R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 06-19-2013, 01:12 PM   #1
Tech Regular
 
Join Date: Nov 2011
Posts: 303
Default Revtech 17.5T stock spec temp

I just recived a Revtech 17.5T stock spec, and I run it in blinky mode, and with a FRD 3.957.

I just tested it at our track, small and narrow and in 5 minuts, I reached the temp 163F. Is this to much for this motor ?
Shock Tower is offline   Reply With Quote
Old 06-19-2013, 01:26 PM   #2
Tech Elite
 
mkiiina's Avatar
 
Join Date: Jul 2007
Location: Frisco TX
Posts: 2,334
Trader Rating: 69 (100%+)
Default

Seems ok (maybe a little warm). I can swing the temps on my motor by 15+ degrees based on how im driving (hard on the brakes into a corner vs taking a better line and carrying speed).

What's you esc temp at? What's you motor timing at? Ambient temps/fan on the motor?
mkiiina is offline   Reply With Quote
Old 06-19-2013, 01:42 PM   #3
Tech Regular
 
Join Date: Nov 2011
Posts: 303
Default

Quote:
Originally Posted by mkiiina View Post
Seems ok (maybe a little warm). I can swing the temps on my motor by 15+ degrees based on how im driving (hard on the brakes into a corner vs taking a better line and carrying speed).

What's you esc temp at? What's you motor timing at? Ambient temps/fan on the motor?
I am not sure on the esc temp, has a Tekin RS PRO, and didn't check the temp. The endball timing is as it was from the factory, and our ambient temp is approx 68F, and I have a LRP radical fan mounted on it.

I switched from a Novak Ballistic, where I ran approx 3.7FDR, and the temp was almost the same, but I thought that I had more speed on that one.
Shock Tower is offline   Reply With Quote
Old 06-19-2013, 02:20 PM   #4
Tech Master
 
Join Date: Jun 2004
Location: SoCal
Posts: 1,099
Trader Rating: 6 (100%+)
Default

That's temp is fine. When my motor is at its fastest, it'll be around 180.
__________________
Minh Nguyen
[Maclan Racing] [Xpert Servos]
trigger is offline   Reply With Quote
Old 06-19-2013, 02:43 PM   #5
Suspended
 
Join Date: Feb 2011
Posts: 6,240
Trader Rating: 1 (100%+)
Default

Was the Novak ballistic with a 12.3mm rotor or a 12.5mm like the Revtech.... Revtech motors like heat....
bertrandsv87 is offline   Reply With Quote
Old 06-19-2013, 03:53 PM   #6
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,081
Trader Rating: 52 (100%+)
Default

Where is the endbell timing set on the motor? Is this in a TC? If you left the timing set at the 0 mark on the endbell, and are geared at 1:3.9, you are likely under geared, and the motor is spending a lot of time wound up really high.

I would probably start with the endbell timing all the way up, geared around 3.85, and go from there.

And no, 180 is not where the motor will be best at. Don't gear for temps, gear for lap times, and then make sure you aren't going over your max temp, which is ~170s. If your best laptimes/performance comes from gearing that brings you up to only 120 degrees, then that's great. You wouldn't then gear up just to get more heat, as your lap times will then suffer.
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -
Cpt.America is offline   Reply With Quote
Old 06-19-2013, 03:55 PM   #7
Tech Rookie
 
Join Date: Feb 2013
Posts: 16
Trader Rating: 1 (100%+)
Default

Most guys I race with try not to run the motor more than about ~180
DanDanDan3 is offline   Reply With Quote
Old 06-19-2013, 03:59 PM   #8
Tech Fanatic
 
Join Date: Sep 2006
Location: Salem
Posts: 999
Trader Rating: 17 (100%+)
Default

Where do you guys get 180.. he said 160. Turn down the timing just a smidge. Pretty close though IMO.
__________________
T.O.P Racing USA

"This T-bird will put a spell on you"
Mr.A Morris is offline   Reply With Quote
Old 06-20-2013, 09:00 AM   #9
Super Moderator
 
Cpt.America's Avatar
R/C Tech Elite Subscriber
 
Join Date: Mar 2009
Location: Washington State
Posts: 11,081
Trader Rating: 52 (100%+)
Default

Quote:
Originally Posted by Mr.A Morris View Post
Where do you guys get 180.. he said 160. Turn down the timing just a smidge. Pretty close though IMO.
We were referring to trigger, post #4
__________________
A big thanks to my sponsors:
- Fantom Racing - www.fantomracing.com -
- Fusion Graphix- www.fusiongraphix.com -
- RCSpecialties -
Cpt.America is offline   Reply With Quote
Old 06-20-2013, 01:02 PM   #10
Tech Regular
 
Join Date: Nov 2011
Posts: 303
Default

Quote:
Originally Posted by Cpt.America View Post
Where is the endbell timing set on the motor? Is this in a TC? If you left the timing set at the 0 mark on the endbell, and are geared at 1:3.9, you are likely under geared, and the motor is spending a lot of time wound up really high.

I would probably start with the endbell timing all the way up, geared around 3.85, and go from there.

And no, 180 is not where the motor will be best at. Don't gear for temps, gear for lap times, and then make sure you aren't going over your max temp, which is ~170s. If your best laptimes/performance comes from gearing that brings you up to only 120 degrees, then that's great. You wouldn't then gear up just to get more heat, as your lap times will then suffer.
My endbell timing is set at 0 as from the factory.

What do you mean by 'start with the endbell timing all the way up' ?? Do you mean +or - from 0 deg.

I am running TC carpet.

Revtech 17.5T stock spec temp-image.jpg
Shock Tower is offline   Reply With Quote
Old 06-20-2013, 01:11 PM   #11
Tech Champion
 
John Tag's Avatar
 
Join Date: May 2004
Location: Huntersville, NC
Posts: 8,925
Trader Rating: 42 (100%+)
Default

What size is your Track ?.. that is a key factor in timing and gearing starting point.
__________________
www.express-motorsports.net for all your motor needs
Multi time National Champions,Reedy Champs,Vegas Champs,Birds, Champs,[email protected]

Team Associated-Express Motorsports-Trinity-Reflex Racing-A Main Hobbies-ProtekRC
John Tag is offline   Reply With Quote
Old 06-20-2013, 01:38 PM   #12
Tech Regular
 
Join Date: Nov 2011
Posts: 303
Default

Quote:
Originally Posted by John Tag View Post
What size is your Track ?.. that is a key factor in timing and gearing starting point.
I drive on 2 different tracks. The common one is very narrow and short, think the straight is only about 50ft.

i haven't tried the Revtech on the other big track, where the straight is about 80-90ft i think.
Shock Tower is offline   Reply With Quote
Old 06-20-2013, 01:55 PM   #13
Tech Champion
 
John Tag's Avatar
 
Join Date: May 2004
Location: Huntersville, NC
Posts: 8,925
Trader Rating: 42 (100%+)
Default

Quote:
Originally Posted by Shock Tower View Post
I drive on 2 different tracks. The common one is very narrow and short, think the straight is only about 50ft.

i haven't tried the Revtech on the other big track, where the straight is about 80-90ft i think.
Short track I would start motor at 2 line before full timing on + side. FDR about 4.15-4.25. Other track I would start 1 line before full timing and FDR of about 3.85-3.95. Always make first run short 3 minutes and check temps.

What you are looking for is a good balance of power from infield to main straight. A good FDR will be when car pulls strong for 3/4 the longest straight away. If your pulling past 3/4 down the main straight your pulling too much gear. Go out in practice and run alone, don't get into a race in hot laps that's what heats and mains are for. Focus on where car is peaking out rpm wise and that should yield point you need to be.

They above should yield good temps and good power. Watch lap times during heats if you see lots of fade adjust gearing as needed.

Hope this helps some..
__________________
www.express-motorsports.net for all your motor needs
Multi time National Champions,Reedy Champs,Vegas Champs,Birds, Champs,[email protected]

Team Associated-Express Motorsports-Trinity-Reflex Racing-A Main Hobbies-ProtekRC
John Tag is offline   Reply With Quote
Old 06-20-2013, 02:07 PM   #14
Tech Regular
 
Join Date: Nov 2011
Posts: 303
Default

Quote:
Originally Posted by John Tag View Post
Short track I would start motor at 2 line before full timing on + side. FDR about 4.15-4.25. Other track I would start 1 line before full timing and FDR of about 3.85-3.95. Always make first run short 3 minutes and check temps.

What you are looking for is a good balance of power from infield to main straight. A good FDR will be when car pulls strong for 3/4 the longest straight away. If your pulling past 3/4 down the main straight your pulling too much gear. Go out in practice and run alone, don't get into a race in hot laps that's what heats and mains are for. Focus on where car is peaking out rpm wise and that should yield point you need to be.

They above should yield good temps and good power. Watch lap times during heats if you see lots of fade adjust gearing as needed.

Hope this helps some..
Hi John.

So If I un­rstand you right, then on the short track, you will increase the timing, but go down on gearing, and on the large track, you will keep the gearing around the same as i have now, and then almost apply full endbell timing. Will the last surgestion not only give me more heat ? Low gearing and high endbell timing ?

Mayby i am a rookie on this field...
Shock Tower is offline   Reply With Quote
Old 06-20-2013, 02:15 PM   #15
Tech Champion
 
John Tag's Avatar
 
Join Date: May 2004
Location: Huntersville, NC
Posts: 8,925
Trader Rating: 42 (100%+)
Default

Quote:
Originally Posted by Shock Tower View Post
Hi John.

So If I un­rstand you right, then on the short track, you will increase the timing, but go down on gearing, and on the large track, you will keep the gearing around the same as i have now, and then almost apply full endbell timing. Will the last surgestion not only give me more heat ? Low gearing and high endbell timing ?

Mayby i am a rookie on this field...
Short track 2 lines before full timing is lower timing than 1 line before full timing for larger track.

For the bigger track you will be adding about 2 more teeth to pinion size and 1 more line of timing.

Timing you have now is more suited for Ramming/open speed control.

Your current timing of "0" is prone to really rev up the motor some and can cause excess heat..almost like running a street car a mile down the road in 2nd gear unless you have a FDR matched to keep the RPMs lower.

The 2 settings I gave should get you really close to gear/timing needed.
__________________
www.express-motorsports.net for all your motor needs
Multi time National Champions,Reedy Champs,Vegas Champs,Birds, Champs,[email protected]

Team Associated-Express Motorsports-Trinity-Reflex Racing-A Main Hobbies-ProtekRC
John Tag is offline   Reply With Quote
Reply



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 08:28 AM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net