3s+9L in a lightweight 1/8th buggy ???? - RC-Monster Forums

rootar · **3s+9L in a lightweight 1/8th buggy ???? -** 05.04.2008, 08:28 PM

Well i come across a GREAT deal on a brand new roller at the track the over the weekend, and the only way i could afford to get it is if my whole setup out of my lightning stadium 10 will switch over and run the buggy pretty decent, here are the specs of my ls10 im running

rtr weight: 5.5lbs
tire diameter: 5in
battery: 3s 5000 maxamps
Motor: 9l with rc monster heatsink
contoller : mamba max with cc bec
geared for: 45mph
runtime: a solid 50mins to an hour.
temps: at the end of 45 mins of on track racing temps on everything was less than a 100 degrees on a 75 degree day

from what ive seen the standard is to run 4s in the buggy but these setups are so fast its crazy, my ls10 is easily WAY too fast on the track i raced at, i droped the big tires after practice for the stockers which put my top speed back at 40mph and i still had to let off on the biggest jump out there that only the really good nitro guys were doing good everylap. Im wondering if running my lighter setup would work good enough to race with and hopefully have a 1/8 scale buggy rtr at 7lbs or less if possible....the tires are lighter and smaller than my truck tires i run and id only gear for 37-40 tops, would this still let me run the buggy chassis and still get 40-45 minute runtimes and good acceleration, plus the slightly tougher drivetrain. i think my setup could handle it, i have never had my setup get hotest temp ive ever seen on my motor and esc so far was on an 80 degree days running in grass and the motor hit 115, and controller 110.

id shave off as much weight as needed if i could run my setup and still be happy, i just need some assurance that my setup would work enough for me to be happy with it agianist the nitros.

rootar · 05.04.2008, 08:35 PM

If my setup wont run the buggy good enough, i have got to get some 1/8 scale aluminum shocks on my truck and get the suspension better setup. I also need to find some half inch offset buggy wheels so i can use my 17mm hubs and buggy tires and then they will let my race in the buggy class instead of the electric/sportsman class that i had to race in over the weeknd (which was very unfair to everyone in that class) casue my fastest lap was 10 seconds faster than theirs.

05.04.2008, 08:56 PM

You're better with 4s and XL can for 1/8 scale buggy.
And you'll never been able to build an under 7lbs rtr 1/8 buggy, never

jhautz · 10:55 PM

Quote:

Originally Posted by david lamontagn

And you'll never been able to build an under 7lbs rtr 1/8 buggy, never

I don't know David... I'm getting REALLY close.

RTR, with the body, battery (4350mah 5s), Neu 1512, and even the body clips its only 7.14 lbs!!!! The new 808 is really light. I might even be able to shave a few more grams when I install the body that came with the 808. I'm using a pretty thick/heavy one that was on another buggy until I can get to painting the new body.

The weight without battery is 5.89lbs.

On 3s with a smaller motor I could probably get it sub 7lbs RTR.

Couple proof pics.

With battery RTR

No battery.

EDIT:

Sorry for the derail rootar. I'm with Glassdoctor. I think it can work as long as you dont expect it to be whipping up on the nitros the way a more properly sized setup would.

magman · 05.04.2008, 09:04 PM

Here's my mbx-5 w/ a 9xl, mm esc on 4s and it weighs a little over 9 lbs. and it still screams!!! http://www.rc-monster.com/forum/showthread.php?t=11763

rootar · 05.04.2008, 09:27 PM

whats soo heavy on the 1/8scales? i know the driveline is slightly bigger than my ls10s, and they are a lil bit longerbut it definetly doesnt look like there is that much more weight over my ls10. Maybe they are using steal in all the plastic on those buggies to make them so tuff lol.

i guess im hoping for too much? anyone hellp me with finding front a rear buggy shocks to fit my truck. i looking for regular size buggy shocks 3.875 inches eye to eye in the rear and 3.750 inches eye to eye in the front?

glassdoctor · 05.04.2008, 09:58 PM

If you don't expect to keep the same 45mph speeds... (gear it down..) then I think your setup could do ok. It goes against much of my personal preferences... although I have run basicly the same thing before. That was back before the MM and I had a Hacker Sport in a Kyosho buggy with a 9L.

It ran ok... but never got to do much with it. The motor had a winding short out and then the esc smoked, LOL....

Keep the buggy as simple and light as possible and don't gear it to be the fastest car on the track, and it should do ok.

rootar · 12:38 AM

i basically want it to run with a nitro buggy, with out heating issues of course, like i said i would gear for 37mph with the nominal voltage, i know this would give me enough speed and i think it would be geared low enough for the combo to work like i want, but i know the temps will rise due to the extra 1.5 pounds or so, but hey didnt everyone use to run a 9L in emaxxes and other big mts? i sure cant afford no xray lol but hey a 9L and 3s 5000 maxamps looks tiny compared to those bigole extralong 4s flight power packs and the nue and xl motors are bigger also, so really if i had the weight of a roller no motor or battery i could tell you how much it would weigh with my setup, but i know my battery definetly doesnt way more than a pound i think it was .76something pounds or 12oz when i weighed it today. and your battery weighs 1.24 pounds plus your motor weighs more, so it does look like you could get a buggy under 7 pounds rtr i actually think his would be close to 6.6 pounds rtr with my electronics....................

lincpimp · 05.05.2008, 02:06 AM

I have a feeling that your 9l will work fine in the buggy, just do not overgear and keep it as light as possible.

My hyper8 is at 7.6lbs with the batteries. I have not tried to make it lighter, this is just how it turned out. If I removed the servo mount, and went with some small chassis mounted servo holders that would shed some weight. But I would have to make a new front brace, as the hyper8 front brace uses the servo mount. I could most likely drill holes in the servo mount, and half its weight. I could have the chassis milled out with a ball mill some more to cut weight, but I am not sure what that would do to the chassis strength. Cutting down on wire length, switching to a MMM to loose the ubec, and a 6s lipo as opposed to 2 3s lipos would remove some weight. Maybe cf shock towers and top plate too? I like the milled all towers as they are strong, not sure if cf is the best bet there.

Maybe run lighter weight oil in the shocks! (joke)

Lighter wheels and tires should offer the best way to loose weight. I will weigh the wheels and tires, and see what they weight, They are generic and I would like to see the difference in weight with better wheels/tires?! Who makes the lightest tires?

rootar · 05.05.2008, 07:49 AM

link the deal i found is actually a hyper 8 roller, so thats good to here its not a porker of a buggy compared to the 808 pictured above. im not gonna bash it or anything ive got my ls10 for that and all ill do is play musical chairs with the electronics, this buggy is ONLY gonna be run on a groomed track, if i gear it for 35-37 i should top out in two places on the track which would be fine, because the whole inside of the track is very technical and twisty and my truck is hard to run consistantly in the infield. I guess i could always get it and try it and if it works it works if not i can put the chassis up till i could afford a separate 4s and xl system for it.

05.05.2008, 08:11 AM

It's realy light your 808!!!!!!!!!!!!!!!!!!!!!!
My Hyper 7 pro, without any electronic (no batterie, no motor, no esc, no servos) is 6.2lbs

I realy want to have a light buggy like that.

But i have a 1515, i don't know de weight difference between a 1515 and a 1512?

But for the li-po i've a Flightpower 5000mAh, 4s, it about the same as you 4350, 5s

lincpimp · 05.05.2008, 09:20 AM

Quote:

Originally Posted by rootar

link the deal i found is actually a hyper 8 roller, so thats good to here its not a porker of a buggy compared to the 808 pictured above. im not gonna bash it or anything ive got my ls10 for that and all ill do is play musical chairs with the electronics, this buggy is ONLY gonna be run on a groomed track, if i gear it for 35-37 i should top out in two places on the track which would be fine, because the whole inside of the track is very technical and twisty and my truck is hard to run consistantly in the infield. I guess i could always get it and try it and if it works it works if not i can put the chassis up till i could afford a separate 4s and xl system for it.

You will be happy with the hyper8 ross, it is a nice buggy. Since your track is technical, give the 9l and 3s a try, it may work well for you.

rootar · 05.05.2008, 09:57 AM

haha id like to not out power the nitros but out drive the nitros with the consistantcy of electric power lol...... thats sounds like good enough BS to try and make it work with my setup what would i want my max running temps to never exceed on the mamba and my motor? 150 for both? or would that be a little hot, both are never over 110 after a full pack right now so do i have about a 40 degree window left of safe operation?

rootar · 05.05.2008, 01:44 PM

http://www.youtube.com/watch?v=fOifsD4GQPE there is me on the track ill be racing on on.

SpEEdyBL · 05.12.2008, 05:57 PM

I have the 9L and I have run it on 3s. It seems to run hotter on 3s than on 4s no matter how I gear it, but im beginning to think that the rotor is demagged. The motor spins with almost no resistance. It's decent powerwise however. Setup is a Losi 8ight, MM and a kokam 3s 3200 mah pack. Total setup weight rtr was somewhere between 6.5 - 6.8 lb.