Problemchild
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Posts posted by Problemchild
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bargain
JJ
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the motor?
it has no brushes
and has the 3 wires and sensor cable
??
JJ
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so after sorting fitting the brushless 8.5T and the TT02B going backwards fast and forwards slow (flipping the diffs but i'm sure there MUST be a way using the ESC and transmitter) i've spent 20mins running it and the tamiya ESC held up well (c50degC according to the laser thermometer) with the motor running at only about 35degC and the tamiya battery connector just being a little warm.
so all good (for now)
Yeah racing bearing steering fitted too
i tried the 12mm metal hex but they just dont grip the drivershaft and they come off too so sticking with plastic for now
JJ
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tweaked the brushless
tidied wiring
fitted yeah racing steering upgrade
JJ
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yes - tried all sorts
set up says to put channel in reverse mode initially
do the throttle position set up (tamiya ESC states full throttle and full reverse in set up mode)
JJ
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No - the instructions for the receiver tells you to always have the plug the one way round with the black wire in a certain position - this is confirmed by them having the little tab
it doesn't say anywhere in the guides or the web to try the "servo" plug round the other way
seems silly and probably something really simple but I followed all the set up processes
there were a few posts on here about it actually but the solution was to swap wires to the motor which only works on non sensored motors
oh well
JJ
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the instructions for the ESC have instructions for reverse BUT this is about switching the reverse function on and off
looking on the internet, it seems like a VERY common problem and when it comes to sensored brushless motors there is no real solution unless the ESC has a reverse (the paired speed passion isn't able to resolve this either simply)
I tried setting the ESC up with full throttle and reverse but didn't help tbh
seems v complex for something simple
JJ
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p.s. swapping the plug in the receiver just makes it beep and not register the input
JJ
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had a go reprogramming it all day
BUT
after failing with the electrical solution i took out BOTH diffs and flipped them and now it runs fine
yay mechanical engineering triumphs over electrical once again haha
JJ
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yup - it just has a fit
seems a common problem from googling (motor and ESC agnostic)
JJ
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i'm pretty sure thats not allowed on sensored
JJ
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ok - all in and running BUT, as with the model before, i couldn't get it to run forwards 100% as it was only available in reverse.
Easy fix with the brushed as swapping the motor wires worked
on the sensored brushless thats not possible
reversing the transmitter does not solve as it just reverses the trigger and it still goes faster backwards (just when trigger is for accelerate)
ESC reverse is on
JJ
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some bits for my brushless TT02B build
JJ
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so, what we are doing with this mod is replacing the 4 plastic cog diff of the TT02 with the 3 steel cog diff of the DF02
Because the tougher diff is a 3 piece the diff casing is needed and this is the diff cup PLUS the large bevelled gear that screws onto the back of the cup from pack A (you WONT need the large white spur gear as yoou can keep your TT02 one
parts bag A (mine ordered this week from here awaiting stock) http://www.modelsport.co.uk/tamiya-parts-bag-a-df-02/rc-car-products/26642
with the diff casing make sure you get the set and not just the spur gear (i got mine off ebay this week http://www.ebay.co.uk/itm/Tamiya-0555104-DF02-Diff-Gear-Case-Gravel-Hound-Plasma-Edge-Aero-Avante-New-/182268919474?hash=item2a7012feb2:g:t-8AAOSwv0tVO5n1) <<<< i think sellers have cottoned onto this and are splitting the set and making double
JJ
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Lunchbox - it does wheelies and looks cool and is lovely and basic
however I'm in the same situation as you and I've decided to go for the Kyosho Nexxt as its a simple build so won't have me taking over and parts are mega cheap and it looks supe funky and its Kyosho so a good make. Plus it has ESC inc for £55
JJ
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the fixings that the dampers mount onto do not move around once attached to the chassis
the dampers rotate on the metal ball collar fixings
a "softer" mounting allows for flexing in the chassis, suspension movement, impact resistance etc etc
JJ
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ok - i see what you mean
yes, my beetle and lunchbox have just under 1mm of play
the nut should tighten up to the shoulder of the stub axle
with the 2 bearings in the wheel hub the wheels spins soooooo smoothly for ages
if you shim the wheel you may just add additional friction
the only play i would worry about is if the wheel rocks wobbles in the stub axle
Just trying to understand your other issue....
(sat with beetle on lap - haha)
JJ
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i have ball race - just buy bearings as they aren't much more than that
also worth buying the gearbox strengthening kit from the guy on here to stop the gears crunching
JJ
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had no issues with my build at all - was fab!
(is this a re re discussion?)
JJ
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^^ sweeeeet!!
JJ
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who knows
there is no base line as i doubt there is another chassis, set up the same, running the same same motor, esc, battery combo
it'll be fun and thats the good bit about all this
JJ
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Ha - yeah
i meant between the T and the R
has anyone used the fake BL hobby wing rip offs on ebay
the hobbywing ESC I currently have seems pretty nice with the waterproof/dust proof switching
i know ESCs are all of different rating, quality, capability but maybe it's the fault of the motor spec sheet not stating peak or standard. 60A is already massive current and would warm up a hefty spanner quite nicely - 100A is crazy
im not dismissing the advice - just asking questions to understand like I do with the uber high voltage activities I deal with at work.
If a 3000W kettle draws 12.5A then you fit a 13A fuse so if a motor draws 55A and you have a 60A ESC am I not covered?
can massively over engineer if that's deemed safest but am I missing a bit? Is it just about the additional heat generated from being close to the rating?
JJ
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Not arrived yet but that's what I'll do yes
then finish with something a bit finer
JJ
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Not arrived yet but that's what I'll do yes
then finish with something a bit finer
JJ
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So, What Have You Done Today?
in General discussions
Posted
ah sorry
no - gearbox crunches but the metal diff is on its way
yeah its good - pretty nippy acceleration.
doesn't seem to impact on the battery life too much tbh
see my thread on temps etc
JJ