Skylarking
Well-Known Member
- Joined
- Feb 3, 2018
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- Location
- Downunder
- Members Ride
- Commodore Motorsport Edition
Yes its a high moment of inertia issue. Heavy clutch, rims and tyres with much of the weight away from the rotational axis will impact how quick things can spin up. But, although a high moment of inertia will impact the transient power delivery, it does not change steady state (or instantaneous) power delivery.... If you watch any youtube videos about dyno tuning you will note that the ones that know there **** will mention the effect of rotating mass of the rear wheel effect on power output.
One example of an engine in which insane levels of design and build effort went into reducing parasitic loss, rotational mass (moment of inertia) and other power robbing issues that slow the engines transient responce was the Lexas LFA. It can spin up from idle to 9000 rpm in less than 1/2 second according to this megafactory video, see the 26:24 minute mark. I think that it's this engines ability to deliver such a high transient responce, when coupled with a light vehicle, that would make for a very responsive pedal on the road. It's a full on quick machine around the NB track.
What does this mean for our commodores? Well, buy a set of Aussie Carbon Revolution wheels (19"x8.5" at 7.8 kgs each) and a set of brembo light alloy hat floating disc brakes (at ? kgs each) can't hurt anything but the wallet F1 styled clutch, even more so