Hi Folks
I've just bought two Tamiya TL01's (One 406 and the other a Alfa 155) locally (Amber Valley, Derbyshire), boxed and sold as running complete with an assortment of batteries, chargers and and radio gear. I've never worked with electric cars before, and so I thought I'd turn to the experts for some help and advice. My intentions are to get the cars running as cheaply as possible and let the mini-me's learn from there.
On testing both cars do indeed run although the following is evident:
Car A: 1. One front wheel spins without spinning the drive shaft - new wheel hub needed.
2. Front shocks 'stick' when rebounding - springs are good however
Car B: 1. Motor only runs at one speed fwd and reverse - and then only at the furthest throttle position. On comparison with Car A the speed seems to be about the middle of the 3. Motor smokes a little (dust?).
Both sets of radio gear (vintage stick type) work perfectly (and look new and unused), as do the chargers but all the batteries are shot - 2 reach enough volts to test the cars for a few minutes, the rest are DOA.
Basic repairs:
Car A
I can sort the wheel hub out, it's familiar to me from my savage. I'm assuming the shocks aren't oil filled and that the piston is sticking - presumably they can be stripped down and cleaned?
Car B:
By elimination and swapping parts from Car A the ceramic resistor seems to be shot. What I can't understand is why the motor runs slowly but only in the fastest throttle position. With Car A's resistor the motor seems to run fine. I can't check the motor further as one of the long mounting screws has a stripped head and i'm reluctant to try and drill it out at this point. On looking it seems that replacement MSC parts are quite vintage shall we say. It seems to me that the best option therefore is to replace the MSC with an ESC such as this one: http://www.modelsport.co.uk/modelsport-uk-sniper-rv-20-auto/rc-car-products/31775. If after that the motor seems suspect a replacement stock equivalent such as this http://www.modelsport.co.uk/hpi-saturn-motor-27t/rc-car-products/32208 is the way forward (and that the pinion gear will exchange off the existing can) although i'm not relishing drilling the screw.
Batteries:
Two new ones per car are needed - http://www.modelsport.co.uk/overlander-3300mah-7.2v-sport-stick-pack/rc-car-products/376164
I'd much appreciate any thoughts on the above, particularly replacing Car B's MSC for an ESC and how to go about this (I'm assuming it's a fairly straightforward process, and on the suitability etc of the parts I've linked to. Longer term then replacing the bushes with proper bearings will give them good experience of how a RC car works / is built / stripped / rebuilt. I don't imagine due to the age of the chassis that there will be any other hop ups that are that cost effective (other than maybe a slightly faster motor) and that by next year we'll be looking for a modern chassis.
Many thanks
craig