[A_]

This confirms that, with the specific configuration, the M8 Coupé can weigh less than the M6 F13, despite having AWD. In addition, the automatic transmission weighs less than the DKG transmission in the M6.

[M6-Coupe]

Originally Posted by A_

This confirms that, with the specific configuration, the M8 Coupé can weigh less than the M6 F13, despite having AWD. In addition, the automatic transmission weighs less than the DKG transmission in the M6.

I love the way you Europeans call DKG ( which is German word) instead of DCT 😊
I’m also surprised if M8 is lighter than M6 despite AWD but I think the US version of M8 is 45 lb heavier than US version of M6 (4295 vs 4250) as advertised.
Car & Driver reported both cars 4250 lb however the M8 one tested by Car & Driver had CCB so saved 50 lb.

[c1pher]

I’d rather keep the rear steering.

[komalol]

Originally Posted by M6-Coupe

I love the way you Europeans call DKG ( which is German word) instead of DCT 😊
I’m also surprised if M8 is lighter than M6 despite AWD but I think the US version of M8 is 45 lb heavier than US version of M6 (4295 vs 4250) as advertised.
Car & Driver reported both cars 4250 lb however the M8 one tested by Car & Driver had CCB so saved 50 lb.

In terms of weight, the difference between the M6C and M8C (lightest configuration possible) is very small (max 20lbs). This is negligeable considering the power. The M6C has a slightly better drag coefficient, but this mainly matters for speeds >100mph. However, the 8-speed ZF in the M8C is a real improvement compared to the 7-speed DKG!
I read in an article that the improved acceleration of -1.1s (100-200 km/h) is due to :
-ZF transmission : -0.9s
-power increase (+25hp) : -0.2s

[M6-Coupe]

Originally Posted by komalol

In terms of weight, the difference between the M6C and M8C (lightest configuration possible) is very small (max 20lbs). This is negligeable considering the power. The M6C has a slightly better drag coefficient, but this mainly matters for speeds >100mph. However, the 8-speed ZF in the M8C is a real improvement compared to the 7-speed DKG!
I read in an article that the improved acceleration of -1.1s (100-200 km/h) is due to :
-ZF transmission : -0.9s
-power increase (+25hp) : -0.2s

Well I dont think ZF has that much effects and I don’t think M8 is 1.1 seconds quicker than M6 either.
As far as power, M6 competition was rated to 575 hp while M8 competition is rated to 617 hp ( although both are underrated) so it’s more than 25 hp.
I think torque is more important here. M6 was rated to 502 lb-ft while M8 is rated to 553 lb-ft.
BTW I love BMW M DCT gearbox over ZF.
It was jurky (at first and second gears) but had real manual feeling. No creepy feeling and no going forward on uphill. It also had faster response on gear changing.
I think the advantage of ZF over DCT is fuel saving and shorter gear ratios at lower gears transfering more torque to wheels.

P.S : F06/F12/F13 M6 had 3 different versions.
1 Base model (non competition) - 560 Hp , 502 lb-ft (680 NM)
2 Competition model (I) 2013 and 2014 model year - 575 hp, 502 lb-ft (680 NM)
3 Competition model (II) 2015 and later model year - 592 hp , 516 lb-ft (700 NM)

[komalol]

Originally Posted by M6-Coupe

Well I dont think ZF has that much effects and I don’t think M8 is 1.1 seconds quicker than M6 either.
As far as power, M6 competition was rated to 575 hp while M8 competition is rated to 617 hp ( although both are underrated) so it’s more than 25 hp.
I think torque is more important here. M6 was rated to 502 lb-ft while M8 is rated to 553 lb-ft.
BTW I love BMW M DCT gearbox over ZF.
It was jurky (at first and second gears) but had real manual feeling. No creepy feeling and no going forward on uphill. It also had faster response on gear changing.
I think the advantage of ZF over DCT is fuel saving and shorter gear ratios at lower gears transfering more torque to wheels.

There are pro's and con's for both the DKG and ZF, but you're right that the DKG gives you more of a manual transmission feeling than the ZF.
The 100-200kmh figures come from BMW technical data sheets.

BMW M6 Coupe Competition (from 09/2015) : 592hp(600PS) ; 700NM ; 8.5s 100-200kmh

BMW M8 Coupe Competition (from 03/2021): 617hp(625PS) ; 750NM ; 7.4s 100-200kmh

Of course, the torque curve also plays a role in these figures, that's for sure. The mentioned article based its figures on the fact that the difference between the M5 (600PS-750NM) and M5C (625PS-750NM) is 0.2s (100-200kmh). Their assumptions may have been flawed.

[M6-Coupe]

Originally Posted by komalol

There are pro's and con's for both the DKG and ZF, but you're right that the DKG gives you more of a manual transmission feeling than the ZF.
The 100-200kmh figures come from BMW technical data sheets.

BMW M6 Coupe Competition (from 09/2015) : 592hp(600PS) ; 700NM ; 8.5s 100-200kmh

BMW M8 Coupe Competition (from 03/2021): 617hp(625PS) ; 750NM ; 7.4s 100-200kmh

Of course, the torque curve also plays a role in these figures, that's for sure. The mentioned article based its figures on the fact that the difference between the M5 (600PS-750NM) and M5C (625PS-750NM) is 0.2s (100-200kmh). Their assumptions may have been flawed.

My friend I don't know how reliable those numbers are but I had M6 (non competition) , M8 (non competition) and have M8 Competition.
There is no that much (1.1 second) difference in term of 100-200 km/h.

Per fastest lap website:

M6 0-100 km/h :3.9 seconds
M6 0-200 km/h: 11.6 seconds
So 100-200 km/h : 7.7 seconds
https://fastestlaps.com/models/bmw-m6-competition

M8 0-100 km/h: 2.8 seconds
M8 0-200 kn/h: 10 seconds
So 100-200 km/h: 7.2 seconds
https://fastestlaps.com/models/bmw-m8-competition

I believe A_ has real numbers to share.

[A_]

Originally Posted by M6-Coupe

I love the way you Europeans call DKG ( which is German word) instead of DCT ��
I’m also surprised if M8 is lighter than M6 despite AWD but I think the US version of M8 is 45 lb heavier than US version of M6 (4295 vs 4250) as advertised.
Car & Driver reported both cars 4250 lb however the M8 one tested by Car & Driver had CCB so saved 50 lb.

Maybe I exaggerated a little, but not entirely. If the M5 CS has carbon bucket seats and Harman Kardon Audio (the same as in my M8), which together weigh 35 lb less, giving a total of 4,260 lb, about 10 lb more than the M6, but if you add an Akrapovic rear silencer, it will be 4,250 lb, the same as the M6 after all.

I once posted the weight measurement of the M8 Coupé with ceramic brakes, and it is around 1885 kg, but if we subtract the carbon bucket seats and Harman Kardon Audio, which is about 15.8 kg less, the total is 1869 kg. You can also add an Akrapovic titanium exhaust, which will reduce the weight by a few more kilograms, and it turns out that the M8 is not that heavy after all. It's close to the M5 CS, and definitely much lighter than 2435 kg of M5 G90. The difference is 566 kg, over half a ton.

[A_]

Originally Posted by M6-Coupe

My friend I don't know how reliable those numbers are but I had M6 (non competition) , M8 (non competition) and have M8 Competition.
There is no that much (1.1 second) difference in term of 100-200 km/h.

Per fastest lap website:

M6 0-100 km/h :3.9 seconds
M6 0-200 km/h: 11.6 seconds
So 100-200 km/h : 7.7 seconds
https://fastestlaps.com/models/bmw-m6-competition

M8 0-100 km/h: 2.8 seconds
M8 0-200 kn/h: 10 seconds
So 100-200 km/h: 7.2 seconds
https://fastestlaps.com/models/bmw-m8-competition

I believe A_ has real numbers to share.

I have mentioned a few times that the M6 performs differently depending on the emission standard. With EURO5, it achieved 11.2 seconds in the German 0-200 test. I am talking about the M6 575ps version, because the M6 600ps EURO6 version was already slower, achieving 11.7 seconds.

[A_]

Originally Posted by komalol

In terms of weight, the difference between the M6C and M8C (lightest configuration possible) is very small (max 20lbs). This is negligeable considering the power. The M6C has a slightly better drag coefficient, but this mainly matters for speeds >100mph. However, the 8-speed ZF in the M8C is a real improvement compared to the 7-speed DKG!
I read in an article that the improved acceleration of -1.1s (100-200 km/h) is due to :
-ZF transmission : -0.9s
-power increase (+25hp) : -0.2s

It can be said that the M8 is much faster than the M6 because it has high repeatability of performance from the roll race. There are no traction problems like with the M6. And the race from a standing start is a huge difference.
In the M8, I had such good 100-200km/h results that I was unable to achieve in the stock M6, even in the EURO5 specification.

[M6-Coupe]

Originally Posted by A_

I have mentioned a few times that the M6 performs differently depending on the emission standard. With EURO5, it achieved 11.2 seconds in the German 0-200 test. I am talking about the M6 575ps version, because the M6 600ps EURO6 version was already slower, achieving 11.7 seconds.

Can you share your 100-200 with your M6 (575 hp?) and M8?

[M6-Coupe]

Originally Posted by A_

Maybe I exaggerated a little, but not entirely. If the M5 CS has carbon bucket seats and Harman Kardon Audio (the same as in my M8), which together weigh 35 lb less, giving a total of 4,260 lb, about 10 lb more than the M6, but if you add an Akrapovic rear silencer, it will be 4,250 lb, the same as the M6 after all.

Not sure if I understood correctly.
First of all M5 CS weight is measured 4096 lb (1860 lb) by C&D.
Second M8 was measured by C&D as 4251 lb with respect to CCB.
And I don't know the relation between these numbers and M8 weight as mentioned 4295 lb at BMWUSA website.
But what I know is the one measured by C&D was a fully loaded at ~175k so I expect even single box was checked.

[komalol]

Originally Posted by M6-Coupe

My friend I don't know how reliable those numbers are but I had M6 (non competition) , M8 (non competition) and have M8 Competition.
There is no that much (1.1 second) difference in term of 100-200 km/h.

Per fastest lap website:

M6 0-100 km/h :3.9 seconds
M6 0-200 km/h: 11.6 seconds
So 100-200 km/h : 7.7 seconds
https://fastestlaps.com/models/bmw-m6-competition

M8 0-100 km/h: 2.8 seconds
M8 0-200 kn/h: 10 seconds
So 100-200 km/h: 7.2 seconds
https://fastestlaps.com/models/bmw-m8-competition

I believe A_ has real numbers to share.

You know, official EU acceleration times may be quite different from real test values. I have about 12 different articles about the M8C Coupe and 100-200kmh go from 6.8 to 7.5 depending on weather, tires, surface etc. For standing accelerations, the gap even gets bigger....
My own M8C does a best 7.1s from 100-200kmh (temperatures <15° Celsius). Times go up to 7.5s above 25° Celsius. These are slope corrected times.

[A_]

Originally Posted by M6-Coupe

Can you share your 100-200 with your M6 (575 hp?) and M8?

Repeatable 100-200 km/h at a temperature of +8+10 degrees Celsius:
M6 F13 575ps Euro5 - 6.6-6.7s
M6 F13 600ps Euro6 - 7.1-7.2s
M8 F92 625ps Euro6d - 6.3-6.4s

[A_]

Originally Posted by M6-Coupe

Not sure if I understood correctly.
First of all M5 CS weight is measured 4096 lb (1860 lb) by C&D.
Second M8 was measured by C&D as 4251 lb with respect to CCB.
And I don't know the relation between these numbers and M8 weight as mentioned 4295 lb at BMWUSA website.
But what I know is the one measured by C&D was a fully loaded at ~175k so I expect even single box was checked.

Did C&D measure the M8 equipped with carbon bucket seats and Harman Kardon audio?
What I gave above is the weight of the M8 Coupé with CCB, Comfort Seats and B&W, approximately 1885 kg, which is 4155 lb (without driver).

[komalol]

Originally Posted by A_

Repeatable 100-200 km/h at a temperature of +8+10 degrees Celsius:
M6 F13 575ps Euro5 - 6.6-6.7s
M6 F13 600ps Euro6 - 7.1-7.2s
M8 F92 625ps Euro6d - 6.3-6.4s

If these times are achieved without any mods on the cars, I would be curious to know what their power output is on a dyno. No way these cars have the "official" hp

[A_]

Originally Posted by komalol

You know, official EU acceleration times may be quite different from real test values. I have about 12 different articles about the M8C Coupe and 100-200kmh go from 6.8 to 7.5 depending on weather, tires, surface etc. For standing accelerations, the gap even gets bigger....
My own M8C does a best 7.1s from 100-200kmh (temperatures <15° Celsius). Times go up to 7.5s above 25° Celsius. These are slope corrected times.

I don't fully trust the fastenlaps website because the measurements are mixed up and there are mistakes.
At a temperature of 24 degrees Celsius, I did 6.9-7.0 with the correct slope. Anyway, my measurements always have the correct slope. Why would I cheat myself?
At lower temperatures, cars drive faster, hence the possibility of achieving better 100-200

[A_]

Originally Posted by komalol

If these times are achieved without any mods on the cars, I would be curious to know what their power output is on a dyno. No way these cars have the "official" hp

In order for my M6 F13 600ps Euro6 to drive similarly to a 575ps Euro5, I had to install a piggyback. The original 600ps software was ruined by the manufacturer. At 160km/h, I felt that the car slowed down for a moment at 170km/h and then started to accelerate again. All because of the Euro6 emissions standard.

[komalol]

Originally Posted by A_

I don't fully trust the fastenlaps website because the measurements are mixed up and there are mistakes.
At a temperature of 24 degrees Celsius, I did 6.9-7.0 with the correct slope. Anyway, my measurements always have the correct slope. Why would I cheat myself?
At lower temperatures, cars drive faster, hence the possibility of achieving better 100-200

Well consider yourself lucky if your car power output scatters upwards

[A_]

Originally Posted by komalol

If these times are achieved without any mods on the cars, I would be curious to know what their power output is on a dyno. No way these cars have the "official" hp

I think it will be around 700 hp for the M8. Without any piggybacks. I saw a few measurements on the M8/M5CS dynamometer and it showed around 700 horsepower.

Originally Posted by komalol

Well consider yourself lucky if your car power output scatters upwards

I haven't always been lucky. Imagine how I felt when I sold my M6 575ps and ordered a new M6 600ps Euro6, thinking it would be faster than the older model. BMW deceived me. I had to fix it myself by installing a piggyback. Fortunately, the M8 drives fast.
The M6 575ps must have had similar software to the press M6 from the German test https://www.6post.com/forums/showthread.php?t=911274. And my M8 drives comparably to the M5 CS, which can do 100-200km/h in 6.4s at lower temperatures.

[komalol]

Originally Posted by A_

I think it will be around 700 hp for the M8. Without any piggybacks. I saw a few measurements on the M8/M5CS dynamometer and it showed around 700 horsepower.



I haven't always been lucky. Imagine how I felt when I sold my M6 575ps and ordered a new M6 600ps Euro6, thinking it would be faster than the older model. BMW deceived me. I had to fix it myself by installing a piggyback. Fortunately, the M8 drives fast.
The M6 575ps must have had similar software to the press M6 from the German test https://www.6post.com/forums/showthread.php?t=911274. And my M8 drives comparably to the M5 CS, which can do 100-200km/h in 6.4s at lower temperatures.

For my M8 to get these times, I would need a Stage1 Tune
I wonder what times your M8 would get with a tune!!

[M6-Coupe]

Originally Posted by A_

Did C&D measure the M8 equipped with carbon bucket seats and Harman Kardon audio?
What I gave above is the weight of the M8 Coupé with CCB, Comfort Seats and B&W, approximately 1885 kg, which is 4155 lb (without driver).

As I said the one C&D measured, is a fully loaded including CCB except bucket seat because car was 2020 model and I believe bucket seat was not option at that time.
So if you subtract the saving on bucket seat ( which is claimed 22 lb earlier in this forum) from 4251 lb you can find the weight as 4229 lbs..
Having said that I believe what BMWUSA claims for NA as 4295 lb is the weight of fully loaded M8 without CCB and bucket seat.
Not sure what BMW saves for European version.