Tamtech LWB Chassis

Four models are equipped with the long-wheelbase Tamtech chassis. For the numbering identifying these models there is some confusion because the first series in 1986 is released for sale with a 4-digit identification code, which becomes 5 digits from 1987. The 5-digit code is the one that was most widely used in catalogues until it was finally released from the market in 1992.
In addition to this confusion dictated by the identification code, these models are available in two versions:

– a ready-to-run solution in which the package includes remote control, “C.P.R.” or “Control Processing Reveiver” on-board electronics (servo + receiver + integrated speed control), 7.2 V 270 mAh battery pack, complete chassis to be built, body to be painted and stickers to be completed. In some markets the 7.2 V by 270 mAh ‘TAMPACK’ battery pack is also included, in most countries the purchase of a 12 V Tampack Quick Charger is suggested. The remote control is of Futaba origin in the ‘Attack’ version, includes the receiver incorporating the speed control and separately the micro servo for steering.

– only car in which the package includes complete chassis to be built and body to be painted and completed with stickers.

List of models released for sale

– Porsche 962C released for sale in 1986: code number 47001 car ready to race complete with electronics – remote control – battery and code number 48001 car only The body is transparent plastic to be coloured and completed with stickers. The plastic is matt so you have to colour the body with the TS series colours from the outside. The 4-digit code for this model is 2101 for the ready to race version and 2102 for the chassis and body only version.
– Lancia LC2 released for sale in 1986; code number 47002 ready to race car complete with electronics – remote control – battery and code number 48002 car only. The body is made of transparent plastic to be coloured and completed with stickers. The plastic is matt so you have to colour the body with the TS series colours from the outside. The 4-digit code for this model is 2103 for the ready-to-run version and 2104 for the chassis and body only version.
– BMW GTP released for sale in 1987; code number 47003 car ready to race complete with electronics – remote control – battery and code number 48003 car only. The body is white plastic to be coloured and completed with stickers. The 4 digit code for this model is 2107 for the ready to race version and 2105 for the chassis and body only version.
– Ford Mustang Probe GTP released for sale in 1987; code number 47004 ready to race car complete with electronics – remote control – battery and code number 48004 car only. The body is white plastic to be coloured and completed with stickers. The 4-digit code for this model is 2108 for the ready to race version and 2106 for the chassis and body only version.

There are several advertisements that Tamiya or the various importers around the world have published in trade magazines, in the image below are some examples.

Other part numbers are available:

– Porsche 962C body code number 2601 or 40001
– Lancia LC2 body code number 2601 or 40002

– BMW GTP body code number 40003

– Ford Mustang Probe GTP body code number 40004

– remote control complete with speed control receiver and servo, Tamtech 201 code number 1101 or 45001
– 7.2 V 270 mAh battery pack, Tampack code number 5530 or 55030
– 12 V 270 mAh battery pack, Tampack Quick Charger part number 5532 or 55032
– replacement motor FK-180SH Mini-Black, part number 2603 or 40003
– replacement differential complete with sprockets, part number 2605 or 40005
– replacement rims (4 pieces), part number 2604 or 40004
– replacement sponge front wheels (4 parts), part no. 2608 or 40008
– replacement sponge rear wheels (4 pieces), part no. 2608 or 40009
– set of ball bearings part number 40012
– receiver unit with speed control code number 45008

The main features of this design are:

– transmission on the two rear wheels,
– central double-shell chassis housing the speed control receiver and steering servo,
– rear system housing FK-180SH Mini-Black motor and transmission with differential. The package includes 4 sprockets with 8, 10, 12 and 14 teeth. A higher number of teeth increases the maximum speed achieved but reduces battery life and acceleration,
– independent front suspension acts directly on the steering shaft. The package includes two sets of springs: the grey springs are the normal ones and the black springs are the softer ones. The softer springs ensure better steering responsiveness and oversteer behaviour of the car,
– The rear rigid axle suspension acts between the centre shell and the rear drive unit. The guaranteed travel is minimal, but sufficient for such a compact model,
– innovative motor speed control system via the C.P.R. control unit, which stands for “Control Processing Reveiver”; an electronic board that includes the receiver and integrated motor speed control. The control unit allows proportional movement forwards and backwards. The electronics are equipped with a safety system against short-circuiting and overheating. The safety system intervenes and stops everything when the machine is used on heavy surfaces if the motor gets too hot. It is necessary to wait for the system to cool down before it can be used again, average time 15 minutes. Surfaces to be avoided are turf, carpets and surfaces covered with fine sand; for correct operation avoid dirt accumulating on the transmission, gears and differential. The power unit is delicate and suffers when exposed to rain and water,
– the four wheels are made of sponge and are the part that wears out during use, the other parts are not subject to particular wear or breakage.

The on-off contact system is an excellent piece of engineering, but it is a bit complex to assemble and if not done properly, it can generate false contacts.

The short wheelbase and long wheelbase versions of the Tamtech are completely different from each other although they take up the basic concepts, the short wheelbase being the evolution of the long wheelbase. This guide illustrates the differences between the short and long wheelbase chassis.
It is quicker to list the parts in common between the two models: rear differential, sprockets, FK-180SH Mini-Black motor, ball bearing bushings, front suspension springs, wheel hub, drive axle, CPR unit with servo and battery pack…
The scale of these products is 1/24 and all these models have very detailed ABS bodywork; the dimensions of the model are small in fact the remote control is larger than the model.
There are several static models that have exactly the same bodywork installed on the Tamtech Porsche 962C chassis model number 4×001. The main differences are:

– the cockpit windows are transparent in the static version and are black in the Tamtech version,
– the hole in the bodywork for the aerial is missing in the static version and
– different colour of the basic bodywork
Porsche 962C, main sponsor “From A” from 1989 and in 2002, bodywork in yellow, static model number 24089
Porsche 962C, main sponsor “Joest” from 1990, bodywork in white, static model number 24097
Porsche 962C, main sponsor “Shell” from 2001 and in 2008, bodywork in white static model number 24233
Porsche 962C, main sponsor “Repsol” from 2009, bodywork in white static model number 24233

In the construction manual for the static version, you can clearly see the two holes per side in the body at the height of the two doors (left image below). In the static version there are four flat-headed pins that two on each side close these holes (see pins highlighted in red in the picture on the right). These holes are in the same position in the Tamtech body and are used for the screws of the body-chassis locking system in the Tamtech version; the only modification to be made is the hole for the antenna.

It is possible to adapt many of the static bodies to the Tamtech chassis. This guide shows how to assess the technical feasibility of installing a static body on a Tamtech chassis.

Special versions

Three special versions were released for the long-wheelbase model:

For the 1988 Indianapolis 500; Tamiya released a complete model consisting of chassis, body and remote control-receiver system. The set commemorates the Supreme Oldsmobile that was the safety car for that year’s race. Only 200 coupes and 50 cabriolets of the real car were made. Tamiya prepared 200 packages of the coupe version for the race, which were given to Oldsmobile employees and their guests attending the race. The chassis used is the long-wheelbase chassis, the only difference to the models in this series is the body made of hard plastic, which alone weighs 250g. The standard models weigh a total of 300g complete with chassis and body.

For the 1994 BTCC championship; Tamiya released a complete model consisting of chassis, body and remote control-receiver system. Volvo decided to enter the touring car championship with the station wagon version of its top model: the 850. Public and press interest is very high and Tamiya releases a set based on the long-wheelbase version to commemorate this version. The differences of this chassis compared to the models released up to that time are:

– the steering rods are black, in all other models the colour is white (they can be seen under the yellow engine plug in the photo top left),
– the rims are black and of a different shape to the other models (see picture below),
– the remote control is the Futaba Megatech/Magnum Jr, in all other models it is the Futaba Attack and
– the body is coloured white and blue with black glasses, you only need to apply the stickers.

Ultraseven is a Japanese science fiction television series from the late 1970s. To commemorate this series, Tamiya released the sole body of the TDF PO-1 car that is used by the protagonists. In the series, this car is equipped with many accessories that make it invincible: missile, fog effect, rocket system that allows it to fly for short distances, tyres that are indestructible against firearms, and it reaches almost 400 km/h. The body can be installed on long-wheelbase models.

Tuning

To improve the performance of the model you can:
– change the steering tie rod system by installing metal arms that are stiffer than plastic ones to improve steering precision
– install aluminum heat sinks to better cool the motor and increase performance
– change the front suspension springs. The package includes two sets of springs: the gray springs are the normal ones and the black ones are the softer ones. The softer springs guarantee better steering response and oversteering behavior of the car. It is possible to find springs on the market that have different stiffness.
– change the pignon. The package includes 4 pignons of 8, 10, 12 and 14 teeth. A higher number of teeth increases the maximum speed reached but reduces the useful life of the battery and acceleration,
– change the FK-180SH Mini-Black series motor with a more powerful one in the FK180 or FF180 series

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