My ERT thread
 

Here are some pics of the brushless ERT to be;

http://rc.stuurmijmail.nl/ert/1.jpg
http://rc.stuurmijmail.nl/ert/2.jpg
http://rc.stuurmijmail.nl/ert/3.jpg
http://rc.stuurmijmail.nl/ert/4.jpg

Rene Thank you very much. My friend had to talk me thru it over the phone. I will be using a 9XL, warrior 9920 & maxamps 2s2p 8000 MAH lipo's or 4s to power it .

Damn, thats a very clean set up. Just add motor mount & motor pretty much and you'll be laughing.

Thank you the motor mount is in the mail. As you can see im using a hpi hellfire radio box. Can you guess who got the rest of the hellfire truggy :005: .

Yeah, Awesome work Mike!

Is that the hellfire radiobox?

Some questions are answered before they are asked.. :)

BeeGee has got the rest of the HF!

Side note the reciver UBEC & LVC, & all plugs except the deans plugs are in side the radio box.

RENE yes it is.

9Xl on 2s2p, thats doesnt sound like much power, wouldnt 3s2p give you alot more speed, or am I showing up my lack of knowledge?
On the subject of radio boxes, I would have liked to have had an old T-maxx 1.5 radio box, rather than the newer grey type (wrong shape to fit an emaxx). It does do a damn good job of tidying up the wires on your ERT. *jealous mode engaged*

My bad im using two 2s2p 8000 MAH or 4s toal. The black plastic on the battery trays is kydex plastic. I measured the lipo's & then cut a 2 by 4 to size & shaped the plastic around it. The Gmaxx straps will be between the plastic & aluminum end cap. I'm also thinking about using a side to side strap.

I reckon a Gmaxx strap from one end of each battery box to the other would be fine- bolt it onto the aluminum end caps either on the inside or out side, depending on how snug a fit the batts are in their boxes. Do you have the batts already- a pic would prove useful in seeing how tight a fit they are.
That and we like picks around here, as you should know..... :)

Yes i have the batterys. They fit very snug in the boxes, no slop at all . There is 1/8 of a inch of foam rubber all around & underneath the batterys. The foam is not in the boxs in these pics.

Very, very nice hippie! I assume you got the UBEC inside the radio box?

Although I really wanted that radio box! J/K, I was going to remove it anyhow. :)

LOL:005: yes brian the UBEC & LVC are inside the box. I'm pretty sure there is another radio box in your package.

That is a clean setup. It should run very well. I don't know about that 9XL on 4S not being powerful enough. I'm running a 9XL on 4S in my 8ight T. I won't say the power is stupid, but it's still fast enough to pull the front wheels if you don't exercise caution with the throttle. Mine is faster than any nitro on the track. I have mine geared 14/46 and it is a wicked tight to medium track setup.

Thank you Sui thought i said it would run on 2s , i typed it wrong & then corrected it latter .

Very nice...just make sure those battery wires can't touch the spur...ah, the joys of Zip Ties...

DM

Nice job Hippie! :004: I love the clean wiring. Is it possible to slide in the battery tray on the motor side inward since the rear brace is opposite the drive bone? This would help out the left to right balance.:032:

Thank's Cadima

Not really there is about 1/8 or 3/32 of a inch or less as it is. I acctually slide the battery's out to were the chassis kicks up on both sides to make sure they both clear the diff .

It"s Alive
 

I got my ERT running tonight. Im running a 62/13 gearing right with a 9XL with 9920 no fan & 8000 4s lipo. I was playing around out front of my apartment for about 6 - 10 min it's 11.30 pm EST. My temps were

ESC 125
MOTOR at can 125 at heat sink 100
Left lipo 92 & right LIPO 92

So far im very satisfied. Any suggestions ?.

Also can i just throw them back in my car tommorow & have fun or do i have to charge them again & do i have to discharge them or can i just store them ?. I dont know how accurete my OFNA temp gauge is.

I ran it again today here are the results after about 8- 10 min of high speed runs. .


ESC & fan 105
Motor 155 at can
lipo 103 each

Those temps are good- cold as a cucumber.

1st day at the track results
 

I finally got to the track with my ERT today. I was very pleased with the results. The track was blue groove & a light coating of dust, air temp was close to 90 degrees

My equipement was
9XL with 62/13 gearing with fan
4s 8000 maxamp lipo's
warrior 9920



The following results were after at least a 15 minute run

Motor temp 155 average max was 170
lipo temp were 108 average 118 max
ESC was 105 thru the fan average, 121 at the heat sink max

Mac what are you running for oils in your ERT ?

FR shocks
RR shocks
FR diff
CEN diff
RR diff

Sounds like you have a good setup there! Nice temps considering the ambient temp...

I thought so to . I could use a touch more speed on the front streach. I wonder if it's better to go to a 14t pinion or go to a 8XL motor ?.

It very much depends on the track conditions but I like it a bit stiff. Most of the tracks I run on are not very bumpy (at least not at the start of the day) the trend up here is big, flat base with nice size jumps, not bumps...so I run 50 or even 60 wt oil in the front and rear. I tend to run the same on both ends. I feel like the Electric truck has plenty of squat already so on mine, I don't drop the rear 10wt like you do on most trucks. As for Diff oils, it's 7K or 5K up front and 3K or 1K in the rear. In the center I mix it up often. I keep a 50K built and a 30K built. I like the feel of the higher oils in the center but I have swapped it down to as low as 10K. I like the 30K best though at the Wolcott race I ran 50 for instant acceleration over the triple.

DM

I'd always say give it a shot and see, remember that one these trucks 1 tooth is a MASSIVE gearing change so I'd never move more than 1 tooth up or down if you feel like you are in the right ballpark. Personally I run either a 9 or 10 tooth, never tried anything bigger with my current setup.

DM

Thank's david

So you run 30 or 50 thousand in center, mine has 7000 in it i belive, from the guy who built it. I'll go up to at least 20,000 to start. My home track is very smooth ( well groomed) & a real blue groove track.

It's very close in my opinion. I'll try a 14t pinion plus try different diff oil might be exactly what i need.

Oddly I like the way 10K feels in my Nitro CRT but I didn't like it at all on the electric. It diffs out WAY too much and then it accelerates erratically. With a light diff oil in the center I'd say mine feels "mushy" it takes extra time to get traction and start moving out. It IS easier to drive but it's slower...I like the feel of a heavy center...20K is great (if you can find it...I seem to recall it was hard to come by) anyway give it a whirl and post up your findings.

DM

David use this program & make your own. Use 10 & 30 to make your 20 .
This program tells you how much of each oil weight to use to make your desired weight.

http://www.gesilicones.com/gesilwiza...l?SMSESSION=NO