New Hyper ST Pro
 

So I got this truggy from ebay brand new for $225 shipped :mdr: and need some help deciding on a few things.

http://www.ronnbot.com/sites/default...P3191818.s.jpg

ESC and motor? I'm thinking MMM with 2200KV, but the RX8 is looking really nice right now. I like that Tekin has a bigger motor selection. Then again, is it worth the higher price - programmer is even extra!

http://www.ronnbot.com/sites/default...P3191814.s.jpg

I want to run 6S and go 50+ mph. With 2200KV, I would use 13T pinion; if RX8, then 1700KV with 17T. Either one with the stock spur. I don't think it would run hot, but that's just a speculation.

I want to use Mike's motor mount and battery trays, but together, they're already $115. Steep, but looks really nice.

http://www.ronnbot.com/sites/default...P3191809.s.jpg

Then, I want to do it up like Arct1k's.

http://www.ronnbot.com/sites/default...P3191810.s.jpg

What do you guys think? More pictures here.

i have a couple...

http://i168.photobucket.com/albums/u180/Arct1k/082.jpg

Only thing with RC-Monster motor mount, is that motor goes too close to front or rear brace. So you cant change spur to smaller one.
I have MMM + Medusa 80mm 2200kv with 4S, but i wanna go 6S.
Only thing that is weak in this truck is rims, i have broken 3 rims just recently, and those were ST Pro rims (same as you have).

Arct1k: nice, I like the one on the left!

Jabe: thanks for the heads up! I wouldn't want to have the wheels shatter while going full speed down a road. What gearing are u using in your st?

I have center torsen with 52t spur and pinion is 14t, front and rear diffs are stock.
Well those rims have been broken because very bad landing...
Take a look at my thread for more infos My Hobao Hyper ST Pro conversion.
Btw. There is no need to make any new holes to chassis, you can manage with stock holes, even centerdiff can be flipped, you just need to raise Mikes motor mount for 1mm, to make acceptable clearance.
For 6S batterys (still coming), im going to use 11t. 52/10 is lowest gearing you can go with 36mm diameter 80mm lenght motor, without need of modification to center brace.
This calculator is very helpfull, when determining lowest gearing.

I am running 6s in a losi 8T with a Neu 1515/2.5d and MMM, recently I was running a 18tooth pinion with a 48 tooth spur and it ran hot but I was running in grass, I went down to a 16 tooth and will try that today. I run LPR tires in mine and happy with the results

here is a link

http://www.losipartshouse.com/servle...Mounted/Detail


and for the street

http://www3.towerhobbies.com/cgi-bin...&I=LXNHW8&P=FR

Completed!
 

It took a long time, but I finally got all the stuff and they're all mounted on the truggy.

I ended up with the following:

• MMM 2200
• 2 x 3s 25c 5000mah
• Mike's motor mount - man, this is a fine piece of work!
• Custom battery trays

Running 14t (Losi) pinion gear on stock spur. I can't fit a smaller spur without grinding something, but I think it is geared fine anyway.

http://www.ronnbot.com/sites/default...p/P5042084.jpg

http://www.ronnbot.com/sites/default...p/P5042081.jpg

http://www.ronnbot.com/sites/default...p/P5042085.jpg

Sucks that I can't run it outside because of the rain.

Nice Job! I like the dual battery trays!

Looks great man!

Looks nice!

What is that on the center diff, pinion, etc? Looks like metal shavings, but I'm guessing it could be plastic as well from your battery trays. It looks like the pinion is getting worn from the metal spur though, so you might need a hardened pinion.

I fit a 48T spur on mine, but needed to shave a couple fins on the 1515.

You should have gotten RCM pinions ;) Those losi's look soft and is wearing badly. Won't last too long like that. I think I run 15or16T/48 on a 2.5D/5S. Everything is always dead cool.

Nice job on th HST. Great truck and an awesome price.

The white stuff is soap debris - I have a habit of using soap to lubricate spurs and pinions :whistle:

I would like to use a plastic spur though. I have one on my buggy - it is quiet and works great. Is there a plastic spur do you guys know of that is around 52T and would fit for the ST?

There are no 52T spurs that I know of. Get an RC-M pinion and you won't have a problem with stripping. They're cheaper than they used to be and the only one I've ever managed to wear out was promptly replaced. My replacement has probably 100 hours of hard use on it and I have it sitting in front of me--the contact area is shiny but there's no visible wear.

Nice conversion- what did you use for battery trays?
Also, you might want to consider making a series adapter out of 10ga wire.

IDK, I can't imagine you are going to find a plastic spur to fit the spider diff. Then you are buying a whole new diff.

Interesting on the soap. Hope the pinion works out then. I've seen some guys who have bought the OEM pinions which are not hardened as well as Mike's, and they end up chewing thru them faster. For a few extra bucks, its worth getting the best if you can. Mine on the HST is about a year old and very little wear.

Non hardened steel pinions last about 10 minutes in my truck.. then you have the joy of cleaning metal shavings up

I hope the Losi pinion works out, I was under the impression that it was hardened when I purchased it.

I would have to wait until I gave the truggy a decent test to see; depending on the result, I might just order a couple RCM pinions. But, the rain just won't quit.

As for the battery trays, here are some pics from my other conversion (see the thread here):


Thanks for the comments!

The Hyper ST Pro is awesome. Turns on a dime and jumps really well; it is quite easy to control in the air and soaks up landing nicely, even the bad ones.

The truggy also proved itself durable after I gave it many beatings and so far I've only broken one part: a shock rod after hitting a storm drain.

The only thing I didn't like about it is the way it unloads to the front like crazy, but I guess thats true for most truggies. So, I replaced the fluid in the center diff with 120,000wt oil. After that, it is fine and the truck still turns well.

Here it is before all the mud and grass.

http://www.ronnbot.com/sites/default...p/P5092159.jpg

looks nice

Thanks! I'm quite satisfied with the paint job; surprisingly, I didn't screw up like usual.

http://www.ronnbot.com/sites/default...p/P5092164.jpg

How are temps when using 2200kv motor? Are you using 13t pinion?

what radio are you using?

I'm using 14T pinion. The motor doesn't run hot; about 50C/125F after running it on grass for about 15~20 minutes.

Radio is just a Spektrum DX2; I'd really like to get a DX3 though - they're nice!

if you find your diffs leaking (you will) these kyosho gaskets are a direct fit and will stop the leaks.

Im running 4S and 14t and getting 50C temps with Medusa 80mm 2200kv.
How is your setups in MMM? Im stepping up to 6S, soon as i get my connectors, so info would be helpful.

And those Kyosho gaskets are great, well havent checked diffs gear wear yet, as those mess up original shimming.

LOoks good, you could shorten your power wires a bit tho :)

I like the looks of the battery boxes

ESC temp is usually lower than the motor; around 40C~50C and the fan never turns on.

I just ordered some of those Kyosho gaskets. Thanks for the tip, Finnster!