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Old 11-05-2012, 09:14 PM   #436
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Hey guys running 17.5 boosted on a 70x50 carpet track ...can this motor handle a 3.7 fdr in boosted or should I start around 4...thanks
Start at 6fdr, that would be a good starting point.
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Old 11-10-2012, 09:43 AM   #437
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Well i tested a second 17.5 today and had the same problem as the first.

Every once in awhile when accelerating out of turn the car stutters. If I stop after tapping a corner the won't start, it acts just like the sensor board went bad. Wait a second and it's back to normal, for a short while.

I'm fairly convinced it's the Tekin\Motor combo that's not working. We have others running this motor successfully with different ESC's. I have a 13.5 in my WGT with a Hobbywing 1S and it works fine.

There's something about the sensor signal from the motor my Tekin does not like. There's another racer at our track with a Tekin that has had issues as well, just not as often.

It's too bad i really wanted to run this motor at IIC.
Figured I would post this. I experienced the same issue. Just purchased a D3.5 Trinity based motor, hooked it up on workbench and it stutters at low speed and throttle response is erratic. Using Tekin RS (not pro version). Being run in 1/12th 1 cell with TQ cell booster. After a substantial amount of research found it has something to do with the interaction of the sensor function with these motors. I tried my Revtech (basically same type motor) and got the same results. Tried my Reedy, Thunderpower and even a old Trinity Duo 1 and no problem. When the problem occurs the LED's used for sensor identification on the TEKIN do not work. I took the same motors and hooked them up on my touring car (2 cell) and problem was gone. Initially thought faulty motor but worked fine in 2 cell application. Almost as if the 1 cell voltage somehow was impeding the sensor function. Next I used a receiver pack,,,,,,,,problem resolved! I don't know if it is a problem with my ESC or that these motors require usage of a receiver pack but now it works properly. Gonna see if I can get another ESC to try in the car to determine if it is a problem with my particilar ESC or maybe it is related to the battery booster when those types of motors are used. At least I have it working. Don't like having to use another pack but if that's what it takes. Hopefully this info will help out one of you guys and save you some of the high anxiety I went through.
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Old 11-10-2012, 09:56 AM   #438
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We found out at IIC that earlier versions of the Tekin ESC have issues with the voltage being used in the sensor board of the d3.5. Contact Tekin and see what they can do for you. I believe they were replacing ESC's for people at the race that had the older version.
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Old 11-10-2012, 10:55 AM   #439
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We found out at IIC that earlier versions of the Tekin ESC have issues with the voltage being used in the sensor board of the d3.5. Contact Tekin and see what they can do for you. I believe they were replacing ESC's for people at the race that had the older version.
I've also heard that replacing the sensor board on the D3.5 with one from a D3 will work with the older Tekins too. Worth a try if you have one on hand.
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Old 11-10-2012, 12:13 PM   #440
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I bought 2 new D3.5's from EA, 1 17.5 for 12th scale, 1 13.5 for WGT for IIC. I had 2 older Tekins, 1 RS and 1 RS Pro. Neither new motor would work on either speedo. My old D2 would work fine. Even after have EA and Dieter looked at these, still nothing. They acted like the sensor boards were bad. I missed all of the first day of practice. Only after Randy Pike arrived on Wed were we able to diagnose the problem. The D3.5's require 5 volts to the sensors to work. The older motors only require 3.5 volts. Neither of my speedos were outputting the needed 5 volts. Randy traded out these 2 speedos for me and problemed solved.
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Old 11-10-2012, 08:44 PM   #441
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Just blew my D3 last night, so I'm looking for a replacement.

I run Boosted 17.5 TC, both out door asphalt and indoor carpet with a speed passion prostock 2.1. I loved my D3, so I'm wondering how the d3.5 compares for boosted stock.

And even if its good for boost, what version do I want? With the standard D3.5, then the Maxilla, then there's express motorsports Zapper and Ripper, then EA motorsports standard and Magzilla... how do I choose?
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Old 11-10-2012, 09:07 PM   #442
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I spoke with Randy at IIC, learned the voltage supply circuit used for the sensor board is not supplying the proper voltage due to it being damaged during use. Tekin's nominally output 6v to the sensor board. If damaged this voltage will be lower and the D3.5 motors seem to be sensitive to voltage level. Randy measured the voltage on my Tekin that was having issues to find it was only 3v. Put in a new ESC that measured 6v and I've never had the problem again.
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Old 11-11-2012, 05:47 PM   #443
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I could use some gearing/timing suggestions for a blinky 21.5 on a 100x36 carpet track.
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Old 11-11-2012, 06:05 PM   #444
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I could use some gearing/timing suggestions for a blinky 21.5 on a 100x36 carpet track.
Around 4.0, with a 12.3 general rotor / full timing....
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Old 11-11-2012, 06:13 PM   #445
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Originally Posted by wollow86 View Post
Just blew my D3 last night, so I'm looking for a replacement.

I run Boosted 17.5 TC, both out door asphalt and indoor carpet with a speed passion prostock 2.1. I loved my D3, so I'm wondering how the d3.5 compares for boosted stock.

And even if its good for boost, what version do I want? With the standard D3.5, then the Maxilla, then there's express motorsports Zapper and Ripper, then EA motorsports standard and Magzilla... how do I choose?
When I ran boosted 17.5, I'd use a D3 with a 12.3 broad power rotor. The 12.5 hi-torque (Magzilla) will typically run hotter and doesn't like the high RPM of boosting... that's why it's good in blinky. The smaller/less powerful rotors run cooler and wind up faster. I'd go with the standard D3.5 from EA.... hope this helps!
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Old 11-11-2012, 07:42 PM   #446
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Thanks, I was way off-a 3.25 FDR with anywhere from 10-25* timing.


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Around 4.0, with a 12.3 general rotor / full timing....
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Old 11-11-2012, 08:08 PM   #447
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Thanks, I was way off-a 3.25 FDR with anywhere from 10-25* timing.
We are running 3.8 for 17.5 FDR with full timing, because of the additional weight in USGT, you need to run about the same FDR.... but start on the safe side of 4.0... Temp and add a tooth if you feel the need...
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Old 11-11-2012, 08:42 PM   #448
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was using the 17.5 yesterday and went to put on full timing on the end bell and it didn't quite get there, stopped i think at around 20 degrees? any info on this or should i pull the thing apart and see why.....
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Old 11-11-2012, 11:59 PM   #449
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Can anyone share the "sweet spot" for the 3.5 in 13.5 1/12 all motor? I havent had to much time to test with the motor but as far as I can tell it seems to like less gear than the reedy's that the rest of the guys run at my local track. Any input on this?
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Old 11-12-2012, 04:47 AM   #450
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Quote:
Originally Posted by bkspeedo View Post
I spoke with Randy at IIC, learned the voltage supply circuit used for the sensor board is not supplying the proper voltage due to it being damaged during use. Tekin's nominally output 6v to the sensor board. If damaged this voltage will be lower and the D3.5 motors seem to be sensitive to voltage level. Randy measured the voltage on my Tekin that was having issues to find it was only 3v. Put in a new ESC that measured 6v and I've never had the problem again.
Is this voltage or sensor board problem with the Tekins only being experienced with 1 cell? Or are people having issues with 2 cell?

I am about to get a D3.5 17.5 to run boosted with my Tekin...
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