1/8 buggy set up

[jnev]

Well, I finally decided to convert my XTM Xtermiantor Deluxe to brushless instead of e-revo or e-maxx, mainly because it will be so much cheaper. I have already sent the buggy to Mike so he can make the motor mount. He should be recieving it sometime at the end of next week.

Now my question is what set up should I run in this thing. I only bash, so I need a really long run time. Also, I don't know if anyone does this, but I would like to have one battery to hopefully last a whole bashing session. I was think of running a 5s or 6s 10,000 battery from Max Amps. I was thinking, about 40 - 50 minute run times if that is even possible, a little less would be fine too i think, but then I'd purchase 2 batteries to use. I am still not decided on the batteries nor anything else. I was planning on waiting for the Mamba Monster Max, but from the sounds of it, Castle Creations will be lucky to release it by 2008. So now I am in search of a different set up. As far as speed goes, I would like to keep up with my bro's picco 26 revo... so about 50 mph, would be ideal.

I was thinking about a 9920 or quarks 125b, but still not really sure. I would like to keep this on the low side, hopefully below $350... more like $300 though.

Just let me know what a good set up would be and what will work well.

Thanks a lot.

[MetalMan]

Right now I'm running 16.5v 4600mah and a Feigao 540C 9L in my X-Terminator. My thoughts are that 5s/6s 10000mah is going to be too heavy at greater than 1000g for a 5s setup (my setup is already heavier than the nitro with a L motor and 700g of batteries).

I think a Feigao 540C 8XL would be a better motor, as well as 4s 8000mah Lipo. The X-Terminator is a pretty narrow buggy, and I had a difficult time fitting the batteries onto the chassis. Right now, the batts are mounted mainly to the mud guards.

[jnev]

What kind of speeds and run times can be expected from this set up for normal bashing uses. Also, what ESC would be recomended with the 8xl motor? I am also assuming that I will need a ubec instead of the reciever battery, is this correct?

Thanks

up to 40 mins of bashing, not full gas everywhere and all... imo the 8k packs are more then enuff, i dont know if u would want more wieght, and more runtime is more heat..

u should use a ubec on any speedo over 10 cells.. but u dont NEED the ubec, a reciver pack would be the same, but more wieght

[MetalMan]

You could use a Mamba Max ESC if you plan on using 4s Lipo. A UBEC is a good idea if you want to save some weight.

A highway patrol officer clocked my X-Terminator at 42mph. At this point the motor has been running at under 130 deg. driving on the street with Proline Road Rage tires (good traction). I'm using a Mtroniks Truck ESC (had it laying around), and it's running well. It hasn't exceeded 110 deg. in the same driving, and the batts have been under 90 deg.

Make sure to post some pics of the motor mount when it is finished. I'm very curious to see how Mike does it.

[jnev]

Will one 4s 8000 pack give me sufficient run time and speed using an 8xl motor and the Mamba Max ESC? I was trying to use BrianG's speed calculator, but it was a little confusing as I do not know the gear ratio.

And I will definately post pics, once he is done with the mount.

[MetalMan]

You could do a single 4s 8000mah pack, and I think that would be a more ideal setup for the X-Terminator because of the narrow chassis. Then you could mount the motor on the other side of the chassis.

Use the "8th Scale Buggy" setting for the Front/Rear Differential gear Ratio. Then choose the spur gear size and the pinion size.

hey rc, u need to update ur sig lol

but i aggree one pack should be more then enuff

but how is mike doing the mount? is the motor going to be on one side of the chassis? ot stood up in the center?

I'm running a 7XL in a buggy with a MM controller with 14/46 gearing. With a Polyquest 4400mAh pack I'm getting at least 15 minutes of runtime in a track environment. For the track, this setup is crazy fast. If I were to do it again, I'd opt for the 8XL for something not so crazy and more runtime.

As for battery selection, big capacity is great, but comes with a tradeoff. It adds weight. Lots of guys run the 8Ah packs, but I chose to run with smaller packs. I just got the 4400 to try it out and am waiting for a pair of 4S 6Ah packs. I felt that the 6Ah packs were a good trade off between runtime and weight.

My 7XL setup, easily does 40 mph. I think that the 8XL will come close to that and should be a better choice. For 4S, I think that the MM is also hard to beat, due to it's user friendliness. If you have access to a computer to program it, that is.

[glassdoctor]

I like the smaller packs also. But most club races will have at least a 15 min A main, and any race with a good turnout will do 20-30 minutes.

I can change out the packs, like I did at a race last summer, but with the 8000 pack I don't have to worry about it.

I really would like to try a 4900 Flightpower or Kokam pack though. That would be light and super fast.. and still good for a 15 min race, and if my results from last weekend are accurate it may just be enough to do a 20min main.

Hmmm....

[jnev]

Thanks for all the info guys. I am now leaning towards the Mamba Max ESC, 8XL motor, UBEC, on a 4s 8000 pack. i am hoping this will give me around 30 minutes of run time at around 45mph. Hopefully i'll be able to change the gearing to my liking as well.

BOR - I am not really sure how Mike will do the motor mount, since he hasn't even recieved the buggy yet.

ohhh, well u didnt even say i want it this way?

[jnev]

I said this in the very first post.

When you order the battery from Maxamps, be sure to go through the trouble of getting a password (membership) setup. It keeps tabs on what you spend and applies discounts when you log in. I'm up to a discount rate where in I ordered the 4S2P 8000mAh pack and I upgraded to the 12 gauge wire, with a deans plug installed, and the shipping came out to be about the same as the "regular" price for the pack.

BTW, the Exterminator was my first buggy. A lot of people laughed at it when I showed up at the track with it. I suppose it doesn't compare to a Mugen or Kyosho, but if you take the time to tune the suspension and set the diffs up, it will treat you right. I only went to the Sportwerks because that's what my LHS stocks parts for.

As for the gearing, I suppose a 14/46 will be a good place to start. I say that because that what I was running with my 7XL, but went down to a 12T to tame the top speed a bit. I think it would be about perfect for the 8XL.

[jnev]

Great, thanks so much for the help. I will also definately become a member. I need to save as much money as possible, lol. When I wen to BrianG speed calculator, I keep getting below 2 mph, so I know I am filling in something incorrectly. Can someone help me with this?

1) 8th scale buggy
2) direct spur/pinion drive or center diff
3) (blank)
4) 46
5) 14
6) 14.8 volts (4 cells, 3.7 volts per cell)
7) BK Wanderer 8XL, KV = 1875
8) tire diameter ??? no idea, lol.