2014 - [BMW] M3 & M4 [F80/F82/F83]

Would you agree that BMW M and Mercedes AMG and Audi Quattro RS cars are getting more similar – the move to turbos,
the increasing prevalence of all-wheel drive?

Well, turbo engines greatly cut fuel consumption and add torque, and you can’t do that with naturally aspirated engines.
But the M philosophy is to combine the best high-rev features with the torque of a turbo.
The M5 goes to 7400 rpm. I’m convinced that most race cars will have turbos.
And the new M3 will have one of the best engines we have ever done.


And all-wheel drive?

As to all-wheel drive, we use it on M Performance Automobiles [and the X5 M and X6 M] but it’s not necessary on M cars.
On the new M3 it would add 80 kg [176 pounds] and the steering would not be pure any more. It’s not worth it.
The car has 50:50 weight distribution and new traction management and a new differential, a development of the principle of the M5′s,
with torque vectoring, so it has excellent traction.


That’s twice you have called it the “new M3.” We were expecting M4.

Well the M3 is the icon, everybody is waiting for the fifth generation and I will bring one for absolutely certain, a sedan.
Yes the coupe and convertible will be called M4.


But the M4 coupe is first?

I think both M3 and M4 will be at the Detroit Show.


Each M3 has always had fewer cylinders than the M5 of the same era, right?

Yes.


Tell me about light weight. Is the new M4 lighter than a 435i?

Absolutely. We will use lightweight parts in the places where it matters, at the ends of the car and high up,
and in high-rpm parts of the powertrain.
A carbon fiber roof, of course, and aluminum and magnesium and carbon fiber in the crash zones.
An aluminum hood, and a new carbon fiber trunk lid.


If the trunk is a different part it can be a different shape for aerodynamics, like the E30 M3, yes?

Yes.


What about below the M3 and M4?

There’s no decision yet. But I absolutely want to develop a successor model to the 1 Series M Coupe.
I have all the components I need – the powertrain, chassis. In the near future you will know.
We can’t call it the M1, because that number is for the special mid-engined car, but there is M2, isn’t there?


What about a four-cylinder M car?

Not in the near future. But it’s possible. Our engines are modular.


But based off the new front-drive BMW platform? An M car to compete with the Mercedes A45 AMG?

What do you think of that car?


I think it understeers a lot on the road, and the powerband is too narrow – it’s laggy below 4000 rpm and demands
an upshift at just over 6000 rpm. And the shift paddles have far too much delay.

I had those troubles too. We drove it at the Nurburgring.


We’ve just been driving the 435i. How soon do you start planning an M version and making sure the base car
has the right technical qualities?

Very early. Look at the 5 Series. We had to make sure the body-in-white had enough stiffness,
and that there would be space under the hood for our V8 M engine.
But some of our parts are too expensive for the regular model, like our extra body stiffeners,
special steering system and carbon roof, so they are installed only in the M. And the design: we have the base model,
the Sport option, the M Sport, the M Performance automobile, and the full M model.
We have to make sure at the beginning that there will be enough differentiation between them.
Then we add our seats, our instruments, steering wheel, and so on.

Overall, 60 to 80 percent of the parts on an M-car are different from the regular model.


I was looking at the i3 recently and there’s obviously no scope for an M model there –
all the suspension parts are engineered right down to the minimum weight and strength for the grip generated by the skinny tires.

Absolutely. M and i are the two bookends at either end of BMW.


But isn’t there useful technology to you in those cars?

I have known [head of the i brand Uli] Krantz [head of i] for a long time.
The carbon fiber in the i8 and i3 is interesting for me. Reducing weight is interesting for both these bookend brands.
M engineers and i engineers work together. Some solutions in the i8 came from M.


Could M do a hybrid?

It’s not necessary. The i brand represents those cars for BMW. Sure, a lightweight lithium-ion battery is useful,
not for drive but for auxiliary functions and support systems. But there’s no M hybrid in the near future.
But if, say, China passed regulations that meant I couldn’t sell M cars there without hybrid, I would have to think about it.


And other powertrains?

That’s what M Performance [is] for. We do other body types, like estates, and we do diesel, and we do all-wheel drive.


Could you do an M Performance diesel AWD 4 Series, or even 3 Series Gran Turismo?

It’s possible. Anything we would call MPA would have to have a proper engine, worked on by M. We wouldn’t just do badges.