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Old Jan 11, 2014 | 11:22 PM
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so im installing my new moser 9" (thanks brute speed) i need to decide on gear ratio. here's the specs

M6 running a 28" tall tire. I'm either going with 3.89 or 4.11's.

i did the online calculators
28" tire with 4.11's = 131mph@6500rpm
28" tire with 3.89's = 139mph@6500rpm

this is not my daily driver, i dont care about mpg's etc etc. i just want the best ratio for the 1/4 mile. the car made 407rwhp all motor, then ill spray 150 shot maybe a 175 shot at most. i dont want to take it past 6500 on stock rod bolts.
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Old Jan 11, 2014 | 11:33 PM
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If the 4.11's can support a 175 shot in the 1/4 i'd go that route personally. Unless you plan on other power upgrades in the future
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Old Jan 12, 2014 | 12:15 AM
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what would be an estimate of a 1/4 time @131 mph?
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Old Jan 12, 2014 | 08:30 AM
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407 to the wheels plus a 150-175 shot sounds like it should trap 130+

I would be trying to figure out which gear puts you at redline in 4th as you go through the traps
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Old Jan 12, 2014 | 10:53 AM
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The more power you make the less gear you need.
These are approximate.
6500 redline 4th gear 28" tire.
3.89 = 140 mph
4.11 = 132 mph
I would get either 3.70 or 3.89

Last edited by 2011grandsport; Jan 12, 2014 at 11:06 AM. Reason: add info
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Old Jan 12, 2014 | 01:35 PM
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right now i run 3.73's on a 275/45/17. i was leaning towards the 3.89. it would similar to the same gearing right now with a taller tire.
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Old Jan 14, 2014 | 07:57 AM
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Originally Posted by GiggleJuiced_SS
so im installing my new moser 9" (thanks brute speed) i need to decide on gear ratio. here's the specs

M6 running a 28" tall tire. I'm either going with 3.89 or 4.11's.

i did the online calculators
28" tire with 4.11's = 131mph@6500rpm
28" tire with 3.89's = 139mph@6500rpm

this is not my daily driver, i dont care about mpg's etc etc. i just want the best ratio for the 1/4 mile. the car made 407rwhp all motor, then ill spray 150 shot maybe a 175 shot at most. i dont want to take it past 6500 on stock rod bolts.
Thanks for the order! As has been mentioned, that shot of nitrous is going to make a big difference in your rpm so keep that in mind. Bob
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