Originally Posted by 545OH' post='848501' date='Apr 15 2009, 05:46 PM

Shocking someone upgrades a car? wow unfamothable.

Originally Posted by 545OH' post='848501' date='Apr 15 2009, 06:46 PM

You are so slow. Going to a lightweight larger wheel means you have a much lower profile and much lighter tire on it as well. You keep the same overall diameter or atleast you should be doing that so you cannot say a 15 inch wheel that weighs a ton is better than a 20 inch wheel that weighs a ton because the 15 inch wheel will have a huge high profile tire on it that weighs a ton and all that weight is around the periphery-the worst place for weight where as the 20 inch wheel has virtually no tire weight in comparison so it is lighter on the outside where that counts.

Shocking someone upgrades a car? wow unfamothable.

Originally Posted by ukr' post='849129' date='Apr 16 2009, 08:03 AM

Completely wrong, You are an idiot ! Admin: delete this douchebag!

Originally Posted by DRANGED' post='849451' date='Apr 16 2009, 11:54 AM

As of today he has been banned from this forum yet again.

Originally Posted by advancedlogic' post='849599' date='Apr 16 2009, 02:02 PM

I wonder who holds the record for multiple bannings here and in other domains? He has to be near the top 'o the class in that area...

Originally Posted by advancedlogic' post='849599' date='Apr 16 2009, 05:02 PM

I wonder who holds the record for multiple bannings here and in other domains? He has to be near the top 'o the class in that area...

Originally Posted by 545OH' post='802645' date='Feb 26 2009, 10:07 PM

I was wondering today how much rotating mass decrease equals x number of HP increase. Now as a lot of people think, this has nothing to do with the rotating mass being unsprung mass. (I am talking about light wheels/tires specifically although I know there is rotating mass in the engine/tranny as well.) A misconception is that reducing unsprung mass is much better than reducing sprung mass as far as improving acceleration and power-weight. It actually is only true that unsprung mass decrease increases and improves handling a TON but only a decrease in rotating mass such as wheels or tires can expotentially (not literally) increase acceleration out of proportion to the weight decrease. For example if you decrease the weight of your car by 50 pounds from taking the spare tire out, this will have a much less effect than if you decrease your wheel weight by 50 pounds.

I noticed this when I put new wheels and tires on that amounted to 44 pounds lighter for all 4 wheels w/ tires compared to stock. I noticed marked improvement in acceleration and speed as well as handling.

Now my question is, does anyone have a clue how to mathematically factor the increase in acceleration by knowing how much lighter the wheels/tires are? Also is it money better spent buying ultra light wheels/tires and saving up to 50-75 pounds of wheel rotating weight or spending that same money on horsepower improvements or upgrading a car to one with more HP. I am basically wondering how much lighter you need to make a car, specifically rotating weight to gain for example 100hp equivelents (just chose a number.)

I just think it is always cool to have the lightest car possible rather than a heavier one with more horsepower. I would love to continue shaving weight off my 545 and make it fast rather than buying an m5 for example. (just example.) It got me thinking with all the carbon fiber stuff available, you could pretty much replace every body panel and roof for about 6k and save a good 250 pounds or so. Then replace your wheels/tires and save 50 pounds or so. Just a thought.

Originally Posted by C's Bimmer' post='849608' date='Apr 16 2009, 05:14 PM

What was that 545OH? Huh? I can't hear you. Please repeat. Is something wrong with your voice? Oh wait, you've been banned. My bad.