Anyone have a speed calculator?
TECH Addict
Joined: Nov 2001
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From: College Station, Tx
TECH Addict
Joined: Nov 2001
Posts: 2,556
Likes: 0
From: Nawf Carolina
Re: Anyone have a speed calculator? It has 98 Fbody A4. Then you have to manually put in your rear axle ratio.
153 mph is what the calc says. I think the stock speedo is off at high speeds, just like the stock tach and water temp is often off. I was autotapping one day on a road I use a lot, so I know about how fast I can get to from different starting speeds. I wasn't paying much attention to the speed much but it sure didn't seem like I was going over 100, according to autotap I was.
J.
153 mph is what the calc says. I think the stock speedo is off at high speeds, just like the stock tach and water temp is often off. I was autotapping one day on a road I use a lot, so I know about how fast I can get to from different starting speeds. I wasn't paying much attention to the speed much but it sure didn't seem like I was going over 100, according to autotap I was.
J.
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Joined: Nov 2001
Posts: 678
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From: Kemah, TX
Re: Anyone have a speed calculator? Josh, maybe this will help. I will see you tomorrow with the cutout plate.
Les
Ratio formula
(rpm x 25.66 (diameter for RSA's))=X
(mph x 336 ) = Y
X / Y = ratio (Note this is your final dive ratio! 1 to 1) 140 = 5000
ratio * 1.3 = (1.3 = .70 overdrive)
My car: In O/D = 275 rpm’s for every 10 mph with 2.73 gears.
60 = 1650
70 = 1925
73 = 2000
80 = 2200
90 = 2475
100 = 2750
110 = 3025
120 = 3300
130 = 3575
140 = 3850
Les
Ratio formula
(rpm x 25.66 (diameter for RSA's))=X
(mph x 336 ) = Y
X / Y = ratio (Note this is your final dive ratio! 1 to 1) 140 = 5000
ratio * 1.3 = (1.3 = .70 overdrive)
My car: In O/D = 275 rpm’s for every 10 mph with 2.73 gears.
60 = 1650
70 = 1925
73 = 2000
80 = 2200
90 = 2475
100 = 2750
110 = 3025
120 = 3300
130 = 3575
140 = 3850
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