Curious to know why some sources say 503hp and others say 510hp. Which one is it?

In Australia my 2017 C63s Coupe is listed as having "375kw" which translates to 503hp. But why do other sources and magazine articles state that these cars have 510hp?

Cheers,
Jimmy.

510 is metric horsepower. 503 is non-metric horsepower. Exact same engine power output, they just calculate it slightly differently.

Kind of like how the McLaren 720S is named after having 720hp yet in US it's rated at slightly less.

Ah! I get it. Now I feel silly. Thanks for clearing this up

Renntech dynos the stock U.S. C63s at 545 hp in comparison to Mercedes at 503 hp . Reminds me of the 1970's when car companies deliberately underated their hp for the purpose of public image (insurance.)

Is that 545 MP to the wheels or the crank?

See, in America we have stronger horses than the metric horses you've traditionally used in Europe and elsewhere. That's why it takes less horsepower to generate the same amount of performance.

crank

What's the actual wheel? I have a W205 C63S and interested!

simple search https://mbworld.org/forums/c63-c63s-...o-results.html

Ha! I thought so.

For me, the C63s pulls a sh*t load harder than my stock MKII Gallardo LP550-2. Not sure if it's because of the 700nm but if I put the C63 in 3rd gear and plant the pedal from a rolling start all the way to the top, it really gives me that feeling like I'm being catapulted into the horizon.

With the Gallardo, I have to work a bit more through the revs to pull and it doesn't have no where near as much "stomach churn" as the AMG. Crazy car this C63s

545 hp Crank. 468 hp at rear wheels = (545 hp minus 14% drive train loss.)

Thanks, I thought hp was hp. It did not occur to me that there would be difference (like the one between imperial and U.S. gallons).

I had been attributing the difference to the available gas. In Europe it is easy to get 100 octane (e.g., many Shell stations have it) but in the U.S. 93 octane is the best available and here in California all that is available for street use is 91 octane.

It's because the HP is higher than the torque values. This translates to getting the engine way up into the high RPM areas to get a decent response out of the engine. As an example, I owned a 2009 GT500. 500 HP/500TQ. I test drove a beautiful 2009 M6 convertible with 500hp/350TQ with 6 speed manual. It felt like a dog! Then I realized, 'oh wait, this is an M6' and remembered to rev the snot out of it to get it as responsive as my Shelby.

That's because the C63S makes more hp at lower rpms. HP = TQ * rpm / 5252, so there are two ways to make the power. Either increasing torque or rpm. The C63's engine has high low end torque so it makes more HP down low, vs the Gallardo and other naturally aspirated high revving engines which make their power using revs, so you have to rev them high to make the same power. This relationship is widely misunderstood and misquoted even by car journalists. Many think torque is what accelerates a car, but it's horsepower. Horsepower is the rate of work being performed and the more work performed in a given time the faster the car accelerates and the higher the top speed it can achieve. Torque is simply a force and can be easily manipulated with leverage (gearing).

European octane is not the same as US octane. There are several different octane ratings. Europe uses the RON rating, where as the US uses (R+M)/2. 100 RON is about 93 (R+M)/2.

https://en.wikipedia.org/wiki/Octane_rating