View Single Post
      05-13-2014, 01:36 PM   #312
ybbiz34
Brigadier General
ybbiz34's Avatar
434
Rep
4,958
Posts

Drives: 2013 C63 AMG Sedan
Join Date: Jul 2007
Location: USA

iTrader: (1)

Quote:
Originally Posted by swamp2 View Post
I disagree. In cars of this power to weight ratio, in straight ahead acceleration, I can feel the difference between passenger or no passenger (say 150-200 lb). That is on the order of 5%. My butt-o-meter is far from finely honed from years of road racing, but has gotten a decent work out on dirt bikes (rear wheel basically spinning all the time), snow machines, some off-roading in trucks, etc. For me I'm pretty sure I could't consistently identify 75 lb or so of difference. I think very experienced HPDE guys and certainly racers could probably identify consistently around 75 lb, but 25-50, doubt. Definitely no solid evidence/proof here, but reasonable numbers I believe.
I believe you. And that's impressive.

I have a friend that races professionally and when discussing the importance of weight loss in road cars I asked him if he could notice a 175-lb weight loss. He covered the differences between sprung and unsprung weight but ultimately said he couldn't feel the difference between a passenger and no passenger.

I used to race dirt bikes (back in the good old days of 2-stroke motors) as well but they're so much lighter that proportionally, 75 lbs of extra weight there is an entirely different story.

I honestly can't feel the difference between passenger and no-passenger either. Especially on the street. Like I said before, I'm sure (I'm certain) the numbers tell a different story.

But being able to really feel a tenth of a second worth of difference is truly impressive.
__________________
'13 Iridium Silver C63 AMG Sedan (540 hp; 500 lb-ft)
Review of F82 M4: http://f80.bimmerpost.com/forums/sho....php?t=1008143