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Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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I just got my Ofna Jammin CRT.5 1/12 truggy Pro kit, and thought I'd do a build thread! It comes mostly assembled, but I wanted to check inside the diffs for fluid, look things over, and all that fun stuff - so I figured a build thread with pics would be interesting to anyone curious about this little truggy.
I also will be doing an electric conversion on it, so that should prove interesting as well. Right when I opened the box is when I noticed the assembly - I initially thought this being a kit, it would all be in pieces. Not so. My first impression was "wow, that's a lot of other parts this comes with", along with "wow, that's yellow". Straight away I've decided to chuck the wheels and wing at some point - but for now they'll stay until I decide the wheels I want, and color scheme (although likely the wing will be replaced with a black one). I was also happy to notice hex hardware throughout - very nice! |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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You'll notice that the kit came with the chassis you see, along with a longer optional chassis (and supporting parts). More on that later, but I've decided from the start to move things over to the longer chassis. This will give more room for my electric stuff, and I want to pull things apart to look anyway, so I might as well do it as I move.
Here's another shot of some of the hex hardware, and the 12 mm hexes that drive the wheels. Plastic is fine, but I've got some spare Tamiya aluminum clamping ones, so I'll be switching those out. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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On to the rear diff! The diffs are gear diffs, sealed and fluid filled. I topped them off a bit before reassembly. Notice the shielded bearings - the kit has shielded bearings throughout. Very nice.
Also notice the interesting teeth on the ring gear. I don't know why it's different than your standard ring gear, but it looks spiffy. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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Here's a pic of the rear of the extended chassis plate where this diff will be installed. I don't know why, but I felt compelled to take this pic.
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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While I was at it, I took a few closer pics of the rear suspension. I like how it uses hex screws to capture the hinge pins, the CVDs it comes with, the sway bars, and just the overall solid feel to this kit. I'm impressed so far.
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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Now the rear assembly is put back together, so I took a few more pics. Some didn't turn out quite as well as others. Oh well.
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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Last thing I did tonight was mount the rear assembly onto the extended chassis, I've included a pic of that. Interestingly, the longer chassis requires that the rear brace be moved to the other side of the centerline compared to the shorter chassis. Of course, Ofna supplied the part for you to do that, so no worries.
I've also included a pic of the 2 chassis together as they stand now, so you can see the length difference. Not major, but noticeable. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
its a damn sexy kit :D
dunno why they even include the short chassis anymore as it requires a small servo that IMO would die in this thing remember when I used a 1/10th non MG servo, and the truck destroyed it in 2 mins. It always astounds me how ofna sells the kit for under $100 I don't think there is one other RC manufacturer that sells anything even remotely comparable durability or quality wise priced anywhere remotely near it. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
dang you eman, now i want one. and i can actually afford it too. i priced it out as a nitro *gasp*. $250 and change plus when i signed up just now, they gave me a 25% off coupon! that means it's under $200 for everything but radio gear, fuel, fuel line and batteries. i have all that other stuff!
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
SyCo - I agree. It's a very nice quality kit, excellent price. Thanks for the heads up on it too, you got me started. It's weird to me too that they include both chassis and the "conversion" kit (parts, etc) to install on the longer one. Guess what's going on ebay when I'm done? :) But I'm guessing there are a hundred others doing the same thing.
Cumquat - nice coupon! I got one too when I registered with Ofna, but it didn't apply to sale items like this kit. Ah well. Later I'll be updating/posting links to the e-conversion items (part numbers straight from SyCo's info) so all that info is contained here too. One other side note - when I was messing with the diff, I tried taking the drive cups out just to see how it fits together, and I couldn't pull it from the ring gear (or on the other side, from the diff housing). I pulled pretty firmly, but no go. I left it at that, since I didn't HAVE to pull them off. They must be in there tight! |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
i'm not 100% it's applicable to the kit, but it will be for the engine and whatnot. at very least it'll cover shipping.
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
ORIGINAL: Eman77 SyCo - I agree. It's a very nice quality kit, excellent price. Thanks for the heads up on it too, you got me started. It's weird to me too that they include both chassis and the ''conversion'' kit (parts, etc) to install on the longer one. Guess what's going on ebay when I'm done? :) But I'm guessing there are a hundred others doing the same thing. Cumquat - nice coupon! I got one too when I registered with Ofna, but it didn't apply to sale items like this kit. Ah well. Later I'll be updating/posting links to the e-conversion items (part numbers straight from SyCo's info) so all that info is contained here too. One other side note - when I was messing with the diff, I tried taking the drive cups out just to see how it fits together, and I couldn't pull it from the ring gear (or on the other side, from the diff housing). I pulled pretty firmly, but no go. I left it at that, since I didn't HAVE to pull them off. They must be in there tight! |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
For this truggy, will a 1/10 servo do just fine? If so, could someone offer pics on how they mounted theirs? Thanks!
I have more pics/updates to post, need to get on that. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
Also trying to decide what tire to go with. I want black wheels, so the stock wheels/tires won't do. I'm thinking something a little bigger too. Badlands? Mashers? Trenchers? Dirt Hawgs? Hmm.
Won't be racing, just bashing around in whatever I can find. I'm guessing the 2.8s would be too big, so maybe 2.2s. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
ORIGINAL: Eman77 For this truggy, will a 1/10 servo do just fine? If so, could someone offer pics on how they mounted theirs? Thanks! I have more pics/updates to post, need to get on that. or you can just use the posts without the top I used a hitec 645mg seeing I stripped a futaba 4004 (thought it would be enough in a 1/12th) in 1 min flat |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
You mean one of the parts in the battery tray bits?
http://www.ofnawarehouse.com/product...oducts_id=2154 [Edit] Never mind, I see your info you put in my other "what do I need" thread. I know what to do now. :) I'll update this thread with the info too, with close up pics, as I go. Almost there! |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
For wheels and tires, I think I'm going to go with axial beadlocks (2.2s) and a set of Summit 1/16 tires. Not sure how great the gray ring will look though, so I'm still mulling it over a bit:
http://www3.towerhobbies.com/cgi-bin...?&I=LXASZP&P=7 http://www3.towerhobbies.com/cgi-bin...&I=LXTUX1&P=ML |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
just in case you didnt notice, those bead locks are narrower than normal 2.2 rims. normal rims are 2" wide, those are 1.4". and i'd go with mashers personally. because, well, why not? :):D
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
Hmm, thanks for the heads up, better look into that width thing. I thought the 2.2s that came with the kit were about 1.4 inches wide, perhaps I measured wrong...? Or wrote it wrong. Will have to check tonight.
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
ORIGINAL: Eman77 You mean one of the parts in the battery tray bits? http://www.ofnawarehouse.com/product...oducts_id=2154 [Edit] Never mind, I see your info you put in my other ''what do I need'' thread. I know what to do now. :) I'll update this thread with the info too, with close up pics, as I go. Almost there! Also use the brace that comes on that parts tree it gives the esc tray something to mount on to make it more secure Funny thing is I don't understand why ofna has no electric chassis for it cause that brace doesn't fit the SCRT10 at all, and seems to be made to fit the crt.5 only. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
I finally re-read your post in that other thread and it all makes sense, looking at the parts. Nice!
So if those Axial beadlocks are too narrow, does anybody make a 2.2" beadlock that is the proper width (around 2") for that tire? I'm just not seeing a lot for 2.2 beadlocks. Maybe I go the gluing route... |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
not that i have found, and i have looked quite a bit. those will work, they'll just make the sidewalls angle inward a bit and will make the tires balloon a bit more. as i rrecall, the closest to full width i found was something like 1.8", but those were aluminum wheels made by rc4wd and they cost something like $110 for the set. on the bright side though, they will never need replaced.
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
Looks like the standard width for 2.2" wheels seems to be in the 1.4 inch range after all. The tires tend to be near the 2" width mark (depending on the tire), so I really don't think I'll have a problem with those, or other 1.4 wide wheels. I've measured my 1/10 tires and wheels at home, looked up B4 wheel widths, you name it. 1.4 seems to be the average. Not sure where you're seeing 2" wide wheels for a standard 2.2 diameter wheel.
In fact, the stock 1/16 summit wheel is just about 1.4" wide, with those exact tires I linked to (also 1/16 summit tires), so it's fine. Now I just need to decide if I like the axials with that gray ring or not. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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So next I decided to transfer the center diff to the new chassis plate. Here's a pic of the diff as it comes, before I removed the braking material we won't need because of the electric conversion (pads, discs, etc). I did notice that even the parts that rotate to engage the brakes were using shielded bearings. Nice!
The last pic is of the center diff installed, but later you'll see that I'll swap out one of the side diff mounts with the electric motor mount, and the top brace with a box to house the Rx. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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Next up are some pics of the front suspension (assembled by Ofna). I did notice that the servo saver is part of the steering assembly (so you have no need for one on the servo horn, which I suppose is the norm for truggies). I also noticed that the steering assembly also used bearings. Again, this was impressive to me - I know it's a "pro" kit, but for this price, it's outstanding.
Notice that the front uses CVDs as the rear did, and a longer front driveshaft was included for the longer chassis. Anti sway bars also included on the front, as you see. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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Here's a pic of the front suspension installed on the longer chassis (again, later the electric motor mount and esc/radio plate will be swapped in). I also flipped the truggy over and laid the shorter chassis on top, so you could see the length difference a bit better.
As stated earlier, the longer chassis plate, and supporting parts, were included all with the kit. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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Last pic for tonight is of the front shocks, assembled. They don't come assembled, and I took a pic of all the parts involved as part of the build, but the pic quality sucked, so I'm omitting it. The bottom of the shock is sealed with 2 rubber o-rings and a plastic washer/spacer, and held in with a c-clip. I used AE green slime on the o-rings, as I normally do. Shocks are aluminum and threaded, and feel very stout.
The shocks are the same size, if not bigger (wider inside diameter?) than your typical 1/10 shocks, so they're pretty beefy. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
ORIGINAL: Eman77 So next I decided to transfer the center diff to the new chassis plate. Here's a pic of the diff as it comes, before I removed the braking material we won't need because of the electric conversion (pads, discs, etc). I did notice that even the parts that rotate to engage the brakes were using shielded bearings. Nice! The last pic is of the center diff installed, but later you'll see that I'll swap out one of the side diff mounts with the electric motor mount, and the top brace with a box to house the Rx. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
ORIGINAL: Eman77 Looks like the standard width for 2.2'' wheels seems to be in the 1.4 inch range after all. The tires tend to be near the 2'' width mark (depending on the tire), so I really don't think I'll have a problem with those, or other 1.4 wide wheels. I've measured my 1/10 tires and wheels at home, looked up B4 wheel widths, you name it. 1.4 seems to be the average. Not sure where you're seeing 2'' wide wheels for a standard 2.2 diameter wheel. In fact, the stock 1/16 summit wheel is just about 1.4'' wide, with those exact tires I linked to (also 1/16 summit tires), so it's fine. Now I just need to decide if I like the axials with that gray ring or not. i thinky you get the point:) you were making the assumption that all 2.2s were the same, when they are clearly not. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
True, they are vastly different. Which is really, really annoying. Could be "truck" vs. "buggy" wheel widths or some such. Maybe not. Who knows.
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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Trying to make a decision on tires - the tire will dictate what size wheel I need, since obviously I can get anything from 1.4 to a 2 inch width for a 2.2 diameter wheel. :)
So I want 2.2s, and am thinking either: Traxxas Canyon (1/16 Summit) Proline Dirt Hawg IIs HPI Geolanders Thoughts? Is the Traxxas tire compound worth a darn? Cool looking tire, but I'm not crazy about the compound in their Talons or Anacondas, so I'm skeptical. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
What parts are compatible with the. 5 crt? Are parts still readily available?
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
I believe it shares many parts with the Ofna SCRT10, and parts seem to be very readily available through ofnawarehouse.com for the Jammin CRT.5. Go there and look for parts on that kit, you'll see a bunch plus upgrades.
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
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I think I'll either be getting these HPI Scorch rims, or the Split 5 ones.
Any idea of there are fitment issues of either on this chassis? http://www3.towerhobbies.com/cgi-bin...&I=LXPYU3&P=ML http://www3.towerhobbies.com/cgi-bin...&I=LXEWZ9&P=ML |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
I went ahead and bought the Scorch wheels and Geolandar tires. :) Should be interesting!
Question: How are you guys securing the lid to your radio box on top of the Rx tray? Looks like maybe we should have some posts that screw in there and hold the lid on with clips, but I don't see any parts with the kit (nor have any lying around). |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
Second question is about electronics. I'm eyeballing a cheap Leopard BL setup made for 1/10. Thinking about 3930 KV, is that too much for this one? Another option is a 3300 KV. I'll be using 2s LiPo, want some fun speed, nothing crazy. By comparison, I have a MM 5700 setup in a 4WD buggy and I don't want anywhere near that speed. Kids will be driving it too, want it zippy but still reasonable.
By comparison, I had a 2400 KV system in my 1/10 Tamiya "truggy-type 4WD vehicle", and it was fun, but a little more top end wouldn't have hurt. :) |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
I love this kit. It is such a great deal from ofna. I was amazed at its quality when I did mine about a year ago. I stuffed a Werks B6 .21 buggy engine in mine and it is a screamer (Jato Killer!). It is one of the two Nitros I will be keeping. Everything ales I have is brushless. I have been considering picking up a second kit to convert to brushless. If I do I will put one of the Castle Mamba Max Pro/Neu-Castle 1410-3800kv motor combos in it. Either that or try to stuff in a Mamba Monster sytem! What servo are you using for steering? I have a Hitec 645 on mine and it does a fine job. Nice job on yours, looking forard to seeing how you finish it.
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RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
My crt.5 is arriving in the mail within the next few days. I had a great deal on Squirrel's conversion from The Toyz.
http://forums.thetoyz.com/index.php?showtopic=44595 I was thinking of drilling holes in the carbon fiber rx and esc top plate and mounting the savage xs or another waterproof box by drilling holes. edit: Squirrel said some of the the Hyper10-TT looks to be compatible too. |
RE: Ofna Jammin CRT.5 1/12 Truggy Build Thread and E-Conversion
use a 4000kv HW 65Z EZ-run
as for the radio lid its screwed down with longer screws ;) that is how it is done on the SCRT10 which that part comes from in the manual |
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