Go Back  R/C Tech Forums > General Forums > Racing Forum
Tamiya Championship Series >

Tamiya Championship Series

Like Tree830Likes

Tamiya Championship Series

Old 05-05-2011, 01:42 PM
  #15586  
FMW
Tech Fanatic
iTrader: (1)
 
FMW's Avatar
 
Join Date: May 2003
Location: Laguna Niguel
Posts: 844
Trader Rating: 1 (100%+)
Default

Today I wanted to announce that we are amending the 540-J RPM motor limits. The new RPM motor limit is 18,750.

The RPM limit has been amended due to a couple of factors that our long term testing has yielded.

1. We have noticed there are two versions of the 540-J motor under the same part number (53689) floating around in the market. One variant has a brush with an engraving titled CS. What this stands for is debatable, but the fact that it exists and that it’s different is our main concern. We suspect it has to do with the type of brush used in the can. The other variant does not have this engraving. It is very likely these two brush types have different performance characteristics.
2. After extensive testing of an un-molested motor, we have found that a motor will inevitably get faster the more you use it, more so than previously thought. We have especially found this to be the case with 540-J motors with the brush with the “CS” engraved into it. Heat cycles and constant running will continue to break in the brush and loosen up the bushings. The motors we have tested by just running them constantly without cleaning or tampering for the past few months have proven this.

We feel it’s not fair to penalize TCS racers with RPM limits that don’t address the above two findings. The new 18,750 motor limit is absolute beginning with TCS race #163. We will continue to use the “step test” test method as described in the TCS rules and if a motor is found to exceed that limit the racers run will be disqualified.

We are aware that most of you have had motors at the very limit of the old RPM rule sitting in your pit box. We hope you are now able to use these and remain legal with the new limit.

Good luck to you all at the upcoming TCS Regional in Aliso Viejo, CA next week.

Fred

P.S. Speedtech R/C will be at the TCS regional event on Sunday May 15. Make sure to pick up your TCS race supplies and parts =)
FMW is offline  
Old 05-05-2011, 02:10 PM
  #15587  
Tech Master
iTrader: (94)
 
Join Date: Aug 2002
Location: Maryland
Posts: 1,421
Trader Rating: 94 (100%+)
Default


Last edited by Markus; 05-05-2011 at 03:12 PM.
Markus is offline  
Old 05-05-2011, 08:38 PM
  #15588  
Tech Master
iTrader: (2)
 
Join Date: Jan 2004
Location: West of Crook County Illinois
Posts: 1,979
Trader Rating: 2 (100%+)
Default

Originally Posted by FMW
Today I wanted to announce that we are amending the 540-J RPM motor limits. The new RPM motor limit is 18,750.

The RPM limit has been amended due to a couple of factors that our long term testing has yielded.

1. We have noticed there are two versions of the 540-J motor under the same part number (53689) floating around in the market. One variant has a brush with an engraving titled CS. What this stands for is debatable, but the fact that it exists and that it’s different is our main concern. We suspect it has to do with the type of brush used in the can. The other variant does not have this engraving. It is very likely these two brush types have different performance characteristics.
2. After extensive testing of an un-molested motor, we have found that a motor will inevitably get faster the more you use it, more so than previously thought. We have especially found this to be the case with 540-J motors with the brush with the “CS” engraved into it. Heat cycles and constant running will continue to break in the brush and loosen up the bushings. The motors we have tested by just running them constantly without cleaning or tampering for the past few months have proven this.

We feel it’s not fair to penalize TCS racers with RPM limits that don’t address the above two findings. The new 18,750 motor limit is absolute beginning with TCS race #163. We will continue to use the “step test” test method as described in the TCS rules and if a motor is found to exceed that limit the racers run will be disqualified.

We are aware that most of you have had motors at the very limit of the old RPM rule sitting in your pit box. We hope you are now able to use these and remain legal with the new limit.

Good luck to you all at the upcoming TCS Regional in Aliso Viejo, CA next week.

Fred

P.S. Speedtech R/C will be at the TCS regional event on Sunday May 15. Make sure to pick up your TCS race supplies and parts =)
Thanks Fred for the change.

It takes the stress away from being under the 17,500 limit and the work to keep an unmolested 540-J under that limit. I am sure the race event organizers will feel the less stress too.
A-Ko is offline  
Old 05-05-2011, 10:38 PM
  #15589  
Tech Champion
iTrader: (34)
 
F N CUDA's Avatar
 
Join Date: May 2007
Location: Mission Viejo, So Cal
Posts: 5,908
Trader Rating: 34 (100%+)
Default

I pity the fools that come in at 18,751.
F N CUDA is offline  
Old 05-06-2011, 05:36 AM
  #15590  
Tech Fanatic
iTrader: (67)
 
SRBMOJO's Avatar
 
Join Date: Jul 2007
Location: ORANGE CO., CA
Posts: 977
Trader Rating: 67 (100%+)
Default

Originally Posted by F N CUDA
I pity the fools that come in at 18,751.
I pity the fools like me who are gonna come in at 17,500, and leave 1,250 rpms on the table. Need some magic!
SRBMOJO is offline  
Old 05-06-2011, 09:04 AM
  #15591  
Tech Champion
iTrader: (34)
 
F N CUDA's Avatar
 
Join Date: May 2007
Location: Mission Viejo, So Cal
Posts: 5,908
Trader Rating: 34 (100%+)
Default

Originally Posted by SRBMOJO
I pity the fools like me who are gonna come in at 17,500, and leave 1,250 rpms on the table. Need some magic!
Nah dude, aint all about RPM. Go thru your motors or start with a freshy, run it, clean it and find the perfect gearing for it and hopefully if we get spanked by horsepower it'll get equalled out at the tech table.
F N CUDA is offline  
Old 05-06-2011, 09:30 AM
  #15592  
Tech Fanatic
iTrader: (67)
 
SRBMOJO's Avatar
 
Join Date: Jul 2007
Location: ORANGE CO., CA
Posts: 977
Trader Rating: 67 (100%+)
Default

Originally Posted by F N CUDA
Nah dude, aint all about RPM. Go thru your motors or start with a freshy, run it, clean it and find the perfect gearing for it and hopefully if we get spanked by horsepower it'll get equalled out at the tech table.
Yeah, I guess i gotta run my own race and see how the cards fall. New to this silver can game, gearing is gonna be the key. Unfortunately, I have only had two runs against other GT-2 cars in practice over the last 2 months, one run the car was very competitive against a guy who said his car was an A-main qualifier. The other one not so good against a contender.
SRBMOJO is offline  
Old 05-06-2011, 09:50 AM
  #15593  
Tech Adept
 
RogerHewson's Avatar
 
Join Date: Jun 2006
Location: Long Beach, Ca
Posts: 182
Default 2011 M chassis Enduro!!!

Hello Everyone!

I am just leaving a quick reminder that the 2011 M Chassis Challenge is almost here. The date we have set aside is Saturday, July 16th 2011. The rules should be very similar to last year, as will be the schedule. Information will be available shortly on the Tamiya America website, (www.tamiyausa.com) along with the link for the sign ups. We are even going to do a POST race concourse on the cars that make it through. Entry fees will once again be $20.00 per team, with a maximum of 16 teams so get your entries in early! We had a full field last year and expect it this year! Once the info is posted I will let everyone here know. Thanks for all your support guys!

Roger
RogerHewson is offline  
Old 05-08-2011, 12:16 PM
  #15594  
Tech Regular
 
Join Date: Aug 2008
Location: In der Black Forest mit der elves
Posts: 273
Default Bribes may be on the table

Originally Posted by RogerHewson
Hello Everyone!

I am just leaving a quick reminder that the 2011 M Chassis Challenge is almost here. The date we have set aside is Saturday, July 16th 2011. The rules should be very similar to last year, as will be the schedule. Information will be available shortly on the Tamiya America website, (www.tamiyausa.com) along with the link for the sign ups. We are even going to do a POST race concourse on the cars that make it through. Entry fees will once again be $20.00 per team, with a maximum of 16 teams so get your entries in early! We had a full field last year and expect it this year! Once the info is posted I will let everyone here know. Thanks for all your support guys!

Roger
Roger, any possibility of getting you to reschedule this thing to sometime in June? I have not been able to participate in this thing every year because it's when I have family obligations. I would really like to be part of the fun. Also, frankly, the weather's cooler in June.
Tom Slick is offline  
Old 05-08-2011, 12:51 PM
  #15595  
Tech Apprentice
 
Join Date: May 2003
Location: Kirkland, WA
Posts: 82
Default

Fred - I've been looking to pick up a new TCS legal GT2 sedan for the Lynwood, WA TCS race in August. With the pending announcement of the next generation TA06 and TA06 Pro at the Shizouka Hobby Show next week I'd like to go that way (the Pro) rather than buying the older design TA05. Any idea if it will be legal to run in August at the regional?

While I'm at it I might as well as the same question about the F104X1 chassis for either or both of the F1 classes.

edit: Or how about a "tarmac rally" class in Lynwood so I can run my TB01?
CharlesWA is offline  
Old 05-09-2011, 08:13 AM
  #15596  
Tech Elite
 
Join Date: Oct 2006
Posts: 2,367
Default

Originally Posted by F N CUDA
Nah dude, aint all about RPM. Go thru your motors or start with a freshy, run it, clean it and find the perfect gearing for it and hopefully if we get spanked by horsepower it'll get equalled out at the tech table.
Sorry Craig, RPM is the name of the game. You're right about the gearing tho. A high rpm motor geared wrong is not as good as a lower rpm motor geared right.

Think of it this way. 2 identical cars with 2 identical motors with one geared at 3.9 FDR and the other at 4.1. The 3.9 car will be faster on the straight and the 4.1 car will accelerate quicker. Replace the motor in the 4.1 car with one that has an extra 900 or so RPM, it will stay with the 3.9 car on the straight and still be quicker on acceleration.

Incidentally, the higher rpm motor will, more times than not, produce more torque and thus more horsepower. I am commenting only on the 540J Silvercan motors.
Granpa is offline  
Old 05-09-2011, 09:46 AM
  #15597  
Tech Elite
iTrader: (8)
 
rccardr's Avatar
 
Join Date: Aug 2003
Location: The Secret Underground Laboratory
Posts: 2,353
Trader Rating: 8 (100%+)
Default

...the higher rpm motor will, more times than not, produce more torque and thus more horsepower...
As usual in these matters, you are correct, Bob. Assuming the motor is fairly fresh, higher RPM will also yield higher torque. However, an older (or more heat-abused) motor with weak magnets that 'allows' the arm to spin at a higher rate will produce less torque and reach its RPM peak more slowly.

For those seeking an interesting FDR comparison, the 1st & 2nd finishers at the Frederick TCS event were within a tenth of each other on FDR and nowhere near the 3.9-4.1 numbers being bandied about here. Qualifying times would have put them both well up into the A in GT1 on a 100 X 45 foot high traction asphalt track & both motors came off the track around 130F. So...it's not always about a heavy gear load.
rccardr is offline  
Old 05-09-2011, 11:39 AM
  #15598  
Tech Adept
 
RogerHewson's Avatar
 
Join Date: Jun 2006
Location: Long Beach, Ca
Posts: 182
Default

Sorry Tom,

We can't reschedule it because it is the only month we can squeeze it in the schedule. I apologize it doesn't fit your schedule. Do your best to come out! If not maybe next year!

Roger
RogerHewson is offline  
Old 05-09-2011, 01:55 PM
  #15599  
Tech Champion
iTrader: (34)
 
F N CUDA's Avatar
 
Join Date: May 2007
Location: Mission Viejo, So Cal
Posts: 5,908
Trader Rating: 34 (100%+)
Default

I must have a motor or 2 that have really hi RPM and no matter what gearing I use will not go like my fresher and lower RPM motors.
I guess the hi reving motors I have are used up and will rev but not produce torque to speak of?
RPM is nothing if you can't get to em huh.
F N CUDA is offline  
Old 05-09-2011, 02:32 PM
  #15600  
Tech Elite
iTrader: (26)
 
reenmachine's Avatar
 
Join Date: May 2008
Location: Studio City, CA
Posts: 2,539
Trader Rating: 26 (100%+)
Default

Originally Posted by RogerHewson
Hello Everyone!

I am just leaving a quick reminder that the 2011 M Chassis Challenge is almost here. The date we have set aside is Saturday, July 16th 2011. The rules should be very similar to last year, as will be the schedule. Information will be available shortly on the Tamiya America website, (www.tamiyausa.com) along with the link for the sign ups. We are even going to do a POST race concourse on the cars that make it through. Entry fees will once again be $20.00 per team, with a maximum of 16 teams so get your entries in early! We had a full field last year and expect it this year! Once the info is posted I will let everyone here know. Thanks for all your support guys!

Roger
Great news! I'll rally the Roadrunners RC Club troops! We'll bring at least 2 teams again.
reenmachine is offline  

Thread Tools
Search this Thread

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

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.