Another video of bashing ;)

http://www.youtube.com/watch?v=dF3EU-2BarI

Thanks for the update and info man...

Made some changes with my motor mount and suspension setup... I'm using 15/52 gearing now with an Ofna 6 Spider CD... I'll be ordering a pair of 16 tooth pinions from Mike
so that i can run in the forties....

A few pics of the layout...


http://lh3.ggpht.com/_4vPm5E8J5HA/S_...0/DSC_4611.jpg
UE Widetrac Control Arms, FLM Bulks, UE Super Shocks and UE Knucklehead shock towers



http://lh5.ggpht.com/_4vPm5E8J5HA/S_...0/DSC_4599.jpg
My new homemade CD/Motor mount with a OFNA Spider center diff and CC 1520 attached



http://lh6.ggpht.com/_4vPm5E8J5HA/S_...0/DSC_4608.jpg



http://lh4.ggpht.com/_4vPm5E8J5HA/S_...0/DSC_4663.jpg
Upper plate finished and mount mounted


http://lh6.ggpht.com/_4vPm5E8J5HA/S_...0/DSC_4666.jpg


Hmmm... I had a funky little moment when I made test of the rebuild... saw a puff of smoke coming from the truck while it was sitting on the ground... The body was off luckily, it allowed me to unplug the Batts
immediately... i saw that one of the servo extension wires had lost it's insulation on the negative wire... i was a little worried since that extension was connected directly to the receiver... on opening the
receiver box i saw that only the extension was affected... I removed the extension from the receiver and made a check... the receiver started up right away and all functions checked out. not sure why
the wire shorted out like that tough... Well... i have no backup servo extensions, so I'll be running the 125B without its double fan 'cooling'... On plus side, this will allow me to mount the ESC a little lower :mdr:...



http://lh5.ggpht.com/_4vPm5E8J5HA/S_...2/DSC_4630.jpg



http://lh4.ggpht.com/_4vPm5E8J5HA/S_...2/DSC_4640.jpg



I'll make some tests as soon as possible and post my findings... Not sure what kind of temps I'll be getting on the esc now.


Alien

that is a beautiful home made cd motor mount!!! You have a very nice truggy there!!!
You can see no expense has been spared!

Do you think you would like to make me one of those cd mounts :)

Thanks man... some expense was spared with homemade parts :lol:... i'm not sure if I'll ever want to know how much money went into this build over the years...
hmmm... regarding the mount... it was a one off thing (materials here are scarce and I have to import almost everything i need)... So I'm not sure how feasible it would
be to make a small run on this design... besides, I wouldn't want to disrespect the site owner by peddling my stuff here...

Thanks again for the compliments dude.


Alien

Update for me :

http://img245.imageshack.us/img245/6633/1746.jpg

14/46 ===> 17/46 :lol::lol::lol:
The same deal for the motor, sames temps as 14/46 and insaaaaaaane top speed :yipi: Moreover wheelies are easier as in 14/46 (didn't touch the 70% punch control !).
But a bad thing happened... I did one time a full throttle from 0 speed, and my truggy responded by a DOUBLE standing backflip !! "OMG, WTF this 1520 is doing to my truggy :D :D !!!" ====> my out-shaft of center diff melted in the spur, blocked the diff... mugen parts are precise engineered, and the shaft enter tiely in the spur :( metal vs metal = heat, i didn't have this problem with the 14/46, but in 17/46 diff works maybe a lot more... I tried to enlarge a little the spur hole, but mugen parts are very heavy too ^^ Will see tomorrow if it works better.
anyway, this motor can handle bigger pinions and keep exactly the same temps, impressive :intello:

Powerrr!!! :lol:... are you going to make some vids with that 17 tooth setup? can't wait to see that.

Coming today :D

nuz i have this motor in my extended savage... considerably heavier than your truggy... i have it currently geared to 53mph (calculator says) and i get temps only as a high as 120degrees on the motor and less on the esc... temps are very low! i was considering gearing up but left it as it is and ill just run it on 9s when i have the funds

Good news ;) 120F is pretty cold for your savage and gearing :yipi: Today, my motor was at 110F on front and 125F on rear plate after one battery, it was sunny and ambient was 75F. I am geared for 48 mph but without a lot of ballooning :D
The video is uploading at the moment :wink:

http://www.youtube.com/watch?v=AtKp47Xz3jk

Here is the flying truggy :D

Those are some nice numbers guys :yes:... Keep the updates coming.

I ran 2 batteries this afternoon, I tried to push the motor to its limit :D

158F on the rear plate and 130F on the front after the 2 batteries, ambient was 80F, and it was on heavy grass, with 17/46 ~50mph ! There is still safety gap with the 170F limit... but on race or normal bash the temp keeps at 130-140 max on the rear plate...
45-50mph on grass is very impressive :D I love see that thing wheeling on demand, even at mid speed :D
But I am disapointed with RCM pignons... it seems to use itself pretty quickly, maybe due to the extra weight of the truggy ? I have a NOVAK one in my buggy and it's still in good shape after 250 batteries...

Today's video, nothing new, just JUMP :D

http://www.youtube.com/watch?v=ZBUrEhpPuYQ

SWEEETT!!!! Damn that thing can fly :lol:.. Great work man... can't wait to get mine going again...

some great vids there nuz!!! looks impressive! I am having teh same problems with pinions. I think i am going to swith to a plastic spur as it will stop wear on it.
I am not really worried about temps at the moment as some people say you should only get really worried if it hits 190? i am more worried about the ESC blowing! What temps are your esc?

The ESC has a thermal safety so it won't be a problem, unless you produce a huge spike of current like 100mph gearing and 0% punch control full throttle ^^
When I pushed the truggy hard while 2 batteries on grass (50mph 17/46 gearing), my motor was at 158F and ESC 150F, so it's still acceptable. Yet in 15/46 the ESC fan rarely come ON.
And yes :( RCM pinions are fragile :(, I have yet a Robinson Racing pinion and it's perfect.

well ill look into a robinson pinion.

Nuz this 1520motor works very well when geared to around 50-55mph depending on how much your truck weighs. Im weighing in at 14lbs and i dont really have temp problems and majority of the time im running on grass and the rc calc says i am geared to 53mph on 6s.

Im hoping to leave the gearing exactly as it is and run 9s for speed runs. Im sure this motor can easily handle it as the motor will be reaching 52000rpm which is acceptable. I doubt i will gear down...ill just monitor temps and see what this motor can really do

My truggy weights 4.8 kg, I don't know in lbs ^^
What is your temp after one battery on the rear black plate of the motor ? It's here where the temp is the higher. It depends on the ambient temp and how I drive it too. I doubt that continuously full throttle on grass won't overheat the motor, like all motor.
If I drive it like in the videos, hard acceleration jump, cool coming back, rejump... I dont get over120-130 with 17/46 (50mph) but during high speed runs and heavy wheelies on grass the motor seems to heat faster.

http://www.youtube.com/watch?v=iJBTqVSNGIo

Today's video, I love this truggy, purp fit it really good :D

:lol::lol:

http://img338.imageshack.us/img338/7003/cardan.jpg

I thought Mugen transmission was unbreakable :lol::lol: These are 2 rear shaft, gived up after 50 batteries 6S 4000mAh, but I bought the truck already used :D
Bad chineses shaft ? Or the badboy 1520/1Y ? :rofl:

Badboy 1520!!!! are these drive shafts? going from diff to wheels???or the centre shaft from the CD?

How did it happen? Jumping?Acceleration??

Yes, both broken near the diff output, at exactly yhe same place. I don't know how it happened ;), I'm sure it's because they becomed mechanical fragile. I often drive on grass, where the grip is good, the the rear shafts take a lot in their face :lol:
Anyway, it's unbelievable, mugen's shafts can be broken too !

actually its good you brought that to my attention...

I drive primarily on grass (think thats my reason for going through so many pinions and transmissions) so i will consider swapping the front and rear drive shafts.

Still i think 50+ runs on one set of drive shafts is pretty gd considering the abuse they take!

You already have broken transmission ? In your savage ?

What do you mean already???
I replace the gears in my tranny every 5-10 runs!!! It just cant handle the power of the motor, and because of the length of my truck, i can actually pull all the power down without too many wheelies.

Thats why i am looking into a CD conversion to lose all the extre unnecessary gears in the tranny...

The tranny means speedbox ? And your tranny's pinions arent made of steel ? yes, the center diff is the solution to avoid unnecessary wheelies and bring a fraction of the power to the front wheels ! What punch control setup do you use ?
I use 70% and my truggy still can wheeling on demand, although its center diff ^^ I use 40K center diff oil.

The Tranny is my transmission. Of course my pinions are all hardened but the gears in side the tranny are not as great.

I dont wheelie all the time as my wheel base is 17" so around 23+" over all length. And as my motor is mounted at the front, the extra weight forward helps keep the nose down. But it still wheelies on grippy surfaces.

I do not have punch control set. It is at 0. Not necessary as i have so much weight forward. Plus you are comparing your 10lbs truggy to my 14-15lbs truck (depending on lipos used) .

here are the vids of my truck performing.

http://www.youtube.com/watch?v=yxET4OFe7mM

http://www.youtube.com/watch?v=mS9ziX12FaM

As you can see... the weight forward helps keep the nose down and i can go all out on acceleration. Since the badlands, it has been performing so much better.

Ok, I am currently at work, you tube is locked here :D I will see it later. But as your punch control is set to 0, the strain on tranny is very high when you accelerate full throttle. Maybe setting it from 0 to 40-50% will increase your tranny gears lifetime ^^

NO!




haha didnt meant to be so blunt.
I love the immidiate torque... Also once you see the vids you will see what i mean by it being able to put the power down without the front lifting. Only when i use stock tires or 40 series rims and tires will it wheelie all the time, but with maxx size tires its quite controllable. I dont care about longevity of my gears... i just want pure fun.

Hopefully the CD will fix my tranny issues. And even if the spur on the CD fails, it will be easier to replace that compared to ripping my tranny out and completely rebuilding it.

OK OK ;)
How many trannys gears did you bought ? You order them by 10 ?

I just order them as they break. I have 2 trannys. One in the truck, and one rebuilt at all times. When one fails, i drop the rebuilt tranny into the truck and rebuild the broken one.

Its the only way to reduce down time...

Just saw the vids ;) This is bashing ^^ I like the speed runs in the grass ^^

You can see why my transmission keeps on failing. Just cant handle all the torque i can make use of. My diffs look perfect still, and my dog bones and all shafts are holding up very well without much sign of premature wear. My axles are showing a little wear but they are fine for a while still.

I cant wait to see what its like on 9s once i got the CD in!

9S with the 1520 ^^ Have you already a good esc for that ? Without any limitations on 9S this thing will be total overkill :D :lol:

no i am waiting for the ice hv esc for trucks to come out... I hope it comes out soon! But thats my plan! The motor could handle up to 10s so 9s for speed runs should be fun :)

And your temps ? Today for me after one 6S 4000mAh of bashing 122°F, but on the rear plate. The front of the motor was at 104°F, my truggy is geared for ~45mph Ambient was 75, but the weather wasn't sunny. My truggy weights in fact 10.8lbs. I am waiting two for the HV car ESC, wanna try maybe 8S combined with low gearing to increase a litte the speed and decrease even more temp.

The reason u keep going through tranny gears is because the stock gear that wears out is not hardened steel. You need to get the hd gear. It is hardened and will last as long as the truck. I've put about 30 runs through mine and the gear looks brand new still.

I've been running the 1520 in my LST XXL for a few weeks now on 6s. Geared for 45mph, I ran 2 packs through it yesterday back to back and at the end of the second battery, my motor temp was 117 degrees. Temp was 24 degrees (Celsius) up here in Canada. The truck can handle the power very nice, however my diff output cups are starting to notch out where the dogbones hit. I'm thinking about picking up some of Mike's Hardened diff cups (I think I saw some?).

I love this motor. It makes me smile. I couldn't imagine this motor in a Savage though, what a waste :lol: