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Model Forum / Radio Controlled / Land Models / November 2006electric car going slower
My sons electric car has lost its performance going forwards. In reverse it goes ok. In fact it now runs quicker backwards than forwards. Any ideas as to whats wrong? It could be a very basic problem my son (10) has taken the model apart several times but it looks as if all the screws and cogs are in the right place but i'm no expert. We changed the batteries just in case no difference. Any help gratefully received. Gary. : My sons electric car has lost its performance going forwards. In : reverse it goes ok. In fact it now runs quicker backwards than [quoted text clipped - 3 lines] : changed the batteries just in case no difference. Any help gratefully : received. Gary. Make and model of car please > : My sons electric car has lost its performance going forwards. In > : reverse it goes ok. In fact it now runs quicker backwards than [quoted text clipped - 5 lines] > : > Make and model of car please That would help but from what has been described already I would suggest that it probably has a mechanical speed controller (MSC). MSC's have a very limited life due to a few things, dirt getting on the pads or the resistor burning out or constant reverse to forward action on the controller or very rarely the servo fails. Does the speed controller look anything like these two pictures? http://www2.gpmd.com/image/t/tamc2298.jpg http://www2.gpmd.com/image/t/tram2818.jpg If so the fix is pretty simple and you have a couple options, clean the surface of the electric connections and replace the resistor OR turn the wires around on the motor and reverse the throttle servo switch on the radio OR throw it in the bin and replace it with a electronic speed controller (ESC) which should cost you only a few more dollars than a replacement MSC unit depending on brand and features. Cheers > That would help but from what has been described already I would suggest > that it probably has a mechanical speed controller (MSC). MSC's have a very > limited life due to a few things, dirt getting on the pads or the resistor > burning out or constant reverse to forward action on the controller or very > rarely the servo fails. That would also explain why reverse runs better than forwards because reverse probably gets less of a work-out and so is in better condition.  Signature______ ___ __ /_ __/_ __/ _ )_______ ___ _/ /_____ ____ / / / // / _ / __/ -_) _ `/ '_/ -_) __/ /_/ \_, /____/_/ \__/\_,_/_/\_\\__/_/ /___/ There are 10 types of people in this world; those who understand the binary numbering system and those who don't. There's no place like 127.0.0.1. ASCII a silly question, get a silly ANSI. On a clear disk you can seek forever. > > That would help but from what has been described already I would suggest > > that it probably has a mechanical speed controller (MSC). MSC's have a very [quoted text clipped - 4 lines] > That would also explain why reverse runs better than forwards because > reverse probably gets less of a work-out and so is in better condition. Yep and the reason I suggested turning the motor wires around and reversing the servo on the controller. Basically turns the reverse controls into forwards. Like the old age discussion further up, I use to do this in the days when there was no such thing as a ESC. Cheers >> : My sons electric car has lost its performance going forwards. In >> : reverse it goes ok. In fact it now runs quicker backwards than [quoted text clipped - 25 lines] > (ESC) which should cost you only a few more dollars than a replacement MSC > unit depending on brand and features. Just to hijack this thread, I've got a new chassis for my Kyosho Lazer Alpha so it'll be running for a little while longer. Can I change the MSC (woohoo, I got to use a TLA!) for an electric one, and, if so, could anyone recommend one that would be suitable? Btw, the controller on my Alpha looks like the second link above. Cheers! > >> : My sons electric car has lost its performance going forwards. In > >> : reverse it goes ok. In fact it now runs quicker backwards than [quoted text clipped - 33 lines] > > Cheers! Yep it shouldn't be a problem. The only thing you want to base your buying on is the type of motor and battery you will be using. If your using a 7.2v battery and nothing higher with a stock motor then almost any cheap ESC will do, the only other discission you have to make is if you want a forward/brake ESC or one with forward/brake/reverse. ESC's come in variations depending on the number of cells (or volts) and the number of turns in the motor. Base your buying on this and you should be right but personally I usually buy my ESC's for the maximum in all categories that way I know I will be able to use it in future upgrades. >> >> : My sons electric car has lost its performance going forwards. In >> >> : reverse it goes ok. In fact it now runs quicker backwards than [quoted text clipped - 61 lines] > right but personally I usually buy my ESC's for the maximum in all > categories that way I know I will be able to use it in future upgrades. Thanks Richard - I'll look into this the morra, when I should be working... ;o) I'll just be using the 7.2v batteries and the standard (was it a 540?) motor that came with the car. > >> >> : My sons electric car has lost its performance going forwards. In > >> >> : reverse it goes ok. In fact it now runs quicker backwards than [quoted text clipped - 67 lines] > I'll just be using the 7.2v batteries and the standard (was it a 540?) motor > that came with the car. BTW - I don't know the similarities between the Lazer Alpha and the ZXR, but I had many great races with my ZXR. It was a awesome handling buggy and super fast. I use to run 6, 7 & 8 cell packs and either a 11T triple wind motor or a 16T double. I even took it onroad racing for a while with foam tyres and either a Porsche 911 or 65 Mustang body and had just as much fun but in the end I needed the money and sold it to a friend that destroyed it. Cheers > BTW - I don't know the similarities between the Lazer Alpha and the ZXR, > but I had many great races with my ZXR. It was a awesome handling buggy [quoted text clipped - 4 lines] > but in the end I needed the money and sold it to a friend that destroyed > it. Ah, shame - but yes, it's a fun car to drive, not that I've anything to compare it to. It's particularly fun with some foam tyres on a wet (smooth) road where it drifts quite nicely. Thanks again for replying - much appreciated! > > : My sons electric car has lost its performance going forwards. In > > : reverse it goes ok. In fact it now runs quicker backwards than [quoted text clipped - 24 lines] > > Cheers We turned the wires around, they had connectors so I simply unplugged and swapped them around. The car now goes faster forwards than backwards and Russell is happy playing with his car again thank you. PS. I couldnt view the pictures and cant make out what make of controller we have. It has a heat sink on the top and says things like digital hi frequency reversible digi pro 200 one touch setup and two LEDS. PPS. could Russell have changed the setup by mistake? The model was 2nd hand so I dont know how to do a "one touch setup" If this car is using a really cheap motor, one without replacabl brushes, the timing will change as the brushes wear. The timing wil retard in the forward direction and advance in reverse so it will ru faster in reverse than in forward. Joh -- pmpjoh > If this car is using a really cheap motor, one without replacable > brushes, the timing will change as the brushes wear. The timing will > retard in the forward direction and advance in reverse so it will run > faster in reverse than in forward. So if he just rotates the motor 180deg he should be fine, right? ;o) > If this car is using a really cheap motor, one without replacable > brushes, the timing will change as the brushes wear. The timing will [quoted text clipped - 8 lines] > pmpjohn's Profile: http://www.rcgroups.com/forums/member.php?u=6648 > View this thread: http://www.rcgroups.com/forums/showthread.php?t=599638 we swapped the wires over and then switch over the controller the motor now runs quicker forwards than backwards, thanks for your help. |
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