Aussie CRT X2
 

Hey guys .

Following on from conversations and PMs with some of you on RCTech i finally joined here .


My X2 is finished , waiting on the body to be painted and another esc.
Fried the MM when testing the X2 on the bench :cry:
Have back ordered a couple of MMM V2 ( one will go in my RC8 conversion ) and will be trying one of Arturs Modded R1Pros out .I can always sell the second MMM if not needed .

Following set up

PQ 5S 4350mah
Medusa 36-60 1600kv motor with 14 t - 15 t pinion ( 38 - 40 mph )
RCM battery tray
TeknoRC universal motor mount
MMM V2 or modded R1 Pro

Everything went smoothly in the build and have to say the driveline is the smoothest i have ever built , very nice :yes:

Only mod i had to make was for the Tekno mount .The mount itself is a very niece pice of work , cradles the Medusa like a glove and works as a heat sink .
I had to make 4 countersunk slots in the chassis for the mount so i could adjust gear mesh .
Also since the mount is seperate from the diff any flex in the centre of the chassis would disturb the mesh and could destroy the pinion / spur . I came up with the idea of using Traxxas steel pushrods ( plenty of guys on RCTech gave me some good ideas on bracing the diff ) and attached two pushrods to the top of the diff and rear chassis brace .
This should work well until Mike comes out with an X2 specific mount so i wont need the bracing .

Sorry guys having trouble with the the pics . Try again

Last pics for now .

On another note , after a few emails with Mike he was sure a couple of guys are already using the CR mount in the X2 so i ordered one to try out.

Very very nice. I envy u. Me all talk but no action :cry:. The rear brace is plastic isn't it ? Maybe good idea to upgrade to an Al one.

Regards,
Joe Ling

Nice X2! I really like the X2. I have an X1 that's been upgraded. Let me know how that medusa runs. I was thinking of a 60mm 1300kv one on 6s lipo. I'm running a Monster max.

Bye:smile:

Will do cemetery gates once i get a esc to run .If you already have a MMM that is working the 1300kv Medusa sounds perfect for 6S , try it out .
You will probably have it running before i do.

Joe i'm waiting to see if i can fit the CR mount so i can take the bracing away .If it won't fit i will upgrade to the alloy F/R chassis braces :wink:.

Mine has been running for like 2 months already(X1)! I run it with a Neu 1515 1y on 4s with the monster max(case has been cut to allow a 40mm fan on top, not that it needs it, but the castle fans don't hold up) The monster has held up to many weekends of me beating on it(racing) and no problems(except fan), it is the V1 also and I'm not running a UBEC.

Bye:mdr:

Received and R1 Pro so soldered a 35v cap to it along with an external bec hooked it all up and :yipi::mdr:

Had the truggy running for 5 mins just to test out the R1 since it will be living in the buggy and i didn't want to push it too much in the truggy .

Ran great on 5s and only got two temp leds lit up , very smooth esc , should work great in the lighter buggy .Waiting on a hotwire so i can set the lvc for 5s .

Tempted to take the X2 to the track for a day of running with the R1 on the weekend ( not having run the X2 on a track is killing me ) but i'm a little scared for the little esc .
I know you guys have had great success with it in the buggies but don't know of anyone with it in a heavy truggy.
I'll just be patient with the X2 and wait for the MMM to arrive , shouldn't be too much longer .

How did u mount the Tekno motor mount ffactory? I have an x1 i would like to have one of those on it.

You have to make 4 countersunk slots in the chassis for the mount and to allow gear mesh adjustment.

I just measured up drilled two holes ( make sure they are the right size for the screws ) were each slot starts and ends and then completed the slot with a dremel milling bit :wink:

Of course then i used a countersink bit . Dont forget though if using this mount you have to brace you centre diff somehow like i did .

Got a little present from Mike today :yipi:

Needless to say i can now confirm for you guys that the CR buggy mount fits the X2 :mdr:
Just need to take the dremmel and put a notch in it were it sits on the center chassis brace for clearance .
You can see it in the pic .

Also Mikes mount is about 1mm taller than the stock diff mount so you just have to shim the top of the stock mount so the top diff plate sits square . Bearing carrier is spot on .

Now i have gotten rid of the centre diff braces i had to use on the Tekno mount, a lot cleaner looking:wink:

Also received my custom one piece battery trays , perfect .
They clear the diff nicely , sit on the mudguard spot on and best of all i can now use my Zippy packs along with the enerland cells .
After speaking to Jeff i also got the front wall of the tray machined thicker for those hard lawn dart accidents :oops:

Looks great! Keep us updated on how it runs. :yes: Does the spur gear go wider than the motor mount? Thats what it looks like in the picture... I just noticed it because usually his motor mounts are just a touch wider than the spur gear, so that the battery tray can be as close as possible and it looks like you have quite a bit of extra room to push the battery a little closer toward the center. :wink:

Just checked for you .
Looks like the spur is borderline with the end of mount .
That pic does make the tray look like it's got a mile between it and the spur , just measured it has 3mm clearance. I could move it over a touch more , within 1mm of the spur but don't want to in case of an accident , wouldn't want that spur anywere near the lipo .

How much clearance do you have between tray and spur ?

On my 8ight, I'd say there is about 1/2 to 3/4 of a millimeter clearance between the tray and motor mount. But the motor mount goes about 2 to 3 mm past the spur gear. So I think thats a fairly safe distance. :yes: Yah, looking back at the picture, it definitely makes it look more than 3mm. :wink: :yes:

Sweet i'll keep it at that distance then .

Understand what you mean though , if the mount came past the spur it would act like a guard :wink:

Was wondering, ffactory, what zippos are u refering to? The 4s 5000mah ones (the ones i was looking at) were 50 or 51mm wide and all batt trays i could find are only 48mm. Did u get mike to custom cut it? Also is it winter or spring down under right now?:intello: When is the best time to visit? Can i stay at your place to save money?:lol:

It's winter at the moment , definately wait for summer .
You scratch my back i scratch yours so you can return the favour when i visit the US :lol:

I have the Zippy 5s H pack so it's 50 mm wide . Mike made me two custom one piece trays the length of the Enerland cells at 168mm and 50 mm wide for the Zippys .

When running the enerland cells you just pack the box with foam to make up the space in width and do the same with the Zippys to make up the space in length since the Zippys are shorter .

Also Jeff reccomended it ( thanks mate ) and i think it's a great idea , i got Mike to make the front wall thicker that way if the battery moves forward in a hard landing/ lawn dart it won't brake the front wall out of the tray .
It's very uncommon to happen but it did happen to Jeff :wink:

Thanks for clearing that up.:wink:

ffactory666,

U are doing good work here. Thanks for the pics & info. Invaluable.

Regards,
Joe Ling

No prob Joe , thats what these forums are for :wink:

ffactory666,
The motor mount does not look like the mount of CR in RCM to me. The CR mount does not have two big holes near the outside edge of the mount. I want to make sure of it.
By the way, why not just remove the i bar of X2 CRT to get rid of any correlated problem?

That is our new CR Motor mount alright - we constantly update our parts in between production runs as we go - sometime we simply find a "look" that we like, and sometimes we add some utility (mech. brake capability, for example, was not initially on any of our motor mounts). This is a benefit of being a small, low volume shop with our own parts - we can quickly update/change as we see fit. :)

100% Mikes CR mount .
Don't want to remove the centre chassis brace as it will let the chassis flex to much and effect handling .
Putting a little notch in the CR mount was no big problem , took all of 5 minutes .

Very nice build ...I'm in the process of converting a CRT-x1 truggy...my first conversion......I have the stock tire/wheel combo ..my tires seem a lot wider then yours ,what tire/wheel combo are you running ? i would like to go to the narrower tire like yours....i was afraid to notch my motor mount (same mount as yours ) as i didnt want to weaken it any ,does it seem ok with the notch ?...thank you for the help and any advice ....

I would keep the brace - those are LPR tires and wheels - They come stock on the X2...

http://thebarnfloor.com/catalog/prod...roducts_id/504

thank you for the info .. i will put the brace back on and look for those wheels...thanks again

No problem notching the mount , just do little at a time until it just clears , there is plenty of meat left on it .

As Arct1k speciified they are stock LPR tires and wheels , they look narrower because they are the largest wheel you can use under the rules so the tire is stretched out more and has less sidewall / tire looks narrower .
Tires are great they work similar to Crimefighters .

Been a while guys so thought i would post a little update , i'll be quick .

Body was done in UpgradeRC custom skins , and i am now running Lucianos 6s esc ( it's running great and if it continues to do so i will be selling my new MMM v2 ) .

I will now be using the X2 as my basher so i might go from a 15t pinion up to 17t or probably 18t as the esc ,motor and battery are staying cool , all between 95 o - 110 o .
Have been using the Zippy 5s 4000mah packs and am very happy and getting 18mins before the lvc on the esc kicks in .


I made a plate for the esc which attaches to the center diff top plate using the existing top plate mounting holes , the esc is then attached with velcro and some zip ties .

That's it for now , oh some pics as well .

That is one sweet as body. Top Job

Looks good. I hope those capacitors are secured with some kind of tape to keep them from bouncing too much and breaking off.

Done before i ran the esc :wink:

You can see the review of it in your thread .

Drift thanks for the compliment , it's quite easy though with the skins .

I'm at about 2 hours 40 mins run time with Lutachs 6S esc and it's running flawless in the truggy , has not broken a sweat and is now the permanent resident esc in the X2 .
If anyone is thinking about his esc don't hesitate , it might be big but i will take that any day if it performs the way it is .

Had a few guys drive it tonight at my mates hobby store and they were all impressed .

Destroyed the 15t pinion i had in it so dropped to a 14t , the esc ran even cooler with the Medusa motor running a bit hotter but still way within acceptable temps.

This being my first 1/8 truggy and coming from a 1/10 off road background i still can't believe how well this truggy handles , and it flies so level and is so easy to correct in the air . I think i was expecting a brushless conversion to be way out of balance .
Haven't even broken any parts yet .

That's awesome. Make some videos if possible.

Hope to get a few of the boys out for a bash and get some video footage soon .

What size spur are you running?

Stock spur , whatever that is