What speed at redline in 4th with different gears
deciding which gear i want to go with
i suppose i'll run a 17" drag radial at the track once i get a stall and converter, seems like the 3600 stall is the way to go, but wondering which gear would be best as well 3.42, 3.73, or 3.90 if i'm going to stay at the power level i'm at now, i hit 120.46 in the heat with stock gears, whats going to put me going through the traps at the top of 4th, still in 3rd with the 2.56's with a little left |
You'll need to know the diameter of the tire to perform the calculation. You can always do a search for online MPH/RPM calculators.
Edit: Here's one for you. http://www.tciauto.com/Products/Tech...alculators.asp |
This one's my favorite. Pan down and select your car and trans type. Then you can change tire size or gear ratio or redline and see where you are at.
http://www.xse.com/leres/ss/calculator.html |
i wish the a6 had the .50 o/d as well
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Originally Posted by beefcake
(Post 1566562748)
i wish the a6 had the .50 o/d as well
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Originally Posted by glennhl
(Post 1566563211)
The A6 is a different animal. It has very short gears across the board. The A4 has a 1.0 third gear, the A6 has a 1.53 third. Also, it doesn't need the .5 od because it has a 2.56 final drive. Multiply the gear ratio in each gear by the final gear ratio to look at the whole picture.
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Originally Posted by beefcake
(Post 1566565430)
yes, but when you go to a 3.42, 3.73 or better, then that takes the gearset out of the equation
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Originally Posted by glennhl
(Post 1566572427)
Plus, when is the gearset ever out of the equation?
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Here's an interesting comparison...2 cars VERY similar mods except I've got 3.90 gears and he's got 3.42's. I've got .5 more compression but he's got a FAST.
Here's our dyno sheets overlaid based on RPM on the X-axis. Looks like the same car huh! http://i56.photobucket.com/albums/g1...Chadfast90.jpg But look here - I changed it to MPH on the X-axis, you can see the effect of gears. I have 24 more RWHP at 55 mph up to 47 more at 90 mph! That's why gears make the car feel so peppy. http://i56.photobucket.com/albums/g1...dfast90MPH.jpg |
Originally Posted by Joe_G
(Post 1566578859)
But look here - I changed it to MPH on the X-axis, you can see the effect of gears. I have 24 more RWHP at 55 mph up to 47 more at 90 mph! That's why gears make the car feel so peppy.
http://i56.photobucket.com/albums/g1...dfast90MPH.jpg But at 140 MPH, the 3.42 car has ~430 HP more than you.:yesnod: |
Originally Posted by glass slipper
(Post 1566634802)
But at 140 MPH, the 3.42 car has ~430 HP more than you.:yesnod:
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