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Old 02-23-2011, 11:26 AM
  #15436  
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We're up next on the TCS Calendar (Race #161). This will be my first time racing Mini in TCS, and I only have 2 brand new motors. I have been practicing, and testing various setups (not to mention the many parts I have purchased ) for more than a month. If I DQ because of excessive RPM I will be thoroughly disappointed!
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Old 02-23-2011, 11:38 AM
  #15437  
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Originally Posted by Geppetto
We're up next on the TCS Schedule (Race #161). This will be my first time racing Mini in TCS, and I only have 2 brand new motors. If I DQ because of excessive RPM I will be thoroughly disappointed!
I suggest that you just run em!
Oil the bushings and run em, and not too many runs cuz they will eventually seat the brushes completely and that's when they jump up in rpm.
Any special attention will more than likely get them close to the questionable zone.
You have already heard the "I just cleaned it and broke it in and it failed" story.
So don't do that.

Or even better, maybe they will try a new rpm limit just for you guys and see how it goes there.
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Old 02-23-2011, 12:35 PM
  #15438  
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Originally Posted by OSherman
didnt we already have an 18.500-range limit in the past?? or was that at a different voltage?
We've had a couple of rpm limits that I can recall. There was a 13.5@5v one which translates to [email protected]. There was a 12.5@5v one which is [email protected]. The rpms on a stock motor is very close to linear to the voltage. So for those who want to do the math, divide the rpms @5v by 5 and multiply by 7.2. For the true doubters, do the math and then check on your motor tester. You can do the math either way cause the rpms will plot almost on a straight line to the voltage.

As to Charlie's post, if you got DQ'd cause they tested the motor warm, that wasn't fair. Even a slightly warm motor will test 2-400 rpm higher. Motors should be tested cold to give everyone a fair shake. Having people turn their fans off in impound can only be described charitably as misguided. It's almost as if they wanted to DQ the people whose fans they turned off. Out of curiosity, who was the numbskull who did that. No way will a motor cool off in 10 min w/out the help of a fan.
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Old 02-23-2011, 01:10 PM
  #15439  
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Originally Posted by F N CUDA
So now that the true testing has gone on Nationwide, if an 18,500 rpm limit is set would it be fair to say that just about every boxstock motor will easily pass?


The motors I have been getting are CS from my LHS.

All mine have been below 18,500 some above 18,000 @ 7.2v.
The only time I went 19,100 was when tech did not follow procedure and burned his fingers pulling the motor out of my car and testing it ASAP.

I don't consider the guys caught as cheaters, it is an unfair rule that is too low for the newer motors, forcing everybody putting the competition focus on the motors rather than the track.
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Old 02-23-2011, 01:28 PM
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There were a lot of motors going over in Omaha. I had old non-CS motors, and mine still ran over, but just slightly. Luckily I did have one unbroken in older motor that was nowhere near the limit.

I am really against all the voodoo, but I think that it may be necessary to raise the limit 500-1000 rpm. I feel bad for the guys who were just running their cars and found that the motors aged into an illegal state.
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Old 02-23-2011, 03:34 PM
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Originally Posted by SirSwiftAlot
Simple fix!!! PLease tell me everyone knows this already so I don't sound insulting. If you break in the brushes all the way the motor lets say turns 18,000. No break in = 16,000. Guess what DONT ...... break...... the .......brushes....... all....... the...... way....... in!! Water dip for 1 minute or so, remove from water and inspect brush. repat process till brushes are HALF way seated. Dyno motor and if its 16,800 or 17,000 then your good. Run the motor several times in the car and it will slowly pick up the extra RPM desired. This is a simple process that everyone can do. Its like a hair cut - just a little at a time until you get the right length. Any questions please PM Doc or Grandpa GOOD LUCK
This kind of thought is just too radical for this forum. We might have to report you to the moderator…If you continue with these thoughts; we may have to take you out back and…

Lets have a 50,000 RPM limit and really make Red Dot, and the others earn their keep.
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Old 02-23-2011, 04:42 PM
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Fred

It is apparent that you need to raise the RPM limit to 18,500. You said that you would try the first few races to see where it was heading. Alot of these guys that are reporting don't do the motor voodo and there motors are over limit. I think its safe to say that raising the RPM limit would do justice for alot of racers and events in the future. I think that we are dealing with some variances in these CS motors and the right thing to do is raise the limit.
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Old 02-23-2011, 06:57 PM
  #15443  
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no one has mentioned that their stock broken in motor is running in the 19,000 range. Yet.
(raises hand)
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Old 02-23-2011, 07:28 PM
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Originally Posted by A-Ko


The motors I have been getting are CS from my LHS.

All mine have been below 18,500 some above 18,000 @ 7.2v.
The only time I went 19,100 was when tech did not follow procedure and burned his fingers pulling the motor out of my car and testing it ASAP.

I don't consider the guys caught as cheaters, it is an unfair rule that is too low for the newer motors, forcing everybody putting the competition focus on the motors rather than the track.
I recall Mr. Mertes stating this would happen on December 19th right after the rules were posted last year.
Post #14882...
Note: Our testing has shown that the new CS (carbon/silver brush) motors will exceed 17,500 RPM @7.2 volts with only minimal break-in.

Like....way exceed.

Like, 19,000 RPM +.

Just so's you knows.


There were not many believers back than. Maybe Doc does know a thing or two about siver cans, YA THINK?
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Old 02-23-2011, 07:29 PM
  #15445  
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Yeah Fred, with so many postings in just one day, this is solid feedback...
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Old 02-24-2011, 09:02 AM
  #15446  
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Angry Silvercan RPM

One man's experience, this past weekend.

1. Took a "new in the box" 540 J and ran it for 5 minutes at 4 volts , just to keep the brushes from sparking and bouncing.

2. Sprayed it out with motor cleaner and put a drop of oil on each bushing.

3. Dyno'd IAW TCS procedures = 16,800 RPM

4. Put the motor in a TCS legal F104, ran two practice packs , three 6 minute qualifiers and a 6 minute main.

5. Dyno'd again IAW TCS procedures = 17,800 RPM.

Now I need a new motor to be TCS legal?

I've got one , but I'm not sure I want to keep throwing $20 motors at the car.
A couple of races at this rate and you could have bought yourself a brushless motor.

BAH !

Rod
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Old 02-25-2011, 12:41 AM
  #15447  
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Originally Posted by rtypec
Where do I order motors that pull numbers out of the box like you guys? Seriously...the few motors that I have purchased were were in the 14-15K range straight out of the box. What gives? or is there something else going on?
Just what I was thinking ! I was freakin excited when my motor finally hit 16,400 @ 7.2V after more than just "a couple" of minutes break in. Also ran the same motor Saturday in practice and all day Sunday and was still at 16,400 end of day Sunday and that was after cleaning it back up.
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Old 02-25-2011, 09:37 AM
  #15448  
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Out of the 8 new in box motors I had, not one was below 16,300. And I had 2 that were 17,100. Absolutely nothing done to them other than a drop of oil just once when new.
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Old 02-25-2011, 05:25 PM
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Is Tamiya coming out with a CR-Z body?
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Old 02-26-2011, 11:05 AM
  #15450  
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^
http://www.tamiyausa.com/product/ite...oduct-id=58490
ff03 kit form, but probably sold as body only later on.
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