Tungsteno counterweight for motor mount 2.5 g

Precision to the gram: the Slot.it SISP23 tungsten counterweight for motor mount

In the preparation of a competitive slot car, every tenth of a gram counts. The SISP23 counterweight from Slot.it is made of tungsten —one of the densest metals available— and weighs 2.5 grams. Its function is clear: installed on the motor mount, it allows mass to be shifted to where the chassis needs it to improve stability, traction, and cornering behaviour.

Function and performance

Tungsten is the reference material for high-density counterweights in the world of competitive slot racing. Thanks to its high density, it occupies minimal volume for significant weight, making it especially useful when the available space within the chassis is limited. Placed on the motor mount, the SISP23 directly affects the weight distribution on the rear axle of the vehicle, influencing the load on the driving wheels.

Compatibility and installation

This counterweight is designed to integrate into the motor mounts of the Slot.it range. If you are preparing a Slot.it chassis for Sport track —the system used by Scaleauto and Slot.it— this weight fits naturally into the balance adjustment process. Refer to the specific documentation for your motor mount to confirm the most suitable mounting position.

When to add a counterweight to the motor mount?

The use of counterweights responds to specific tuning needs:

• When the car exhibits understeer or rear traction loss during acceleration.
• To compensate for the weight of modifications in the front area of the chassis.
• When seeking a more central mass distribution that improves overall stability.
• In setups with inline or anglewinder motors, where the motor geometry can alter the weight distribution compared to a conventional sidewinder.

Ideal for…

Tuners and drivers competing in club categories or in high-performance builds with Slot.it chassis, who fine-tune their cars with technical criteria before each session. It is also useful for those building or modifying their own chassis and needing to adjust the balance without resorting to improvised solutions.

Frequently asked questions

Is the SISP23 counterweight only compatible with Slot.it chassis?

It is specifically designed for the motor mounts of the Slot.it range. Its use in other chassis will depend on whether the mount dimensions are compatible. We recommend checking this before installation.

Why tungsten and not lead or another metal?

Tungsten has a much higher density than lead and is completely safe to handle. It allows for more weight to be concentrated in a smaller space, which is a real advantage when the chassis does not offer much installation margin.

How many counterweights can I install at once?

It depends on the available space on the motor mount and the total weight you wish to add. Many tuners combine several counterweights of different weights to achieve the exact balance they are looking for.

Does the counterweight affect the car's centre of gravity?

Yes, and that is precisely its function. By adding mass in a specific position, both the horizontal weight distribution and, to some extent, the height of the centre of gravity are modified. A lower centre of gravity usually translates to greater stability in corners.

Is any special tool required for installation?

Generally no, although depending on the specific design of the motor mount, it may be necessary to remove the motor or some adjacent component. Refer to the manual or resources from Slot.it for your motor mount model.

The Slot.it SISP23 is a 2.5 g tungsten counterweight designed to fit Slot.it motor mounts, allowing precise weight distribution adjustments on slot car chassis. Tungsten's high density makes it the top choice for competitive slot car tuning, offering maximum mass in minimal space. Compatible with Slot.it Sport track systems used in club racing and high-performance builds, this counterweight is a key tool for improving rear traction, cornering stability and overall balance in 1/32 scale slot cars.