The Doppler S3R variator is a true technological revelation. Doppler has employed all its know how in automatic transmission variation systems. It incorporates a wide operating range and very importantly, high quality stability which is essential to the optimal performance of the transmission and power of the engine. Doppler’s engineering department has obtained such results by developing the torque correcting thrust springs in conjunction with the variator. The progression of the spring’s pressure matches perfectly the effort produced by the centrifugal weights, allowing complete operating stability of the variator. Therefore, once the variator has been correctly set up, it delivers optimal transmission performance which in turn ensures the best acceleration that your vehicle can produce. Complies with current regulations.* Piaggio Engine
