[jayg80]

Are there mechanical (intake, exhaust, engine) differences between the M2C and the M3/M4 that contributes to the 20 hp variance or is it just in the software tuning BMW wanted to create a little separation?

[Say Chi Sin Lo]

My vote goes to the software/ecu tuning.

[ChrisK]

Originally Posted by jayg80

Are there mechanical (intake, exhaust, engine) differences between the M2C and the M3/M4 that contributes to the 20 hp variance or is it just in the software tuning BMW wanted to create a little separation?

MR. confirmed that the S55 in the M2C is exactly the same as the S55 in the M3/M4.

The de-tune is just software. Re-Tune the De-Tune

[m20e3087]

Originally Posted by ChrisK

@MR confirmed that the S55 in the M2C is exactly the same as the S55 in the M3/M4.

The de-tune is just software. Re-Tune the De-Tune

Retune the detune

[M3_WC]

I have no doubt it is software only. Just by comparing peak hp at peak rpm. M2C is 410hp at 7000rpm, while M3/M4 is 425hp at 7300rpm. Guarantee the curves overlap perfectly, but M2C has a power target and power starts dropping off at 7000.

[Say Chi Sin Lo]

Originally Posted by M3_WC

I have no doubt it is software only. Just by comparing peak hp at peak rpm. M2C is 410hp at 7000rpm, while M3/M4 is 425hp at 7300rpm. Guarantee the curves overlap perfectly, but M2C has a power target and power starts dropping off at 7000.

M2C peak power comes at 7000rpm, has anyone confirmed the actual redline yet? (unmolested from factory)

[M-Pilot]

Getting an M4 CS tune will be the first thing I'll do after my break-in service!

The following is from another thread and credit goes to CanAutM3

M4 CS in black, M3/M4 CP in red, M3/M4 base S55 in blue:

[M3_WC]

Originally Posted by Say Chi Sin Lo

M2C peak power comes at 7000rpm, has anyone confirmed the actual redline yet? (unmolested from factory)

M2C/M3/M4 S55 all redline at 7600(per instrument clusters). Their peak hp at peak rpm is different only due to tune. Turbo motors, they all die off before redline. S55 does mitigate that a little, compared with other BMW turbo inline 6.

[jayg80]

If it's just a simple tune, BMW should offer a MPPK for M2C owners interested in more power like they do on the 3/4 series.

[Say Chi Sin Lo]

Originally Posted by M3_WC

M2C/M3/M4 S55 all redline at 7600(per instrument clusters). Their peak hp at peak rpm is different only due to tune. Turbo motors, they all die off before redline. S55 does mitigate that a little, compared with other BMW turbo inline 6.

So in regards to the peak power. Is it restricted by the software, or if it's mechanical and the turbo is out of its efficiency range beyond 7,000rpm?

[M3_WC]

Originally Posted by Say Chi Sin Lo

So in regards to the peak power. Is it restricted by the software, or if it's mechanical and the turbo is out of its efficiency range beyond 7,000rpm?

M2C/M3/M4 have the same turbos.

[Tag]

ECU detune.

M3/4 s55
425 hp @ 5500-7300 RPM
406 ft-lbs @ 1850-5500 RPM

M2c s55
410 hp @ 5250–7000 RPM
406 ft-lbs @ 2350-5200 RPM

[Mavus]

Originally Posted by jayg80

Are there mechanical (intake, exhaust, engine) differences between the M2C and the M3/M4 that contributes to the 20 hp variance or is it just in the software tuning BMW wanted to create a little separation?

The drive shaft is different so the detune effects are not known yet until we get real world performance numbers aka power at the wheels. I am hoping the shaft is lighter than the steel shaft on m3/4

[Tag]

Originally Posted by Smooth 330i

The drive shaft is different so the detune effects are not known yet until we get real world performance numbers aka power at the wheels. I am hoping the shaft is lighter than the steel shaft on m3/4

It is lighter, it's a shorter car.

M4 wheelbase: 2,812mm
M2c wheelbase: 2,693mm

Difference of 119mm or 4.69"

[Mavus]

Originally Posted by Tag

It is lighter, it's a shorter car.

Hope that's the case but M2c is also shorter than m3 yet not that much lighter as far as we know. It depends on the material type and diameter.

[M-Pilot]

Originally Posted by Smooth 330i

Hope that's the case but M2 is also shorter than m3 yet not that much lighter as far as we know. It depends on the material type and diameter.

That's because M3/M4 has aluminum hood and fenders, CF roof, trunk, and driveshaft. Yes, I mentioned the CF driveshaft because the M3/M4 weight number that everyone is referring to is from the technical spec sheet that was released years ago when F80/82 first came out (with CF driveshaft). As usual, BMW never updated their specs or released any statement about how much more the 2018 M3/M4 weighs due to the steel driveshaft.

[Tag]

Originally Posted by Smooth 330i

Hope that's the case but M2c is also shorter than m3 yet not that much lighter as far as we know. It depends on the material type and diameter.

We're comparing rotational mass of a shorter drive shaft, not overall vehicle weight. It's a good thing in that regard.

[M3_WC]

Originally Posted by cntzl

That's because M3/M4 has aluminum hood and fenders, CF roof, trunk, and driveshaft. Yes, I mentioned the CF driveshaft because the M3/M4 weight number that everyone is referring to is from the technical spec sheet that was released years ago when F80/82 first came out (with CF driveshaft). As usual, BMW never updated their specs or released any statement about how much more the 2018 M3/M4 weighs due to the steel driveshaft.

Members are still receiving cars with CFRP driveshaft. Steel drive shaft is missing from etk. June 1st is cut off for particulate filter to be fitted to Euro M4's. Maybe have more info on steel drive shaft by then.

[MR.]

Mine will go on a really professional dyno as soon as it is driven in, so I can report on that to you guys

MR

[M-Pilot]

Originally Posted by M3_WC

Members are still receiving cars with CFRP driveshaft. Steel drive shaft is missing from etk. June 1st is cut off for particulate filter to be fitted to Euro M4's. Maybe have more info on steel drive shaft by then.

Read about that couple months ago but didn't know it was still happening. In any case, it'd be nice know the weight difference between CF and steel driveshafts. Also curious if this particulate filter deal applies to each and every model in the lineup including the limited edition models. BMW explicitly stated that M3 and M4 CS will continue to have CF driveshaft and I don't think they will stop M4 CS production after June 1st.

[Poochie]

I would wait 3 months or so until I'm sure the motor is not a dud before I thrown on a piggyback or tune.. If an engine does not show signs of any factory defects or built by then, then most likely it would run like a well oiled machine during its tenure, IMO. Warranty withstanding.

[GerardzM]

I'd be shocked if it were just a tune that makes the difference.

From the Mini World...2nd Gen.

And "S" and highest trim level "JCW" shared the same general engine, but slightly different hardware tweaks that always gave a higher ceiling for the JCW over an S.


If it really is as simple as a tune....absolutely stupid on BMWs part...great for the consumer!

Just pick up your cheaper M4.