Another LST XXL Conversion

Well i haven't made an update for a while and here's the progress.

I remade the lower plates. I now have everything ready to cut the alu angle to make my motor mount out of.

To mount the battery trays this time i have tapped the lower plate so that there is no need for a nut (8) on every mounting screw.

Also i recieved my other LST XXL. and i have installed a TD racing motor mount. This Car will have a 1717 motor and maybe 6s.

In my project LST i am running a MMMXL esc as it allows me to do heaps of stuff i couldn't before.

Hopefully this made sense as i am tired and i'm not sure what i am actually saying.

[jas21373]

yeh...we understand mate........

[DrKnow65]

Check the brushes, they are made to be serviced and come out easy. They should be more than 1/4inch long.

Just realised i haven't posted any pics of it in a running state.

My bad... I'll just copy them from the original thread.

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Just installed the MMMXL in the XXL. It is held in by 4 screws. The metal plate is screwed into the upper CD plate.






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Heres some of the logging from the first proper run. It wasn't long but it gave me an idea of stuff i need to sort out.

Yeh - last night i had the whole thing apart and i think it needs new brushes. The brushes were sparking heaps and i think that's it. I'll try and get some new ones this week but after tomorrow i wont need it for a while as i should be getting my mini mill tomorrow.

Though before i get my mini mill i need a new bench to support the mill.

[JAILBIRD]

I just came across this build, very nice! That Mamba XL looks good on that LST.

-JB

Hopefully tomorrow i'll be able to get a few more laps with this. Last time i did about 3 laps before the steering ball link popped out. This happened at the exact same time as my pinion came loose. SO when i lost both steering and throttle i thought the worst. This was also while i was running the mamba XL.

I have now epoxied the steering link in so hopefully it'll stay in. I have also gone to an ez-run/leopard 150a esc. This is because i was planning to use the Mamba XL in my truggy for the data logging but i haven't put it in yet.

I have also pretty much finished my new setup. All i need to do is make the motor mount supports, make a new upper CD plate and make the hole fro the CD in the lower plates.

I think that's it for now.

[Hyper-5]

very nice, what motor you got in there, looks like a Tekin?

yep, ATM i am running a tekin 1350. but once i get my new setup up and running i will either run a CC 1518 or a 1717 or maybe a leopard 4082 1030kv motor.

The main thing with this new setup is that i can run pretty much whatever motor i want.

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Just a quick question for everyone.

Do you think i should make a rear motor support. i am a little worried about the motor coming loose or the motor mount bending but if i have a rear motor support neither of these should happen. So what are everyones thoughts??

[Hyper-5]

l would do it just in case anything would happen, better to be safe than sorry, would you recomend a tekin 4030 2650kV? atm l have the speed passion 3.5t motor and l want my buggy to be faster, what would be the best motor

[Hyper-5]

atm my top speed on my 1/8 buggy is 99km/h and its just not quick enough for me, lve got the 150A xerun ESC and 2 3s 8000mha, lve looked everywere for the quickest motor

I'd say get a 2200kv motor. If they are able to take a MT to 100+km/h then it should be able to take a buggy far past that.

[Hyper-5]

lm looking at getting the Tekin T8 2650kV

Got bored...

So i finished the new setup. I can now run it but i haven't made the motor mount support or the motor support.

But i can use it if i want.

It may not look the best but it works. I am planning to put some thermal paste between the motor and mount as well as in between some of the plates.

just thought i might update this. The following stuff is once again copied from the original thread.

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I have now actually finished the new setup. It is ready to be installed onto the car. It may not be the prettiest but it'll work (or at least i hope it will...).

However. If/when/whatever i get a mill i will probs redo all these plates so that they are very precise to about the 0.02mm (i know, talk about anal) then i'll be happy. Also i can then do lots of stuff with the plates that i couldn't before.

If i do use a mill to redo the plate i will also redo the 'LST XXL' on the bottom of the lower plate but it should look about 100 million times cooler.

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Just finished getting my other (blue) LST up and running. I am running a feigao 580L 1643kv motor. It is about the same diameter (minus fins) but is a little shorter. For the ESC i am currently running my Mamba XL as it was out and easy to install. Servo: HS-7955TG

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o over the past two nights i have finished LD's old LST and also installed my new setup into my original LST. Everything looks good and i've also made a rear motor brace. It loos like 5hi+ but it works and i couldn't be screwed being in the shed for all of the night being eaten alive by mozzies.

I will be running a leopard 4082 1030kv motor on 4s lipo with a leopard (hobbywing) 150a esc. it is geared 23/46 so i should get about 40MPH. ATM i have to run a 46t spur as i have removed the upper big plate of the lower section (if anyone understands that, well done) so untill i get my dremel working again i can't cut the groove easily.

(anyone know where to get the brushes for a dremel in brisbane [not bunnings])

Also gave bluey (LD's LST) a run and all was good. It was on 6s lipo and the motor was getting hot so i might go up a tooth on the pinion and go down to 4s lipo.

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Raced my red LST today. It was friggen awesome, i didn't have a clean run at all but once everything is sorted out it should be sweet. For the times i was racing it was great. The steering is pretty crap but i'm learning to slide it into the corners. It's odd, you have to go too fast into a corner to make it around. If you go too slow it's difficult to get around the corner.

After about 8 mins of running (longest continuous run) the motor was at 180oF and the esc was at 120oF so i need to gear up. The problem is that i am currently running the stock diff gears (low ratio about 3.2) with a 46t spur and 23t pinion and it's undergeared. Other than that i had no other issues with the setup but one of my batts disconnected itself from the deans in the final but the transponder wasn't working anyway.

So, failures for today, steering link popped off (diff-wheel), rear centre driveshaft grub screw cam loose and cvd joint failed, front driveshaft grub screw came loose, rear driveshaft grub screw came loose, steering link came off (servo-steering link) and the battery screwed itself.

So i think i'll rebuild this sometime before the next race using locktite everywhere it's needed and i'll try to fix the steering but i don't really like my chances.

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Also gave my blue LST a run when the red one was out of action, it was good but it was terrible to drive as the tires had no traction at all and i shredded the rear diff, though after the short period of running the motor was very hot, i'm a little ashamed to say this but one reading i got was about 200oF while the other was about 195oF

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I think i might get the blue lst back into working order and get everything good then i might sell it. I just don't really need a basher ATM. I might even sell it with the old syle of lower plate so that if someone ants to they can buy the stuff needed to make it into the V1 of the custom LSTe.

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Just a little update.

Swapped out the leopard motor with a CC 1717 as the leopard was getting hot with a 23t/46t but i do have a 25t pinion if i go back to the leopard.

I have also decided to make a mount for the esc and RX. This will simply be a strip of aluminium that will run from the front of the upper CD mounting holes to where the old RX box went. This will make the ESC in the direct flow of air plus it should be easier to work on. The RC box i am thinking of using is from the old Hyper 7's/ST's. this RX box is very big and will be perfect for this area.

Also i painted the two smaller lower plates and the motor mount black the other day. It was only lexan paint as i was bored but i may regret it as it won't allow the same amount of heat transfer.

Also i have gone to a HS-7955 servo as i have installed a MGT servo saver and the only one i could get was for hitec servos. However this has made a screw sit quite high so i think i will be buying the losi HD front lower skid plate as it should protect the servo a little more. Still, if i felt really inclined i could actually make a new servo hole that would do away with some more issues i have with the LST.

Also i am thinking of getting the lower plates, upper CD plate and possibly the chassis CNC'd by a place her in brisbane but i'm not sure of they have 6061-t6 alu and how much it'll be.

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lso, just thought i might mention this, i have decided (for now) to keep the blue LST as a spares truck. I might tear it down this weekend so that i can make all the parts more portable.

Also, i should be getting my new dremel tomorrow. I tried new brushes which didn't help, called dremel who pretty much said i'll have to buy a new one as it's out of warranty. This should allow me to make the parts a little better as before i was using a jigsaw, angle grinder, hacksaws and files.

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while getting some stuff from HK i decided to get a 2.5mm thick 300x100 sheet of CF. To my surprise it seems to be good quality CF. I'll probs make the two smaller lower plates out of this CF so they wont be load bearing but should reduce some weight.

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