R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 02-02-2007, 02:58 AM   #2656
Tech Regular
 
stephen hilton's Avatar
 
Join Date: Dec 2006
Posts: 265
Arrow

Quote:
Originally Posted by MiD CoRNeR
Hello guys, im new in Rc hobby and im really enjoying it so far. I got myself a stock C027 motor and with it i played around using my MM motor master. Its so cool using the quick test with all the motor data showing up like RPM and AMP draw. Now i just wondered what is/are effects of the amp draw in a stock motor performance.

Changing brushes and springs gives me diferent readings on the RPM and AMP draw. How can i interpret its reading. hope someone an shed light on this matter for me. Thanks for your reply.

David
the higher the amps are the more power (generally)
you need the right amount of both power rpm and torque ( a balance)
hth t.k.
stephen hilton is offline   Reply With Quote
Old 02-02-2007, 09:34 AM   #2657
Tech Regular
 
Join Date: Jul 2005
Posts: 280
Default

how much amp's should a stock motor draw, and is their a such thing as to many amp's? these number's are at 2 volts with no fan attached.
bosfan is offline   Reply With Quote
Old 02-03-2007, 11:58 AM   #2658
Tech Regular
 
tom235's Avatar
 
Join Date: Aug 2004
Location: ut
Posts: 327
Default

.
tom235 is offline   Reply With Quote
Old 02-04-2007, 06:29 PM   #2659
Tech Master
 
nikkiesteban's Avatar
 
Join Date: Apr 2005
Posts: 1,649
Trader Rating: 5 (100%+)
Send a message via Yahoo to nikkiesteban
Default

who's here already tried running cam23t motor??
nikkiesteban is offline   Reply With Quote
Old 02-04-2007, 06:32 PM   #2660
Tech Addict
 
TL_XXX-S_racer's Avatar
 
Join Date: Jun 2004
Location: Florida
Posts: 577
Send a message via AIM to TL_XXX-S_racer
Default

Well today, after a fresh cut and new brushes. At 500 sec. my CO27 pulled 9.4 amps. even with a fan. Was fast. Run F brushes and pruple and red springs. The more amp draw the better, but the motor might fade alittle toward the end of the run.

Chris
__________________
ProMatchRacing
"Nobody does it better"

Team Corally

Superior Hobbies
"Supplying all your r/c racing needs"
TL_XXX-S_racer is offline   Reply With Quote
Old 02-04-2007, 07:01 PM   #2661
Tech Master
 
kartermdb's Avatar
 
Join Date: Dec 2003
Posts: 1,120
Trader Rating: 15 (100%+)
Default

More amp draw just means the motor is less efficient and will run hotter when geared the same. I tune my co's to pull about 6 amps after break in at 2 volts without a fan. i have found out that when the motor pulls less amps, you can actually gear up and have a faster car
__________________
Mark Burt
Thanks to:
TRINITY - Revtech - Awesomatix USA - Side Piece Racing - Roche RC USA - Darkside Motorsports - Genesis R/C Raceway
kartermdb is offline   Reply With Quote
Old 02-04-2007, 07:09 PM   #2662
Tech Master
 
curious mind's Avatar
 
Join Date: Apr 2005
Location: I never imagine it could be that GOOD!!!
Posts: 1,903
Trader Rating: 8 (100%+)
Default

Quote:
Originally Posted by kartermdb
More amp draw just means the motor is less efficient and will run hotter when geared the same. I tune my co's to pull about 6 amps after break in at 2 volts without a fan. i have found out that when the motor pulls less amps, you can actually gear up and have a faster car
same goes to me. i tune my motor and achieving a 5-6.5 amp draw at 2volts. I find it better specially in long flowing tracks. Temp is cooler even if i gear them for more RPM. base from my experience.
curious mind is offline   Reply With Quote
Old 02-05-2007, 02:25 AM   #2663
Tech Addict
 
Join Date: Apr 2005
Location: north-west Indiana
Posts: 749
Trader Rating: 18 (100%+)
Default

I am going to try and take a crack at this, I may be wrong but from my experience: I use amp draw to gear a motor. Lower amp draw=higher gearing, higher amp draw=lower gearing. When breaking in our motors at 2v w/o a breakin fan, they are unloaded. So they are spinning their maximum rpm's at whatever amperage. For tc's you want the amperage to be higher because they pull more amps than say a 1/12th scale. The reason being that if you look at amp steps on a dyno readout you will see that as the amp draw gets higher the rpm's get lower. So you want the motor to pull more amps at its maximum rpm. Giving you more rpm's out of the corners and such. At the end of a straight when your motor is only pulling 10 amps or so, with a motor that pulls 10 amps unloaded, you are getting maximum rpm's. With a motor that only pulls 6 amps unloaded you are not getting your maximum rpm's yet. However this is subjective. If your motor isn't efficient enough at higher amp draws then it will do you no good (it will rob you of power, causing you to draw more amps). With 1/12th scale however I look for less amp draw from my motors. Good range in my experience, tc: 8.5-9.5. 1/12: 6-7. Again, I may be wrong but this is what has worked for me.
trilerian is offline   Reply With Quote
Old 02-05-2007, 04:39 AM   #2664
Tech Elite
 
CRASH's Avatar
 
Join Date: Jan 2002
Posts: 2,715
Trader Rating: 26 (100%+)
Default

What do most of you guys run for brush/spring combination on a CO27?

I am using the Trinity Pro versions, just recut the comm and put in F-Brushes and using the springs that come with them. But I have heard and seen people using red/green, red/red, purple/purple etc...

Wanting a good overall combination of turque/hp and at least last 4-5 races.

Thanks,
CRASH is offline   Reply With Quote
Old 02-05-2007, 07:32 AM   #2665
Tech Lord
 
UN4RACING's Avatar
 
Join Date: Oct 2006
Location: MODIFIED!
Posts: 13,140
Trader Rating: 22 (100%+)
Default

Purple purple trinity springs. Reedy lay down cavity brushes. Trinity teflon shims.
For longer wear I had good luck with 767 purple, green. But it really didnt work inside, but work good out side.
Thats what I ran in the heart of america, except I ran slotted trinity brushes but I cant remember the #. My box stock FK04 TQd. The mains were rained out. But that mother was fast. QC2 speedo. Monster motor.

Last edited by UN4RACING; 02-05-2007 at 08:40 PM.
UN4RACING is offline   Reply With Quote
Old 02-05-2007, 09:18 AM   #2666
Tech Fanatic
 
Join Date: Feb 2004
Posts: 954
Trader Rating: 8 (90%+)
Default

Quote:
Originally Posted by CRASH
What do most of you guys run for brush/spring combination on a CO27?

I am using the Trinity Pro versions, just recut the comm and put in F-Brushes and using the springs that come with them. But I have heard and seen people using red/green, red/red, purple/purple etc...

Wanting a good overall combination of turque/hp and at least last 4-5 races.

Thanks,
I run a Purple +, Red - on a medium sized track and my car is very consistent with power the whole 5 mins.
Johnny Carey is offline   Reply With Quote
Old 02-05-2007, 07:48 PM   #2667
Tech Master
 
curious mind's Avatar
 
Join Date: Apr 2005
Location: I never imagine it could be that GOOD!!!
Posts: 1,903
Trader Rating: 8 (100%+)
Default

Quote:
Originally Posted by CRASH
What do most of you guys run for brush/spring combination on a CO27?

I am using the Trinity Pro versions, just recut the comm and put in F-Brushes and using the springs that come with them. But I have heard and seen people using red/green, red/red, purple/purple etc...

Wanting a good overall combination of turque/hp and at least last 4-5 races.

Thanks,
Red/green with trinity 4499 brushes works with 767 also. Track layout with lots of cornerring with a long back straight stretch. good burns, with regulated temp of 130-154 deg. Tried it also with all red, same brushes though a little less punch on exiting.
curious mind is offline   Reply With Quote
Old 02-05-2007, 09:45 PM   #2668
Tech Champion
 
Still Bill's Avatar
 
Join Date: Jan 2004
Location: Reno, NV
Posts: 7,237
Trader Rating: 12 (100%+)
Default

Hate to kill the topic; but, using my new Novak 13.5 motor (with a sintered rotor), I continually equal my best lap times (achieved with a "killer" EA stock motor) over-and-over without any rebuilds. Gotta think that NorCal tracks are leading the way towards BL.

And ROAR needs to listen...Because our Region 12 carpet races will allow BL in Stock and 19T.

Stock brushed motors RIP. OK to flame me; but, the future is HERE.
__________________
Constantly evolving CRC WGT and WGT-R/T...Carpet & Asphalt...All thanks to Team CRC.

And a pair of Associated B6 buggies for turf and clay tracks.
Still Bill is offline   Reply With Quote
Old 02-05-2007, 10:35 PM   #2669
Tech Master
 
Tire Chunker's Avatar
 
Join Date: Feb 2005
Posts: 1,241
Trader Rating: 16 (100%+)
Default

Quote:
Originally Posted by Still Bill
Hate to kill the topic; but, using my new Novak 13.5 motor (with a sintered rotor), I continually equal my best lap times (achieved with a "killer" EA stock motor) over-and-over without any rebuilds. Gotta think that NorCal tracks are leading the way towards BL.

And ROAR needs to listen...Because our Region 12 carpet races will allow BL in Stock and 19T.

Stock brushed motors RIP. OK to flame me; but, the future is HERE.

More RTR mentality. We are in this hobby to build tinker ect...........

I have nothing against brushless, but I think it is a joke to run brushed with brushless in stock. Let the two stay separate and let us choose which to run.

RTR lets race a faster brushless against stock brushed motors, that sounds fair for all of the racers..........NOT.
Tire Chunker is offline   Reply With Quote
Old 02-05-2007, 10:54 PM   #2670
Suspended
 
Join Date: Nov 2006
Location: Costa Mesa
Posts: 408
Default

Quote:
Originally Posted by trilerian
I am going to try and take a crack at this, I may be wrong but from my experience: I use amp draw to gear a motor. Lower amp draw=higher gearing, higher amp draw=lower gearing. When breaking in our motors at 2v w/o a breakin fan, they are unloaded. So they are spinning their maximum rpm's at whatever amperage. For tc's you want the amperage to be higher because they pull more amps than say a 1/12th scale. The reason being that if you look at amp steps on a dyno readout you will see that as the amp draw gets higher the rpm's get lower. So you want the motor to pull more amps at its maximum rpm. Giving you more rpm's out of the corners and such. At the end of a straight when your motor is only pulling 10 amps or so, with a motor that pulls 10 amps unloaded, you are getting maximum rpm's. With a motor that only pulls 6 amps unloaded you are not getting your maximum rpm's yet. However this is subjective. If your motor isn't efficient enough at higher amp draws then it will do you no good (it will rob you of power, causing you to draw more amps). With 1/12th scale however I look for less amp draw from my motors. Good range in my experience, tc: 8.5-9.5. 1/12: 6-7. Again, I may be wrong but this is what has worked for me.

Of course your amp draws are higher 8 to 10 amps with heavy spring rates, the 12th are ALWAYS have less amp draw cause you dont put heavy springs on them..A motor that draws 2amps will run the same as one that pulls 10 ..its how you build them that makes the difference ..Spring rate will always change the amp draw of ANY motor.

Rule of thumb small track less spring rate, Big track more spring rate.. It might sound wrong but thats electric motors for ya...Bitter
CAlbrecht is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
19T Motor Forum Korey Harbke Electric On-Road 550 04-11-2009 08:27 AM
Stock motor sale !!!!CO27,P2k Pro, Monsters stock Marcos.J R/C Items: For Sale/Trade 36 06-27-2006 06:26 AM
Mod Motor forum Taz_S Electric On-Road 58 11-28-2003 12:58 AM
Stock Motor Forum JLMG1971 Electric On-Road 2 10-22-2002 03:07 AM
Stock Motor forum Taz_S Electric On-Road 62 09-14-2001 12:32 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 08:25 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net