BMW M3 and BMW M4 Forum - View Single Post - M4cs Power output analysis

CanAutM3 · 04-21-2017, 10:49 AM

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 base and Comp Pack rated power curves 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?

EDIT (Nov-2017)
On a quiet, cold and rainy Sunday afternoon, I had a little time to kill. So I set out to capture test results from European publications (mostly German) for acceleration to compare the different M4 variants. To remove the effect of the added grip at launch provided by PSC2 when the cars are so fitted, I only set out to capture the 100 to 200km/h acceleration. I compiled 21 different tests and then averaged the results for each M4 variant (DCT only). While this is not the most scientific approach, it does provide a decent perspective. Here are the results:

100km/h -> 200km/h acceleration
9.52 M4 Base (6 samples)
.... ∆ 0.20
9.32 M4 CP (9 samples)
.... ∆ 0.67
8.65 M4 cs (4 samples)
.... ∆ 0.20
8.45 M4 GTS (2 samples)

First, I think this dispels the rumours that the CP is not any quicker than the base model, having a ~0.2 second advantage from 100 to 200km/h. Second, it also shows how the CS pulls quite strongly in the top end, being ~0.7 seconds faster than the CP and only ~0.2 seconds short of the mighty water injected GTS. Which is in line with the conclusion reached when looking at the power charts

.

CS in black, CP in red, base S55 in blue:

04-21-2017, 10:49 AM	#1
CanAutM3 General 21117 Rep 20,741 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	M4cs Power output analysis - This S55 variant is quite potent 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 base and Comp Pack rated power curves 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? EDIT (Nov-2017) On a quiet, cold and rainy Sunday afternoon, I had a little time to kill. So I set out to capture test results from European publications (mostly German) for acceleration to compare the different M4 variants. To remove the effect of the added grip at launch provided by PSC2 when the cars are so fitted, I only set out to capture the 100 to 200km/h acceleration. I compiled 21 different tests and then averaged the results for each M4 variant (DCT only). While this is not the most scientific approach, it does provide a decent perspective. Here are the results: 100km/h -> 200km/h acceleration 9.52 M4 Base (6 samples) .... ∆ 0.20 9.32 M4 CP (9 samples) .... ∆ 0.67 8.65 M4 cs (4 samples) .... ∆ 0.20 8.45 M4 GTS (2 samples) First, I think this dispels the rumours that the CP is not any quicker than the base model, having a ~0.2 second advantage from 100 to 200km/h. Second, it also shows how the CS pulls quite strongly in the top end, being ~0.7 seconds faster than the CP and only ~0.2 seconds short of the mighty water injected GTS. Which is in line with the conclusion reached when looking at the power charts . CS in black, CP in red, base S55 in blue: Attached Images __________________ Porsche 911 turbo 2021 992 GT Silver Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black Last edited by CanAutM3; 09-15-2018 at 12:52 PM..
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