Light weight underdrive crank pulley by jacktay

This was a project from a member from Swift Club SG who drove a swift sport - Jacktay
It was a great product with proven dyno result too.
Highly recommended if you like to gain few hp and torque.

Stock SSS Crank pulley

Light weight underdrive crank pulley by jacktay

Comparison between stock and jacktay's pulley

Anodized in red

Dyno result
Quote from JackTay "The black curve you see is my Swift Sport in stock form. 110ps at the wheel amounts to about 126.5ps at the crank, very close to the 125ps stock on paper.
The red curve is with the underdrive crank pulley. 114ps at the wheel is about 131.1ps at the crank. All in all a gain of about 4.6ps. I was more for the torque gains and was pleased to see the jump in the torque curve. "