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Re: It does not have a de-tuned chassis... (m) (archive)

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Posted by Jeffrey Leisey on November 18, 2000 at 02:13:02:

In Reply to: Re: It does not have a de-tuned chassis... (m) posted by Paul on November 17, 2000 at 19:32:26:

As a former a E36 M3 owner and current E39 M5, I know a little about this subject. The brakes on the E36 were essentially the same except for the rotors. Guess what, I purchased the Euro rotors and put them on, problem solved. As far as the difference between the US and Euro spec E46, there isn't a MF on this board that could drive either one to its potential, so the 1/2% percent differnce between the two is irrelevant. Detuned chassis, my ass. And no, I am not saying I can drive the car to its potential. I spent too many days at drivers schools learning that I better not quit my day job. BTW, my M5 brakes work awesome on the street and fair on the track. They do get a little worked on the track, but that is a function of the street pads. 400HP + 4000lbs = a lot of work for the brakes but no warpage.

The floating rotors may or may not be an issue.

There are a couple of indicators. #1, the US M5 does not get them. #2:

Roundel November 2000 M3 article states "Brakes, of course, are beefy -- they have to be, with the speed potential -- 12.80" front vented rotors, 12.88 at the rear".

Now compare that to what says about euro spec brakes: "To safely master their staggering power and performance, BMW's M models come with a particularly large and efficient high-performance brake system featuring compound brake discs (M5 and M3 compound brake discs all round, M coupé and M roadster compound brake discs at the front). The big difference versus conventional brake discs is that compound brake discs come with a radial anti-friction bearing for the brake disc ring. This floating system allows free thermal expansion of the brake disc rings, thus providing the option to use different materials with the best properties in each case for specific purposes. This, in turn, means that each component within the brake system is able to do a perfect job according to its specific requirements. The result is not only outstanding stopping power, but also a considerable reduction in weight versus conventional brake systems, a significantly higher standard of driving comfort, and a much longer service life."

Regardless, I wouldn't constute brake and engine differences as a "detuned chassis compared to euro spec" as you said. Brakes and engine != chassis, in my book.

Check out the below link regarding the interplay of the BMW chassis. It is written by the head of chassis development at BMW M. The chassis guys exert precision all the all the way to the seats and steering wheel. So when the US takes braking power away, I think it is reasonable to characterize the chassis as detuned.

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