The ALTA Performance 15%, 17% and 19% reduction supercharger pulleys do just  that. With the simple installation of this pulley and no other modifications will raise boost 3-5 psi, and more than 20WHP.

With a 15% and 17% pulley this rise in boost pressure will increase 15to 20 horse power. No other modifications to ECU etc., required. Customers with other existing modifications or those seeking more HP the results can be even better with the addition of a header, intake, intercooler and exhaust!

ALTA Performance was the first manufacturer to design a two piece , taper fit Mini Cooper Supercharger Pulley. Today, It is the most imitated design on the market. Now we’ve upped the ante with the ALTA Performance™ Version 2.0 Supercharger Pulley with 15%, 17% or 19% reduction.Installation is easier than ever. And results are even more fantastic.The ALTA Performance pulley features a stainless steel supercharger shaft coupler with installation site aperture and the first to offer direct torque technology. Ultra light aluminum body decreases rotational inertia and overall weight. Oversized belt retainers and belt groove teeth increase belt grip. A decorative end cap faceplate provides a clean sleek look.

Features:

Design

The ALTA Performance pulley features a stainless steel supercharger shaft coupler with installation site aperture.Independently attached to the supercharger shaft ALTA is the first to offer Direct Torque Technology (DTT). The older design uses bolts to do the job of holding each piece together, and compressing the taper.  The Direct Torque Technology (DTT) applies all twisting force from the pulley to the hub, and uses separate bolts to secure hub to shaft. This reduces the work the bolts have to do. Our new pulley is also designed to be completely balanced with in .02 grams (better than stock), keeping your supercharger bearings happy.

Direct Torque Technology (DTT) allow us to use two different materials without having problems with different material expansion rates. Our hub is made of Stainless, and the pulley body is Aluminum. The SS hub takes most of the force, and does the biggest job of securing the pulley to the shaft.  The ultra light weight 6061T6 aluminum pulley body decreases rotational inertia and overall weight. Oversized belt retainers and grooved belt teeth, decrease the possibility of belts jumping off, and increase belt grip. Cooling holes are drilled into the belt retainers to keep pulley temps in check. A decorative end cap faceplate provides a clean sleek look.

Ease of installation

Simply lift the engine, remove stock pulley using the ALTA Version 2.0 pulley puller and slide your new ALTA Performance Version 2.0 pulley directly onto the supercharger shaft, tighten bolts, and your done!  There is no reason to remove the entire supercharger to pull off and press on a pulley.

Some Unique Features

The DTT hub, and the way it secures to the supercharger shaft, makes for a great replacement part for those who have had other pulleys slip and cause damage to the supercharger shaft. Our hub can help when a previous pulley has worn the S/C shaft down as much as .020".

Since the outer pulley is held on by 3 high quality screws, and is not responsible for holding the pulley to the supercharger shaft (like the 2 piece taper fit), it can be replaced with a different size very easily. Simply remove the ALTA cap, loosen the screws, and replace! You could increase your power with a smaller size in a matter of minutes!

We don't use thread locker for a reason!  Many other pulleys use a thread locker to ensure bolts don't back out. The problem with thread locker is that it can create a false torque setting when tightening bolt. And not be fun to remove.  We have incorporated lock washers which eliminate the need for thread locker, and allows for proper torque readings when tightening bolts.