4LikesViper RC -
05-09-2013 | 11:13 AM
#7820
Tech Adept
iTrader: (4)
Joined: Mar 2013
Posts: 191
Originally Posted by godofcable
did you have a solid N light, and F-R were flashing? that would mean esc overheat
05-09-2013 | 11:17 AM
#7821
Let us know if it happens again
05-09-2013 | 11:39 AM
#7822
Tech Adept
iTrader: (10)
Joined: Sep 2011
Posts: 225
From: Glen Ellyn, IL
Look at it as two different settings. Boost gets you going its - the kick it the but to get you off the line and start the acceleration process. The top speed is the extra timing from when you kit that rpm point you designated earlier. Added in the Slew Rate - which is how hard the process gets kicked in the but.
Now if you make it too aggressive with a higher rpm motor -- it will start to act erratic -- which is probably what LosiPRACER is seeing in the Open Mode, because his profile probably has a good bit of Timing, and Slew Rate involved.
Many people hear boost and automatically think it has to be maximum setting to go the fastest. And that is not true. What you are trying to do is aid the natural acceleration you would get from the motor and the gear ratio. You never really want to run 30º timing or anything higher than 4 slew rate under most circumstances. You want to set it to give yourself that extra push.
Its a process to really set it up right - there is no plug and play set up. Because everyone's track is different, driving style different, "feel" for what they want is different. So its an experiment to find the right set up for your needs.
Now if you make it too aggressive with a higher rpm motor -- it will start to act erratic -- which is probably what LosiPRACER is seeing in the Open Mode, because his profile probably has a good bit of Timing, and Slew Rate involved.
Many people hear boost and automatically think it has to be maximum setting to go the fastest. And that is not true. What you are trying to do is aid the natural acceleration you would get from the motor and the gear ratio. You never really want to run 30º timing or anything higher than 4 slew rate under most circumstances. You want to set it to give yourself that extra push.
Its a process to really set it up right - there is no plug and play set up. Because everyone's track is different, driving style different, "feel" for what they want is different. So its an experiment to find the right set up for your needs.
Am I understanding this correctly?
Does the slew rate have a unit? In earlier versions of the firmware there was a unit established (degrees°/1,000 RPM). Now it is just a "Level".
The values I chose for the graph are arbitrary and not tied to any motor, track, vehicle combination. I am just trying to understand these parameters.
Other links I was referencing:
http://www.rctech.net/forum/11721911-post6709.html
http://www.rctech.net/forum/9888479-post3003.html
Thanks!
05-09-2013 | 05:38 PM
#7824
Steve - that's actually a very good representation of how it would look on graph. I was talking with some drivers today to try and find better ways to explain it, but thats actually a really good way to explain.
Technically Slew Rate does have a value, you were correct it was actually another variable in the old software, but we tried to simplify it in a55 because we felt it put the level of complications over the top - its easier to say 1-10 and leave the other settings to be complicated.
Thanks for the questions and the interest, the boost settings are ones that really have gone un-noticed by many but can make so much of a difference.
I was talking to a team driver today who added 15º of boost to a 1500kv 1/8 motor and was able to keep up with guys running 1900kv and 2100kv - so its not about putting in the highest levels is getting the right amount added.
Technically Slew Rate does have a value, you were correct it was actually another variable in the old software, but we tried to simplify it in a55 because we felt it put the level of complications over the top - its easier to say 1-10 and leave the other settings to be complicated.
Thanks for the questions and the interest, the boost settings are ones that really have gone un-noticed by many but can make so much of a difference.
I was talking to a team driver today who added 15º of boost to a 1500kv 1/8 motor and was able to keep up with guys running 1900kv and 2100kv - so its not about putting in the highest levels is getting the right amount added.
05-09-2013 | 05:40 PM
#7825
Boostem - it does sound a bit like a low voltage or weak cell issue. Its becoming more common with these high amp draw 4 pole motors we all crave. But also if the lights are flashing it did detect a temp overload, depending on the lights would show which one, reference the manual to get a better idea. And remember, internal temperatures of the esc can be higher than what you read on the case where the fan is blowing.
05-09-2013 | 07:45 PM
#7826
Tech Adept
iTrader: (10)
Joined: Sep 2011
Posts: 225
From: Glen Ellyn, IL
Steve - that's actually a very good representation of how it would look on graph. I was talking with some drivers today to try and find better ways to explain it, but thats actually a really good way to explain.
Technically Slew Rate does have a value, you were correct it was actually another variable in the old software, but we tried to simplify it in a55 because we felt it put the level of complications over the top - its easier to say 1-10 and leave the other settings to be complicated.
Thanks for the questions and the interest, the boost settings are ones that really have gone un-noticed by many but can make so much of a difference.
I was talking to a team driver today who added 15º of boost to a 1500kv 1/8 motor and was able to keep up with guys running 1900kv and 2100kv - so its not about putting in the highest levels is getting the right amount added.
Technically Slew Rate does have a value, you were correct it was actually another variable in the old software, but we tried to simplify it in a55 because we felt it put the level of complications over the top - its easier to say 1-10 and leave the other settings to be complicated.
Thanks for the questions and the interest, the boost settings are ones that really have gone un-noticed by many but can make so much of a difference.
I was talking to a team driver today who added 15º of boost to a 1500kv 1/8 motor and was able to keep up with guys running 1900kv and 2100kv - so its not about putting in the highest levels is getting the right amount added.
For a while I was running 2wd mod buggy (8.5T) in blinky mode with about 20° endbell timing. I took away the endbell timing, went down a tooth on the pinion and added about 10° acceleration boost, no TST, and the car felt so much better on a high bite indoor clay track. On the infield portions there was much more get up and go with plenty low end grunt to clear some larger jumps. And on the straight away it felt just as fast and reached full speed quicker. Before I added the boost it felt like it was accelerating on the whole straight away and never got to top speed. You are absolutely correct, adding the boost opened new doors and really helped my lap times out.
05-09-2013 | 08:45 PM
#7827
Thanks Steve, glad you like.
Boostem- one more note I saw the 3s question. We really only recommend the R39 motor with 3s, and probably need to gear down to handle the extra power. When ever trying 3s over 2s you have to be careful and watch the heat build up.
Boostem- one more note I saw the 3s question. We really only recommend the R39 motor with 3s, and probably need to gear down to handle the extra power. When ever trying 3s over 2s you have to be careful and watch the heat build up.
05-10-2013 | 07:03 AM
#7828
Tech Adept
iTrader: (4)
Joined: Mar 2013
Posts: 191
Boostem - it does sound a bit like a low voltage or weak cell issue. Its becoming more common with these high amp draw 4 pole motors we all crave. But also if the lights are flashing it did detect a temp overload, depending on the lights would show which one, reference the manual to get a better idea. And remember, internal temperatures of the esc can be higher than what you read on the case where the fan is blowing.
Originally Posted by nikos2002
Boostem- one more note I saw the 3s question. We really only recommend the R39 motor with 3s, and probably need to gear down to handle the extra power. When ever trying 3s over 2s you have to be careful and watch the heat build up.
05-10-2013 | 07:29 AM
#7829
Tech Master
iTrader: (21)
Joined: May 2009
Posts: 1,345
From my personal experience I would not use a 4-pole motor and/or 3S w/ a vtx10R. I tried it b/c the product description says it can and in about 3 minutes the esc stopped working. No smoke, no high temps, it just stopped. I sent it back and the nice Viper costumer service sent me a new one. It's just not worth it. Use the copper head or the vtx8 for the high output motors/batteries and save thh vtx10's for the 2-pole motors.
05-10-2013 | 04:30 PM
#7830
...Technically Slew Rate does have a value, you were correct it was actually another variable in the old software, but we tried to simplify it in a55 because we felt it put the level of complications over the top - its easier to say 1-10 and leave the other settings to be complicated...
Last edited by sapperc; 05-11-2013 at 06:15 AM. Reason: goofed