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Old 02-23-2009, 07:20 AM   #15016
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Originally Posted by teeforb View Post
what is the individual voltage of your lipo pack once the LVC kicks in and when it's fully charged? it should be around 3.2 to 3v fully discharged and around 4.2v fully charged. it sounds like it is either your battery or charger. i think your system is okay. 3100mah / 10 mins is 310 mah/min. that sounds about right for a truggy. ur ESC and motor is good. it's either ur battery or charger...
I'll double check the voltage with a volt meter, but the charger reads 16.8 volts on all three packs when they are fully charged

I just tried to charge them and none of them will charge. I also tried charging some other lipos that I have, and they won't charge either so I guess i'll be buying a new charger today. Btw all the packs read 14.07,14.23,and 12.76. I dont know why the last one is so low
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Old 02-23-2009, 07:59 AM   #15017
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Originally Posted by rc13 View Post
ill post a video if it will help you guys diagnose my problem
Well here it is anyway
http://www.youtube.com/watch?v=1F7Rtxsktkc
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Old 02-23-2009, 08:04 AM   #15018
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Originally Posted by jhautz View Post
6s 5000 is only 50% more energy than 4s 5000. If you are only getting 10 minutes on the 4s 5000 I wouldnt expect more than 50% more runtime with a 6s 5000 setup. Maybe slightly more for some minor efficiency gains, but certainly no where near the 30/45 minutes you are looking for.

If I were you Id look for a solid 15-20 minute setup and then plan a pack swap for the 30 minute race and a 2 swaps for the 45 minute race. Also.. Watch your motor temps during those extended runs. Ive seen motors that were running properly overheat when pushed for that long. A fan on the motor would seem like a good idea to me.
Thx for replying the 4s 5000 can last me a solid 15mins. The 6s 5000 can last me 30mins but like wat u said the motor may overheat even theres a fan.

I was thinking when i use the 6s 5000 i will change my motor to 1600kv, wat u think?
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Old 02-23-2009, 08:13 AM   #15019
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Looking for some optional "hop-up" accessories for Losi 1/8 E, could someone suggest a few sites that offer a good supply or a good product?

Thanks
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Old 02-23-2009, 08:46 AM   #15020
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A little more fuel for the fire on run time debates.

Both JHautz and I raced truggy yesterday and had some VERY EFFICIENT run times. The track had a very slight change since it was a trophy race. It was a little more technical and the lap times went from 21-22 seconds to about 24-25 seconds for a fast lap. The pro guys could used to run 14 laps consistently in a 5 minute qualifier and now 13 was the A main standard.

Prior to the change
, I would use up about 1500-1600 in my BUGGY after a 5 minute qualifier with 2-2.5 minutes of warm up laps. So approximately 7 minutes on the track or about 210 or so/mah per minute.

After the Change: I ran my new 8t 2.0 TRUGGY yesterday with the 1515 2.5d/5s and I only put 1500 mah back. So my Truggy was running more efficient than my buggy prior to the change and to make it even better, JHautz ran his buggy too and only put 1300 back in the pack so the efficiency increase was across the board due to a slight change in the track.

So a very minor change on the track caused a fairly significant increase in run times on the order of about 18-20%.

Interesting.
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Old 02-23-2009, 08:49 AM   #15021
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Default NEED HELP!!!!

What would be the best combo for my losi 8ight 2.0. i am gonna go electric and have really no clue about electric combo's. what would be the best deal for my buck. i typically go out to the tracks and run my car not really into racing, just like having fun arounf the track, but i like going fast and roosting on ppl.
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Old 02-23-2009, 08:53 AM   #15022
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I thought I would put up some numbers from Saturday...

The car:
RC8
Neu 1512 2d
zippy-R 4800 4s
MMM

The temps:
Motor-135
esc-Fan never came on
Batt- 95 to 105
Air-~55

5 minute race @ 26 seconds a lap
2 warmup laps and then a 12 lap run
total run time: 7 minutes
Mah put back into pack...2500

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Old 02-23-2009, 09:17 AM   #15023
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Originally Posted by Edumakated View Post
A little more fuel for the fire on run time debates.

Both JHautz and I raced truggy yesterday and had some VERY EFFICIENT run times. The track had a very slight change since it was a trophy race. It was a little more technical and the lap times went from 21-22 seconds to about 24-25 seconds for a fast lap. The pro guys could used to run 14 laps consistently in a 5 minute qualifier and now 13 was the A main standard.

Prior to the change
, I would use up about 1500-1600 in my BUGGY after a 5 minute qualifier with 2-2.5 minutes of warm up laps. So approximately 7 minutes on the track or about 210 or so/mah per minute.

After the Change: I ran my new 8t 2.0 TRUGGY yesterday with the 1515 2.5d/5s and I only put 1500 mah back. So my Truggy was running more efficient than my buggy prior to the change and to make it even better, JHautz ran his buggy too and only put 1300 back in the pack so the efficiency increase was across the board due to a slight change in the track.

So a very minor change on the track caused a fairly significant increase in run times on the order of about 18-20%.

Interesting.
Nice update. I figured the change would use more power. Guess I was wrong.
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Old 02-23-2009, 09:23 AM   #15024
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Quote:
Originally Posted by Edumakated View Post
A little more fuel for the fire on run time debates.

Both JHautz and I raced truggy yesterday and had some VERY EFFICIENT run times. The track had a very slight change since it was a trophy race. It was a little more technical and the lap times went from 21-22 seconds to about 24-25 seconds for a fast lap. The pro guys could used to run 14 laps consistently in a 5 minute qualifier and now 13 was the A main standard.

Prior to the change
, I would use up about 1500-1600 in my BUGGY after a 5 minute qualifier with 2-2.5 minutes of warm up laps. So approximately 7 minutes on the track or about 210 or so/mah per minute.

After the Change: I ran my new 8t 2.0 TRUGGY yesterday with the 1515 2.5d/5s and I only put 1500 mah back. So my Truggy was running more efficient than my buggy prior to the change and to make it even better, JHautz ran his buggy too and only put 1300 back in the pack so the efficiency increase was across the board due to a slight change in the track.

So a very minor change on the track caused a fairly significant increase in run times on the order of about 18-20%.

Interesting.
Granted I have no idea where you race but it makes sense to me that it used less if the track got more technical. If the track is technical you arent grabbing handfulls of throttle because the track wont allow it. If its an easy/flowing higher speed track you are grabbing throttle. Just my .02
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Old 02-23-2009, 09:32 AM   #15025
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Originally Posted by SuperEk4 View Post
Thx for replying the 4s 5000 can last me a solid 15mins. The 6s 5000 can last me 30mins but like wat u said the motor may overheat even theres a fan.

I was thinking when i use the 6s 5000 i will change my motor to 1600kv, wat u think?
If 4s 5000 is lasting a solid 15 minutes, I still think it will be a bit of a stretch for you to get to 30 minutes on 6s 5000 and keep the same acceleration and top speed you are running now. It would be very very tight And yes, going to the lower kv motor on 6s would be very wise if you want to get as much run time gain as possible. If you plan to race on 6s I would even consider going down to a 1300-1400kv motor.
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Old 02-23-2009, 09:37 AM   #15026
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Originally Posted by Jube View Post
Granted I have no idea where you race but it makes sense to me that it used less if the track got more technical. If the track is technical you arent grabbing handfulls of throttle because the track wont allow it. If its an easy/flowing higher speed track you are grabbing throttle. Just my .02
Leisure Hours Raceway in Chicago.

I was more surprised as the change was not that significant from a length of track perspective and previous changes didn't affect runtime much as all. The section they changed is pretty slow though, so I can see how we are grabbing full acceleration like we used to. I just thought it was interesting to see up to 20% better run time with just a very minor change on the track.
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Old 02-23-2009, 09:39 AM   #15027
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Just goes to show that being easy on the throttle finger really helps runtimes!
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Old 02-23-2009, 09:44 AM   #15028
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edumaketd.....do you really do about 6 warmup laps? the next time you race why dont you and jhautz try this a couple of times. just put your cars on the track with no warmup at all and see what you pull strictly in racing mode.
then to take it further let one of those local pros wheel your cars for a round and see what happens.
my guess is your mah per minute will be higher than what you have experienced in the past, and when a high level driver takes your car and runs 2 laps faster than you do in the same 5 minutes your mah per minute will be much higher again.
also you and jhautz are running 5s so when you post numbers you need to remember to add about 20% to your mah per min to equate what a 4s system would get.
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Old 02-23-2009, 09:49 AM   #15029
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edumaketd.....do you really do about 6 warmup laps? the next time you race why dont you and jhautz try this a couple of times. just put your cars on the track with no warmup at all and see what you pull strictly in racing mode.
then to take it further let one of those local pros wheel your cars for a round and see what happens.
my guess is your mah per minute will be higher than what you have experienced in the past, and when a high level driver takes your car and runs 2 laps faster than you do in the same 5 minutes your mah per minute will be much higher again.
also you and jhautz are running 5s so when you post numbers you need to remember to add about 20% to your mah per min to equate what a 4s system would get.
Generally, I usually will turn a few laps and wait out the last 45 secs to a 1 minute of the warm up. I will measure it with no warm up next time. I would be curious to see what a really fast driver would turn with my car and how much mah they would burn. Most of the guys that are significantly faster than us though are die hard nitro guys and probably couldn't make it around the track with my car from a bad case of nitro finger though.
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Old 02-23-2009, 09:55 AM   #15030
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So you still feel for 6S on our track that the 3300 will make 20 mins? or should I shove the 3900 in there.
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