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Old 06-14-2010, 04:17 PM   #1
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Default 13.5t gear ratio for tekin rs

hello, i m new to tekin esc and i am not quite sure how to set up the esc and the right gear ratio for tekin rs that use 13.5 epic duo 2 motor.
this outdoor asphalt track has about 120 feet of straight

i used x ray t3 with timing boost 30 turbo boost 7, 108 spur and 42 pinion and the motor temp is around 110f after 10 min of run time

any help would be apprieciated
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Old 06-14-2010, 04:27 PM   #2
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This is all you need:

http://www.rctech.net/forum/electric...-sensored.html

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Old 06-14-2010, 04:51 PM   #3
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I'm a bit of a newb, but your FDR sounds way too low to me. Most 13.5 setups I've seen for a Tekin RS running Vegas 2.03 use a FDR anywhere between 6.5 and 8. If I calculated it right, your FDR is currently 4.885 (108/42 X 1.9)
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Old 06-14-2010, 05:32 PM   #4
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thanks for the info. is that mean i will need smaller pinion?

Last edited by littlealex; 06-14-2010 at 05:48 PM.
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Old 06-14-2010, 06:08 PM   #5
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thanks for the info. is that mean i will need smaller pinion?
Yes. I would try somewhere around a 24t pinion with that spur. This will give you an FDR of 7.34.
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Old 06-14-2010, 06:17 PM   #6
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Quote:
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I'm a bit of a newb, but your FDR sounds way too low to me. Most 13.5 setups I've seen for a Tekin RS running Vegas 2.03 use a FDR anywhere between 6.5 and 8. If I calculated it right, your FDR is currently 4.885 (108/42 X 1.9)
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Yes. I would try somewhere around a 24t pinion with that spur. This will give you an FDR of 7.34.
he has low timing(37 total) where everyone else is 60-70
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Old 06-14-2010, 07:23 PM   #7
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just wondering how do you calculate gear ratio?
how should i set my timing? will too much timing shorten motor life or cause motor heat up faster?
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Old 06-14-2010, 11:29 PM   #8
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anyone wanna help out a newbie please?
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Old 06-15-2010, 10:06 AM   #9
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Final Drive Ratio can be calculated like this: Spur divided by Pinion multiplied by Internal (drivetrain) ratio

The Drivetrain Ratio (also called the internal ratio) on a T3 is 1.9. Drivetrain ratio is the number of teeth on the differential/spool pulleys(38 for a T3) divided by the number of teeth on the layshaft pulleys(20 for a T3).

So for your car the formula is:
Spur/Pinion X 1.9 = FDR
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Old 06-15-2010, 11:39 AM   #10
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apprieciated for the info. now i know how to get the right gear

also wondering does people use smaller spur and bigger pinion for boost applications?

Last edited by littlealex; 06-15-2010 at 12:38 PM.
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Old 06-16-2010, 04:50 PM   #11
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apprieciated for the info. now i know how to get the right gear

also wondering does people use smaller spur and bigger pinion for boost applications?
Use this site to choose your gearing http://www.gearchart.com/index.cfm?f...n=chart.create just select Xray t2 and change the transmission ratio to 1.9.

p.s. turn your pc volume down
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Old 06-17-2010, 04:14 AM   #12
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You need to have a read through the Tekin RS thread. I know there are hundreds ofpages, but if you pick a spot in the last few months and read 3 or 4 pages, there will be good info on what you want to know.
Everyone has to do it, there is no absolute right answer, you just need to look around and start trying things out
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Old 06-17-2010, 07:54 PM   #13
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alright, i will do my study and try different gears and post my result here
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Old 11-30-2012, 03:33 AM   #14
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Nobody really answers his question. I was also looking for right FDR for 13.5T w/ no boost. If he uses 4.8 FDR and yet the motor temp is 110F, it should be fine with that. He has to check ESC temp too. I would be alarmed if either of them goes above 150F. Manuals usually say ok till 180F but I would keep it down below 160F for both of them.
e.g. My set up for 17.5T blinky Xray T3: FDR: 3.8(S96 P48)
10.5T with timing boost 50, turbo7: FDR: 5.29(S78 P28)
For both, I was able to keep the temp below 150F.
It can vary greatly depending on his driving skill. If he sucks at driving bumping into other cars, walls, using a lot of brakes, going full throttle every corner, then he'll be seeing a lot higher temp than I do when using the same FDR.
I'll probably go with 4.8 FDR with 13.5T blinky first and work my way up or down. BTW, I'm using Tekin RS as well.
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Old 11-30-2012, 08:56 PM   #15
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13.5 no boost 4.5
13.5 boost 7.0

these are good starting points
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