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Old 03-24-2004, 05:45 PM   #16
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Originally posted by Brandon R
whats the difference between knowing the final ratio and the direct ratio? If he changes the pinion to a 30 and drops down to a 2.40 ratio does that mean it would do the same thing as calulating the final ratio? yes it will make everything the same thus no need to worry about final ratio unless you change the internal gears. Its much easier to tune the direct gear than worry about all the other stuff right? If you go through all that trouble i feel very sorry for you!!
You have to have a baseline. The final ratio is your base line and you can go up or down from there. If you print out a chart for your specific car you can see at a glance what your ratios are for a given spur/pinion combo.
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Old 03-25-2004, 04:27 AM   #17
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brandon u are wrong, final ratio lets u compare gear ratios between cars because it takes into consideration thier differant differential ratios.
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Old 03-25-2004, 04:36 AM   #18
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Even final drive ratio isn't that helpful at the track unless there are many people running the same car with the same diameter wheels, who know their transmission ratio. Use rollout as your benchmark (which is how far the wheel travels for each revolution of the motor).

Check www.arroyoc.com There is a link in the tools section that has a final drive/rollout/mph tool that is very useful.
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Old 03-25-2004, 02:11 PM   #19
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Old 03-25-2004, 02:12 PM   #20
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Old 03-25-2004, 02:13 PM   #21
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LOL HAHAHHA
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Old 03-25-2004, 02:22 PM   #22
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Old 03-25-2004, 02:49 PM   #23
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Quote:
Originally posted by Andrew_XXXs
Even final drive ratio isn't that helpful at the track unless there are many people running the same car with the same diameter wheels, who know their transmission ratio. Use rollout as your benchmark (which is how far the wheel travels for each revolution of the motor).

Check www.arroyoc.com There is a link in the tools section that has a final drive/rollout/mph tool that is very useful.

exactly...thats why there is no point in that calculation! The easy and very simple way to tune with gear ratio is the direct pinion to spur all you other guys have fun jackin around with your charts and calulators
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Old 03-25-2004, 03:11 PM   #24
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Quote:
Originally posted by Brandon R
exactly...thats why there is no point in that calculation! The easy and very simple way to tune with gear ratio is the direct pinion to spur all you other guys have fun jackin around with your charts and calulators
You're missing the point. Do you really think you're turning us on to something new here? Of course you tune the ratio with your pinion and spur but unless you know the final ratio you hope to achieve you're not doing much good. Why are you fighting this fact?
The chart can show you what your ratio will be with certain spur/pinion combos. You don't need a calculator. For example, some motors need to be run at certain final ratios for optimum performance... unless you know how to get this you'll be either under geared or fry the motor.
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Old 03-25-2004, 03:17 PM   #25
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Using final drive ratios is a simple way to tell someone your gearing for a specific motor. If someone asked me what I geared a D6 8x2 I wouldn't say 24/96, I'd say 8.7 so that it's relevant to every car out there.
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Old 03-25-2004, 07:58 PM   #26
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Quote:
Originally posted by Andrew_XXXs
Even final drive ratio isn't that helpful at the track unless there are many people running the same car with the same diameter wheels
rubbers are the same, so if u run rubber then your diamater doesnt change and FDR is very handy on sharing setup..
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Old 03-25-2004, 08:42 PM   #27
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Old 03-25-2004, 08:53 PM   #28
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If you want to be able to compare your cars gearing to anothers (a different car) then you need to talk final drive ratio (rollout is better). If you try to copy someone elses gearing you will have lots of fun on a tc3 which uses small spurs/pinions compared to something like a 414. Try to fit a 90t (48p) spur in your tc3!!!

If you want to be able to understand what someone is saying, learn to talk their language... its that simple.
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