Are Under Drive Pulley(s) a good modification for the Supra TT?
Most of the crank-shaft under-drive pulleys require the removal of the factory torsional damper. This is from MKIV.com :’this is NOT an external (harmonic) balancer, as the crankshaft is fully balanced, rather it dampens both the axial twisting couples produced by the firing pulses, and the radial bending moment from the accessory drive belt.’ Basically this device provides crutial isolation between the engine driven accessories, and the crankshaft. However, removal of this can provide a 10-15rwhp gain, but at a cost for long term use.
