Brakes

[hugo]

Hi,

I am new to 1:5 scale racing and was wondering:
With my 1:8 scale protech enigma XG I could get the wheels to block at any speed.

With my TB2 I have big trouble getting the brakes to do a proper job.

I use as gas/brake servo the savox sc 1267 @ 6V it has 13kg/cm torque.

Is this a good enough servo for the purpose?

Hugo

[mynameismud76]

Welcome to largescale buddy.

My throttle/brake servo is around 18kg..I'm still asking for more.

A lot of TBII guys I've seen are running two multiplex digi 4 rhino's, one for steering and the other for gas/brake.

You also need to (this part is a ball-ache) setup your brake pads as well. I've set my pads so that the it's screwed down quite far, almost to the point the pads are dragging, then back the screws of 1/4 turn..no more.

Hope this helps.

[mooman007uk]

you need a servo with lots of torque for sure...i had a jr z9100T which did the job (380ozin) but stripped the horn so thru in a 5645 and it's lacking big time...you can help by making the brake lever wire hoopy things as long as they can be to aid leverage but no substitute for more power

[Pipeous]

I don't understand, I use 5745's and have my epa at about 40% and the brakes lock solid. it just takes adjusting the linkages like above, and making sure there is no binding

[hugo]

ok so the hitec 5745 have 18 kg/cm @ 6V right?
that is roughly 25% more then i have now with 13 kg/cm

i am thinking about putting another savox in parrallel but dont know if i have the space on the servo mount...any experience with two servo's in parallel?

hugo

[NutechNL]

hi hugo
i dont think 2 servos in parallel would work, invest into the new hitec one,
do a search on marktplaats, rhino servos, there is a guy named marco that sell the new hitec for 68 euro i think.. not a bad deal at all, he also sells rhino servos for cheaper.

[mynameismud76]

Firstly..COME ON HOLLAND!!!!!!

+1 NutechNL.

For all the trouble of getting another Savox in there (as you know, there's not that much room), you can get a Hitec in there..and just set up the brake pads =).

Yes, Pipeous has no issues..but that's because his pads are still quite new. But once the pads wear out a bit more, you'll notice a decrease in braking power. And this is when you need to set the screws that holds the pads (and discs) to screw down quite well.

Hope this helps =)

[mooman007uk]

my pads are half worn, they're adjusted correctly but just don't bite like they used to...I'd prefer to see a fibre disc and metal pads

[Pipeous]

Guess I'll have to cut some carbon brake discs for mine then

[mynameismud76]

Brakes are over-rated!!

:boxing:

[aidensere07]

Brakes are over-rated!!

:boxing:

just drift 180 and then plant the throttle :punk: :punk:

[mynameismud76]

just drift 180 and then plant the throttle :punk: :punk:

That's how I brake!!

Maybe that's why my tyres never last:with stupid:

[hugo]

Hi all,

I just wondered if someone has tried to fit hydraulic brakes to their TB2?

What would be best? 2 in the front wheels and one on the centre diff for the rear?

two on the cetre diff?

any thoughts on this?

hugo

[hugo]

Hi Guys,
Just to let you all know i have now installed a savox 1256 as a brake/throttle servo.
it has 20 kg/cm.
I adjusted the brake arms as suggested and brakes are now rock solid!

tx for tips everybody.

also installed a rhino digi 4 for steering , also much improved!

guess my initial set of servo's was badly advised by Toemen Modelbouw in Den Bosch, did not like their service anyway.

hugo

[NutechNL]

glad you got it sorted, how are you liking the TB2?

[hugo]

Hi,

I took the TBII out for a spinn today, on really harsh terrain.

I did a full tank, one dog bone popped after a jump and i made a roll that ripped out a shock. All was repairable on site, I think the TBII is a very robust piece of kit, off course if you see the actual abuse on rough terrain i am amazed it all stays together.

As for handeling, i am still looking for some improvement on the rear. I think the springs are to weak. You suggested the MT shocks so I will think about that. First i try to get/mod some clips to preload the rear suspension.

So quite happy with the TBII !

hugo

[Pipeous]

if you can't find clips then cut some rings of pvc pipe and cut slots in. they work pretty good. exhaust couplers work too

good luck

[NutechNL]

have you changed the oils in the shocks?
pvc preloads work and are easy to make, hows the fiberglass RR bod holding up?

are you coming to the raco 2000 open race this coming weekend? its in utrecht

[hugo]

hi,

no change in oil in shocks yet... i only checked them as discussed in the forum here that this is a good thing to do to see if they where properly filled and they where...

I figured out i have switched a spring when doing that so one of the longer springs ended up in a front side shock and vise versa ...:damn:...

So that would explain the weaker right side ...

I will test on friday als i will set up the shocks as straight up as possible and will make a pre load from PVC pipe, that would help...

hee thanks for the tip i will check out raco2000 this weekend right(or last ...)

body is holding up ok, the red finish (Gelcoat?) is hard and at the mount points some small chips come off but all ok so far.

Guess it is a bit heavy but that important to me.

all n all happy cruiser here!

hugo

[mooman007uk]

scored some carbon fibre so am gonna try making some carbon brake discs to see if they work, just have to find the motivation now to pull the centre diff, be a good time to install the new nutech locker in there too and dispense with the welded diff...should save a bit of drivetrain weight too

[mooman007uk]

so I figure as the drive cup is near round already carbon discs are going to round out real fast even with super glue on the edges...what I'm going to try instead is epoxing a 1mm carbon disc on each side of the metal disc, grinding the pad material off the steel and see how that works

[mradlin]

What about carbon pads instead of the ones on there now Moo?

[mooman007uk]

It seems that fibre discs and metal pads has always been the best way round for max brakes..why this is I don't know. I tried carbon pads on one of my nitros once befrore(can't remember which one)and it didn't improve any...with a fibre disc and metal pads though it locked em up no bother

[mradlin]

I only mentioned it as my Baja has the Vertigo carbon brake kit. (pads) They lock up and wirk great!!

[mooman007uk]

does that have steel discs?

[mradlin]

Yes it does. It was on my baja i had with me back in the summer on the island. I have been running them for over 2 years now, they still work awesome.

[Pipeous]

most of the 8th scales use a metal disc with fibre pads. I had to crazy glue the pads onto my front discs on the bike. what would also work is some gasket stuff. like some felpro stuff you cut your own with. that would have some serious grip on the metal and easy to make more. I'm going to try that myself...

[Shvelle]

It seems that fibre discs and metal pads has always been the best way round for max brakes..why this is I don't know. I tried carbon pads on one of my nitros once befrore(can't remember which one)and it didn't improve any...with a fibre disc and metal pads though it locked em up no bother

Sounds like a good plan. Will be interested to know how it works-out for you.
Curious - is there a enough room on the brake disc to epoxy a washer on each side of the center hole (to strengthen it) - while still leaving enough 'disc' exposed that the pads can clamp just the fiber?

[mooman007uk]

...i think I'll try the pads first as it'll be quicker and easier, just have to grab some 2 part epoxy.
I got a big piece of thick mr gasket stuff but I think it'll wear out too quick...would certainly grip though

[Shvelle]

D'oh - replied with wrong quote before - this is the one I meant to quote...


so I figure as the drive cup is near round already carbon discs are going to round out real fast even with super glue on the edges...what I'm going to try instead is epoxing a 1mm carbon disc on each side of the metal disc, grinding the pad material off the steel and see how that works

[mooman007uk]

pads are done and fitted. reall easy to do, took about 20mins all up. i put a bit of epoxy on each one to hlod them to the steel plates and left the springs out.
When I was putting it back togetheri think I discovered why the brakes go bad, when i first got it brakes were ok but gradually got worse to the point where I have zero brakes; as they wear the little spring holding the pads apart compresses more to the point where it won't compress any more and it then prevents the pads from clamping the disc...take the springs out and i reckon the brakes will be fine til the pads are totally worn.
Anyhow got ot back together and tried it quickly in the drive...I now have brakes again:punk: I roughed the carbon and discs up but it takes a couple of feet to grab and lock up...I think once they're bedded in it'll be pretty instant...I'll give it another try if the rain holds off later on.

http://i729.photobucket.com/albums/ww294/mooman007uk/DSC01980.jpg
http://i729.photobucket.com/albums/ww294/mooman007uk/DSC01981.jpg
http://i729.photobucket.com/albums/ww294/mooman007uk/DSC01983.jpg

[mradlin]

Looks really good!!
now they just have to work. ;)

[mooman007uk]

with the brakes full on the wheels are locked when I push it with my foot...i reckon they're going to be ok once they bed in..glad you said your vertigo ones worked well, saved me some time and carbon

[mynameismud76]

They look great!! Hope it works well.

I'm getting tired of having to scrub the discs and flatten the pads every few tanks =(

[Shvelle]

So....., have you had a chance to fire it up and take it for a run? How well do the modded pads work?

[mooman007uk]

only the quick run in the drive...if it quits raining I'll give it a longer run and see...I can pull on the servo horn and the brakes lock solid...i couldn't do that before...

[Pipeous]

I drive too slow to need brakes...

moo you need air flaps operated with an extra channel to flip out body parts like flaps on a plane

[mooman007uk]

LOL, now there's an idea

[mynameismud76]

Bugatti Veyron has air brakes:


http://www.youtube.com/watch?v=myovuS2vihM

[mooman007uk]

Ok managed to get on the track ysterday and I don't need the airbrakes the carbon ones work a treat...now to see how well they wear.

[Pipeous]

wishing I'd come over now to run. too friggin cold to work here this week. took a whole day to do 1 car yesterday. decided to not even bother today. going to tinker on the table.

[hugo]

ok, guys i have put in the 18 kg savox
AND set up the pads like suggested...

now rock solid braking! execellent!

but indeed brakes are overrated

(did land my TBII into the ditch in front of my house that was just cleaned for winter. had to jump in and save it...) fortunately no real damage other then a awful smell when cleaning. the radiobox just remained dry and the airfiltere was socked but no water in the engine.)