Stuttering question....

[captainlip]

I have just spend 2 hours soldering my noram esc completely and motor, all is well and im insanely happy but there is one problem / adjustment ?

if you wiggle the steering when idle it causes a sudden stutter of the throttle

same if your moving if you wiggle about do a few twists and turns there is a notiable stutter in the power.

sensor lead is fitted fine, any ideas?

[markwilliamson2001]

Is it a 7.2v servo per chance? Did you fit a choke between the fet lead and ESC?

Otherwise is your speedo capacitor working okay? Is that soldered up okay?

Let us know some more info

[captainlip]

Originally Posted by markwilliamson2001

Is it a 7.2v servo per chance? Did you fit a choke between the fet lead and ESC?

Otherwise is your speedo capacitor working okay? Is that soldered up okay?

Let us know some more info

believe its a 7.2v its a savox sc1258. not sure what you mean by a choke but i dont think there is one.

soldering is a great job took lots of time over it. and the cap is soldered nicely working fine. its just when rapid steering weaving it stutters slightly, not massive problem but want it sorting non the less.

[markwilliamson2001]

That servo is 6.0v...according to savox website. This means you dont need a choke.

Only other thing is to move you receiver as far as possible away from the centre prop..it could be electrical noise effecting the receiver. Are you running 2.4Ghz or 40Mhz? Upgrading to spektrum will help. If your already running spektrum, try getting one of the capacitors that plugs into the receiver.

Cant provide much more help without looking at the electrics install in your car. Can you upload an overtop view of the car?

Cheers
Mark

[captainlip]

Originally Posted by markwilliamson2001

That servo is 6.0v...according to savox website. This means you dont need a choke.

Only other thing is to move you receiver as far as possible away from the centre prop..it could be electrical noise effecting the receiver. Are you running 2.4Ghz or 40Mhz? Upgrading to spektrum will help. If your already running spektrum, try getting one of the capacitors that plugs into the receiver.

Cant provide much more help without looking at the electrics install in your car. Can you upload an overtop view of the car?

Cheers
Mark

I believe it doesnt have a choke, running 2.4ghz the aerial is running across the top of the esc passing all the wires and lipo wires. got a spektrum in at the mo and will be getting a dx3s shortly.

what does the capacitor do on the reciever?

[paulc]

Why is the aerial running over the esc ? post pics ?

[captainlip]

Originally Posted by paulc

Why is the aerial running over the esc ?

because in the rango the reciever is by the spur and the aerial is in the front, thus having to pass the esc directly through the wires as the aerial is quite short its the only route.

[ianhaye]

can you not swap the rx and esc around so areal doesnt have to run over the esc? also try anothe servo, a dodgy servo can also cause these probs, mine even made my esc shut down sometimes.

[i4n]

Move the receiver/aerial away from the ESC (general rule of thumb, keep the aerial as far away from the 'power' electronics as possible).

The power capacitor smooths out any possible dips in voltage to keep the receiver powered up that you may get under hard acceleration. I had problems with what I thought was interference and it was this, always run one now and no problems. You can buy them from Spektrum or make them up yourself (there's instructions on oOple somewhere if you have a search).

[johnb]

I've had the same problem with a Lrp tc sphere speedo if you turned the steering left or right it would make the car stutter and lurch forward.
I only ran this speedo from new with a power cap fitted and a Futaba 2.4 receiver and Savox 1258 servo. And tried to move the receiver around the car and re-route the wiring so nothing touched but would cure the problem for a heat or two but still would come back again.

But then two weeks ago it got to the point where if you turned the steering the car would drive forward without me touching the throttle. And the only way to stop it was jamming on the brakes so checked all my settings on the radio and all okay so thought it had to be the speedo so gave it a run in practice and that's when I got the smell of burning and since then I've taken the speedo apart and near the fet's there's a small part that's burnt out so guess that may have caused the problems to start with or something else has caused it to burn out.

Since then I have put a speedpassion speedo in the car to check to see if it wasn't the radio gear at fault and no problems what so ever.

So may be worth trying a different speedo or getting someone to check the speedo out to see what the problem maybe.

[paulc]

Originally Posted by ianhaye

can you not swap the rx and esc around so areal doesnt have to run over the esc? also try anothe servo, a dodgy servo can also cause these probs, mine even made my esc shut down sometimes.

Originally Posted by i4n

Move the receiver/aerial away from the ESC (general rule of thumb, keep the aerial as far away from the 'power' electronics as possible).

The power capacitor smooths out any possible dips in voltage to keep the receiver powered up that you may get under hard acceleration. I had problems with what I thought was interference and it was this, always run one now and no problems. You can buy them from Spektrum or make them up yourself (there's instructions on oOple somewhere if you have a search).

As these guys say also if your running a pt to close i have had this problem with Savox servos but no other brands

[captainlip]

had a quick look over it this morning and i had to resolder the on off switch as the + and - were touching a few fiddles and the car wouldnt turn off, tidy little solder job later and its fixed.

not stopped the stuttering though. moved the aerial and this was to no avail. tweaked through the odd setting and still no change. you can feel it when driving.

but main time it happens in when idle IE no throttle.

[johnb]

That's what mine started doing at first as when you had the car on the table in front of you or you when to put it down for racing to test the steering the car moved forward but got to the stage that you noticed it when racing that the car wouldn't slow down or come to a halt when off the throttle.

I tried with moving the pt to a different place as thought might be getting electrical interference but still did the same thing.

And unfortunately got to the stage where the speedo burnt it's self out.

So don't know what the problem was with mine but since changing the speedo it's all been fine.

[captainlip]

I have just ordered a voltage protector and will try another servo tomorrow.

[captainlip]

ok today I tried a ko pro servo I have thats spare, and with this fitted there was not one glitch, soon as I put the savox on it stuttered again, tried 3 times and the same thing, really odd as the savox is new and no issues with the SP system I was running just with the nosram, could it be savox and nosram dont like each other?

as im selling the savox now as its no good for me what other top brands should I look at? ko pro as this spare worked perfect? or ace servo?

[captainlip]

Originally Posted by johnb

I've had the same problem with a Lrp tc sphere speedo if you turned the steering left or right it would make the car stutter and lurch forward.
I only ran this speedo from new with a power cap fitted and a Futaba 2.4 receiver and Savox 1258 servo. And tried to move the receiver around the car and re-route the wiring so nothing touched but would cure the problem for a heat or two but still would come back again.

But then two weeks ago it got to the point where if you turned the steering the car would drive forward without me touching the throttle. And the only way to stop it was jamming on the brakes so checked all my settings on the radio and all okay so thought it had to be the speedo so gave it a run in practice and that's when I got the smell of burning and since then I've taken the speedo apart and near the fet's there's a small part that's burnt out so guess that may have caused the problems to start with or something else has caused it to burn out.

Since then I have put a speedpassion speedo in the car to check to see if it wasn't the radio gear at fault and no problems what so ever.

So may be worth trying a different speedo or getting someone to check the speedo out to see what the problem maybe.

funny you say that as im running the same servo, banged on a ko propo servo and dont have a problem with it, and the savox ran perfectly with the speed passion system, i wontder if it is a problem with pearl/sxx and savox servos?

as there is no glitching and stuttering with the ko propo servo, so it cant be the speedo?

[johnb]

Yeah I was wondering if there is a problem with Lrp/Nosram speedo's and Savox servo's as did try an old Sanwa servo and worked okay for a bit but the problem did come back so could be issues with certain makes of speedo's and certain servo's and there not all truly compatible.

Good to hear the speedo is okay and working now.

[discostu]

its unlikly to be a compatibility issue with the servos it sounds more likly to be a fault in the bec circitry in the esc its also unlikly to be a voltage issue to the reciever as we use nominal 7.2volts and most modern servos run at 6volts which is regulated from the esc the capister unfortuantly was a waste of money.

the capister that spextrum intriduced was to stop the recivers shutting down when running fast mods on nimh batterys and all it does is store energy for a short period so when a low voltage situation accured momentarly the rx wouldn't shut down.

again look at your instalation is your pt next to rx is the rx next to the power wires is the rx next to the esc capasiter.

i ran savox with nosram pearl for a good year with no issues.

stu

[captainlip]

the savox constantly brings on the blue limit light when flicking the tranny wheel.

bang in an old ko propo and the blue light doesnt come on once, ive got my savox apart now to check the soldering I did when I shortened wires but all looks well.

the cap on the esc is between the motor and esc and the rx is not touching the cap.

the ko servo feels so much smoother even driving the throttle no stutters or jumps. but the ko has seen better days hence is a spare so looking for a new servo if this savox is no good

sorry for the noobness but what is the px?

[discostu]

rx=receiver
tx=transmitter
pt=personel transponder
cap=capasiter
lipo=lipo battery
nimh=nickle metal hydried battery
nicd=nicad battery

durango=the unfortunate lump of alu housing a load of radio equipment garanteed to give trouble. LOL Just kidding its a pretty good car.

stu