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Gear vs mph charts

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Old May 1, 2013 | 10:22 AM
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Default Gear vs mph charts
I will be changing my gears on my 06 auto z51 from 2.56 to 3.42. At present the rpm at 60 mph is about 1400 rpm and at 75 mph it's at 16 to 1700 rpm. Any idea as to what rims may be with the 3.42 gear change?
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Old May 1, 2013 | 11:06 AM
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I did the same thing to mine, 3.42 gears, A6. 70 mph = 2000 rpm. I haven't really paid attention to the other speeds.
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Old May 1, 2013 | 11:10 AM
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Originally Posted by Boombastic
I will be changing my gears on my 06 auto z51 from 2.56 to 3.42. At present the rpm at 60 mph is about 1400 rpm and at 75 mph it's at 16 to 1700 rpm. Any idea as to what rims may be with the 3.42 gear change?
where did u get your gear ?
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Old May 1, 2013 | 11:23 AM
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Dasilva Motorsports in Breslau near Kitchener. Ask for manny at 866 992 3752. I will be putting the gears in next week
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Old May 1, 2013 | 11:31 AM
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RPM has gears and if you get a diff side cover that will accept a cooler, they will cut the pinion to drive the pump.
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Old May 1, 2013 | 11:43 AM
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Originally Posted by timd38
RPM has gears and if you get a diff side cover that will accept a cooler, they will cut the pinion to drive the pump.
Huh. Did I miss something. How does this relate to my post. Thanks
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Old May 1, 2013 | 12:07 PM
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I have spreadsheets that can calculate that but have no idea how to post them. You can figure it out with a little data here...

http://www.wallaceracing.com/calcmph.php
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Old May 1, 2013 | 12:18 PM
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Or use this one if you want to determine speed for multiple gears
at various RPM.
Wayne

http://www.f-body.org/gears/
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Old May 1, 2013 | 12:53 PM
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Originally Posted by timd38
RPM has gears and if you get a diff side cover that will accept a cooler, they will cut the pinion to drive the pump.
RPM what? Is that suppose to be a vendor?
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Old May 1, 2013 | 02:03 PM
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It should be a linear change. To calculate the new rpm with only changing rear gears, multiply the rpm by (in your case) 3.42/2.56. I get your new rpm at 60mph to be 1400x3.42/2.56=1870 and at 75, 1650 goes to 2204.
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Old May 1, 2013 | 02:22 PM
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I have this but I don't know if it helps you.




Elmer
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Old May 1, 2013 | 08:49 PM
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Originally Posted by Boombastic
I will be changing my gears on my 06 auto z51 from 2.56 to 3.42. At present the rpm at 60 mph is about 1400 rpm and at 75 mph it's at 16 to 1700 rpm. Any idea as to what rims may be with the 3.42 gear change?
60 MPH = 1760 RPM

75 MPH = 2200 RPM

http://mysite.verizon.net/foofoo2/c6/A6-3.42.html
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Old May 1, 2013 | 10:16 PM
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Originally Posted by jpick
RPM what? Is that suppose to be a vendor?
Yes. http://m.rpmtransmissions.com/c6pricing.html
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Old May 1, 2013 | 10:48 PM
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Originally Posted by Gering
Thanks buddy!
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