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Old 11-16-2007, 10:46 AM   #1
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Default Gearing the Novak 17.5 compared to a CO27

Well were going to go up for the Novak race and my son will run in the sportman class with the 17.5.

Couple of questions about the 17.5 gearing:

1) Do I gear about the same as I do for a starting point brushed and brushless?

2) Once I use the gearing as a starting point. Do I use the temp gun to try and obtain about 170 deg motor temp as I am with the 13.5?

The track is about 90 x 48 in size indoor carpet.

Thanks..
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Old 11-16-2007, 11:13 AM   #2
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Sup Big Dog!

Rodger at Trackside did a lot of testing with a 17.5. He found that he had to gear the motor STUIP tall. Much taller than our 13.5. So i would somewhere around a 4.0 ratio.

Hope that helps.
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Old 11-16-2007, 11:36 AM   #3
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I believe there will be a limit on the gear ratio at the Novak race for sportsman class............I don't think it has been determined yet but I will try and find out and get it posted soon

also keep an eye on Trackside.com for rule updates
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Old 11-16-2007, 11:38 AM   #4
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Sup Big Dog!

Rodger at Trackside did a lot of testing with a 17.5. He found that he had to gear the motor STUIP tall. Much taller than our 13.5. So i would somewhere around a 4.0 ratio.

Hope that helps.
4.0 ? I run a 3.96FDR on my 13.5 now
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Old 11-16-2007, 11:43 AM   #5
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4.0 ? I run a 3.96FDR on my 13.5 now
Your parents must be proud
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Old 11-16-2007, 11:44 AM   #6
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Your parents must be proud
they are !!how did you know??
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Old 11-16-2007, 12:51 PM   #7
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Originally Posted by Essnowyt View Post
Sup Big Dog!

Rodger at Trackside did a lot of testing with a 17.5. He found that he had to gear the motor STUIP tall. Much taller than our 13.5. So i would somewhere around a 4.0 ratio.

Hope that helps.
Quote:
Originally Posted by Josh H View Post
I believe there will be a limit on the gear ratio at the Novak race for sportsman class............I don't think it has been determined yet but I will try and find out and get it posted soon

also keep an eye on Trackside.com for rule updates
Thanks guys...

See you boys in just over a month...
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Old 11-16-2007, 04:29 PM   #8
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In my 12th scale I ran it at a 2.95 rollout. It made it near impossible to keep it rolled out as the tires got smaller. In my rubber tire/carpet TC, I run it at around 4.2 final drive. I can go lower and will be soon. It's a great "stock" motor. Finding the room to roll it out is a pain. Welcome to the land of big pinions/small spurs.
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Old 11-16-2007, 05:48 PM   #9
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For 1/12th run something over 3.00. More in the range of 3.18. I have no problem staying with the co27's. Sportpak needs to try harder. You need a 78 spur. You will not be disappointed unless you race sedan then everything is disappointing.
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Old 11-16-2007, 06:52 PM   #10
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You will not be disappointed unless you race sedan then everything is disappointing.
Ouch, babe...Very ouch!
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Old 11-17-2007, 05:44 AM   #11
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Quote:
Originally Posted by sportpak View Post
In my 12th scale...
Quote:
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For 1/12th run...
He is not asking about 1/12 scale ladies! Why even bother with a 17.5 in 1/12 scale?

Snowy.
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Old 11-17-2007, 01:43 PM   #12
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He is not asking about 1/12 scale ladies! Why even bother with a 17.5 in 1/12 scale?

Snowy.
well,he's not asking but alot of people are going to want to know.Our local track last year allowed me to test the 13.5 in 1/12th and decided it was too fast for the stock motors in the class. This year the allow 17.5 in 1/12th. According to CRC (my conversation with John) Franks gearing with the 17.5 was 43-76. I'm geared at 42-92 (which worked well last year for the 13.5) and it ain't fast enough.
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