Quote Originally Posted by Pure Stock View Post
225/25.4=8.8582677" (section width) X aspect ratio .50 = 4.4291339 X 2 (two sidewalls) + 16" rim = 23.858268

2.73 x 336 x 160 mph = 146764.8 / 24.858268 = rpm 5,904.0638

Disclaimer: Due to manufacturing tolerences ( tire heights) this figure can only be a guess in a sense. Knowing the actual height of the tire per manufacturer will yield more accurate results.
where does the 336 come from in this? Its probably obvious, but i'm not seeing it right now?

My calculation for speed at 6000 rpms, on a 225/50/16 tire, with a 4th gear ratio of 1.00:1 (this is what the net said for the T5 tranny )

225 * .5 = 112.5 / 25.4 = 4.429
4.429 + 8 = 12.429 = r
Circumference = distance traveled by each ratation of tire = 2 * pi * r = 2 * 3.14159265 * 12.429 = 78.094" / 12 = 6.508'

1 * 2.73 = 2.73
6000 / 2.73 = 2197.8022 * 6.508 = 14303.2967 * 60 = 858197.8022 / 5280 = 162.5375 (different from what posted earlier b/c i rounded differently earlier)

piece of cake... Ray was right ... eat that doubters...