Quote:
Originally Posted by CanAutM3
I originally posted this in the M4CS thread, but decided to start a separate thread in the engine section for a more in depth technical discussion. The S55 variant in the M4CS seems to be quite potent. Much more so than the modest 10hp peak increase over the CP suggests.
I had a little fun plotting the Comp Pack rated power curve over the CS (preliminary) rated power curve. It is interesting to see that the CS provides substantially more area under the curve over the CP compared to what the CP provides over the base S55; and this despite having half the peak gain (10hp vs 19hp). That is what 37lb-ft of extra torque does for you  . It should make the CS quite quicker than the CP and even more so than the base M3/4. It's also interesting to notice the CS has less power than the CP and base S55 below ~2300RPM. I wonder what changes were made to the engine? Is this the result solely from a different tune?
CS in black, CP in red, base S55 in blue: |
With all due respect, and I know you're enjoying the analysis of the CS, you can derive almost zero conclusion from overlaying the gimmicky Excel graph outputs that BMW publishes in its marketing materials.