I think your confusing unsprung weight and rotational mass. While rotational mass does also qualify as unsprung weight you won't see exponential acceleration gains by removing unsprung weight that isn't rotational mass. Rotational mass consists of Wheels, tires, rotors, axles etc. While unsprung weight includes those along with springs, shocks etc.

Reduction of unsprung weight can drastically improve handling, while reduction of rotational mass can drastically improve acceleration, as any weight reduction but rotational mass reduction has a much larger effect. There are tons of theories and formulas out there but the common/easy one I like to use (and have found it to be fairly accurate) is 6lbs of static weight = equivalent of 1rwhp. While 1.5lbs of Rotational mass = 1rwhp.

So in other words, if you remove your passenger seat which weighs ~60lbs. Your car would be quicker, and would theoretically accelerate as if you added 10rwhp to your car at full weight. You could also see the same effect by removing a total of 15lbs from your rotational mass (lighter wheels, tires, rotors etc.)

 

Yup your aboslutly right i got confused with the 2, you have any experience with an auto cross/ track day setup running all the same size tires on a coupe? I was looking at getting some RPF1s in 18s for my track wheels and not sure if i would want to do same size all around or keep it staggered. Also any thoughts on tires to run which are the lightest and have good grip?

 

I thought it was more like 10lbs of static weight = 1RHP and 1lb of rotational mass = 1RHP

 

 

Honestly, I understand a lot of the theory behind this stuff but i'm not a big autox/roadrace person (drag/roll racing FTMFW) so i'm not the one to ask since I haven't actually experimented with it. I do know that PS2s and PSSs are supposedly lighter than other performance tires of the same size, but those are still street tires, so it just depends how serious you are getting. And typically from what little I know, a square setup will be more balanced, while a staggered setup with tend to push/understeer a little more, which you will have to compensate for with suspension setup.

 

There's too much smartness going on right now.

 

 

LOL sorry V i just have a natrually inquisitive mind and i havent really had the chance to shoot the ish with someone in the industry till now with my ideas.

 

Psh, don't mind her. This makes my day go by quicker

 

Bleep bleep bleep

 

RYAN CHECK OUT THIS THREAD YOU MAY LIKE TO DISAGREE LOL
http://forums.350zclubofflorida.net/...ead.php?t=5878

 

I see that going downhill quick...

 

popcorn is popping

 

Thx for the link Eric. I couldn't help myself. Only because I spent FIVE HOURS of my life on the side of the road in GEORGIA because of their mistake(s).

 

Whats wrong with Georgia!?!!??!


I kid, Alabama FTW