DTM DTM and Touring Racing Discussion Thread

[dalab]

Can you tell me anything about where the engine of an M4 GT3 sits in comparison to a normal M4?

My gut feeling is that the engine mounting position itself will be largely the same.

According to what i saw in a bmwblog video from a couple of days ago, the engine goes much further back and much lower

 

[Matski]

According to what i saw in a bmwblog video from a couple of days ago, the engine goes much further back and much lower

I'd be curious about the specific text of that statement. Going further back by moving to a transaxle is a possibility I'd imagine - though even then, the firewall/bulkhead is fixed and you can't go much further back even in road cars. Going lower... maybe... the height of the crank can't change that much, though what's bolted on top of, and around the engine... who knows... this is something that comes up regularly with 320si owners... we believe our engines are lower, and further back... but few can describe if that's genuinely the case from a mounting point of view, or just that the engines CoG is lower and further back.

My point was though, it's not going to be your biggest problem, by a long shot.

This video is well out of date now... but this is what goes into building a customer racing car from a body shell already supplied for conversion to GT3

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You wouldn't do it from a road car for any other reason than clicks.

 

[dalab]

I'd be curious about the specific text of that statement. Going further back by moving to a transaxle is a possibility I'd imagine -

Even the box is in the back via driveshaft and yes in the transaxle.
Here is an engineer from M, very explicit and illustrative about all those doubts, engine below, further back, why, etc etc.

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[klier]

I'd be curious about the specific text of that statement. Going further back by moving to a transaxle is a possibility I'd imagine - though even then, the firewall/bulkhead is fixed and you can't go much further back even in road cars.

Yeah I was thinking the same thing. Thanks for your replies man. This is going to be a near impossible job.

You wouldn't do it from a road car for any other reason than clicks.

No doubt about that.
The guy is ruining a new Individual M4 because of it. But it's still fascinating to see, and the bodykit itself is awe-inspiring.

 

[Matski]

Here is an engineer from M, very explicit and illustrative about all those doubts, engine below, further back, why, etc etc.

So it seems the engine is 20cm lower thanks to the dry sump replacing the road cars quite deep oil pan. The engine is more 'upright' in the race car (7° instead of 20°) and obviously the intake/exhaust arrangement is completely different. The other thing I didn't consider is the road car having to allow for the xDrive system, which I think runs through the oil pan. With this being the case I'm still not sure how much of the engine support legs are as per the road car.

But again, even if it was upside down and sideways, nothing else at the front of the car matches the road car.