CRT.5 B/L Parts list..................
 

I am currently converting my CRT.5 to B/L as some know.

Parts I have now or on order:
Mamba Max esc and 5700kv motor
Hitech digital servo 5242-MG
RC-Monster CRT.5 B/L Mount
RC-Monster 16t hardened pinion 5mm mod1
RC-Monster Bore reducer 5mm to 1/8"

Parts I need to order:
Max Amps 5ah 3s lipo

Parts I might need not sure:
BEC

Ok there is my list, I am still unclear if I need a bec or not. I ave read and read but seems to me that I can not pull the info out of what I am reading to decide weather I need one or not.

Also tires tires tires.......I like to have some tire options. I am looking into these tires here for racing on hard clay/packed dirt:

http://www.prolineracing.com/product...product&id=203
http://www.prolineracing.com/product...product&id=206

I plan to use the stock pro lines Boe Ties that came with the kit on loose or bashing on grass or dirt surfaces.

I am after a set for high speed runs. I seen the foams IBJAMMIN ran, I like them, him burning up a servo has led away from them. I did wonder about cutting these foams down. here is the link to the foams:

http://www2.towerhobbies.com/cgi-bin...&I=LXCME3&P=ML

the tire ovarall is 86mm tall. The rim says 2.2" which is 56mm tall. That leaves 15 mm of foam on the outside. I wonder if I trued these down to 5 mm of foam, leaving me a 66mm oval tall tire. Then take the outer edges and round them up. Do any of you feel this would take some strain off the servo? Is it to short at 66mm, the stock tires are around 81mm.

Lastly I seen these tires and wonder if anyone has experience with them or word on them.

http://www.prolineracing.com/product...wproduct&id=10

These appear to some good bashing on road and off road tires.

Thanks for looking and your opinions are wanted, so please do not hold back let it all out. ;)

later,
NiCad

I'm not sure but is 3s a little much for the CRT.5, dont most people run 2s with it ?.

Many people say that you need a BEC on anything over 2s.

I like the extra power, that an a easy trigger finger.:dft012:

LMAO :005:

Probably mainly me. Most think 3s is OK, but I've done temp tests and it is very clear that 3s is too much. Even with a 250mA load (0.25A), the ESC BEC got quite warm quite fast.

I run these tires on pavement and grass. They are great! I think they are the perfect size for the crt.5 too. Also, there is no shortage of grip either. I highly recommend them, you just have to be careful turning at high speed on a high grip surface, you will traction roll.

Hope this helps!

Bye:018:

I have run pack after pack on 3s in my 5700 and 4600, not sure about others. Its not a bad idea to have one in case, or if you want 6v over 5v

It requires a bec to achieve 6v when using the MM?

The Dirt Hawgs are on my list. Thinking they will make great everywhere tires. Only concern is weight from all the lugs. Any word on this?


Thanks for the replys.

Yes, I have read where you have suggested a bec to others. :027:

Funny thing is that there are still people asking if it's ok to use the ESC BEC on 4s. lol.

Well is it?
















J/K :010: :007:

Here's what they look like mounted.
http://members.cox.net/gluena/CRTpainta.JPG'

Here they are working on pavement.


I just mounted up a set of 2.2 Proline Snake Eyes truck tires. Still running 13/46 gearing and a five minute quick bash put my temps at about 110 for both engine and (MM 4600) and ESC (MM on 3S Lipos). I'll need to update my build post with my recent changes.

answer the phone...:005:

That was movin... Any idea how fast?

Caller ID said it was my mother-in-law. Answering machine took a message;)


It was geared for about mid 30's. So probably right around there. No gun on it yet.:002:

I like the UBEC because it puts out 6v vers 5.2v the ESC puts out and it was aready wired into my ESC from my CRT. :) Do you need it on 3s? probably not but as BrianG said heat can be a factor although I have been running my RC18B on 4s with the Mamba and Quark ESC's without a UBEC and have not seen any heat issues I believe the small servo and weight is the reason it works in the RC18's?

Your going to have to come up with a battery mount? Keep in mind an added benifit of the mount is it also makes a great chassis brace and eliminates a lot of the flex in the chassis. :)

I actually liked your mount and planned to use the same basics.

;)

NiCad

Got my mount and pinion/bore reducer. Now time to get over to the LHS and pick up my Mamba Max. Oh getting so close......


Can anyone suggest what weighht of diff fluid to use. I am wanting to get all three diffs filled with the right the stuff first time. I have never owned a center diff vehicle. Used to race 2wd's and the only thing I race now is 4wds minis.

Thanks so much for everyones help. You guys ROCK! ;)


NiCad

Start with Jammin Jays set up it seems to be a very good starting point.:027:
http://www.jamminproducts.com/CRTset...5JHreddeer.pdf
I believe it's the same set up he used in this Vid at the Canadian nats.:017:
http://www.5spoke.com/site/op/media/...id/8012/page/1

That's where I started. And I haven't changed a thing other than running 2.2 truck tires. And I believe you are correct on that being the Canadian Winternational setup. If you look at the setup sheet it does say Red Deer Cananda 3/4/07. The dates for the event were March 1-4.

Good luck on the build and be sure to post up your progress!

IMO, starting with a "nitro" setup may be detrimental. After all, weight distribution will be quite different on a BL setup. Just my $0.02.

What, you mean you actually let your mother in law phonecalls through!?

@nicad; did you get the jaco foams?

Brian; what do you mean with 'it got hot on 3 s at 250mAh load?' the BEC on the mm controller? i thought you could use it up to 5S without any problems ? :005:

lol, the BEC. :p

I assume the initial tq is more on B/L as well you said weight distribution. I would think that some normal adjustments after driving you could bring the balance in check fairly easy.

Please set me straight and elaborate the adverse affect of a nitro set up in a B/L.

Thanks,
NiCad

btw still need a bec.....

Note I said Jays set up is a good place to start!

I like it with the brushless set up and have not changed anything yet the steering seems nice and nutral with no understeer or oversteer issues and it handles the jumps very well it's way better then starting with the stock set up.:)

There are 2 things I dont dont really like getting into because there are to many variables pinion and gearing issues and chassis set up what works for one may not work for others.:032:

I dont have a gas CRT.5 to compare to the brushless CRT.5 to see the diference in weight and balance my car is right at 50/50 front to rear and side to side balance and weighs 4lb-5oz RTR.
The center diff is going to be about the main thing to change with the brushless motor if you notice the front end diffing out under acceleration IE spining the front wheels try a heavier diff fluid and if it is trying to flip under acceleration or wheelies to much a lighter diff fluid is needed you have to find a happy medium and balance for your driving style and track conditions.:027:

Thank you sir.

Looking at rx placement and I decide to pull my micro spectrum off my brushed detta. It will fit on top the servo and no issues with the steering arm. My only concern is interference with the digital servo.

Any advise? I can move about 1/2" above the servo making a mounting plate.

Thanks,
NiCad

Spektrum is pretty resilient with noise because it is such a high frequency compared to the servo digital frequency. You can literally hear the servo, so it's probably in the audio frequency range (20Hz-20kHz), which is WAYYY below 2.4GHz, even counting harmonics. :) If you are worried about it, you could use an aluminum or carbon fiber plate between the two to help shield the radio.

I got a 7" buffer wheel set up. I polished this up. Two passes on the cutting side and two on the polish. I plan to spend a little more time with it and the most likely have the dremel on the back side to finish it up.

Got the Battery mount laid out. I plan to do the machining this week(end). Then polish it as well.

looking into making a hold down mount. Attached is a rough sketch. I was thinking these would be pretty trick. Mount at top and back. Bottom is not for sure. I hate drilling holes in the chassis. Plan to to do four of them for the battery mount plate.

If I do not attach the hold downs to the chassis I prob lose that leg all together and have a L bracket so to speak.

Any ideas or things you see that might not work please do not be shy.



Thanks,
NiCad

If I was to lose the leg I came up with a design the allows for some adjustment of the outer mount. Of course I will round the outer mount. No sharp edges. Also considered a CF plate on the out side of the battery for the mount to press on.
:017:

NiCad

The slots being on 2 diferent angles is going to be a problem trying to get the tabs in?

Velcro works great to keep the pack from sliding around and it helps cusions the impacts.

Try to keep any hard surfaces from contacting the lipo pack directly if it moves it will rub. :(