, with the R01 tire option the top speed is 155 mph for the C43, otherwise it's 130 mph (I incorrectly said 135 mph). Also, the speedometer can show up to 10% higher than the actual speed, so for actual speed you need to use a GPS timing device.
Last edited by superswiss; May 30, 2023 at 04:32 PM.
All MB Sports cars go to 155 but the AMG go to 190 so the increase top speed on the 43 AMG is to 170
Sorry, but that's not even remotely correct. As I said above, the summer performance tire option where available raises the C43 top speed from 130 to 155. That's all there is to it.
Oh, I guess Mercedes changed some things as all their Sport models used to top out at 155 but that could also be their EURO spec.
From what I read is the following: The C450 AMG is limited to 155 mph, while the V-8–powered AMG C63, by contrast, can be opened up to 180 mph, if you're willing to pay for it (C63s) and the C43 top speed with the optional AMG Driver's Package is 165 mph. So Speed from 155 to 165 would be the increased speed.
Last edited by Cosworth2000; Jun 1, 2023 at 03:32 PM.
Oh, I guess Mercedes changed some things as all their Sport models used to top out at 155 but that could also be their EURO spec.
From what I read is the following: The C450 AMG is limited to 155 mph, while the V-8–powered AMG C63, by contrast, can be opened up to 180 mph, if you're willing to pay for it (C63s) and the C43 top speed with the optional AMG Driver's Package is 165 mph. So Speed from 155 to 165 would be the increased speed.
Yes, things changed a bit over the years. 155 mph used to be the Gentlemen's agreement and not much coming out of Germany was going faster than that, even if power would have allowed for it. But they discovered that people are willing to pay for a higher top speed. Understandably when in Germany specifically you can actually drive that fast legally. I had my C63S up to 180 mph on the German Autobahn, so that's a daily reality over there.
The other thing to understand is the above are US specs and as I said, the 130 limit is because of the all-season tires. Pretty much nobody in Europe orders all-season tires and the C63/S only comes with summer performance tires. All-season tires are mainly a North American thing. Europeans change between summer and winter tires as it should be, so the C43s sold in Europe generally have summer performance tires on them from the factory, so they have the 155 mph top speed instead of the lowered top speed for North America due to the tires. During the winter months the tire installers usually put a sticker on the dashboard in Germany to remind drivers that they can't drive as fast as the car goes while the winter tires are on it.
This is what you find in German cars during the winter. Depending on the speed rating of the winter tires it's lower than 240 kph (150 mph). The sticker in my most recent rental car I had said 210 kph max, which is ~130 mph.
Last edited by superswiss; Jun 1, 2023 at 04:17 PM.
hahahah. Race track. I live in houston texas I was 152 the other day only slowed down cause I saw some cars coming up on my right people tend to do stupid things when you pass them over double the speed limit.
Top speed limiter is optioned.
The C43 (FL at least) DOES NOT get the limiter increased based on the tires it is delivered with
its correct that the proper tires are required in order to chose that increased top speed limiter.
weird I bought this car out of California who has the strictest laws and most insane rules so i was little concerned if I was going to run into some weird issues. I guess I'll let y'all know if I get it past 155. Lots of places in houston to get up that fast.
I haven't done anything to the car other than cosmetic stuff it only has about 1400 miles on it.. I got a highly optioned c43. How disappointing that would be to buy an amg and at 133 it tops out. I've been faster ina 4 door 10 year old accord.
I haven't ran any times yet. I see alot of people talk about running gps. Any idea what app they use I've used speedometer and speed box but that was for my Cuda due to all the mods the Speedo is way off.
Sorry, but that's not even remotely correct. As I said above, the summer performance tire option where available raises the C43 top speed from 130 to 155. That's all there is to it.
where did you find this. Is this for a specific year. I tend to find different info everywhere I look. I joined this forum for all the knowledge on here. Mercedes stuff seems to be different depending on where you look. Car and driver has 0-60 at 4.1 for the fl c43. Bmw seems to have more cohesive numbers and information from one sight to the next.
Last edited by Houstonchiro; Jun 2, 2023 at 05:05 AM.
Sorry, but that's not even remotely correct. As I said above, the summer performance tire option where available raises the C43 top speed from 130 to 155. That's all there is to it.
where did you find this. Is this for a specific year. I tend to find different info everywhere I look. I joined this forum for all the knowledge on here. Mercedes stuff seems to be different depending on where you look. Car and driver has 0-60 at 4.1 for the fl c43. Bmw seems to have more cohesive numbers and information from one sight to the next.
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Increase in top speed
