Average RPM slippage on a conv

ken robinson · 03-26-2017, 02:58 PM

Whats the average rule of conv. slippage = in RPM +/- ? I'm trying to see what the top end RPM is with different rear gear ratio's .... RPM x tire dia. / by MPH X 336 = ring & pinion ratio . That formula dosen't account for conv. slippage , and is giving me the wrong gear ratios ....The car goes thru at 6750 x 28 tire / average 115 mph x 336 = 4:85 gear . But thats not true because it runs a 4:30 not a 4:85 . What would it go though with 4
:56 like 7150 rpm in average air ? My math / formula is wrong or I'm missing some thing .

03-26-2017, 02:58 PM	#1
ken robinson Member Join Date: Dec 2001 Location: tomsriver nj Posts: 479 Likes: 74 Liked 224 Times in 87 Posts	Average RPM slippage on a conv Whats the average rule of conv. slippage = in RPM +/- ? I'm trying to see what the top end RPM is with different rear gear ratio's .... RPM x tire dia. / by MPH X 336 = ring & pinion ratio . That formula dosen't account for conv. slippage , and is giving me the wrong gear ratios ....The car goes thru at 6750 x 28 tire / average 115 mph x 336 = 4:85 gear . But thats not true because it runs a 4:30 not a 4:85 . What would it go though with 4 :56 like 7150 rpm in average air ? My math / formula is wrong or I'm missing some thing .