LRP SXX TC stuttering at low speed
 

I've just installed my LRP SXX TC with my 6.5t Losi motor. At slow speeds it sounds like it is cogging slightly or like the transmission is clunky. Anybody know what it could be? It has a new capacitor and the sensor lead is fine.

is it a version 2? if so they dont work with 40 meg ko radio

No it's a version 1 and I'm using a spectrum DX3S

have you tried changing your sensor lead? :eh?:

i only ask cos i had one that looked fine but was broken internally,
have you also checked the settings incase it has defaulted to a brushed setting :)

I've tried it without the sensor lead and the motor didn't turn at all so I doubt it is the sensor lead. Also it doesn't have a brushed setting.

Have a chat with Martin (Tisher) He's been having some problems too, Sounds very similar. He seems to think its his motor thats on its way out.

Hes got an X12 5.5t, What motor are you running?

Are you sure its the ESC? have you not got another to test?

It won't work at all without the sensor lead, you need to have that installed!

Definitely replace your current sensor lead with a new one. Treat the sensor lead as a perishable item. They are only a few quid.

The sensor lead was fine with the other speedo that I have replaced with the LRP. I tried it with and without the sensor lead to see if was the sensor lead causing the problem but it wasn't.

Is this the speedo you bought off ebay for £40?

Josh I have been having problems with mine over the last few weeks.
my one starts juttering like mad after about 3to5mins of racing depending on how warm my motor is before I start but when mine dos it the esc s led lights flicker with the juttering I am putting it down to my x12 thurmalling as the colder it is before I start the longer it takes for the problem to show

Yup :woot:

The leds on my speedo don't indicate anything weird and the stuttering goes away past about half throttle and it happens whatever the temp of the motor.

And now you know why it was so cheap.

Well he said that it was in perfect working condition and he was selling it due to sponsorship. Also the starting price was £30 but there was only one other person bidding on it that's why it went so cheap. The original power cap had been removed because he said that he damaged to one on his other speedo and the one from the lrp was the only one he had spare but i have used a very high quality cap to replace it so that shouldn't be the issue.

Try a spektrum power cap in the reciver that will sort it if not get a proper lrp power cap

I've tried the spectrum cap and it made no difference. The power cap that I am using is (I think) the same or slightly better than the stock LRP cap.

Is there a current Limiter on this speedo?had a similar issue with my kinetic and it turned out I had the current limited to low.

Its on the stock setting which according to the manual has no current limit.

make sure the bits in the plug are all fitting properly in the reciever,i had a similar problem and it was due to them not fitting properly,try wiggling it to see if it goes away

Right this is really bugging me now. I've tested the sensor lead and there are no electrical breaks in it. The receiver plug is fine. The power cap made no difference. It doesn't happen at the lowest speed but it seems to appear at about 1/4 throttle and go away past about 1/2 throttle. So its either the motor or the speedo. Has anybody successfully run this combo?

Also the motor seems to be getting hotter faster than when I was using the Xcelorin ESC.

Could it be that a FET has gone in the speedo?

Now things are getting even worse. I was just about to unsolder the motor to test it on another speed control when as soon as I touched the iron to the joint the RCD in my house tripped. I reset it and it tripped again this time as soon as I switched the iron on. The thing is it only does it in the socket with the cooker switch not any of the other sockets. Do I need to bin it and get a new one?

I have an LRP sxx stock spec ESC which works perfectly with LRP, speed passion and tekin redline motors, but will not work at all because of stuttering on my 2 losi 6.5 and 1 losi 8.5 motors.( although these work fine on my losi and team orion esc's)

also one of my racing friends has a TC spec esc and fitted his losi 6.5 motor to it and the same problem occured, stuttering.
changed to a tekin motor and all was fine.

In my view the losi motors just do not like the sxx esc's, please dont ask me why as i do not know, just 9 months of trying different motors has bought me to that conclusion.

Thank you, just the advice I was looking for. I'm going to try a new motor then before paying to get the esc repaired.

Does anybody know if the HPI PRO FLUX motors work with these speedos?

I have a Nosram pearl v.2 with a Tamia transpeed (LRP X12) 6.5t and 7.5t, mine is also stuttering.

I also tryed Losi 6.5t, the same problem.

I dont know what to do...?

In a few days I will try the Trinity epic 7.5t...

Software uppgrade?

Have you tried a new sensor lead?

Have the same problem with my sxx tc its the version 2. Running a 6.5 x12 octa. It cogs quite badly when just setting off/low speeds and completey goes away when past half throttle . I have tried a sxx comp v2 with the same motor sensor lead etc and it works perfectly. Has anyone sussed this out yet? might try a software update worth a shot for the £20 usb. Cheaper than another £180 esc.

Here is a thought - bad motor sensors?
 

Perhaps it could be the sensors and not the ESC? The sensors are exhangable and one or more may have gone bad/be in need of cleaning. Perhaps sensor alignment is also an explanation to why some motors work well with certain ESCs whereas others do not?

Saying a systems coggs up to half throttle makes me suspect the sensor in the motor rather than the ESC.

I've now replaced my Losi 6.5 with a LRP 6.5 and while it stuttered a bit at first it turned out that because it was a new capacitor it just needed breaking in. It's smooth as silk now.

Also my Losi 6.5 with a LRP sphere has no problems what so ever.

No capacitor should need breaking in, are you sure the problems gone away completely?

Yup, did you hear what it was like during the bury regional? Well after you had gone it started getting better and now it is smooth as a smooth thing! :woot: