No... someone needs to lean over and step on the gas pedal for him! :005:

It has some quicks but it looks like it was only punched for like 1 second once or twice. careful careful :eek: ha ha ha

Well, it's been three months...and I finally have the new diff! Sorry for bringing an old topic up, but I don't think this needs a whole new topic. Here it is:

http://img74.imageshack.us/img74/450...2007336te2.jpg
http://img74.imageshack.us/img74/771...2007333ti2.jpg
http://img74.imageshack.us/img74/395...2007331ue5.jpg

This is the very first prototype diff that I've been sent to test. The outer gear-adaptor and inner diff cup are machined 7075 aluminium, with Savage 4-bevel innards. The whole unit is sealed so it can be filled with oil, and uses custom-modified 6mm outdrives (can use 8/9mm if required) and flanged bearings.

I got it all installed in the rear today and filled it with 3000wt oil in preparation for another test run...which in summary, went very well! The power and speed was incredible as it was a hot, dry day and I was able to go to the local park to really open her up...and WOW it's got some top-end! I reckon it was pushing close to 50mph on grass (with lowest motor timing), and I feel it could've gone faster still with a bit more room. While I didn't drive aggressively, the diff and everything else held up excellently. The truck also handled rough ground at speed really well, and cornered with very little chassis roll. It was very predictable and easy to drive.:027:

However...not everything went well. It was fairly hot outside (somewhere between 80 and 90F) and the rear motor was overheating far too easily. After doing several speed runs, the temperature (via telemetry) was already hitting 160F...and at one point, touched 190. I wasn't driving anythere near all the time, so this definitely needs looking at. For the time being I'll see if I can fit a fan, but hopefully a colder day will help.:013:

And I know, still no proper video yet...but I WILL get one I promise! Anyway I'll stop blabbering now lol. Thanks for looking.:018:

Holy COW! that's a diff for a 1/10th vehicle!!

Very, very nice!!

Who made it ?

Ya, very cool!

@Serum, I think FLM made it, not sure though...

Bye:018:

Pretty beefy isn't it! FLM didn't make it though. It was designed by Henry Weaver, a friend of mine (he's on www.rckingdom.co.uk forums) who's currently at college studying an engineering course of some sort. He really came through with this. Ever since the Dagger was released in 1999, people have been trying to improve the stock diff; and now that both I, and shortly he, have brushless Daggers the need for a stronger diff was urgent...so he set to work with his expertise, and some tips from me.:018:

I'm not sure if CF does qualify as 1/10th any more though; it's got a longer wheelbase than the stock Maxx trucks, but is slightly narrower...so I dunno. 1/9th? lol. The original Dagger is considered 1/10th and this thing is much bigger than that now in every dimension. Who can say? She weighs 3.7kg too, fully laden.

Anyhoo, I've now gotta go off and fiddle around with CF's CVDs...two of the drive pins backed out a bit during the run, so they need sorting (I'll probs put shrinkwrap round them to stop it happening again).:027:

Nice workmanship. Will you be making pinions to match the width of the spur? :)

Ah! So FLM didn't make the diff. Isn't FLM thinking of making diff cases out of aluminum then? I couldn't remember if it was the diff or diff case.

BTW is that the same Henry who started to make an LSD diff for the dagger? Did he ever finish it?

Bye:018:

Aragon: You can't have seen the Dagger drivetrain before..it's unlike anything else out there. The gearboxes are laterally-spinning geartrains, with the diff being the final gear inside the gearbox. There are two gearboxes, one front and one rear. This new diff actually uses the exact same teeth as stock (they're very strong), but they've been cut from the rest of the plastic casing and keyed onto the outer adaptor. It's all pretty strong stuff.:018:

Cemetry: Bingo! Yup, that's the same guy. He gave up on that project, as it was essentially a ball diff...and it just wasn't strong enough.:002: FLM might well mbe thinking of making diff cases, but they're nothing to do with this one.:027:

Yeah, there is so much potential it the little dagger it's crazy. The funny thing is that most people don't even realize it...

Cool, I like spider diffs better than ball diffs anyways...

Bye:027:

Oh I see. I haven't seen one before. Sounds interesting. :) Looking forward to the vids...

Cool!! I would guess the back motor is taking alot of pressure.
I am glad to see you got the diff to try.
That diff is diffanitely sweet material.

That diff is very nice!

That ride's just F*cking awesome.. If I had it, I'd just leave it as a shelf queen.....

Everyone remembers this truck,with good reason.

The diff looks really well done.

Maybe a bigger system in the rear than the front is a possibility,with similar revs,since it seems to be doing more work.You could have a rear biased torque split.I bet you can get this thing steering great,more ideal than a centre diff in many ways,the weight distribution looks rather good too.

Thanks for all the compliments guys! :)

I've now had a chance to do a second run with punch control completely disabled. This made a massive difference...wheras acceleration was aggressive before, now it's just downright brutal! She seems to be able to pull a wheelie at almost any speed, but it's hard to tell as I managed to crash her just a few mins into the run. :( Yup...I was doing a speed pass and simply hit the brakes a bit too hard so she somersaulted forward and landed very awkwardly. The rear turnbuckle rodends got ripped off the 'buckles and a few other minor fixable things occured, but the only real damage was a bent rear CVD bone. It's still useable, but I've already got a pair of new CVDs on the way. It was a pretty spectacular crash lol!
Despite the wheelies and increased punch, the diff is still fine. Next run I plan to go on tarmac and just go berserk with the throttle to really test it...should be fun! I'll try to get a good vid too...getting hold of someone to do it is really tricky.

Aqwut: Thanks...and I often wish I did as well lol! But nope, I built this thing to run, and run it shall. :)

Gustav...that's an interesting idea, but I can't see that it's do-able. Getting a torquier system that outputs the same RPMS on the same voltage would be pretty hard. I'm gonna fit a fan to the rear motor and see if I can get some adaptor plates to allow me to gear down further...but if that doesn't help, then another motor setup might be needed.:002: Everything on the truck was setupa nd designed with hanlding in mind, and it does pretty well...so I'm happy on that front. :)

Thanks again guys! :)

That chassis almost looks like one of the Candyman's Juggernaut creations- very intricate & stunning, but also very practical (whoever said practical had to be dull eh?). Shame about the crash but these things always happen, useful for identifying week points I guess, hehe. Where abouts in the UK do you live, shame its not near me as I have a massive park in which to drive/bash.
On the camera man front.... mount the cam to your head with some bungies!

About that forward somersaulting, you could turn the brake on your front ESC way down. Kinda like brake bias on nitros. Just a thought. Shouldn't hurt anything to have the front ESC braking only at a few percent.

Suicideneil, thanks dude. Candyman's trucks are absolutely amazing, much more impressive than this thing IMO (he cuts all his stuff by hand!:eek: )...there is a bit of a resemblance though. I'm up in Bedfordshire, so quite a distance away from you unfortunately.:002:

Dafni...good thinking! I'd restrained from differing the settings on the two ESCs when I first got them, and kinda forgot that I could do that to be honest. I'll try that out, cheers. :)

Incidentally I've managed to fix her up with the exception of the bent CVD (should still be useable)...so I'm gonna TRY to get a vid today. No promises though...

I would probably do both brakes as the rear will be lighter and slide more if
don't cut it back some. Yeah sucks about the crash. It does happen though.
Hope the video works out. For you and us.

Thanks for the tip. I've now set the front brake to 40% and the rear to 25%...which should hopefully make the truck more stable under braking. The only video I've been able to get is this one:

http://www.youtube.com/watch?v=Mrv6xdFzVGE
It's not much...I filmed it while driving on my phone, and it's just mainly blipping aroundat low throttle...apart from at the end, when my trigger finger slipped a bit! This thing has got a fair bit of power.

I'm working on getting a proper vid, I promise.

So glad for the update on your conversion. Nice Job!

Any chance that the guy who made your diff has done ay more, or has them for sale somewhere? I have a dagger that will be needing some good diffs!

Yep, he still makes them! He goes by name "Henry8601" on the RCKingdom.co.uk forums...so I'd suggest you sign up there and PM him. There's a whole thread on the "Monster Trucks" section on it too.

I suppose it is about time I updated this thread though isn't it! Well, Cold Fusion had undergone more major changes since the last update...including a revised-design carbon-fibre chassis, new carbon fibre shock tower design, a front super diff, new shocks and a few other minor things:

The chassis:
http://img.photobucket.com/albums/v6...HPIM1607lo.jpg

New shock towers and ESC plate:
http://img.photobucket.com/albums/v6...r/HPIM1635.jpg

And the truck built, minus electronics as you can see:
http://img.photobucket.com/albums/v6...r/HPIM1640.jpg
http://img.photobucket.com/albums/v6...r/HPIM1641.jpg
http://img.photobucket.com/albums/v6...r/HPIM1643.jpg

I also *finally* have a video! RCKingdom held a bash day called the "ReCKtacular" the other day, and CF was run and video'd. Unfortunately, I never got the chance to really try it out on the BMX track, but did get some speed runs in...before a rather painful crash. This was video'd by Laughing Potato on RCK, and went for a bit of a comedy aspect lol:

http://www.youtube.com/watch?v=5F3bIMBa0dE

Please bear in mind that the bodyshell wasn't properly fitted that day, as I'd run out of posts (which is why it looks odd). After the last crash on that video, it turned out that one of the shock mounting tabs on the brand-new rear shock tower had been torn clean off! I don't have a pic yet, but it'll be needing a new tower. Also, she beat a 1/8th nitro buggy in a drag race...only the once though (the other times I just couldn't get the power down due to wheelies etc). There should be a vid of that race turning up soon.

Anyway, I'll shutup now. I hope that helps Lincpimp...they're excellent diffs. Sounds like an interesting project though...what you planning on doing? :)

Thanks, Dagger. I have signed up on that forum and will PM henry as soon as I am validated. At the moment my dagger has a pair of traxxas 12t titan 550s running off a novak superduty on 3s lipo. Still has the stock chassis, but I do run evader buggy front shocks on it and have the cvd axles. I have locked the rear diff by inserting one of the spider gears in-between the other two. I like the idea of the sealed diff cause it would allow me to run heavy fluid in the rear and light in the front to allow for better power delivery and steering. Any chance you want to sell the al chassis, now that you have a cf one?:wink:

Sounds like quite a Dagger! I bet it shifts with that setup. Trust me though, you don't want the aluminium chassis...it really isn't as snice as it looks in the pics. All the drill holes are poorly aligned, and the finish isn't all that great. And one plate is slightly bent lol! Plus, I'ma afraid I've already offered to send it to Tony (guy who put it into CAD originally). Sorry mate. :(

You might find that you'll get better steering by filling the front diff with thicker fluid than the rear. This will help "pull" the front end through corners better.
You'll have to post pics of this thing tho! :)