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Old 02-12-2007, 02:13 PM   #17506
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[QUOTE=Rogier]OMG... is it that hard to look back one page in this thread??

[url]http://www.tamiya.com/japan/rc/rcmanual/49394trf415msx.pdf[/ur
Sorry dude 1st time on this thread
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Old 02-12-2007, 02:27 PM   #17507
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Quote:
Originally Posted by Rogier
OMG... is it that hard to look back one page in this thread??
wow... maybe you could read what he actually asked for, instead of slamming him for not reading the 4000 pages in this thread first.....

www.tamiya.com/english/rc/rcmanual/trf415.pdf

try that one..
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Old 02-12-2007, 04:12 PM   #17508
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Default 2.187 formula

if i change the stock spur gear on my trf415 msx mre(102t .4 module) to 64 pitch,the 2.187 number that the manual gives to multiply by change to a different one?
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Old 02-12-2007, 04:17 PM   #17509
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if i change the stock spur gear on my trf415 msx mre(102t .4 module) to 64 pitch,the 2.187 number that the manual gives to multiply by change to a different one?

i dont get what your saying?
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Old 02-12-2007, 04:37 PM   #17510
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in the instruction manual,page 20,it tells you the gear ratios according to the differents pinion geras. the formula is:
spur gear teeth divided by pinion gear teeth x 2.187
now the stock spur is 102t so its 102t/xxt x 2.187
the pitch on that tamiya spur gears are.04 module pitch which is not quiet 64 pitch.
if I change for a 102t 64 pitch is that 2.187 change?
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Old 02-12-2007, 05:07 PM   #17511
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Quote:
Originally Posted by racer43
in the instruction manual,page 20,it tells you the gear ratios according to the differents pinion geras. the formula is:
spur gear teeth divided by pinion gear teeth x 2.187
now the stock spur is 102t so its 102t/xxt x 2.187
the pitch on that tamiya spur gears are.04 module pitch which is not quiet 64 pitch.
if I change for a 102t 64 pitch is that 2.187 change?
2.187 is the internal ratio that ratio is calculated by dividing the no. of teeth on the centre pulley and the diff pulley.

but i thought the ratio on the mre was 2.25

So changing the spur gear won't affect the 2.187 number

Hope this helps
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Old 02-12-2007, 05:07 PM   #17512
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Quote:
Originally Posted by racer43
in the instruction manual,page 20,it tells you the gear ratios according to the differents pinion geras. the formula is:
spur gear teeth divided by pinion gear teeth x 2.187
now the stock spur is 102t so its 102t/xxt x 2.187
the pitch on that tamiya spur gears are.04 module pitch which is not quiet 64 pitch.
if I change for a 102t 64 pitch is that 2.187 change?
No, it stays the same.
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Old 02-12-2007, 06:33 PM   #17513
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the MSX is 2.187. The MRE uses slightly larger pulleys so the internal on it IS 2.25
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Old 02-12-2007, 06:42 PM   #17514
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Changing the spur gear on your car won't affect the car's internal drive ratio, it will change your overall gear ratio.

To get the internal ratio, divide the larger pulley by the smaller one, 36/16 = 2.25

So if you have an MRE: spur/pinion x 2.25 = FDR
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Old 02-13-2007, 04:35 PM   #17515
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Default motors 19T

GETTING READY for TCs what r u guy's gering the checkpoint money 19t and the new trinity 19t based on the MS not mre
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Old 02-13-2007, 04:55 PM   #17516
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im running a 110 spur 64dp on my msx mre with a checkpoint 19t i was hoping some of you guys could help me with the gearing i havent got the grasp of all this rollout stuff yet.so as it stands what pinions should i be using
indoor carpet racing
if someone has the patience to help me understand the gearing it would be of a great help
i would of thought you want your car toping out just at the top of the longest straight?
but this still leaves me with what size pinions to buy?
thanks in advance
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Old 02-13-2007, 05:21 PM   #17517
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Quote:
Originally Posted by pug 205 gti
im running a 110 spur 64dp on my msx mre with a checkpoint 19t i was hoping some of you guys could help me with the gearing i havent got the grasp of all this rollout stuff yet.so as it stands what pinions should i be using
indoor carpet racing
if someone has the patience to help me understand the gearing it would be of a great help
i would of thought you want your car toping out just at the top of the longest straight?
but this still leaves me with what size pinions to buy?
thanks in advance
What i heard for my stallion a good final drive is 6 to 6.20 so for you U need to find that ..for the stock 415ms that would be 102/36 if u look in your book in the back it tells u how to do it...
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Old 02-13-2007, 05:46 PM   #17518
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It's tough to say what grearing you should run with out knowing the size of the track. For a Checkpoint or Komodo, I agree with the post above: Start out at 102/36. That should be real close. If the straight is smaller than 100 feet, go down a tooth. I run on a track that's similar to the size of the Tamiya track and 102/37 is PERFECT gearing for me.
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Old 02-13-2007, 09:02 PM   #17519
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@ 6 to 6.20 what motor temp will i see ?
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Old 02-13-2007, 09:34 PM   #17520
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Quote:
Originally Posted by Customworksking
@ 6 to 6.20 what motor temp will i see ?
My motor temp is around 140 degrees. Running 6.2 FDR. If I go to 6.0, the motor temp is around 160 degrees. I like to keep it geared for the infield so I run usually between 6.2- 6.3, I give up a little top end on the straight but I'm very quick in the infield and my rutime is around 8 min. before the battery dumps.
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