shaunv74

More fly less wheel!!

shaunv74

Also keep in mind the Mazdaspeed wheel is Steel and the RB wheel is aluminum 1 in^3 of Aluminum alloy is 0.0975lbs while 1 in^3 of alloy steel is 0.284 which is 2.9 times heavier than aluminum. The aluminum wheel will probably have the same mass at that radius even without the holes.

Check out the cool conversion link...
http://www.allmeasures.com/Formulae/...31/density.htm

Magic8

You guys are making it harder to resist the urge to change out the flywheel. Glad to hear the results are good.

On a side note, the 3D CAD package (IDEAS) I use at work calculated the moment of inertias (along with the mass) if you input the density. I wonder why they don't just give that number

BaronVonBigmeat

^^^ Yeah. I mean as long as they're (I assume) designing all this using a 3D CAD system, why don't they just release the calculated moment of inertia?

Actually come to think of it...that wouldn't be a bad idea for wheels either.

MrWigggles

I don't think chromalloy is nearly as heavy as steel. I think it is a little more dense than Aluminum and a lot less dense than steel.

Your point is taken but I do believe the reduction over stock in moment of the Mazdaspeed is more than the 55% reduction that RB claims. Could be wrong.

I think the holes whistle a little at high RPMs so I don't know if they are all good.

-Mr. Wigggles

shaunv74

um...chromalloy is a steel. Chrome vinadium alloy steel.

cortc

A little lighter but stronger... Actually the best material for flywheels is chromoloy, and they take more punishment then aluminum... Most aluminum flywheels have a chromoly tooth ring and a chromoly clutch friction surface etc...

MrWigggles

Chromoly is an alloy and after a lot of searching I did finally come up with the components.

It is 95% iron which means it should be about the same density as steel. It is funny because the flywheel didn't feel as heavy as if it had been made out of steel.

So that leaves us with Mazdaspeed flywheel and the RB flywheel probably having very similar reductions in intertial losses. The Mazdaspeed weighs a little less (maybe a pound by cortc's more accurate measurements), Racing Beat uses alluminum on the outer edge. while Mazdaspeed drills holes in there wheel.

Should be very similar.

-Mr. Wigggles

shaunv74

Probably. I bought the RB because it was cheaper than MS and I liked the design. I've seen some Al flywheels with Aluminum teeth and THAT I did not trust. the nice thing about the MS is you won't get boned by the dealer if your clutch goes out...

shaunv74

Hey all,

I know it's been a while but Polak and I finally got together and did a baseline of his unmodified RX-8 against mine with the RB flywheel. Here is the Gtech comparison. I'd say it's a solid comparison as the power curve matches very well until you start to see the effects of the flywheel become more pronounced. The weights when tested are different because of the difference in gas, both of us being in the car, him having a pile of his shirts and crap in the back and his nav. system.

Enjoy...

Ajax

I'd like to see curves like that for all of the flywheels... the 2 SRs, the MS, the RB and whoever else is making one.. They're all kinda different in weight with the SR 9.5 being the lightest... I'm looking to do about 2000-2500 in mods in the next 6 months and the flywheel is on the list. I figure that, a full suspension and maybe the clutch should make a marvelous difference in the car....