What does a pulley reduction do for your supercharger?

What does a pulley reduction do for your supercharger?

At 15% reduction, this supercharger pulley provides the most boost increase available without over-revving the supercharger at high engine RPMs. This ratio gives you added power without undue stress on the OEM supercharger or other adverse effects.

Can you adjust boost on a supercharger?

You can put a smaller pulley on the blower which increases the boost, so the answer is yes you can increase the boost but no its not as easy as it is on a turbo.

Will a smaller pulley make more boost?

A smaller pulley on the SC nose will increase its RPM, and therefor increase boost. You are essentially changing the “gearing” of the supercharger and making it “rev” faster, thus producing boost sooner. With higher rpm’s you will have higher heat.

Does the idler pulley spin?

The idler pulley is a common part that’s found on the majority of the vehicles on the road. Its primary function is to provide tension and guide the engine drive belt. Like many automotive parts, the idler pulley becomes worn over time. The pulley spins against the belt wearing down both parts.

How much HP does a 15% pulley add?

A pulley will only add 15-20 hp, and with hp deterioration over the years I doubt you were sitting at 170 when you had the pulley installed.

Does a smaller pulley spin faster?

Pulleys of Different or Same Size If a smaller pulley turns a larger one, the larger one will turn slower, but with more power available at the shaft. If a bigger pulley turns a smaller one, the smaller one will turn much faster than the bigger one but with less power available at the shaft.

Does a supercharger decrease engine life?

Assuming a properly tuned system, proper oil change and engine maintenance, and similar driving, supercharging generally will not shorten the life of an engine, just as is the case with OEM turbocharging (with proper cooldown for turbochargers. A cooldown period after driving is not necessary with supercharging).

Does a supercharger need a wastegate?

do superchargers have wastegates like turbos? No. They’re driven by the engine instead of a turbine so there is no need for one.

How can I increase the power of my supercharger?

A supercharger (like a turbocharger) works by compressing an engine’s airflow before it actually enters the engine. By adding more air, the engine can also mix in more fuel, which results in a bigger boom and, therefore, more power.

What does a reduced pulley do?

Offered in a variety of reduced diameters compared to the BMW original (11%, 13.2%, 15%, 17% 19%) the smaller diameter pulley spins the supercharger up faster, enabling it to pump more air and produce more boost, which turn raises torque and power output.

What causes an idler pulley to stop spinning?

The same kind of visible wear is likely to be seen on the belt as well. It is thanks to ball bearings that the idler pulley rotates smoothly on its shaft. When there is a problem with these bearings, the pulley could stop rotating altogether or continue rotating but with rough resistance in every spin. This is a frozen pulley.

Where does the energy from an idler pulley come from?

Energy produced by the engine comes as a result of linear motion (up and down movements of pistons) but it has to be converted into rotary motion. It is drive belts like the one on an idler pulley which transmit rotary motion from the engine crankshaft into power which can be utilized by these components.

How many miles can an idler pulley be replaced?

Taking this to be 100% of its life, you can do the math. 3 or more cracks in a 3 inch length means you have between 12,000 and 20,000 miles of use left. How is idler pulley replacement done? If you have some basic knowledge of how the pulley fits into the system, you can replace it yourself. If not, take your car to a mechanic.

Why does my idler pulley make a whining noise?

Noisy idler pulley or tensioner bearing:The idler pulley spins on a small but crucial bearing. If it wears out or is faulty, it produces a whining or screeching noise. Several of the belt-driven components can have this problem and produce the same sound.