Do underdrive pulleys add HP?
Underdrive pulleys will yield a small increase in horsepower anywhere from 8 to 15 hp. This is accomplished by reducing the amount of power needed to drive the engine accessories that eat up precious horsepower.
What does an underdrive damper do?
An underdrive damper reduces the accessory pulley rpm, which can lead to moderated charging system output voltage, somewhat higher engine temp at low speed rpm, and less HVAC cooling.
How much HP does a pulley add?
The engine has to spin that extra weight over 1000 times per minute (RPM) at idle alone, which explains why, after upgrading from an OEM pulley to a lightweight pulley, we typically see gains of 5-8 whp.
Is a bigger harmonic balancer better?
No matter what anybody tells you, size does matter when it comes to the harmonic balancer you use on an engine. Putting an incorrectly-sized balancer on an engine will do more than just cause it to not reach its full performance potential … it will cause serious damage to the rotating assembly.
How much HP do lightweight pulleys add?
The combination of a lighter weight pulley with reduced engine load generally yields results of 10-12 whp. Just as with a lightweight flywheel, a lightweight or lightweight underdriven set of STILLEN Performance Pulleys will make the car generally feel more lively and responsive and quicker to both gain or drop revs.
What is underdrive gear ratio?
THE UNDERDRIVE ALLOWS THE DRIVETRAIN TO USE A LOW RATIO SUCH AS A 4.11 RING AND PINION, AND CORRECTS IT TO A FINAL DRIVE RATIO SUCH AS A 5:83. DEPENDING ON MOTOR COMBINATION (AS WELL AS TOP SPEED PREFERENCE AND WHEEL SIZE) WE CAN SET YOU UP WITH THE PROPER PLANETARY RATIO AND REAR END COMBO FOR MAXIMUM TORQUE OR MPH.
Does harmonic balancer affect timing?
Misaligned timing marks Another symptom of a potential problem with the harmonic balancer is misaligned timing marks.
How much HP does a crank pulley add?
Stock Crank Pulley – Heavy, Cast Iron Construction The engine has to spin that extra weight over 1000 times per minute (RPM) at idle alone, which explains why, after upgrading from an OEM pulley to a lightweight pulley, we typically see gains of 5-8 whp.
What is overdrive underdrive?
Overdrive (OD) and underdrive (UD) are measured by using the stock ring and pinion as a baseline. OD means that an axle spins faster than stock. UD means that it spins slower. This is achieved by swapping your stock axle gears to specific ones made for the pertinent ratio you require.