RCScrapyard ► Tamiya Nissan R91CP. Item #58109 Group-C Chassis. 1/10 Scale Le Mans Touring Car For Sale in The USA.
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Tamiya Nissan R91CP - #58109

1/10 Scale Electric Racing Car - Group-C Chassis:

  This Radio Controlled Model, released by Tamiya in 1992, is of the Nissan R91CP that was the 1992 Daytona 24 Hours Winner.
  The chassis for the Nissan R91CP was a long wheelbase version of the one used for the Mercedes Benz C11 (#58088) designated the "Group-C" chassis.
  The configuration of the "Group-C" chassis was similar in a number of ways to the F101, not least in that it employed a ball differential in place of the older Orbital Gear type. This gave the car improved stability when cornering and smoother, controlled acceleration out of the corner.
  The Nissan R91CP was the seventh RC model made by Tamiya, based on the "Group-C" chassis. Parts and spares are not too difficult to find.
      Rating: 44 Stars out of 5 Reviewed by: RCScrapyard     Manual.

★ Tamiya Nissan R91CP - #58109 - Group-C ★
Tamiya Nissan R91CP - #58109 Group-C


Tamiya #58109: For Sale in the USA


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Tamiya Nissan R91CP #58109 Group-C - Chassis
Tamiya Nissan R91CP #58109 Group-C Chassis
Tamiya Nissan R91CP #58109 Group-C - Body Shell
Tamiya Nissan R91CP #58109 Group-C Body Shell

Hints and Tips

How to Charge Rechargeable Batteries
for Radio Controlled Models

Ni-Cad (Nickel Cadmium) Batteries

1/  All Ni-Cad Batteries have to be Discharged soon after use. This is to avoid the dreaded "Memory" effect that on subsequent re-charges can cause a momentary drop in performance during a race. A simple discharger can be made from a car 12v bulb.

2/  Try to time your charge to complete just before a race. This will ensure maximum punch and duration. If a Ni-Cad is left to cool after a charge this advantage dissipates.

3/  The higher the charge current the more Punch the Ni-Cad battery will have (up to around 8 amps), however, the downside to this is a reduction in duration and effective battery life.

4/  Ni-Cad Batteries should be left to cool for about an hour after use before recharging. This will increase the effective life of the battery.

Ni-Mh (Nickel Metal Hydride) Batteries

1/  Never charge Ni-Mh batteries at a current higher than 4.5 amps. Although these batteries can give a higher voltage than Ni-Cad Batteries, they are much more sensitive and easy to damage if charged too quickly.

2/  Charging methods for Ni-Mh batteries can also be detrimental. The best I found was the "Slope" method. Avoid "Pulse" charging as this tends to effect crystal formation detrimentally and (it seems to kill them off) thus reduces duration over time.

3/  If using a temperature cut off charger on Ni-Mh batteries set to no more than 40 Degrees Centigrade. Any higher than this can damage the crystals.

4/  It is not necessary to discharge Ni-Mh Batteries. Unlike Ni-Cad batteries they do not develop a memory. Also, if they are totally discharged they sometimes will not charge straight after and need to be coaxed with a 10 minute trickle charge.

5/  Ni Mh Batteries can be recharged shortly after use without any discernable detrimental effects.

Li-Po (Lithium-Polymer) Batteries

1/  Li-Po batteries are a huge step forward in performance compared with Ni-Cad and Ni-Mh batteries. However, care has to be taken when charging. If certain procedures are not followed they could burst into flames or even explode, therefore I do not recommend Li-Po batteries for RC beginners.

2/  Li-Po batteries are more expensive and have a shorter effective life. Generally considered to be between 200 to 400 charge cycles compared to 1000+ for Ni-Cad and Ni-Mh.

3/  Consider a Battery pack listed as "2S 5000Mah 40c 2C".
"2S" is the number of cells in the pack, in this case 2 cells. Each cell provides around 3.7 Volts, so a 2S pack is around 7.4 Volts.
"5000Mah" (Mili-Amp-Hours) is the capacity. The amount of charge the pack can hold.
"40c" is the maximum Discharge rate. Which in our example would be calculated as 5000 (Mah) x 40 = 200000Ma (200 Amps).
"2C" is the maximum Charge rate. 1C being 5 Amps, so in our example 2 x 5 = 10 Amps.

4/  To safely charge your Li-Po Battery I would recommend a good Computerised charger, preferably one that can handle a Charge current of around 25A and always place the charging battery on a fireproof surface.

5/  Finally. NEVER leave your charging Li-Po battery unattended and NEVER EVER charge it above the recommended rate. When not in use, store with around 60% charge remaining in a fireproof box.

For More Setup Information check out my Hints and Tips page.

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Hints and Tips

Electric Motors for RC Models

Winds and Turns

Q/  What does 15x2 or 17x3 mean?
A/  The first number relates to the number of times the wires are wound round each of the 3 armature segments, the second number relates to the number of wires side by side. So a 15x2 would have 2 wires laid side by side and wrapped around each segment 15 times.

Q/  What is the difference in performance between a Low Turn motor (eg 11x1) and a High Turn motor (eg 27x1)?
A/  A Motor with Less Turns like an 11x1 means high current draw from the batteries which corresponds to less runtime, but More Power (Torque or Punch) Best for tracks with lots of corners and short straights where fast acceleration is needed. (use a small pinion)
Motors with More Turns like a 27x1 give you More runtime, but Less Power. So you get a smoother response and are therefore easier to drive. Better for less experienced drivers and Long straight, sweeping corner tracks. (with a large pinion) This is correct for Brushed, Modified and Stock Motors as well as Brushless Motors.

Q/  How do the number of winds effect a motor?
A/  A Motor with More Winds (number of wires eg 13x5) is less demanding on the battery, and smoother in acceleration. Best for low grip, slippery tracks.
A Low Wind Motor (eg 11x1) is more punchy and can be difficult to handle. Best on high grip, hot weather Tarmac, or indoor carpet, high acceleration, low speed tracks.

Advance and Retard

Q/  What is Advance and Retard?
A/  On the Endbell of a Modified Motor (where the brushes fit) you will find two screws that hold the Endbell to the Can. If these screws are slackened off slightly the Endbell can then be twisted either Clockwise (Advance) or Anticlockwise (Retard). On Sensorless Brushless Motors this adjustment can generally be made in a similar way (although there are some Brushless Motors that have fixed timing for Spec level racing). Sensored Motors can be adjusted via the ESC.

Q/  What does "Advancing" the Endbell position do?
A/  Advancing the Endbell Reduces runtime, increases Punch (acceleration) and RPM to give a higher top speed.
On the down side, for Brushed Motors, the brushes wear faster and the increased current draw creates more arcing thus increased heat and Commutator (Comm) wear. Brushless Motors can lose some efficiency at the end of a race because of overheating due to increased current draw.

Q/  What does "Retarding" the Endbell position do?
A/  On both Brushed and Brushless Motors, Retarding the Endbell Increases runtime, decreases Punch (acceleration) and RPM to give a lower top speed and for Brushed Motors, brush wear and Commutator (Comm) wear is reduced.

Brushed Motor Basics

Q/  What is the effect of hard and soft Brushes?
A/  Basically, Hard brushes give a lower current draw, so consequently give longer run times and lower torque so less punch (acceleration)
Soft Brushes on the other hand increase current draw thus give higher torque and increased acceleration. Of course the down side of this is that Soft brushes wear much faster and must be changed more often. (I change mine when they get to around 5mm)

Q/  How does changing the brush spring change the motor?
A/  If you fit Stiffer Brush Springs your motor will have More power at low revs, and also a lower top speed. I only ever fit stiff springs on bumpy tracks to reduce brush bounce.
Weaker springs reduce power but increase RPM so give less acceleration but a higher top speed. Good for long, sweeping, smooth tracks, where you can carry good speed through the corners.

For More Setup Information check out my Hints and Tips page.

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