i need a new project

[t-maxxracer32]

i didnt think it sounded right either but on the speed thing it sais i will hit 34 with the 3s123... will it be really sluggish? or no torque?

tell me right now if it is a bad idea to go with the 1.5 cause i dont want to spend the money then realize i need more.

[t-maxxracer32]

Originally Posted by ClodMaxx

dude, that thing is SWEEEET! i'm excited for ya, ryan. heck, i'm excited for me too - although i'm going to have to put mine together after it comes in next week... which is fun too i guess.

edit: i agree with squee - i'm planning to run 5s a123's in mine.

well if i ran 5sa123 with the 1.5d motor then according to the calculations it would be 50mph... which i DONT need nor do i want. 4s does sound a little more like it though.

plus if i bought 2 dewalt packs i would make 5 4s packs... which is not bad to me at all.

is the 1.5 not going to be enough? or with 4s will it be fine?

[ClodMaxx]

why not volt up and gear down? to me that would be easier on the system than low volts and higher gearing. i'm also using a LMT 1940/7, which is ideal on 5s a123's.

[squeeforever]

First of all, don't buy a motor yet...You can't even make up your mind on what batteries you want or can get. Simply think about things a little longer. Personally, I would go with a 4S setup in it. You can get a 4S2P pack from TrueRC for only $140. That would be my choice. And is. I'm gonna get one for my Revo. I would NOT go with A123. There just plain to heavy and not much cheaper than buying TrueRC LiPos. Besides, there heavier, bulkier, harder to mount, and there just plain ugly.

[t-maxxracer32]

Originally Posted by squeeforever

First of all, don't buy a motor yet...You can't even make up your mind on what batteries you want or can get. Simply think about things a little longer. Personally, I would go with a 4S setup in it. You can get a 4S2P pack from TrueRC for only $140. That would be my choice. And is. I'm gonna get one for my Revo. I would NOT go with A123. There just plain to heavy and not much cheaper than buying TrueRC LiPos. Besides, there heavier, bulkier, harder to mount, and there just plain ugly.

your right about the a123s... they are a big PITA when it comes to mounting and it is hard for them to look nice.

i will buy another 2s true-rc pack and call it good from there. if i feel the need to get a123s or the evo 30s then i will. but i will save that for later.

what motor would you recomed for 4s? the 1.5d?


also clod... the reason that i dont want to go with a HV setup is mainly the price.

maybe later when i make more money i would love to go with a 6s setup, but for now im going to go with a 4s like squee said.

[squeeforever]

I would probably go for the 1y/F. If you go with that, it will leave room for 5S in the future. The 1.5d would be good if your not completely concerned with runtime. Ones spinning about 32,000 RPM, while the other is around 39,000. Something in between would be best. Its your call.

[t-maxxracer32]

so the 1.5d would kill runtime?

[squeeforever]

Not necessarily kill runtime. It depends on your driving style for one. Personally, I would go with the 1y/F. That would leave room for 5S, and would give good runtime, which you'll need if you race since your gonna be racing nitros.

[t-maxxracer32]

that is true.

thanks alot squee.

im hoping to be ordering the batteries soon then the motor.

[Patrick]

Wow, you change your mind a lot.
Personally I wouldn't get the A123's for a race car. Big, bulky, ugly, and not as powerful. They drop their voltage a lot under load, so it sounds like you need 2p to get decent performance and runtime, unless you go really high voltage. I guess they're cheaper and safer, so they'd be good for a basher, but I'd prefer lipo for racing. If you only went with 3s A123 you'd need a lot of amps to get decent power and hit 34mph, which would mean poor runtime, more heat and poor performance, because the A123's wouldn't be able to hold their voltage under so much load. I wouldn't use less than 5s with A123, and I think you'd still need 2p too get decent runtime and performance.

I still like the 1515 2.5d on 5s lipo (it's good on 6s as well), but the 1515 1y on 4s should be ok as well I guess. I think the 1.5d's kv is a bit too high for such a big motor.
I went with 5s instead of 4s, so I could keep the amp draw and temps a bit lower when geared for a certain speed. I wasn't sure if using the 10C true rc packs on only 4s would be pushing them a bit, but they hardly get warm on 5s, so I guess they'd still be ok on 4s geared for the same speed. The 3s2p true rc packs are only $25 more than the 2s2p packs, so going 5s wouldn't be that much more, since you already have the controller and the motor will still be the same price.

[t-maxxracer32]

yes i do change my mind alot. i do not know why.

once i actually have the money in hand it is a different story.

i like to brainstorm all the options i can do i guess.... which isnt bad... just very annoying for you guys im sure.

as of right now i have 2 options...

buying sowers crt RTR (neu 1.5d 2 4s lipo packs and a mgm 16018) for 850. that would save me the trouble of buying a motor and batteries. i could sell the mgm and the roller for around 4-500 then spend only around 400 on the motor and batteries.

or if i dont do that i am just going to go ahead and get the 2.5D and get another 3s truerc 8ah lipo. that way i spend around 450.

i might change my mind again soon but you never know with me.....

and patrick you are right about a123s. they would be nice for a big beastly savage, e-maxx or lst. but for a pure racer it is not what i need.

i am going with lipos.

now to figure out what to do for my motor.....

i should have the money in a week or 2....

maybe by then i will make up my mind for sure lol...

[aqwut]

it's good to have options..

[t-maxxracer32]

yes it is.

sometimes.

it can get difficult and annoying though.

[Sower]

Originally Posted by Patrick

Wow, you change your mind a lot.
Personally I wouldn't get the A123's for a race car. Big, bulky, ugly, and not as powerful. They drop their voltage a lot under load, so it sounds like you need 2p to get decent performance and runtime, unless you go really high voltage. I guess they're cheaper and safer, so they'd be good for a basher, but I'd prefer lipo for racing. If you only went with 3s A123 you'd need a lot of amps to get decent power and hit 34mph, which would mean poor runtime, more heat and poor performance, because the A123's wouldn't be able to hold their voltage under so much load. I wouldn't use less than 5s with A123, and I think you'd still need 2p too get decent runtime and performance.

I still like the 1515 2.5d on 5s lipo (it's good on 6s as well), but the 1515 1y on 4s should be ok as well I guess. I think the 1.5d's kv is a bit too high for such a big motor.
I went with 5s instead of 4s, so I could keep the amp draw and temps a bit lower when geared for a certain speed. I wasn't sure if using the 10C true rc packs on only 4s would be pushing them a bit, but they hardly get warm on 5s, so I guess they'd still be ok on 4s geared for the same speed. The 3s2p true rc packs are only $25 more than the 2s2p packs, so going 5s wouldn't be that much more, since you already have the controller and the motor will still be the same price.

For what it's worth, the 1.5d (2700kv) motor on 4s doesn't get over 110 degrees under hard race conditions. The MGM never over 120. Granted I have a fan on my motor, but nothing on the ESC. Gearing is the key on that in my opinion. I run a 10t pinion and a 51t spur. Just FYI.

[t-maxxracer32]

well i will have your truck in the next week or so so i will be able to test it all on my own!!

what my plan on your truck is to...

-first try it out. see how it drives and see how it performs.
-then put everything on the xt8. see which truck i like better. -from there i will decide which truck to keep and which roller to sell.
then i will decide whether to sell the batteries or not.
if i keep them then awsome.
if i sell them then i am going for the 4s or 5s evo 30s.
once that happens i will be done =)