High speed buggy project......
 

Well those that PM'ed me here is the project I am working on. Thanks to guys like Aqwut, Lutach, BrianG and others I have gotten ideas off of some of their builds. I bought a XLB a few weeks back and decided to go full tilt on it.....

Shooting for 100mph on it.....

http://www.forcedinductions.com/imag...cs/RC/xlb1.jpg

http://www.forcedinductions.com/imag...cs/RC/xlb2.jpg

http://www.forcedinductions.com/imag...cs/RC/xlb3.jpg

The setup will consist of:

2 X Turnigy HV's
2 X 1527's
4 X 6S lipo's

I will keep this post up to date as I start to try to fit all this crap under the buggy body....lol

Still haven't figured out how to mount both 1527's on the single spur...but I will come up with something.....I think

NICE! JZE... I'll race you to it.. I'm just waitin' for my NEUs.. if they ever come in...

Which ones did you order?

Oh for those asking what BEC I was using on the MMT and using on this project......here it is.

http://www.western-robotics.com/images/HBECHV_FRNT.jpg

One of the guys posted this a while back....not sure if it was Aqwut or Lutach, but I decided to try it. This sucker rocks!! Will take up to 14S input, where my CC BEC would only take a max of 6S.....boooo...hehe

It was probably me: http://www.rc-monster.com/forum/showthread.php?t=11251

Yeah, fitment is gonna be a real PITA!! That's a LOT of equipment to stuff under that shallow body. It should be interesting to see how you're gonna tackle this...

Yup that is where I saw it. Glad I bought this thing.... I have tried several other BEC's and they don't perform like the specs say. Also I was getting alot of noise from some of the other BEC's.

Yeah...I am wondering if I can even fit all that. The chassis on this thing though is VERY big. Its a 1/7th buggy so its not small by any means. It has a 16.5" wheelbase so its not small.

I was thinking height. With a large scale, you could maybe put battery trays on both sides (on the dirt guards), and then maybe make something similar to the original emaxx motor mount so the motors sit up over the cells, but out to the sides a little. You'd probably have room up front on one side for the receiver, BEC, and the dual ESCs.

That is gonna be one HEAVY vehicle!
12s lipos are gonna be around 3-4lbs each.
Motors are around 1.4lbs each.
ESCs, BEC, receiver area probably close to 1/4-1/2 lb altogether.

So, you're looking at around 11-13lbs of just equipment at the least, not to mention the weight of the vehicle itself (around 10lbs?).

Yeah weight is going to become an issue for sure. 24S worth of Lipo's is not light weight by any means. I may have to re-think this and possibly just go single 1527 and run 12S with 6S on either side for balancing. That would also allow me to keep the body low.

Thanks for the link for the 14S BEC, i haven't seen that one...
It will be one heavy and powerful pig man.... I like it...!!

They make a high amp model as well of this BEC. But I don't think its needed unless you run alot of digital servos.

Interesting project. What kind of power requirement do you think you will need?

I would think that 4 fp 3300 25c 6s lipo packs would do. That would give about 3000 watts to each motor, so about 4 hp per motor.

Given the large amount of space, you sould be able to put a motor on either side of the center diff. Make one big bulkhead that replaces the rear center bulkhead.

How about some body off pics?!

Here is a pic of it with no body on it.


http://forcedinductions.com/images/f...%20002.jpg

As for Batts. I have 4 X 6S Zippy 5000mah lipos. They are rated 20C/30C

That thing looks wicked with the Phaltline tires.

I would mount the motor front left and dual packs either side at the back...

I may be the ignorant one on the board; but can you tie the BEC into a single pack instead of the full HV? That way it will be running off a lower source voltage then the combined power.

Yes you can, but the pack with the BEC will drain faster than the other one. This will cause uneven pack discharge, which will cause the LVC to not work quite right since it just sees total voltage.

However, that one is not rated as high voltage. It would be expensive, but you should be able to parallel two of the HV ones. You won't get exactly double the current, but at least 75% more, so around 6A.

I run no LVC anyhow. I do 10 passes before re-charge. Your top runs will come on the first 3 passes...that is it. Been there done that. After that as you can see in my video, the truck starts to slow down little by little.

Well, I guess it's OK then. :smile:

Wow. That looks good, but I'm getting ideas from you my friend :lol:. I keep checking to see if Aqwut will slip a few photos, but I might need a spy to get that job done :intello:. Just imagine if I had 100% of time for myself!!! Stuff like :gasp::surprised::oh: would come into play :lol:. I'm loving this smilies :lol:.

Nice Ride, but is that chassis tweaked?

It looks like the front bumper and suspension are all rolled clockwise by a little...

The body was up on one side and I had some 5S batteries mounted on one side for mock up. That is what the leaning is for.... :intello:

ohhh ok, i was hoping it was something simple, other wise u would have a fun time bending it back :D

What do you think about running an extended chassis on this sucker?

I say this cuz I just bought an old used buggy that the prior owner had converted over to truggy using a Dragon Racing conversion kit. First thing I noticed is how obviously long(er) the chassis is. Not to mention stronger & lighter then the OE pan. Might be worth looking into to gain some needed wheelbase (for high speed) and to help stuff all those electronics in there.

Is the weight (24lbs) really going to be a big factor given the HP (4+) that will be generated by two 1527's? I'm just thinking that for real vehicles 6+ lbs/HP is a fantastic ratio. I don't know the math/physics but it seems to me that the bigger issues will be the aerodynamics and high speed stability.

I was thinking 2 1527's at 12S each, is more like 4200-4400 watts each. Which should be around 11-12HP.

I didn't know anybody made one for the XLB chassis.... I figured 16.5" wheelbase is pretty dang long

Will you leave the 2 speed in it? If so I do not think that 100mph will be difficult with a pair of 1527s running 12s.

You will needs some serious wings to keep it on the ground. Sounds like fun!

No, running single speed.....no need for the 2 speed. I will eliminate low gear 65T and just use the 60T spur. I tried running the 2speed on my MMT and it was cool, but just added weight and rotating mass.

Just out of curiosity... what do you do for a living? These are some very impressive, but expensive toys you have built/ are building...

I own several companies.....

Some of my full scale toys are here.....

http://www.forcedinductions.com/Projects.htm

I kind of thought that you were about speed. I saw what looked like a turbosmart or turbonetics sign. I love turbos. My go kart had a small turbo that my grandfather bought here in the US. It was an amazing improvement on power.

Yeah turbos rock.

Forced Inductions is my retail company the sells to the public, Turbo Diesels.net handles all the diesel market and manufacturing for it...

FI-Engineering handles the CNC machining for some of the big turbo manufactures, plus we manufacture/produce our own stuff as well.

hmmm What could you squeeze on a TT 3.2?

Im so poor.... *sob*

You did mention the FI thing before now I think about it, my memory is just crap- dont be suprized if I ask you again in a week or two, lol.

Looking forward to WFRCCC then?... :yes:

Neil - What's your passion - Richard Brason started selling used records on a market stall...

If it is it rc - why not start RCM UK or be the first UK distributer for Neu / Castle / Fastlance / RCM and Feigao...

I'm going to talk to my uncle in Brasil. He owns a company that makes truck tire protectors, but he also does custom jobs for other companies. I spoke to him briefly about wheels and tires for the R/C industry and he sounded very interested in making them. I have to work my ideas so he can see them. One thing that I told him was that the current tires for 1/8 scale buggies and truggies becomes a pizza cutter with high RMPs and he said not to worry as he will use reinforcements like the real radial tires have. I will sort out some tires and wheel and send them to Brasil as soon as I can. He wants to see the different types of tires that are available. It will be completely different from what's available now and it should be great for racing and high speed runs.

I confess to seeing that this would be difficult to do - Forces in rc are higher almost than a car with greater RPM on tire - Difficult to see how a seal could be maintained...

Oops I now that three separate conversations going in one thread - I've been around linc too long