does anyone know if a personal transponder takes away to much voltage away from a spec 1600 batt. pack. i race brushless spec nastruck with the novak ss 4300 system.

Well periphreals like your reciever, servo and transponder do not take voltage away from your motor. They take current. That means that your battery dies a very very slight amount sooner due to a personal transponder, but your motor does not see less voltage.

So, people in run time sensitive applications like modified sometimes use a receiver pack. Others use them as well, but it is not necessary. If run time is a problem for you then you could consider a receiver pack. I have never run a 1600 spec class so I have no idea.

If you are already racing and having no problems with run time a personal transponder will not change that. They use very little current.

I hesitate to post this, but that isn't completely accurate. With the batteries we use in R/C stuff, as you draw more current, the voltage will decrease. While I agree it is insufficient to consider, it does happen. To keep voltage constant and a certain amp draw, you have to control the amp input, Voltage and Current are related in that manner.

Well yes, but I was attempting to keep it simple and alleviate his concern.

The PT only draws only a couple of milliAmpHours total (if that much). The effect on your battery in a 4 or 5 minute run will not be noticable.

thanks for the input!!!!!
should i run a reciever pack just to be sure or do you think it is fine without it?

Yes, it will be fine without a receiver pack. If you dump then gear down. People realize a receiver pack isn't worth the tiny amount of run time they save the first time they forget to charge it and find their car in the wall.

after 8 long hours on the track practicing, we were trying to find out why a buddie of mine was dumping after about 2 min. he could not make run time. he geared down 30 points from normal. we ran about 4 battery runs, all dumped hard after 2min., then pulled the personal and put in a house transponder, and was able to run about 5 min before dumping. we ran like that for a couple more runs and then pluged it back in and it dumpedagain!!!!!!!!!!!

Something else is wrong.

By chance does the PT throw flames off the plug if you plug it in? :) Sounds like an issue with the PT. Although you wouldn't think that the PT could draw enough power to dump that early without turning into a blob....

Look for stuff getting hot... Something's gotta be cooking...

Between the PT and the digital servo they drew just enough for premature dumping. Have to run a rec. pack.
Remember boys and girls, new 1600 spec batteries suck @$$..

The new Trinity 1600 SPEC batteries may suck, but they also hold the lap record at Thunder Road. Most of our racers seem to think they may be a bit stronger, certainly not weaker, than the old ones. Thanks; Ernie P. :cool:

i like em, you cant complain about a 1600 pack that will charge to 2200 mah !!! i got 4, not all are that strong, but at least 3 of em are !!

Between the PT and the digital servo they drew just enough for premature dumping. Have to run a rec. pack.
Remember boys and girls, new 1600 spec batteries suck @$$..


hey mike, i run a futaba 3004 servo in mine too, another differance between our trucks, i never thought of that. i was thinking of putting a digital futaba in it too, i got one here laying around, maybe ill just stick with what i got, it works !!

hey mike, i run a futaba 3004 servo in mine too, another differance between our trucks, i never thought of that. i was thinking of putting a digital futaba in it too, i got one here laying around, maybe ill just stick with what i got, it works !!
Thats the direction I'm heading. With only 1600's I"ll also run a rec pac. Everyone else dose.

digital servos do use alot more juice then regular ones. like a 3004
I see no reason to run a digital just because its a digital. they give you
a ton of more torque. not nessasary for most apps. i would go
with a coreless but not digital if running any electric class without a
receiver a pack. i run gas and noticed my receiver pack needs
charged alot sooner then before i went to digitals.

just some friendly advice. take it or leave it.

jc

Digital servos do a couple of things better than non digital. 1 - they are faster reacting. This can make for a better driving car. 2 - they are much better in "centering" which means they go back to center better than non digital. Again, helping the way the car drives.

the extra voltage drop is low and if you use a receiver pack it will be un noticable.

Nobody at our track runs a reciever pack, and we were running 5 minutes. Some of us that run Spektrum use the Spektrum capacitor to help with voltage drops at full throttle (PT's not counting, etc). I think there's a lot to be said for how you treat your batteries. I still hear guys talk about charging at 7 or 8 amps. I've never seen any benefit from it on the new packs.

I still don't see the need for a digital servo in oval racing? If the car is right, how far do the wheels turn? A couple degrees? Doesn't need to be that fast either, or have that much torque. I've had no complaints running a $20 Hitec 225BB in my Spec (brushed) truck. Also have had good luck w/ the Futaba 3004, $15.

My $.02

I ran 7005’s and 9102’s for YEARS with no problems what so ever. When the digitals came out, I was the last one of the “McLin Mafia” to switch over. Now you couldn’t get me away from them. I even run a 9550 for a throttle servo in my gas car.

Maybe in the Spec class it wouldn’t be noticed but in the faster classes, I couldn’t recommend anything better.