With no less than 24 hours before we were to commence testing on the Honda Fit, 2NR received a billet crank pulley hot off the CNC machine from Unorthodox Racing. Designed by the Unorthodox engineers as a replacement crank pulley for the Fit, this lightened aluminum stock diameter crank pulley lacks the underdrive feature which many consumers often shy away from. While underdrive does help improve overall horsepower gains, too much of it can cause charging problems within the electrical, power steering and water pump on your vehicle.
If you know how to change your underwear, then replacing your factory crank pulley with an Unorthodox unit shouldn't require brain surgery. Using an air compressor and impact gun will definitely make life easier when attempting to remove the crank pulley bolt. Just be sure to re-torque the crank bolt to factory specification.
Crank pulley, stickers, and instructions
19-mm socket, ratchet and compressor gun
Mechanical theory states that anytime weight is removed from a rotational mass, such as a crankshaft, will increase horsepower and torque. In this case, we used a lightened crank pulley to test this theory on the Honda Fit. Exactly how lightweight is the Unorthodox crank pulley? We weighed in the new crank pulley at 1.20 pounds while the factory unit came in at 5.05 pounds. A spin on the dyno revealed respectable horsepower and torque from 2000rpm till redline with a consistent gain of 2hp from 2000 to 4000rpm as a 4 lb-ft of torque gain over our previous exhaust run was displayed at 2000rpm to 5000rpm.
Unorthodox Racing Crank Pulley
PEAKHP 100.9 / PEAKTQ 96.3
Horsepower Gain
1500 to 3500 HP range:2 to 2
3500 to 5500 HP range: 2 to 3
5500 to redline HP range: 3 to 4
Torque Gain
1500 to 3500 TQ range: 4 to 4
3500 to 5500 TQ range: 3 to 4
5500 to redline TQ range: 2 to 3