Go Back  R/C Tech Forums > General Forums > Radio and Electronics
Motor Testing and Comparisons >

Motor Testing and Comparisons

Community
Wiki Posts
Search
Like Tree532Likes

Motor Testing and Comparisons

Thread Tools
 
Search this Thread
 
Old 08-27-2025 | 03:40 PM
  #406  
gigaplex's Avatar
Tech Champion
iTrader: (2)
 
Joined: Dec 2015
Posts: 7,766
From: Melbourne, VIC
Default

Originally Posted by biz77
Not sure how it would make tech easier. Instead of having a universal minimum IR for a given wind of motor, the tech official must now look up the minimum IR for each motor they tech. Instead of needing to know four different minimum IRs (one each for 25.5, 21.5, 17.5 and 13.5 motors) you'll need access to the minimum IR for 139 different motors (the current number of approved 25.5, 21.5, 17.5 and 13.5 turn motors) and this list will grow as manufacturers submit new motors as we get closer to the September 2026 switchover. In addition to that, in many cases there are multiple versions of the same brand and wind motor. For example ORCA has three different approved versions of the Blitreme3 25.5 motor with three different minimum IR's.
While I generally agree with your point, the scrutineer needs that printout anyway to be able to check if you have the correct rotor part number etc.
OffRoadJunkie likes this.
gigaplex is offline  
Old 08-27-2025 | 04:38 PM
  #407  
OffRoadJunkie's Avatar
Thread Starter
Tech Champion
iTrader: (10)
 
Joined: Jul 2020
Posts: 6,325
From: California
Default

Originally Posted by EAMotorsports
The value of the motors will be recorded when inspected at ROAR. This number will then be posted on ROAR's site for each motor so that tracks and large races will know exactly what was submitted and legal. If its below that then its illegal. There is no variance. What is posted is the min resistance at 77F for that motor. If the motor is at a different temp there is a chart for copper resistance versus temp as its a direct correlation.

So it should be even easier for people to tech now than before.

EA

Good point. I forgot about that.


OffRoadJunkie is offline  
Old 08-27-2025 | 04:42 PM
  #408  
OffRoadJunkie's Avatar
Thread Starter
Tech Champion
iTrader: (10)
 
Joined: Jul 2020
Posts: 6,325
From: California
Default

Originally Posted by biz77
Not sure how it would make tech easier. Instead of having a universal minimum IR for a given wind of motor, the tech official must now look up the minimum IR for each motor they tech. Instead of needing to know four different minimum IRs (one each for 25.5, 21.5, 17.5 and 13.5 motors) you'll need access to the minimum IR for 139 different motors (the current number of approved 25.5, 21.5, 17.5 and 13.5 turn motors) and this list will grow as manufacturers submit new motors as we get closer to the September 2026 switchover. In addition to that, in many cases there are multiple versions of the same brand and wind motor. For example ORCA has three different approved versions of the Blitreme3 25.5 motor with three different minimum IR's.

The good thing is, ROAR cleaned up their site so it makes it easier to find motors. Not too long ago, motors were spread all over the place, and there were motors that dated back to 2015. Now they are broken up into windings.
OffRoadJunkie is offline  
Old 08-27-2025 | 04:46 PM
  #409  
OffRoadJunkie's Avatar
Thread Starter
Tech Champion
iTrader: (10)
 
Joined: Jul 2020
Posts: 6,325
From: California
Default

Originally Posted by Mac The Knife
When was the last time you had a motor teched? and what was the circumstances behind it?
For club racing, it won't matter. Trophy races? Maybe. Roar regional races and the worlds races, then it would matter, and it's on the Roar officials.
Otherwise, your just whinging just to whinge.

This is very true. Outside a worlds or national race, I have never seen a motor get inspected. Even with handouts.
OffRoadJunkie is offline  
Old 08-28-2025 | 06:54 PM
  #410  
Team EAM
iTrader: (79)
 
Joined: Dec 2001
Posts: 9,866
From: Murfreesboro, TN
Default

Originally Posted by biz77
Not sure how it would make tech easier. Instead of having a universal minimum IR for a given wind of motor, the tech official must now look up the minimum IR for each motor they tech. Instead of needing to know four different minimum IRs (one each for 25.5, 21.5, 17.5 and 13.5 motors) you'll need access to the minimum IR for 139 different motors (the current number of approved 25.5, 21.5, 17.5 and 13.5 turn motors) and this list will grow as manufacturers submit new motors as we get closer to the September 2026 switchover. In addition to that, in many cases there are multiple versions of the same brand and wind motor. For example ORCA has three different approved versions of the Blitreme3 25.5 motor with three different minimum IR's.
Obviously youve never looked at numbers from previoius motors. Every single motor has its OWN resistance and has since the rules were redone years ago. It was just harder to find.

Go to this page https://www.roarracing.com/approved_...ess_motors.php and look at the column with resistance and scroll down. It has the min for EACH motor listed. That is THAT motors min....not the overall min you are referring to. That overall min is just the lowest it can be when submitted. Once submitted each motor has its own min for tech purposes. So if you have been racing at places using the overall min then you have been racing where it wasnt dont correclty.


EA
gigaplex likes this.
EAMotorsports is offline  
Old 08-28-2025 | 07:00 PM
  #411  
Team EAM
iTrader: (79)
 
Joined: Dec 2001
Posts: 9,866
From: Murfreesboro, TN
Default

Originally Posted by OffRoadJunkie
The good thing is, ROAR cleaned up their site so it makes it easier to find motors. Not too long ago, motors were spread all over the place, and there were motors that dated back to 2015. Now they are broken up into windings.
Yes its been cleaned up and the resistance numbers have been posted in a much easier place to find now! See post below.
EA
hunterdawg and OffRoadJunkie like this.

Last edited by EAMotorsports; 08-28-2025 at 07:58 PM.
EAMotorsports is offline  
Old 09-06-2025 | 08:25 PM
  #412  
OffRoadJunkie's Avatar
Thread Starter
Tech Champion
iTrader: (10)
 
Joined: Jul 2020
Posts: 6,325
From: California
Default

The ORCA on The Jerry video is up. I was quite surprised on how well it performed.

OffRoadJunkie is offline  
Old 09-09-2025 | 03:30 PM
  #413  
Team EAM
iTrader: (79)
 
Joined: Dec 2001
Posts: 9,866
From: Murfreesboro, TN
Default

Originally Posted by OffRoadJunkie
The ORCA on The Jerry video is up. I was quite surprised on how well it performed.

https://youtu.be/fciX1-VT_rk
They have been very fast in onroad for the guys running them!

EA
EAMotorsports is offline  
Old 09-17-2025 | 03:36 PM
  #414  
OffRoadJunkie's Avatar
Thread Starter
Tech Champion
iTrader: (10)
 
Joined: Jul 2020
Posts: 6,325
From: California
Default

Long story short, Today I met a guy who saw a brushless motor on my desk. After talking about getting back into racing, he told me I should check out the YouTube channel called WutUp Clegg to help me pick out a motor. Acting like I didn't know anything about that channel, I went onto YouTube and had him point out the channel. After glancing at a couple videos, I clicked on a video that showed my face. It took a second, but the guy about crapped when he realized it was me in the videos.

OffRoadJunkie is offline  
Old 09-17-2025 | 11:00 PM
  #415  
STLNLST's Avatar
Tech Lord
iTrader: (33)
 
Joined: Sep 2001
Posts: 10,295
From: Sacramento
Default

Lol

OffRoadJunkie likes this.
STLNLST is offline  
Old 09-18-2025 | 03:10 AM
  #416  
Roelof's Avatar
Tech Lord
 
Joined: Aug 2007
Posts: 14,051
From: Holland
Default

Originally Posted by OffRoadJunkie
Long story short, Today I met a guy who saw a brushless motor on my desk. After talking about getting back into racing, he told me I should check out the YouTube channel called WutUp Clegg to help me pick out a motor. Acting like I didn't know anything about that channel, I went onto YouTube and had him point out the channel. After glancing at a couple videos, I clicked on a video that showed my face. It took a second, but the guy about crapped when he realized it was me in the videos.
I know that. Not in that same way but many racers here like to make fun of me of my engine mods and trust more in other names with which a few contacted me in the past about how and what to do. Even at my local club I explained it to a guy and he is now doing some engines for some Serpent drivers from the club. But I stopped to provide the timing numbers I use and only provide some numbers that give some improvement.
A close friend who I explained it all and with who I do some engines for a national hero did found my name on one modifier his FB page because he had an engine from this guy an a person wanted a copy of it.
There is another Dutch racer who started to make his own 3D printed engine stand to measure timings and asking 200 euro for it. One problem, some of his customers did come to me to ask about what to modify. That was the moment I did quit giving the full info. I have nothing against teaching how to do it your self but I hate the idea such people can ask absurd prices for a bad working stand and provide no knowledge/support. But also with a supported racer from our side we do not want to give away the speed secrets
OffRoadJunkie likes this.
Roelof is offline  
Old 11-08-2025 | 05:27 PM
  #417  
Tech Champion
iTrader: (2)
 
Joined: Feb 2011
Posts: 8,406
Default

There are no speed secrets, just racers who don't look for info while trying to race with their wallets...You need to be looking for a motor design that allows the rotor to be centered naturally(no force needed) in the magnetic field while being 0.3mm to 0.6mm away from the sensor board...All the other attributes like strong rotors and low resistance stators, etc, are secondary...
bertrandsv87 is online now  
Old 11-09-2025 | 03:00 AM
  #418  
Roelof's Avatar
Tech Lord
 
Joined: Aug 2007
Posts: 14,051
From: Holland
Default

Originally Posted by bertrandsv87
There are no speed secrets, just racers who don't look for info while trying to race with their wallets...You need to be looking for a motor design that allows the rotor to be centered naturally(no force needed) in the magnetic field while being 0.3mm to 0.6mm away from the sensor board...All the other attributes like strong rotors and low resistance stators, etc, are secondary...
There are speed secrets because most racers do not share all the "special" things they do or get from their sponsors like in the 1/8 sponsored drivers get bodies from a special lightweight material you can not get and for important races in certain circumstances like very hot or very cold weather we have seen teamdrivers getting better suitable plastics.

In the time the Speed Passion set was mandatory for many races like the ETS there were a lot of speed secrets making drivers much faster but most of them were illegal mods.
OffRoadJunkie likes this.
Roelof is offline  
Old 11-10-2025 | 04:47 PM
  #419  
OffRoadJunkie's Avatar
Thread Starter
Tech Champion
iTrader: (10)
 
Joined: Jul 2020
Posts: 6,325
From: California
Default

Originally Posted by Roelof
I know that. Not in that same way but many racers here like to make fun of me of my engine mods and trust more in other names with which a few contacted me in the past about how and what to do. Even at my local club I explained it to a guy and he is now doing some engines for some Serpent drivers from the club. But I stopped to provide the timing numbers I use and only provide some numbers that give some improvement.
A close friend who I explained it all and with who I do some engines for a national hero did found my name on one modifier his FB page because he had an engine from this guy an a person wanted a copy of it.
There is another Dutch racer who started to make his own 3D printed engine stand to measure timings and asking 200 euro for it. One problem, some of his customers did come to me to ask about what to modify. That was the moment I did quit giving the full info. I have nothing against teaching how to do it your self but I hate the idea such people can ask absurd prices for a bad working stand and provide no knowledge/support. But also with a supported racer from our side we do not want to give away the speed secrets

With that info, you should have offer to tune motors for a profit. Seriously!
OffRoadJunkie is offline  
Old 11-11-2025 | 02:17 AM
  #420  
Roelof's Avatar
Tech Lord
 
Joined: Aug 2007
Posts: 14,051
From: Holland
Default

Originally Posted by OffRoadJunkie
With that info, you should have offer to tune motors for a profit. Seriously!
Oh, no problem, there are people willing to send me an engine and basically I do earn some extra money with it. I even have a guy on the other side of the world sending some engines from time to time. The problem in this world is that some big name can say/sell crap everyone believe/want it, if some normal guy with true knowledge does the same no one is interested. But I do hate that some higher level racer made a stand to measure timings a bit based on mine and a bit on one of another guy and some of his buyers do find me wanting to know more. More annoying is that he is not criticized by his customers about the lack of knowledge but that guy can make fun of of me.
I have seen several OS based engines from big named modifiers like Ielasi, ASM and Kabuto and all were just OS stock engines with some slight grind marks and hardly to non timing changes, the Kabuto even had a lower timed stock crankshaft. And yet, people love to pay 100 euro more getting that engine. Even Hasi with his customer engines has some timing changes but still there is much more room for more performance you as a simple customer do not get but I am pretty sure the teamdrivers from all those brands do get.

Although it is a weird world where the big names can say/do/sell everything I still get enough credits for my shared info and builds. And I am still proud I started the hype with FDR meters where once on the ETS 3 topdriver were send home thanx to one of my 1st build meters. Last even Fenix made a video about diff maintenance and did mention and use my diff plate polish tool.

Roelof is offline  


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.