Brushless LST2 Project, Few Questions... - RC-Monster Forums

JAILBIRD · **Brushless LST2 Project, Few Questions... -** 03.16.2009, 06:50 PM

I just grabbed a nice LST2 off RCU that is begging for a new life without the nasty heart it currently has. I am going to tear down the entire truck so I can clean the whole thing part by part, and replace a fer that are pretty beat.

The plan so far is:
-MMM 2200kv with a custom motor mount
-4s lipo (would go 5s but my ICE charger can only do 4s)
-Tekno battery box
-Full RPM arms
-Rebuild shocks
-New tires and wheels

My main question is about the trans and brakes. The truck has the foreward only conversion so I'm going to ditch the reverse servo, but should I ditch the mechanical brakes?

I'm also confused about the gearing. I'm thinking about keeping the 2-speed gearset but upgrading to the Losi TiN coated set. It looks like it's 18/70 for low and 25/63 for high gear. Is this a pretty good ratio for the brushless power?

I can't bring myself to run my UE/FLM V-Twin Maxx as a basher so thats the plan for this project. I have a habbit of sinking so much money into projects they're too nice to run, not this one though.

Thanks for any help you guys can offer to get me going in the right direction!

-JB

lincpimp · 03.16.2009, 08:25 PM

Best to ditch the 2 speed and use motor brakes. That way you can mount the batt in front of the tranny for better weight distribution.

You will need a good lipo for 4s in this heavy truck. I would run a pair of 4s packs in parallel, like some 3700 25c 4s packs.

I did a lst, check my threads.

JAILBIRD · 03.16.2009, 08:53 PM

Thanks for the advice! I did a quick search and found a TD Racing single speed adaptor. Any opinions on that? Also I was thinking about a Polyquest lipo, good choice?

-JB

lincpimp · 03.16.2009, 09:01 PM

I use the tdr single speed hub, it is the best bolt on solution I have found. I use the tdr motor mount as well, and have his colleted pinion adapter for an 8mm 1521. Well made stuff.

As far polyquest they are a good brand. I would go with the 6000 25c 4s, or the 5000 30c 4s. Both are good for 150amps cont, and that is what you need.

Or run a pair of 4s 3200-3700 packs in parallel for 6400-7200 mah total. 4s will be pushed hard in that truck.

rootar · 03.16.2009, 09:58 PM

mike is going to have some 7500 2s packs in the store before too long, i would wait for these seeing as you still need to build the truck then youll have 4s 7500 and youll never have to worry about your lipos holding up to that big truck on 4s.

lincpimp · 03.16.2009, 10:08 PM

Quote:

Originally Posted by rootar

mike is going to have some 7500 2s packs in the store before too long, i would wait for these seeing as you still need to build the truck then youll have 4s 7500 and youll never have to worry about your lipos holding up to that big truck on 4s.

Sounds like a good plan to me! Mike's lipos seem to be some of the best around...

JAILBIRD · 03.16.2009, 10:21 PM

Thanks for the info on the lipos guys! After the mention of 2 packs, I'm thinking maybe 6s (2 3s packs) isn't such a bad idea.

lincpimp, I was just looking through your LST conversion thread and got some great info and ideas of what I'm in for. I have a feeling tomorrow's visit to the LHS is going to be disapointing, they have virtualy nothing for parts instock. That should give me some time to start the tear-down and cleaning. Any suggestions what spur gear I should get?

-JB

lincpimp · 03.16.2009, 10:28 PM

Quote:

Originally Posted by JAILBIRD

Thanks for the info on the lipos guys! After the mention of 2 packs, I'm thinking maybe 6s (2 3s packs) isn't such a bad idea.

lincpimp, I was just looking through your LST conversion thread and got some great info and ideas of what I'm in for. I have a feeling tomorrow's visit to the LHS is going to be disapointing, they have virtualy nothing for parts instock. That should give me some time to start the tear-down and cleaning. Any suggestions what spur gear I should get?

-JB

Seems like 63/24 is a good place to start for gearing. That is what I run. With the stock lst2 tires that will put you in the 40s with the 2200kv motor.

rootar · 03.16.2009, 10:38 PM

mike will also have 3s 5000 packs in the exact same physical size and from the same cells....either way youll have a great setup

JAILBIRD · 03.19.2009, 07:04 PM

I ordered a ton of parts from my LHS the other day and completly tore down the entire truck. I can't believe the wear on the thing! The CVDs are actualy worn out, not even a rebuild kit would help them. I'm going to wait on the batteries untill I get the truck together (2 weeks minimum for the MMM to come in).

rootar, can you give me a link to the 3s 5000 packs?

Thanks again!

Also, I'll start a build thread when all of the parts come in.

-JB

sleebus.jones · 03.19.2009, 07:30 PM

I use the TDracing mount/single speed conversion and it's great. Very solid, and well worth the money. I've got a 2200Kv and I run it with a 6S 5000MAh Zippy H. It's a monster, and only costs $133 or so. Definitely put the pack up front like linc did, the balance up there is pretty much perfect. You'll really like the end result.

JAILBIRD · 03.19.2009, 07:47 PM

Where is the best place to buy the Zippy lipos? I ordered the TDR single-speed hub, but I think I'll try my hand at making my own mount. I have some ideas for something rock-solid. I do machining (CNC and manual) for a living. I found a nice big block of nylon at the shop that will make a nice battery tray, but I need the battery first for dimentions.

-JB

sleebus.jones · 03.19.2009, 10:09 PM

There's one place: hobbycity.com

I'd go with making a tray out of kydex. You won't have room to put anything in there that has walls greater than 0.125". Have fun with making the mount! :)