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Old 03-14-2004, 10:39 AM
mbtoloczko's Avatar
mbtoloczko mbtoloczko is offline
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Join Date: Sep 2002
Location: Richland, WA
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effective mass of rotating car parts

Someone recently posted an Excel spreadsheet on NASIOC that estimates the effective mass of a tire/wheel combination due to rotational inertia. I had always wanted to do that, so I took a look at the spreadsheet. Turns out there was a rather bad assumption in the estimation. Anyhow, I fixed it up, and I have also converted the spreadsheet to estimate the effective mass of an engine flywheel. The spreadsheets are in my locker here:

<http://www.subaru-svx.net/photos/use...toloczko|15816>

To my surprise, messing with tire/wheel weights does not cause a huge change in effective mass of tire/wheel combos. However, going to a 13.5 lb flywheel (for those of you with 5MT swaps), can make a pretty big change in effective mass, at least in 1st gear.

For those of you without Excel, M$ has a free Excel viewer on their website. You can't change the spreadsheet, but you can at least look at the numbers already there.
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Mychailo
:: 2006 Silver Mitsubishi Evolution 9, E85, 34 psi peak, 425wtq/505whp DJ ::
1995 Laguna Blue SVX L AWD 5MT (sold)

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SVX Mods: ND iridium spark plugs, Impreza RS fpr, afr tuned to 13.2:1 using a custom MAF bypass, custom exhaust, WRX 5MT w/ STi RA 1st-4th gear & stock WRX 5th gear, Exedy 13 lb flywheel & Sport Clutch, STi Group N tranny & engine mounts, urethane spacers in rear subframe, rear diff mounts, and pitch stopper, SVX Sport Strut Springs (185f/150r), custom 19 mm rear swaybar, urethane swaybar mounts, Rota Torque 17x8", 225/45-17 Proxes 4 tires, Axxis Deluxe Plus organic brake pads.
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