R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 01-25-2010, 11:05 AM   #11176
Regional Moderator
 
CarbonJoe's Avatar
 
Join Date: Jul 2006
Posts: 2,661
Default

Quote:
Originally Posted by rcterp View Post
I'd check a couple different things:

-is your neutral drifting therefore you're not actually hitting full throttle?
-what's the voltage on your main battery at the end of the run?
Doubtful that the neutral is drifting. Same radio works fine with rubber and foam TCs both running RS Pros, both with same basic settings, neither of which suffer from this issue.

Voltage (as read back by the charger) is 3.8v immediately after a run. Pack(s) take between 1900 and 2100 mAh upon recharge.
__________________
*** The Gate - Celebrating 8 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Old 01-25-2010, 11:08 AM   #11177
Regional Moderator
 
CarbonJoe's Avatar
 
Join Date: Jul 2006
Posts: 2,661
Default

Quote:
Originally Posted by theisgroup View Post
you got too much turbo, timing and too short of a delay. the "easy" button is not to just max everything out.
If the motor isn't fading due to heat, why the drop off? If the settings aren't right, why would it run great for the first 5 minutes? I could understand if the motor was above 180 degrees, but not 105 - 115 degrees.
__________________
*** The Gate - Celebrating 8 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Old 01-25-2010, 11:08 AM   #11178
Tech Master
 
Magnet Top's Avatar
 
Join Date: Dec 2008
Location: Seattle
Posts: 1,964
Trader Rating: 4 (100%+)
Default

How much are you putting back into your battery ?

And no voltage cuttoff ... Hmmm.

Still getting full throttle turbo after 8 min ??

What is your temp at 5 minutes ?




Quote:
Originally Posted by CarbonJoe View Post
Cross posted from the 1s LiPo thread, since this one gets a lot more traffic.

OK, here is a weird problem...

1/12 scale, Tekin RS Pro V203, 1s LiPo, voltage booster 17.5 Duo 1 motor. Zero degree timing on motor, max boost, max turbo, 0.3 delay, default start and end RPM, no voltage cutoff, neutral 10, brake strength 100, drag brake 5, rollout 3.10 inches.

Car runs great for about 5 minutes, then falls on it's face badly, slower by around 3 seconds per lap (10.5 fast lap, to 13.5 seconds at the end). Motor is only 106 degrees after entire 8 minutes. ESC was cold, so no chance of it overheating. Case, as well as posts weren't even warm.

Swap out motor to brand new 17.5 Duo 2, try different battery, different voltage booster. Same thing. Motor is only 115 degrees after 8 minutes. Not losing control (like if regulator was dropping out).

Otherwise, car was very fast. Leading race, had a lap up over 3rd place, but he was able to make it up, pass me, and finished 1 lap up over me. I can see dropping off a few tenths, but not 30%.

Any ideas?
Magnet Top is offline   Reply With Quote
Old 01-25-2010, 11:14 AM   #11179
Regional Moderator
 
CarbonJoe's Avatar
 
Join Date: Jul 2006
Posts: 2,661
Default

Quote:
Originally Posted by Magnet Top View Post
How much are you putting back into your battery ?

And no voltage cuttoff ... Hmmm, you know you can harm your lipo that way ?

Still getting full throttle turbo after 8 min ??
Putting 1900 - 2100 mAh back into the ThunderPower 5000 or Speedzone 5200. No chance of over discharging these packs in 8 minutes with a 17.5. I'm not even using 50% of the capacity. Pack reads back as 3.8v when put back on the charger immediately after the run.
__________________
*** The Gate - Celebrating 8 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Old 01-25-2010, 11:20 AM   #11180
Tech Master
 
rcterp's Avatar
 
Join Date: Oct 2008
Location: No mans land.
Posts: 1,032
Trader Rating: 35 (100%+)
Default

Quote:
Originally Posted by CarbonJoe View Post
Doubtful that the neutral is drifting. Same radio works fine with rubber and foam TCs both running RS Pros, both with same basic settings, neither of which suffer from this issue.

Voltage (as read back by the charger) is 3.8v immediately after a run. Pack(s) take between 1900 and 2100 mAh upon recharge.
-check (kinda, I'd switch receivers out with one you know is perfect just to be sure)
-check

Maybe do a master reset on the speedo and recalibrate (good chance you've tried this).......
__________________
Φ
Glitter Lidz - "My driving doesn't shine but my lid does!!"
rcterp is offline   Reply With Quote
Old 01-25-2010, 11:21 AM   #11181
Tech Adept
 
Join Date: Jan 2008
Posts: 176
Default

Confused!!!

Do the RPM settings affect the timing etc even if the turbo is not being used?

If so what should the start and max RPM range be for a Speed Passion 13.5 ver.3?

Medium tractio carpet with a 30m straight I was geared at about 5ish?

Thanks for your advice in advance
008-Racer is offline   Reply With Quote
Old 01-25-2010, 11:29 AM   #11182
Tech Adept
 
Join Date: Aug 2005
Location: Perth
Posts: 103
Trader Rating: 2 (100%+)
Default

Has anyone tried Barry Bakers setup using a 13.5 Redline, I know he was using a checkpoint but wondered how it would go with the Redline.
Toolmannz2 is offline   Reply With Quote
Old 01-25-2010, 11:37 AM   #11183
Tech Master
 
Magnet Top's Avatar
 
Join Date: Dec 2008
Location: Seattle
Posts: 1,964
Trader Rating: 4 (100%+)
Default

and you've done the EPA trick when caibrating ?
Check your motor temp before it slows down ( 5 minutes in )
Maybe try backing off from max everything to 50 and 10 and Lower the ramp rate one notch ? Or have you tried everything above ?

Just trying to help...


Quote:
Originally Posted by CarbonJoe View Post
Putting 1900 - 2100 mAh back into the ThunderPower 5000 or Speedzone 5200. No chance of over discharging these packs in 8 minutes with a 17.5. I'm not even using 50% of the capacity. Pack reads back as 3.8v when put back on the charger immediately after the run.
Magnet Top is offline   Reply With Quote
Old 01-25-2010, 11:38 AM   #11184
Tech Elite
 
Join Date: Mar 2005
Location: Michigan
Posts: 3,140
Trader Rating: 114 (100%+)
Questions??

I know this has already been answered... But I cannot find it...


Is the 12 degree mark on the Tekin 17.5 actually 12 degrees? Or something else?
Chris Furman is offline   Reply With Quote
Old 01-25-2010, 11:45 AM   #11185
Team Tekin
 
Randy_Pike's Avatar
 
Join Date: Nov 2007
Location: Norcal
Posts: 9,702
Trader Rating: 6 (100%+)
Send a message via Yahoo to Randy_Pike
Default

For all intensive purposes it's 12. We don't discuss the "early read" that we used to anymore.

Barry's 13.5 setup works killer on our Redline motor.
__________________
"Things may come to those who wait, but only the things left by those who hustle." Abraham Lincoln

Tekin,Protek,A-Main Hobbies,JConcepts,Avid RC,Yokomo,MIP,SikLidz,FactoryRC, www.randypikerc.com
Randy_Pike is offline   Reply With Quote
Old 01-25-2010, 11:46 AM   #11186
Tech Champion
 
morris's Avatar
 
Join Date: Nov 2005
Location: jersey shore pa
Posts: 5,564
Trader Rating: 40 (100%+)
Default

Quote:
Originally Posted by Randy_Pike View Post
I don't care for the 3.0 ramp rate and the .2 delay for your turbo. That's too much timing too fast. I know this to be true because your motor temps are higher than they should be for this software/setup. That on top of the issue of "fade" is telling me this is the case.

Since your'e running TC I would like you to try this setup:

Start rpm of 5096
End rpm of 16,000
Timing boost set to 45
Motor timing set to 10
No turbo to start out, you MUST find the right gearing first.

How big is this track? How long is the straight away? What motor are you running? Where are you geared?
track is like 75x70.50-55 ft straight.
geared at a 6.75 with an orion 13.5 motor
what ramp is likeable
__________________
AE/VIPER/XPERT/DIRTCHEAPRC.COM/JCONCEPTS
A big thx to all the tracks that I race at:cause if it wasnt for these guys..we wouldnt have a place to race our r/c cars!!!
morris is offline   Reply With Quote
Old 01-25-2010, 11:47 AM   #11187
Tech Lord
 
wingracer's Avatar
 
Join Date: Nov 2007
Posts: 12,861
Trader Rating: 24 (100%+)
Default

CarbonJoe, some people doubt me when I say this and some have even blasted me for it (in other threads) but seriously, try a good receiver pack and see if that solves the problem.

A guy at the local track had the same issue because his 50mah receiver pack would only last about half the run. After that he still had perfect control, but laptimes fell off dramatically.

I had the same thing happen to me with a friends car when a wire on the receiver pack broke.

If the booster can't keep up with demand after main pack voltage falls off a bit, I would think the same thing could happen.
__________________
Sean. Certified speed crazed mowron.
Team Shepherd USA
www.ashfordhobby.com
wingracer is offline   Reply With Quote
Old 01-25-2010, 11:52 AM   #11188
Team Tekin
 
Randy_Pike's Avatar
 
Join Date: Nov 2007
Location: Norcal
Posts: 9,702
Trader Rating: 6 (100%+)
Send a message via Yahoo to Randy_Pike
Default

Quote:
Originally Posted by morris View Post
track is like 75x70.50-55 ft straight.
geared at a 6.75 with an orion 13.5 motor
what ramp is likeable
I would not expect to use ANY turbo on a track that small.
__________________
"Things may come to those who wait, but only the things left by those who hustle." Abraham Lincoln

Tekin,Protek,A-Main Hobbies,JConcepts,Avid RC,Yokomo,MIP,SikLidz,FactoryRC, www.randypikerc.com
Randy_Pike is offline   Reply With Quote
Old 01-25-2010, 11:54 AM   #11189
Tech Elite
 
joeymdz's Avatar
 
Join Date: Jul 2009
Location: Oreogan
Posts: 2,993
Trader Rating: 13 (100%+)
Send a message via MSN to joeymdz
Default

Quote:
Originally Posted by Magnet Top View Post
and you've done the EPA trick when caibrating ?
Check your motor temp before it slows down ( 5 minutes in )
Maybe try backing off from max everything to 50 and 10 and Lower the ramp rate one notch ? Or have you tried everything above ?

Just trying to help...


second that idea!

also what size track are you running on? i can understand running max timimg (because i do) but running max boost as well? the track i run on is 74x36 and my settings are:

WGT 1s 13.5 duo
50 drag
4 tp
max timing
7 turbo
.2 delay
7001 end
2437 start
3 ramp
temps 148 (134 without drag)

so far i have the current track record and managed the quickest lap (and fade is very minimal)

others at the track are running what magnet top mentioned above and they are VERY fast as well.
__________________
RC Plus*McKune Designs*NW Hobbies*Premier RC Raceways*Daves Tracks
joeymdz is offline   Reply With Quote
Old 01-25-2010, 12:06 PM   #11190
Regional Moderator
 
CarbonJoe's Avatar
 
Join Date: Jul 2006
Posts: 2,661
Default

I'll try some of these suggestions at practice Wednesday. I'd like to understand *why* this is happening. I also have an SMC Rx pack that I'll try.
__________________
*** The Gate - Celebrating 8 years at the same location ***
The difference between genius and stupidity is that genius has its limits. - Albert Einstein
Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car
CarbonJoe is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tekin Redline RS Sensored ESC and motors, opinions for offroad? Cain Electric Off-Road 4230 06-07-2015 04:38 PM
Sensored vs. Sensorless lemansracer Electric On-Road 71 02-14-2009 03:19 AM
New Tekin Redline Sensored Motors are Roar Legal! Randy_Pike Electric On-Road 3 08-05-2008 02:08 AM
Tekin Redline Sensored 10.5 HUCKMAN Electric On-Road 6 07-15-2008 08:50 PM
sensored vs sensorless bprocket Rookie Zone 5 05-16-2008 09:38 AM


Tags
v203, vegas 2.0


Currently Active Users Viewing This Thread: 2 (0 members and 2 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 01:57 PM.


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