SMC 4000/25C/3.7V single cell Hardcase pack.
#196
Tech Champion
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Thats just my take tho
#197
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Join Date: Jun 2008
Location: Conducting aggressive board meetings at my local track
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We wouldn't need rules to regulate how much speed and power we have if we would just back off the trigger.
#199
Tech Master
iTrader: (26)
Try this, it's a trick used sometimes in modified, for those times when the Rx browns out from voltage dips.
Place a single 1.2v 800mah or similar small cell in series with the red wire from the speed control to the Rx. Charge it as a single cell and when the speedo is turned on it will complete the circuit and put out ~3.7 volts from the internal bec +1.2 from the single cell in series, giving you about 4.9v and only 1 switch. Since there is only the single source connector to the Rx and not another in parrell the ESC will not even know the other cell is there and will not use it to run the motor or charge the battery
Place a single 1.2v 800mah or similar small cell in series with the red wire from the speed control to the Rx. Charge it as a single cell and when the speedo is turned on it will complete the circuit and put out ~3.7 volts from the internal bec +1.2 from the single cell in series, giving you about 4.9v and only 1 switch. Since there is only the single source connector to the Rx and not another in parrell the ESC will not even know the other cell is there and will not use it to run the motor or charge the battery
#201
Surely if you don't do it someone else will? The only way to slow the cars down is to limit capacity or motors in the rules. In the meantime wouldn't larger capacity speed up the switching process? I would think if you could do a 1 cell pack that can go head to head with 4 cell nimh with the hot motors more people will make the switch, then you can regulate from there.
Thats just my take tho
Thats just my take tho
#203
So far, the only known flawless way to run this 3.7V battery for the full 8 minutes without a performance dropoff is with a GTB, all wires intact on the rx plug, and the switch turned off --thanks KHoff. We'll try it this exact way with an LRP on Saturday and report the results (because last time we tried it, the switch was on and it dumped a lot from the Rx pack). We'll get one of the guys who is running a SpeedPassion to try it as well.
#204
Tech Addict
iTrader: (2)
hey guys i have been runnning the lipo pack for a couple of days now. it runs awesome. i used a ppd billet lipo tray thing and just cutted it down to fit into the car. i was just wondering what you guys have been gearing them at. i don't run alot of stock, we mainly run 10.5 so i don't have a 17.5 to base the speed of it.
thanks JB Catricala
thanks JB Catricala
#205
That's what I thought too, so that's why I posted it. I'm pretty sure we ran it with the switch on (LRP), but it seemed to run the same both ways. They did try it on Wednesday with the red wire out again, and this time it "worked", but did get the dumpy feeling after 5min.
So far, the only known flawless way to run this 3.7V battery for the full 8 minutes without a performance dropoff is with a GTB, all wires intact on the rx plug, and the switch turned off --thanks KHoff. We'll try it this exact way with an LRP on Saturday and report the results (because last time we tried it, the switch was on and it dumped a lot from the Rx pack). We'll get one of the guys who is running a SpeedPassion to try it as well.
So far, the only known flawless way to run this 3.7V battery for the full 8 minutes without a performance dropoff is with a GTB, all wires intact on the rx plug, and the switch turned off --thanks KHoff. We'll try it this exact way with an LRP on Saturday and report the results (because last time we tried it, the switch was on and it dumped a lot from the Rx pack). We'll get one of the guys who is running a SpeedPassion to try it as well.
When you tested it first and it worked with a reciever pack but drained it that shouldn't be a problem as you can use a bigger mAh pack as the weight of the single cell Lipo is very low so adding a bit bigger reciever pack shouldn't be to much of an issue.
#206
Hey JB, what's going on?!?! Think you could do me a small favour? If you've got a t-bar car lying around could you see if the pack fits across the chassis above the t-bar without interfering with the shock? I'm going to try and stop when I'm home. See you then, say hi to your folks for me!
#207
Tech Apprentice
iTrader: (1)
Hey JB, what's going on?!?! Think you could do me a small favour? If you've got a t-bar car lying around could you see if the pack fits across the chassis above the t-bar without interfering with the shock? I'm going to try and stop when I'm home. See you then, say hi to your folks for me!
JB
#208
SHOUDN'T BE A PROPLEM!!!!! Where did the extra mAH go. If the RX and Servo only pull what they need then that means the rest went into the ESC, to most likely back-feed to the motor/main battery. No matter how you look at it that's an unfair/illegal advantage and not a practical way to test the likely hood that this set-up would work in competition!
#209
Tech Master
iTrader: (26)
Yeah.. That sucks and doesn't need to happen. Mahs just disappearing sounds like bullshit and makes for bad first impressions. Stuff like that needs to be figured out to a T before this thing has any chance of being accepted.
To start, what if you plugged the receiver pack into the receiver and turned it on. Then WITHOUT the main battery plugged in run the throttle on your radio. If the motor wants to roll over, that would tell me that the receiver pack is bleeding over to the power side. If that happens, try something else.
This damn thing just may not work until we have a specific built speed control. Then we would have no strings attached, I know everyone loves a little black magic, but cheating is cheating.
I heard someone say cut the racing time down. There's no way cutting races back down to 6 minutes is going to fly, 8 minutes is part of what makes the racing great.
To start, what if you plugged the receiver pack into the receiver and turned it on. Then WITHOUT the main battery plugged in run the throttle on your radio. If the motor wants to roll over, that would tell me that the receiver pack is bleeding over to the power side. If that happens, try something else.
This damn thing just may not work until we have a specific built speed control. Then we would have no strings attached, I know everyone loves a little black magic, but cheating is cheating.
I heard someone say cut the racing time down. There's no way cutting races back down to 6 minutes is going to fly, 8 minutes is part of what makes the racing great.
#210
I'm sure that speed control manufacturers will do the proper changes for this to work perfectly. It just takes some time but it will happen. In the meantime it seems like the GTB works in this application so if one ones to run this with no issues just run a GTB.