nasroo7

Hi,

The C300 is factory limited to 130Mph.

1. What kind of top speed can you get from the car if you remove the VMAX (Speed Limiter) ?
2. What kind of top speed can you get from having a Stage 1 tune (Without replacing parts, but just an ECU tune)?

superswiss

Typically the 130 mph limiter is put on cars that come with all-season tires from the factory due to their lower speed ratings. There is theoretical top speed and then there is the top speed that the tires can sustain. So if you plan to go above the factory limiter, the first order of business is to put tires with proper speed rating on the car and inflate them properly. The faster you go, the higher the tire pressure needs to be to cope with tire deflection and keep the tires from overheating. The theoretical top speed a car can achieve is purely a function of the horsepower needed to overcome the air resistance and road friction. The air resistance is a function of the coefficient of drag and the frontal area of the car, and road friction is a function of the car's weight. Here's a calculator that tells you how much horsepower is needed for a given speed based on the above parameters. You can find other calculators if you google.

http://www.wallaceracing.com/Calcula...or%20Speed.php

broomshk

i have gone 152 , i have a tune w205

nasroo7

Good info, I'll try to find the coeficient of drag and front surface of the w205


And as for tires, that goes without saying that you need the proper tire ratings.

nasroo7

What type of tune did you do?
how many HP does it have?

Was 152mph the max it went? Or more like the max you were able to get to due to you were unable to go faster because of things in front, or road not good enough...etc?