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Old 03-07-2016, 12:24 PM   #451
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Well... Smaller spur = higher topspeed & lower acceleration

So yes, you are right... Rollout = just a matter of pinion:spur:tire ratio...

BUT...

To get a proper rollout with a very small spur means often you need a very small pinion too.

The advantage of a larger spur (and therefore a larger pinion) is that there is less tooth-friction in the rollout and that is what you want on a pancar, smoothness...

So in order to get the rollout you want, always try to get to it with the largest possible spur and pinion to keep that tooth-friction to a minimum.
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Old 03-07-2016, 12:39 PM   #452
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Originally Posted by Joost K. View Post
So in order to get the rollout you want, always try to get to it with the largest possible spur and pinion to keep that tooth-friction to a minimum.
Lightbulb moment! That makes very good sense. Thank you.
I've only run 64P onroad - I'm a TC guy and TC pinions and spurs don't seem as susceptible to debris (rocks) as pan car designs, so what brand 48P gears do you recommend? I'm using an IRS axle with a xenon spur? now and the diff ring seems small. Will running larger (diameter) spur gears (48P versus 64P) mean that i'll need larger diff rings?
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Old 03-07-2016, 01:12 PM   #453
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Lightbulb moment! That makes very good sense. Thank you.
I've only run 64P onroad - I'm a TC guy and TC pinions and spurs don't seem as susceptible to debris (rocks) as pan car designs, so what brand 48P gears do you recommend? I'm using an IRS axle with a xenon spur? now and the diff ring seems small. Will running larger (diameter) spur gears (48P versus 64P) mean that i'll need larger diff rings?
The diff rings and ball placement in the spur are pretty standard. You should be ok no matter which brand you run for rings, diff balls and spur gears.
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Old 03-07-2016, 01:20 PM   #454
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Go with Kimbrough 48dp spurs, these are the only ones capable of managing Pan Cars torque, others are too weak

For your IRS axle, use TKO diff rings, these are the best for diff! And also ceramic balls, you'll get the smoothest diff with them
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Old 03-07-2016, 01:29 PM   #455
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Almost all IRS style diff rings will do just fine. I believe that the TKO rings are already sanded which is good. Definately go with ceramic diff balls and if you can, mount a slapmaster thrustbearing or one similar...
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Old 03-07-2016, 02:02 PM   #456
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Go with Kimbrough 48dp spurs, these are the only ones capable of managing Pan Cars torque, others are too weak

For your IRS axle, use TKO diff rings, these are the best for diff! And also ceramic balls, you'll get the smoothest diff with them
+1 Mine are 48P Kimbrough spurs.
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Old 03-07-2016, 02:06 PM   #457
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Definately Kimbrough for me too... Best spurs, good second place are RRP spurs...
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Old 03-07-2016, 02:54 PM   #458
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Same as Joost
After switching to Kimbrough, never stripped a spur again.

Regards Roy
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Old 03-07-2016, 06:55 PM   #459
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I have a serpent 84T 48p spur gear and the gear is almost as big as my rear wheel- but I guess I'm use to the compactness of 64p... Won't that make it more susceptible to rocks being so big?
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Old 03-07-2016, 07:13 PM   #460
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Originally Posted by swerv512 View Post
Lightbulb moment! That makes very good sense. Thank you.
I've only run 64P onroad - I'm a TC guy and TC pinions and spurs don't seem as susceptible to debris (rocks) as pan car designs, so what brand 48P gears do you recommend? I'm using an IRS axle with a xenon spur? now and the diff ring seems small. Will running larger (diameter) spur gears (48P versus 64P) mean that i'll need larger diff rings?
I have a TC and a pan car. The spur on the pan car seems to be in better shape than the TC. Go figure. I guess it's just random luck.
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Old 03-07-2016, 07:44 PM   #461
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+1 Mine are 48P Kimbrough spurs.
John, what size spur gear, pitch and teeth, are you using?
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Old 03-07-2016, 09:01 PM   #462
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I have a TC and a pan car. The spur on the pan car seems to be in better shape than the TC. Go figure. I guess it's just random luck.
Maybe i've just been lucky because i've been on the same 64P set of gears for months in my TC and i run on mildly-prepped asphalt in a parking lot mostly. I'm gonna look for some 48P kimbrough spur gears.. All this 235mm talk has me neglecting my TC threads lol.
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Old 03-07-2016, 09:30 PM   #463
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Its rare to kill a spur in TC because of debris. Its usually caused by a crash and motor moving.

BTW, do you only run at Brisbane?
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Old 03-07-2016, 11:10 PM   #464
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Its rare to kill a spur in TC because of debris. Its usually caused by a crash and motor moving.

BTW, do you only run at Brisbane?
Pretty much... Just getting back into the hobby a few months ago after almost a decade away. Looking forward to getting back into the race scene. So much has changed in the past decade lol. Brisbane is a great place to get some low pressure wheel time re-acquainting myself with setups and driving technique.

On another note:
I found some 48P kimbrough spur gears online. I don't want to get too big here. But I can get a 90, 93, or a 96T. Any reason one is better than another?

Last edited by swerv512; 03-07-2016 at 11:59 PM.
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Old 03-07-2016, 11:21 PM   #465
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Its rare to kill a spur in TC because of debris. Its usually caused by a crash and motor moving.

BTW, do you only run at Brisbane?
TC's are great for bashing. There's a huge lot near my house my TC4 has taken a beating. Spur & chassis, the worst...I quit going there.
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