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#6721
Tech Prophet
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Location: Far south suburbs of Chicago area
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if 1 motor has more rpm than the other, fixed fdr means the higher rpm motor will always be faster.
we did a fixed fdr at our club for a while. It worked for a while to even things out a bit but gradually guys started buying faster motors and those who doidn't were left in the dust.
Adjustable gearing plays to help those with slower motors.
we did a fixed fdr at our club for a while. It worked for a while to even things out a bit but gradually guys started buying faster motors and those who doidn't were left in the dust.
Adjustable gearing plays to help those with slower motors.
#6722
The best case is that you have the motor dyno graph showing where in the RPM range the motor makes the most power. Once you have that you adjust your FDR to keep the motor as close to that range as possible to get every ounce of usable power out of it.
#6723
Tech Prophet
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Don't know if I've ever seen a dyno graph for any RC motor. I'll have to look it to that before pick out replacement system.
#6724
Tech Elite
iTrader: (37)
The peak power occurs at approximately 1/2 of the free-running RPM. But don't concern yourself with this, as gearing to get that as an average RPM on track will almost always overheat the motor. Use an infrared thermometer and gear for temperature-- the accepted range is generally 140F to 160F.
#6725
Tech Prophet
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The peak power occurs about 1/2 of the free-running RPM. But don't concern yourself with this, as gearing to get that as an average RPM on track will almost always overheat the motor. Use an infrared thermometer and gear for temperature-- the accepted range is generally 140F to 160F.
Unfortunately it will be most likely 8 months before I race again. Though I'm trying to get myself to try carpet over winter. But that's very different from pavement.
Last edited by Billy Kelly; 09-29-2017 at 05:46 AM.
#6726
The peak power occurs at approximately 1/2 of the free-running RPM. But don't concern yourself with this, as gearing to get that as an average RPM on track will almost always overheat the motor. Use an infrared thermometer and gear for temperature-- the accepted range is generally 140F to 160F.
It's all just information for now. Think only once I got motor temps above 120 all summer. I've got a lot to learn over the winter. I know it's not all about motor. Car setup is what I really need to learn. By just improving driving I'm went from 3-4 seconds a lap off pace to about 1.3. It's that last second that been tough.
Unfortunately it will be most likely 8 months before I race again. Though I'm trying to get myself to try carpet over winter. But that's very different from pavement.
Unfortunately it will be most likely 8 months before I race again. Though I'm trying to get myself to try carpet over winter. But that's very different from pavement.
#6727
Billy, I like keeping tabs on you guys' progress too. And it for sure is progressing steadily. Next season you'll be even faster. During practice we'll do some focused adjustments and keep log of your lap times. Maybe we can get the group together and do some carpet practice days and I'll help you with setups. My carpet and asphalt setups are very close. The main differences are droop and swaybar settings.
And regarding motor and FDR, I run 3.7 on the T4 at our track. Last two race days were on the new Fantom V3 with factory timing to our track size. Man, it was a screamer! A 180+ degree screamer. Instead of changing the gearing, I turned down timing a little at a time and was able to get my lap times faster and tighter but with more control.
Anyway, keep it up, Buddy! You're doing great.
And regarding motor and FDR, I run 3.7 on the T4 at our track. Last two race days were on the new Fantom V3 with factory timing to our track size. Man, it was a screamer! A 180+ degree screamer. Instead of changing the gearing, I turned down timing a little at a time and was able to get my lap times faster and tighter but with more control.
Anyway, keep it up, Buddy! You're doing great.
#6728
Tech Prophet
iTrader: (9)
Join Date: Nov 2014
Location: Far south suburbs of Chicago area
Posts: 17,615
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Billy, I like keeping tabs on you guys' progress too. And it for sure is progressing steadily. Next season you'll be even faster. During practice we'll do some focused adjustments and keep log of your lap times. Maybe we can get the group together and do some carpet practice days and I'll help you with setups. My carpet and asphalt setups are very close. The main differences are droop and swaybar settings.
And regarding motor and FDR, I run 3.7 on the T4 at our track. Last two race days were on the new Fantom V3 with factory timing to our track size. Man, it was a screamer! A 180+ degree screamer. Instead of changing the gearing, I turned down timing a little at a time and was able to get my lap times faster and tighter but with more control.
Anyway, keep it up, Buddy! You're doing great.
And regarding motor and FDR, I run 3.7 on the T4 at our track. Last two race days were on the new Fantom V3 with factory timing to our track size. Man, it was a screamer! A 180+ degree screamer. Instead of changing the gearing, I turned down timing a little at a time and was able to get my lap times faster and tighter but with more control.
Anyway, keep it up, Buddy! You're doing great.
Windy City is adding another 21.5 class. That would help make the trip up worth the ride. I do hope to get there. Even if it's just practice.
My FDR was in the 3.7 last race also.
#6729
Tech Addict
don't worry about fdr at first, finding the timing setting where you get max power first. Once you have your motor performing at peak settings (every motor is different), them gear it with a 3 min run, check the temps. Over 150, gear back, under 120 gear up. The motor is already working at it's peak, the gear to your track so it always comes off around 140 ish so you are in a safe working range. My FDR might be different than yours depending on what motors we run. If your motor has lower rpm, you will gear up to say 3.6, my more has tons of rpm, I would gear back to around 3.9. We should both end up with temps around 140 and using the power our motors have in the most efficient way. Efficiency is how you get the most power out out of you motor.
#6730
don't worry about fdr at first, finding the timing setting where you get max power first. Once you have your motor performing at peak settings (every motor is different), them gear it with a 3 min run, check the temps. Over 150, gear back, under 120 gear up. The motor is already working at it's peak, the gear to your track so it always comes off around 140 ish so you are in a safe working range. My FDR might be different than yours depending on what motors we run. If your motor has lower rpm, you will gear up to say 3.6, my more has tons of rpm, I would gear back to around 3.9. We should both end up with temps around 140 and using the power our motors have in the most efficient way. Efficiency is how you get the most power out out of you motor.
#6731
#6733
#6734
Tech Prophet
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Join Date: Nov 2014
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#6735