Drive frequency importance ?
#91
Tech Apprentice
I think some of you are missing the boat regarding drive frequency and acceleration. For example, V7.1 vs SR. They do have similar specs and the same drive frequency (3140hz), but you guys are overlooking the minimum drive factor. That is an adjustment that is used to give more or less punch at the hit of the throttle. Maybe LRP designed the SR to have more minimum drive to give it a stronger feel with weaker motors. I know LRPs V6, V7.1, SR, etc. have an adjustable throttle curve, but I think it's only used with the current limiter. If the plugs are removed then 100% of power output is available, but the minimum drive isn't changed. It must be programmed into the software of that line of speedos. That's why I like my Cyclone so much. Even though it requires a programming device it's really amazing how many things can be adjusted if need be. You may never use all of the settings, but they're available if you want them.
#92
Tech Fanatic
iTrader: (13)
Sorry reviving this thread.
Im just curious about drive frequencies of today's brushless systems.
I have a GTB2 X-Drive that has adjustable drive frequency.
It says, increasing the drive frequency makes it smoother:
Settings are in 1 to 10 but the Drive Freq started at 16khz and descended to 7khz
So if I set it to 10, the drive freq is at the lowest (7khz)?
Whats the effect in batt consumption and motor heat if I use a high freq or the low freq? Does a lower drive freq (7khz) yields more punch and acceleration?
For the experts, please elaborate.
Im just curious about drive frequencies of today's brushless systems.
I have a GTB2 X-Drive that has adjustable drive frequency.
It says, increasing the drive frequency makes it smoother:
Settings are in 1 to 10 but the Drive Freq started at 16khz and descended to 7khz
So if I set it to 10, the drive freq is at the lowest (7khz)?
Whats the effect in batt consumption and motor heat if I use a high freq or the low freq? Does a lower drive freq (7khz) yields more punch and acceleration?
For the experts, please elaborate.
#93
I have my gtb2 with Xdrive at 7khz with 15% minimum drive, and it really makes a huge difference when I run my radio throttle expo up to 30% and fwd acceleration at 40%... That's with a ballistic 17.5t motor at 3.65fdr and N timing... Nobody runs me down the straight when I accelerate at the same time... If novak had expanded their throttle profiles to include a convex profile also, it would be unbeatable....
#94
What transmitter do you use, as I'm not familiar with "fwd acceleration" setting?
Thanks
#96
The freq, between high and low, is the spread of the steps on the acceleration curve. Low freq is coarser or more stepped and high freq 16khz is smoother on a curve. I tend to run high freq as it also runs a little cooler for me mostly on the speed control, but the expo curve on the acceleration will definitely get you the punch out of the corners. I will run anywhere from 20 to 50, and have tried 75, but that didn't feel smooth to drive.
#98
I have a futaba 3pm fm radio, and I think their fwd acceleration is the same as throttle speed in other radios. Also, as far as I understand, the lower drive frequency(7khz) makes the speedo run cooler, but is harder on the motor; higher drive frequency is harder on the speedo, but easier on motors...
#99
Airflow, I think he means 20% to 50% throttle expo on the radio, not the speedo....
#100
I also run a shaft drive tc4 with a front spool, and the punch out of turns is a smudge faster than belt driven cars, when you combine that to all of the above....