# My '08 STS-V

**URL:** https://forums.speedlife.net/t/my-08-sts-v/263024
**Category:** Builds
**Created:** [March 15, 2012, 3:59pm UTC](https://forums.speedlife.net/t/my-08-sts-v/263024 "2012-03-15T15:59:27Z")
**Posts on this page:** 1
**Showing post:** 97

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### Author: ![Skidplate](https://avatars.discourse-cdn.com/v4/letter/s/c2a13f/32.png) [@Skidplate](https://forums.speedlife.net/u/Skidplate)
#### Post date: [April 21, 2012, 6:31pm UTC](https://forums.speedlife.net/t/my-08-sts-v/263024/97 "2012-04-21T18:31:33Z")

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> [@My b-day present from my wife... Richard Petty Driving Experience!!](https://forums.speedlife.net/t/my-b-day-present-from-my-wife-richard-petty-driving-experience/49250/11):
>
> Where underboosted is going with flywheel weight is applied torque to the drivetrain and then the wheels.
> 
> IE 4.0 spinning a 30 vs 21 lb wheel will have more torque to apply to the driveline when you let the clutch out, due to the additional energy created by spinning the heavier mass. The other side of the coin is the engine has to produce more energy to spin the heavier wheel. Optimal flywheel weight really depends on vehicle intended use and complete drivetrain setup.
> 
> Also skid the caddy should have an aluminum DS from GM. They use aluminum on all the DS and torque tubes for reduced rotating mass. However it’s done to improve highway fuel economy 0.01 or w.e. MPG. In the real world aluminum vs. steel no real difference on quarter mile performance in a 13 sec 6k pound car. It’s like the difference of a spare tire in the trunk or not.

see that’s the answer i was after. ~10lbs off of 3 tons isnt gonna make a difference

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