I honestly think that someone in advertising just threw in the Pro in front of the word "kit" when they went to release it.

bump,

any updates at all? or new pics?

and brian i sent u a pm, plz reply

PM answered!

No updates yet. Still waiting for the plastic spur...

back at cha!

and any news on that?

Nope, no news yet. Getting kinda anxious now too.

yeah i bet! i hope its done soon, i hope to buy the .5 soon, just hope his mount is still in stock!

Firstly excellent thread and great project Brian. I was curious to know what you guys thought of using a Novak BL on nimhs in the CRT .5? I already have many nimh packs (good quality 4200s) and Novak GTB 5.5 system so it would be a fairly thrifty exercise for me, what do you think the performance would be like?

I have a CRT.5, GTB, 6.5, and many nimh packs. I'd like to just get the motor mount and used a hardened steel pinion. What pinion would be recommended to use with the stock spur gear?

Thanks, Scott

Hey Brian any update on this little gem? I'm getting one soon(hopefully by Friday!)
Some questions though:
Would a 4s 4000 pack fit? It is 44mm X 137mm X 26mm

Would a 4s 5000 pack fit? It is 45mm X 138mm X 40mm

This doesn't necessarily mean in your battery tray, but in general, opposite side from the servo.

Thanks!

Bye:018:

@pullstarter: Thanks. Sorry I didn't see your reply sooner - it must have slipped by. As to what motor to use; I don't know. I'm sure any S can motor will work just fine if geared appropriately for the voltage applied to get at least 30-35mph.


@GO-RIDE.com: Welcome to the forums! I'm not familiar with the GTB systems, so I can't really offer advice. I was running 16T pinion and was getting some overheating using a MM and 4600 motor on 2s. I have 12T, 13T, and 14T hardened pinions coming (hopefully today) so I should be able to find the sweet spot with one of those. I'm thinking the 13T will be the ticket.


@cemetary: No updates yet. Like I said above, I have some pinions coming. I'm hoping to be up and running for the Wed night electric-only races (that is if there is a class for the CRT.5 to fit in).

Both the 4 and 5Ah batteries are very close in size. If you aren't sure, just make a tray that will fit both. :) There is room front-to-back to fit either of those. I'm using 2s 5Ah packs, so they do fit. I also made the tray usable with 6 NiMH cells just for kicks (pretty nifty if I do say so myself :)). The pic of measurements below was posted a while back, but here it is again for your convenience:

http://scriptasylum.com/forumpics/crt5measurebi6.jpg

Uggh, the 5s 4000 is not going to fit without hanging off the side of the chassis. Looks like the highest mAh 4s pack is the 4000. Anyone know of any others that will fit?

Bye:018:

EDIT Woops! I meant 4s 5000mAh:eek: :024: :005:

Brian, thanks for the info on the pinions. I was thinking a 12 or 13 based on the other posts I've read. My motor is a 6400, but I also have a 4300 if the 6400 runs too hot. Are those pinions available from RC-Monster and are they a direct fit for a 10th scale motor (Mamba/Novak)? If not available from RC-M then were might I find them?

Thanks, Scott

[QUOTE=BrianG@GO-RIDE.com: Welcome to the forums! I'm not familiar with the GTB systems, so I can't really offer advice. I was running 16T pinion and was getting some overheating using a MM and 4600 motor on 2s. I have 12T, 13T, and 14T hardened pinions coming (hopefully today) so I should be able to find the sweet spot with one of those. I'm thinking the 13T will be the ticket.
[/QUOTE]

Complaining about not being able to fit a 5S 4000mAh pack on a vehicle this small is comparable to someone complaining that a big block V8 won't fit on their bicycle. :027:

The hardened MOD1 pinions that Mike sells are a 5mm bore. You'll need one of the bore reducers at the bottom of this page to fit them on your Novak motor:
http://www.rc-monster.com/rcm.php

LOL! :005:

@GO-RIDE: Mike has the hardened pinion in the store right now. Just go to the gears page, scroll down to the Mod1 5mm bore pinions, and open the drop-down list. You will also need the 5mm to 1/8" bore adaptors. For these, scroll down to the botton of the "RC Monster parts" page.

EDIT: Skellyo beat me to it...

@Cemetary: lol, no, I don't think 4s will fit. You'd have to have it haging off the side. But 3s should fit with careful tray fabrication. My tray sits so about 1mm away from the spur so I have options should I decide to go with 3s later.

Does anyone know the gear ratios or overall gear ratio of the stock CRT.5?

Scott

I think they use a 14T pinion, but don't hold me to that. You really can't compare the stock nitro ratio with BL though...

Well, got the pinions in today and have the CRT.5 up and running! YAY! Temps are much better, but still a little hot. But maybe that's because I put regular 2.2" wheels and Proline snake-eyes on it. :) It looks so much more like a truggy now though, and the extra ground clearance is nice.

I meant 4s 5000mAh:024:, and well when I get the CRT.5 it's gonna get a 10L running on 3s-4s.POWER!!!!!!!!!!:mad:1

Nice, we need some new pics!

Bye:018:

No can do. It's dirty now. Looks the same as before, just with bigger tires. :)

I was wondering when someone was going to do the full truck wheels. The Losi pro at my local track said it would handle poorly due to the wheels being to close together (short chassis), but I'd still like to try it for rough backyard tracks or bashing. Post some pics when you can.

What pinion did you settle on?

It seems to handle better in the backyard due to more tire area touching the ground. And it looks better too. :) Since I'm running large tires, I used the 12T pinion. For track use, I'll probably go with the stock size for cooler running.

I'm looking for the diff ratios to calculate the final drive ratio. Novak uses a formula (Trans x Spur)/Pinion = 11.0 for a 6.5 in a 1/10 off-road buggy. Due to the 4X4 and greater weight of the CRT.5 I was thinking of 12 or 13.

I can't seem to find the diff ratios in the owners manual. Any help out there with this formula?

Take a look at the first link in my sig. All the hard work has already been done. :dft012:

Your beat me to my next question. I bought a regular steel 32p 13T today for testing with the buggy sized wheels. That should be good with my high KV (6400) motor.

I guess I need to get fabricating tomorrow. I need a motor and battery mount. I'd like to buy the motor mount on this site, but I'm not sure it will be stiff enough for the steel spur to pinion interface?

Ahh...very nice work with the calc. So, (3.25 is the final trans ratio for the diffs x 46T stock spur) / 12.0 or 13.0 = about a 12T pinion. Now I know what to order.

Thanks again!

Wow - I missed this post. I actually tried 2.2 truck wheels myself a couple weeks ago. I robbed my Associated GT2 stock wheels and tires and the Bowties off my T4 and took the .5 for a spin on the track. I had some issues with the Proline splines rubbing but no issues with the Associated wheels. The few laps I did get in before I shut it down (due to the rubbing) convinced me to invest in a set of the truck tires. I went to my LHS and picked up a set of the Associated Rear wheels and the last pair of Snake-eyes. I had to order the other pair of tires and am still waiting on them. I think the extra ground clearance will offset any handling losses at the track I run at. Check out my video with the stock buggy tires and you'll see my truck constantly flipping over on the straights. The ruts and sometimes small chunks of dirt are just brutal.

Brian - did you need to re-gear for the added diameter of the snake-eyes?

On a side note I raced it for the first time a couple weeks ago in the 1/10th gas truck class ( no other electrics out that night). If I could have kept it off it's lid I probably would have done better. I think I already admitted in another thread how poorly I drive. I did open some nitro eyes though when I opened it up on the straight. :027: Two five minute quals (3rd and 2nd) and then 4th (15 seconds separating 2nd-4th - good thing I didn't have to pit :dft001: ) in the 10 min main.

10L? Why? IMO, that's just wasteful overkill for a motor in that thing. I'd also be willing to bet you'll have a hard time loading that motor enough to keep it cool in such a light vehicle.

Possibly, but I want a motor with a 5mm shaft. I don't think I could get an S sized motor with 5mm shaft. (besides a Neu 1506) Also, I don't like the idea of a bore reducer. I think a 10L on 3s should be some what tame:027:

Bye:018:

FWIW, the bore reducer Mike has now are steel and look really nice. They fit perfectly without being hard to insert, yet no slop. Pretty accurate.

I don't know, I have a MM5700 already for it. What do you guys think; 10L or 5700? I am looking for a good 35-40mph setup. I'm leaning towards the 10L...

Thanks!
Bye:018:

For that speed, I'd go with the L personally. And if you decide to go with the larger tires, you'll need it because of the added weight.

Cool, now I'm looking at 10L and the 9L(which one?). BTW I should have the crt.5 later today!

Bye:018:

Cool! How are you gonna lay it out?

Much like yours, but I don't know yet, I'll have to build it first...
I think my motor choice will depend on whether I want a blue or a purple one hmmm.....:005:

Bye:018:

I really don't see why you guys don't think a standard length motor will do 35-40 in it? Hasn't there already been someone on here that has a 4600 in theirs that went that fast?

IMO, a L can motor is still way overkill for a small vehicle like this. I'll probably be putting a GM-Racing 5.5 in mine using a bore reducer. It's close to the kv of a MM 5700, but IMO, it's a much better quality motor than the MM motor.

Has anyone sorted the Kyosho spur issue yet?

If you are going to use 2.2" tires, the added weight and overall "gearing" because of the added tire diameter, I would go with the 4600 on 3s and use a 12T pinion. Even then, things may get hot.

Nope, no plastic spur option yet.

I'm not sure if you were responding to my post or not, but I don't plan to run truck sized 2.2's, nor 3S in mine. I'll be using a Trakpower pack and the stock tires.

Yeah, I was responding to you, sorry for the confusion. :)
If you are using stock tires should be fine with a 5700 on 2s, geared with a 13T pinion.