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      02-24-2021, 01:59 PM   #45
Scorp!on
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Quote:
Originally Posted by SYT_Shadow View Post
In the end it's pretty irrelevant if the difference between one generation's regular 3 series to the M3's rigidity gap is larger or smaller. What matters the most when comparing dynamics between two M3 generations is how rigid they are vs each other.

The G8X M3 is, as expected, significantly more rigid than the F8X generation.
Yeah, I was just pointing that the F80 may be a lot more stiffer than the F30 and the difference between G20 and G80 is smaller.
Would explain the 15% gain from G80 to F80.

example:

G80 100%
F80 85%
G20 80%
F30 65%

Don't know the exact numbers and especially how on earth they calculate a stiffness factor but I think you get the point.
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      02-24-2021, 02:05 PM   #46
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Quote:
Originally Posted by Scorp!on View Post
Yeah, I was just pointing that the F80 may be a lot more stiffer than the F30 and the difference between G20 and G80 is smaller.
Would explain the 15% gain from G80 to F80.

example:

G80 100%
F80 85%
G20 80%
F30 65%

Don't know the exact numbers and especially how on earth they calculate a stiffness factor but I think you get the point.
No worries, I wasn't referring to you, it's just a general comment about the people who crap on every single aspect of the G8X.

I'm sure if we dug enough we'd find the rigidity numbers for the different generations. I'm glad they've continued making it more and more rigid. The days of the E46 are long behind M!

Last edited by SYT_Shadow; 02-24-2021 at 02:40 PM..
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      02-24-2021, 07:08 PM   #47
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Quote:
Originally Posted by Scorp!on View Post
Don't know the exact numbers and especially how on earth they calculate a stiffness factor but I think you get the point.
AFAIK they put the chassis on a rig that can twist it, and measure how much force it takes to twist it one degree. You usually see that number listed in N-m/deg, so Newton-meters per degree.

Nowadays this probably can be done on a computer though...

Last edited by PABrian; 02-24-2021 at 07:13 PM..
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      02-25-2021, 05:18 PM   #48
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Quote:
Originally Posted by Scorp!on View Post
Yeah, I was just pointing that the F80 may be a lot more stiffer than the F30 and the difference between G20 and G80 is smaller.
Would explain the 15% gain from G80 to F80.

example:

G80 100%
F80 85%
G20 80%
F30 65%

Don't know the exact numbers and especially how on earth they calculate a stiffness factor but I think you get the point.
We have the approximate torsional stiffness numbers for the F3X and F8X, so doing some math we get the following:

G8X 46,000 Nm/deg = 100%
G2X 28,125 Nm/deg = 61%
F8X 40,000 Nm/deg = 87%
F3X 22,500 Nm/deg = 49%

You are right, there is less incremental stiffness gain from G2X to G8X (+64%) than there is from F3X to F8X (+78%). But since the G8X is based on stiffer baseline it still ends up being stiffer than the F8X (which is to be expected since it is a larger car).
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Last edited by CanAutM3; 03-17-2021 at 10:49 AM..
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