Robi Dyno, How do you choose your best motor
#31
Tech Regular
Originally Posted by jeffb
John, Erock, those are pretty common numbers for the IB3800's and of the IP3800's latest batches.
Nice eh?
Nice eh?
so I can imagine the newer stuff is showing better numbers.
I know for a fact the IP cells are getting insane like over 530+ runtime at 30 amps. Pretty nice for a supposed 3600 cell since the IP3800 is really a Grepow 3600.
#32
Originally Posted by SA_Racer
I use the dos version with all features on ly computer running WinXP , you may have to select compatibilty mode if it gives you problems
#33
Tech Elite
iTrader: (27)
Jeff-yes, very nice.
erock1331"we run 4 min races
so is the calc right then 43.75 amps ?"
I would have to say yes. One thing that might inflate the number a little are practice laps (add these seconds to your race time), and letting the pack sit a few minutes before the final discharge is done (the pack will self discharge a bit). I imagine the motor would be pretty hot at this level. Have you guys used a temp gun on them. Anyway you should be looking for power watts near this level. Have a buddy do the same test for more verification. Also make sure you have a recent cycle of the T35 as the NiMh tend to loose some capacity with each cycle.
There was one guy at Reflex who was averaging 36 amps in a 6 cell touring car on high grip asphalt.
I used to tune my stock truck (6 cell) on a high grip track for best power right at 45 amps for best lap times, although my average amp draw was much lower.
erock1331"we run 4 min races
so is the calc right then 43.75 amps ?"
I would have to say yes. One thing that might inflate the number a little are practice laps (add these seconds to your race time), and letting the pack sit a few minutes before the final discharge is done (the pack will self discharge a bit). I imagine the motor would be pretty hot at this level. Have you guys used a temp gun on them. Anyway you should be looking for power watts near this level. Have a buddy do the same test for more verification. Also make sure you have a recent cycle of the T35 as the NiMh tend to loose some capacity with each cycle.
There was one guy at Reflex who was averaging 36 amps in a 6 cell touring car on high grip asphalt.
I used to tune my stock truck (6 cell) on a high grip track for best power right at 45 amps for best lap times, although my average amp draw was much lower.
Last edited by John Stranahan; 01-06-2006 at 06:31 AM.
#34
Tech Regular
Originally Posted by John Stranahan
erock1331"we run 4 min races
so is the calc right then 43.75 amps ?"
I would have to say yes. One thing that might inflate the number a little are practice laps (add these seconds to your race time), and letting the pack sit a few minutes before the final discharge is done (the pack will self discharge a bit). I imagine the motor would be pretty hot at this level. Have you guys used a temp gun on them. Anyway you should be looking for power watts near this level. Have a buddy do the same test for more verification. Also make sure you have a recent cycle of the T35 as the NiMh tend to loose some capacity with each cycle.
so is the calc right then 43.75 amps ?"
I would have to say yes. One thing that might inflate the number a little are practice laps (add these seconds to your race time), and letting the pack sit a few minutes before the final discharge is done (the pack will self discharge a bit). I imagine the motor would be pretty hot at this level. Have you guys used a temp gun on them. Anyway you should be looking for power watts near this level. Have a buddy do the same test for more verification. Also make sure you have a recent cycle of the T35 as the NiMh tend to loose some capacity with each cycle.
Actually my packs are pretty dead on for runtime each cycle. I cycle my packs about once every 2 weeks. And they are always 401-414 sec runtime and I always average about 95-105 seconds coming off on the track so I figure we average a normal pack usage of 300 seconds.
Motor temp is around 115-130 degrees
#35
Tech Regular
In stock we always used 18-26 amps on the robi to test, but if the math is correct then it appears our stockers are pulling more like an average of 27 amps.
on our banked track a runtime pack of 385 comes off with around 195 seconds. So we use about 190 seconds of the pack.
190 x 35 = 6650 / 240 sec-- 27.70 amps
Maybe we should bump up the ave amp calc too look at 23-33 range ?
What do you think?
on our banked track a runtime pack of 385 comes off with around 195 seconds. So we use about 190 seconds of the pack.
190 x 35 = 6650 / 240 sec-- 27.70 amps
Maybe we should bump up the ave amp calc too look at 23-33 range ?
What do you think?
#36
Originally Posted by erock1331
In stock we always used 18-26 amps on the robi to test, but if the math is correct then it appears our stockers are pulling more like an average of 27 amps.
on our banked track a runtime pack of 385 comes off with around 195 seconds. So we use about 190 seconds of the pack.
190 x 35 = 6650 / 240 sec-- 27.70 amps
Maybe we should bump up the ave amp calc too look at 23-33 range ?
What do you think?
on our banked track a runtime pack of 385 comes off with around 195 seconds. So we use about 190 seconds of the pack.
190 x 35 = 6650 / 240 sec-- 27.70 amps
Maybe we should bump up the ave amp calc too look at 23-33 range ?
What do you think?
till later
#38
Originally Posted by erock1331
In stock we always used 18-26 amps on the robi to test, but if the math is correct then it appears our stockers are pulling more like an average of 27 amps.
on our banked track a runtime pack of 385 comes off with around 195 seconds. So we use about 190 seconds of the pack.
190 x 35 = 6650 / 240 sec-- 27.70 amps
Maybe we should bump up the ave amp calc too look at 23-33 range ?
What do you think?
on our banked track a runtime pack of 385 comes off with around 195 seconds. So we use about 190 seconds of the pack.
190 x 35 = 6650 / 240 sec-- 27.70 amps
Maybe we should bump up the ave amp calc too look at 23-33 range ?
What do you think?
2/3rds of 26 is 17.3 amps so I round it up to 18 amps 26-18=8 and 26+8=34
so I figure a good range is perhaps from 18 to 34 amps (I know very un-scientific) But I had to decide on an upper limit and 34 sounds like a fair value. The problem I have with this is that the range is probably to broad so I narrowed it by 1 on each end so I set my range to be 19 to 33 amps.
My favorite motors produce around 110 watts in this range and I have found that they are screamers on the track. I also found that going below 106 watts equates to having an average motor on the track.
Also based on this I think one should try tune a motor for max power round the 30A mark
Perhaps you guys can give me your views on what you think could be a good range for measurement, I Believe it is now important to get a broad range for good power delivery at both low speed acceleration as well as on the high speed sections.