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Old 03-29-2007, 10:07 AM   #1
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Default Epic X-Stock vs Trinity co27

i have been running trinity co27s lately, but i am going to try a putnam x-stock this sunday in tc, just wondering how to gear the switch, the co27 never got hot with a 100/31 gearing in my tc3.
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Old 03-29-2007, 10:35 AM   #2
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Quote:
Originally Posted by Jake S
i have been running trinity co27s lately, but i am going to try a putnam x-stock this sunday in tc, just wondering how to gear the switch, the co27 never got hot with a 100/31 gearing in my tc3.
If it's the same amount of turns then leave the gearing alone, on that note Trinity and Epic are the same company... Take Care and Good Luck...
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Old 03-29-2007, 11:01 AM   #3
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I belive the X-Stock is an RPM motor. Drop down a few teath.

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Old 03-29-2007, 11:13 AM   #4
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Assuming 57mm tires, 100/31 on a tc3 is only 22.2 rollout, that's low for the CO27. Almost everyone locally is running around 26-27 with their co27's.
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Old 03-29-2007, 11:43 AM   #5
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Same amount of turns means nothing with gearing......that is horrible advice.

All motors make X power, but power is made up by RPM and Torque......each motor, even the exact same model can have differences enough to gear them differently.

We have had big races where guys with the handouts had to gear up to 4 teeth higher than others.....simply cause their motor differed in numbers from the next.

And X stock is the RPM motor that Trinity/Epic produces......typically, you would want to drop a couple of teeth to make up the lose in torque and utilize the additional RPM....

In the end, power is power.....once you figure how the power is being made, its just a matter of gearing....


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Old 03-29-2007, 12:05 PM   #6
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I would drop down to a few teeth to a 29 or 28 for the first run with the motor and then mess are with the gear based on that run. The x's have more rpm then the co27s.
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Old 03-29-2007, 12:44 PM   #7
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Quote:
Originally Posted by Jake S
i have been running trinity co27s lately, but i am going to try a putnam x-stock this sunday in tc, just wondering how to gear the switch, the co27 never got hot with a 100/31 gearing in my tc3.
Again, I see that people think I am giving bad advice which isn't the case, If your motor co27 never ran hot with the 100/31 gearing and you are switching to a motor that revs slightly higher then run the same gearing if at the most go down one tooth on the pinion, And that's if your motor even gets hot, Which more than probably it won't,but at the most it probably run about 3-6 degrees warmer which means nothing, and thats because it revs slightly harder. Anything that revs higher runs warmer. Thats common sense... I don't track race professionally but I have been running electrics since I was 7 years old and track raced locally as a kid and I am 30 years old I am not new to this game, I've been running my tc3's since 2001, I build electric drag cars, I worked for a hobby shop for 6 years as a R/C tech and sales. And on my spare time I built electric drag motors and rev motors. So I do know the science of a motor and how it works. I do know the higher the revs the less torque you have but when its in a small margin it really doesn't matter. Stock motors don't lack torque. Just monitor the temp if its a big cocern. If we was talking about low turn modified then I would say drop the pinion at least 3-4 teeth and base it on the kind of track you are running. Take Care and Good Luck...
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Old 03-29-2007, 01:52 PM   #8
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If my CO27 never ran hot I would throw more gear on it LOL
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Old 03-29-2007, 02:08 PM   #9
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Quote:
Originally Posted by Bob Barry
If my CO27 never ran hot I would throw more gear on it LOL
some people do.
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Old 03-29-2007, 02:10 PM   #10
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Quote:
Originally Posted by Bob Barry
If my CO27 never ran hot I would throw more gear on it LOL
I'm with you on that one.
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Old 03-29-2007, 02:45 PM   #11
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Quote:
Originally Posted by MikeXray
Assuming 57mm tires, 100/31 on a tc3 is only 22.2 rollout, that's low for the CO27. Almost everyone locally is running around 26-27 with their co27's.
I need to get my co27 rebuilt, and i want to try a putnam x-stock since everyone runs co27s and monsters, even a few xstocks too around here, i want to try something alittle different to see how it runs.
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Old 03-29-2007, 04:13 PM   #12
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I know its not quite the same but in my 1/12th I ran 45-47 roll out with a CO27,
same roll out with the x-stock was crap.
I had to drop down to a 40-41 roll out.
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Old 03-29-2007, 04:56 PM   #13
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Quote:
Originally Posted by clint
I know its not quite the same but in my 1/12th I ran 45-47 roll out with a CO27,
same roll out with the x-stock was crap.
I had to drop down to a 40-41 roll out.
how much did you have to change pinion and spur?
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Old 03-29-2007, 05:00 PM   #14
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well my spur gear is an 88t and I don't remember exactly but I did have to drop 2 or 3 teeth on my pinion.
The x-stock is comparable to the old green machine3.
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Old 03-29-2007, 06:05 PM   #15
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what did you like better the x-stock or the co27? and was it road course or oval?
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Last edited by Jake S; 03-29-2007 at 06:23 PM.
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