[evo101]

This would have little to no effect on the car at all. It would act as hybrid weight.


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[evo101]

Care to explain?


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Evo 9 mr they gave a alum roof. Super high up weight reduction. Coming from a moto x back ground this is hybrid weight/ a tiny bit unsprung. Super low in the chassis which doesn't carry as much effect as if he shaved that 17lbs off the roof. Placebo effect. Your brain rationalizing $1500 down the pooper.


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[evo101]

The name of the game here is reducing moment of inertia which varies with the square of the radius to the point of mass. A drive shaft is relatively thin, meaning it has a very small radius and thus, has a relatively small moment of inertia already. Compare savings by lightening a flywheel which has a fairly large radius. Compare moment of inertia between large diameter rims & super low profile tires vs small diameter rims & tires thick sidewalls. Finally, compare $$$ spent paying credit card bills vs. $$$ gaining interest in the bank.

Point being? I get the whole point of it. So are you justifying this with interest in the bank for your cheap 4 door mitsu family cars not loosing as many revs between shifts.
I don't get the logic on this piece at all. I might as well get arp hardware for my drive shaft as well then...


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[evo101]

...Meaning the moment of inertia of a drive shaft is already low, so there isn't a whole lot left on the table in terms of gain. Perhaps consider spending your sheckels on the cutest, shiniest, *lightest* rims you can get your hands on and make out in multiple ways.

So you're then agreeing with me. Perfect.


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[evo101]

not really. you're advocating aluminum roofs. that has nothing to do with moment of inertia wrt car's engine and drive train. it has its place, but not in this discussion.

Yes it does. The carbon fibre drive shafts serve two purposes. Mainly weight for extreme track cars who want to shed a few pounds and yes to bring the moment of inertia at the outer edges of the driveshaft down if you need me to draw you a vector diagram I can. Bottom line you achieve this with less weight. Also contributing to a lighter car as with a aluminum roof which is your highest point. Which the drive shFt is not. It's considered hybrid weight. Take a physics course or two.


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