anyone run 3S in a Truggy?

[jsr]

Call it what you like. Those are the temps I get. I'm not full throttle at the track except on the straights, which aren't that long and run for about 15 minutes at a time, so my temps aren't that high. Even when bashing, my temps have never exceeded 140F on an 80+F day. I've yet to run it when it gets really hot here (90-105F), but so far so good for me. Believe what you like, but since you've never tried this setup, been at my local track, etc. then it's only your opinion based on your experience with your particular setup. My statements are facts from my runs and experience with my setup.

[riverat1540]

i think ur facts are wrong as well, i also call BS if it was that simple every one would run that setup

[florianz]

Originally Posted by jsr

Call it what you like. Those are the temps I get. I'm not full throttle at the track except on the straights, which aren't that long and run for about 15 minutes at a time, so my temps aren't that high. Even when bashing, my temps have never exceeded 140F on an 80+F day. I've yet to run it when it gets really hot here (90-105F), but so far so good for me. Believe what you like, but since you've never tried this setup, been at my local track, etc. then it's only your opinion based on your experience with your particular setup. My statements are facts from my runs and experience with my setup.

they way you write it, I would believe your figures. It's easier for people to say "noo, that doesn't work"... still, it's hard to believe.

the negative of high voltage is the extra weight. 4000mah 4s is lighter then 6s 4000mah. every gram of mass extra, you have to accelerate and stop. this causes stress on the components. your cars isn't heavy, so it's not that hard work for a 74mm motor.

I have once read, that in 1:1 car racing every extra kg requires xx horsepower to be the same fast. that's why I don't like today's cars with all that electric extra stuf nobody needs. that's why I like my vintage benz...

I call BS too. I raced quite a bit with a 3s setup in a buggy with a 1512 1.5d (3300kv) motor. It worked pretty well, but the battery temps were pushing 140+ degrees. I eventually puffed a 3s 6000 25c PQ pack and used a 3s 8000 Maxamps pack. There is no way a 3s setup geared to run with nitros on a medium to large track is going to run efficient.

On smaller tracks, 3s is more than adequate though.

I wouldn't say that the motors and esc run dramatically cooler, but the batteries definitely aren't nearly as strained. The batteries on my 5s setup rarely break 100 degrees on a 80 degree day as long as I don't run them down to the LVC. As batteries improve, it may be possible to run lower voltages without much risk though.

The difference is in the efficiency/run time. I can get the same run time out of a 5s 3300 that most guys are getting out of 4s 5000/5500 packs. I know people racing with 6s 2600 packs. I have RACED a full 24 minutes straight during an A Main to LVC on a 5s 5000 pack on a big ass track. There is no way a 3s or 4s setup will ever get that kind of run time.

[lincpimp]

Originally Posted by florianz

the negative of high voltage is the extra weight. 4000mah 4s is lighter then 6s 4000mah. every gram of mass extra, you have to accelerate and stop. this causes stress on the components. your cars isn't heavy, so it's not that hard work for a 74mm motor.

I have once read, that in 1:1 car racing every extra kg requires xx horsepower to be the same fast. that's why I don't like today's cars with all that electric extra stuf nobody needs. that's why I like my vintage benz...

Your statement may be true that addl weight causes addl stress, but that is not a negative of higher voltage setups. If you run a 4000mah 4s pack and go to 6s, you reduce the mah to get the same runtime. The weight of a battery per watt is pretty much fixed. So if you want X mins of runtime at X speed you will end up with the same weight battery regardless of voltage.

Basically a 4s 4000 packs will equal an 8s 2000 pack. Keep in mind you will run a motor with half the kv for the 8s setup compared to the 4s. Plus amp draw will be less on the 8s setup (half or more) and that will provide better efficiency due to the lesser voltage drop on the 8s setup.

There is no negative aspects to a HV setup. Currently not alot of choice in escs for cars over 6s, and finding a good charger can get expensive. Also, 6s seems to work well for 1/8 scale, so no real need to go up to HV unless you are going for higher than normal speeds, or have a very heavy vehicle.