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Discussion Starter #1
could some one tell me what rpm I will run at 60 mph with a 245/60/15 tires, m20 trans,

with 4.11 gears ?

with 3.73 gears ?

with 3.55 gears ?

trying to decide

thanks!
 

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3096 rpm with the 4.11 gears, 2810rpm with the 3.73 gears, and 2674 rpm with the 3.55 gears.

Your tire height should be 26.76'' roughly. Take 245 and divide by 25 to get your approximate section width in inches... = 9.8''. Multiply that by aspect ratio (.60) = 5.88''. Multiply this by 2 = 11.76, and then add rim diameter.. 15'' = 26.76''.

Formula for rpm at speed is ...

rpm = (rear gear ratio x final trans ratio x 336 x mph) all divided by tire height.
 

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However, all tire heights are not created equal! Measure yours to be accurate.

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Rick Dorion
69 RS Conv,355,M20,4.10's and I don't worry about stone chips.
 

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Discussion Starter #6
THANKS GUY'S !!!!

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camaro's for ever!!! :D
67 327 11:1 4spd.
70 454 400thm 10 posi
my 70 454 camaro
 

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Discussion Starter #7
THANKS GUY'S !!!!

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camaro's for ever!!! :D
67 327 11:1 4spd.
70 454 400thm 10 posi
my 70 454 camaro
 
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That site is pretty sweet!!!!

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<UL TYPE=SQUARE>
<LI>1979 Z-28, 350- Edelbrock Performer RPM Package- TH350
<LI>1970 Cadillac Hearse - 472 BB automatic 375hp
<LI>2000 Gmc Sonoma - 5-speed 4.10 rear
[/list]
 
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