ElectricGuy007

Ouchies, melted gears in 7 seconds.....[X(]
I'm happy with a 8.5 novak motor in my 2wd slash. I believe it's only 5,000kv or maybe 50,000rpms
I'm gonna press my luck and try to outdrive the new 4wd slashes on the track saturday.
I may have the advantage because the 4wd's are heavier, and the stock traxxas tires hook up about anywhere.
IF I could race my F150 against the slashes I would, but it's so small Id get beaten and banged around too much
and risk tearing it up. Just makes sense to race a truck that is equal in size to the others.

vpower

ok are you all listening too me?javascript:void(AddText('[:@]','_image/s6.gif'))

i said i wont use it offroad untill i prove im the fastest at a drag race here in miami Florida,s tropical park ill be running a rhino 1550 mah 3s li-po once i prove im the fastest i will buy a 2s li-po and gear it down for off road (yes i will put a fan on the thing)[&:]

rebuilder

It'll barely move with a 1550 mah...............................

vpower

so your that person on youtube with the tires of the slash ripping off! oi have a question did you put a fan on the motor???[&:]

vpower

ok if im going to win at a dragrace here against people whose cars reach about 80-90 mph what engine can i use to win huh?[:-]

vpower

well im using that li-po right now for a minizilla(and yes im having diff problems so im going to modify the thing so i can put the e-revo tranny and diff on it)

BigTb17

That Li-po is going to be way overstressed. It may simply drop voltage really bad and not provide much power. However, it may also be damaged or even overheat. Even at 25C that battery won't be good for over 40 amps. That 9000KV motor could draw twice that amperage and probably even more on 3S.

Like I said, people's advice on here can't stop you from doing what you want. However, you asked for people's opinions and they gave them.

Either way, post your results.

vpower

so if im running against people that cars can go 80-90 mph which engine do i buy and which battery pack[&:]

overrev

I'm not the person on you tube and I didn't run a fan on it. I had it geared 12/90 the temp would reach about 175 in 5 minutes. You will need a bigger battery it drains my 6500 in about 12 minutes. I think it would make a good drag racing motor in a light car.

BigTb17

Breaking 80-90MPH with a stadium truck will be difficult without modifications. You will need good, on-road tires at least. You may also need a custom body, and possibly weight in the front to keep the thing on the ground.

A lower KV motor, possibly even a physically larger one, with higher voltage is a better way to reach those speeds in my opinion.

I'm not saying it's impossible with that motor. However, it will draw far higher amperage than a lower KV motor on higher voltage. Because of this high amp draw it will require a powerful battery and will be more likely to overheat.

rebuilder

Your 9000kv can easily pull 100+ amps under full load and 3s. You will need a BIG battery.....this would work

http://www.hobbycity.com/hobbycity/s..._30C_Lipo_Pack

or this if you are trying to save a little weight

http://www.hobbycity.com/hobbycity/s..._30C_Lipo_Pack

overrev

If you want to drag race go to the drag race forum and see what they are running. It is pointless to ask here because most of them don't have a clue.

vpower

didnt you say that motor cant run on 3s li-po?????

rebuilder

Yes.....but he was adamant about doing it....................so i directed him to battery that would assist him in his 3s quest.

vpower

thats not very helpfull and does not answer my question(well it does but do you know a specific motor ?)

vpower

in your thingy below it says when in doubt over volt it hows that working out for ya?

rebuilder

Works good.....................within reason.....................I run Graupner 700 8.4v's on 14 cells in boats................and its my signature, not my "thingy"

If you ran this motor and geared it right you'd hit 100 on 3s..............the 4400 competition

http://www.offshoreelectrics.com/pro...u-1515&cat=117

vpower

so which setup should i use a 7700kv on 3s li-po and geared for top speed or a 5700 with 2 2s li-po also geared for top speed[sm=confused.gif]

rebuilder

5700 on 3s........................you'd have roughly 1000 watts behind you.............

matthew__ruane

5700 on 3s sounds good. Remember to put some good foam or street tires on there, and set it up with a bit of toe-in. If you really want to hit 80-90 mph, you're going to be going through diffs, spurs, pinions, and motors like cookies. If you don't have an adequate ESC you could cook those as well. If you don't get the proper batteries (big batteries) you're definitely going to lose some. Remember to weight down the front, otherwise you're going to wish you had some time on a flight sim.

Access

80-90 is probably not fast enough to win, even a modern nitro drag racer can do 100mph now so you should probably be shooting for 110+ if you want to come in first place.

ElectricGuy007

OK so you are putting it in a drag car...hum I see, might be a good idea. A 1550mah might catch fire with that kinda motor.
I highly reccomend a 5000mah or higher. Even a 5000mah will drain fairly quickly.[&:] And like Access said you have to hit 110+mph.
Access knows the current record holders because he was at a RC drag competition.

rclugnut10

My Feedback: (1)

personally i'd lighten up your chasie a bit by drilling it out or trimmiing in some places... as for batteries you're going to want at least a 30C for a 5000mha pack so you have enough amperage, with the 5700

you could go insane and pick up a MMM combo with a 2650 motor and hit it with 5 or 6S and gear the crap outta it, but you're gunna need 5mm pinions which you can get i've seen them or figure out how to run a 32P setup or even a higher KV motor for a 1/8 the reason i say go with the bigger motor is the TQ will be far more than enough for the truck so you'll be able to gear it to the moon, and not have to worry about heat issues...

the lug

Access

Actually the best way to get up there with off-the-shelf parts today (ie. stuff you can find in a LHS) is to use something like a Mamba Max Pro, a 6s LiPo, and a Novak 17.5 or maybe a 13.5 motor. Look at Nic's column on the ISC site. Keep in mind this is a bit dated.

http://www.rc-isc.com/forums/showthread.php?t=68

Remember it's not just the power or drive system there's a whole bunch of other things you should also be considering if you are serious abing going that fast.

srt10

My Feedback: (20)

this is crazy and cool at the same time!
this motor can take 100k rpms
not sure why people want to argue how many rpms this motor will actualy see on 3s that it will be over the 100k mark when it is inpossible for this setup in a truck or car to hit those rpms under a load.. [:-]
you nay not even see 80,000rpm topped out (its under a load)
IMO I would go with the 5700kv motor on 3s if I were bulding this, great motor on 2s for the track and 3s for all out speed and you can gear it more for the application
just my MO