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Part No: NME5041
A 15% reduction in the supercharger pulley diameter of the MINI Cooper S increases the boost of your MINI Cooper S by more than 4 pounds, resulting in a dyno-measured gain of over 20 horsepower AT THE WHEELS. Maximum boost is achieved at lower RPM, giving more power in the mid-range of your MINI Cooper S.
2002-2006 R53 MINI Cooper S Hatchback
[ ] Unique 3-piece supercharger pulley self-aligning design delivers superior clamping force, and doesn't pull back from the stop when tightened like 2-piece designs.
[ ] The new built in stop locates the supercharger pulley in the proper position, simplifying installation.
[ ] Optimum 15% reduction avoids over-spinning supercharger and excessive intake charge heat generated by smaller supercahrger pulley upgrades.
[ ] Includes correct length belt for proper tensioner operation.
[ ] Lightweight design with low rotational mass spins up faster than heavier steel supercharger pulleys.
The removal of the stock supercharger pulley requires a special pulley removal tool. If you are considering our pulley upgrade, take a look at NMK5041 for a kit that includes a rental pulley removal tool. (Pulley tool only works with the 'stock' pulley, not compatible with the JCW pulley.)
How Small is Too Small?
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. Remember, if you're looking for performance increase AND reliability backed by the best Warranty in the industry, the 3-piece pulley upgrade system is the right choice for you and your MINI Cooper S!
For reference, the JCW supercharger has a 11% reduction pulley, so our 15% will give your MINI another step up in performance!
And Lighter is Even Better
All steel clamp design has similar thermal expansion rate as the supercharger shaft to maintain superior clamping force over entire operating temperature range.
Locating the pulley on the shaft is easy and reliable, simply run it all the way onto the shaft until it stops. Proceed with tightening the bolts in sequence and the unique 3 piece design clamps down relentlessly on the supercharger shaft, without pulling against the stop.
This kit includes the correct length belt to keep the tensioner centered in its range, is best for performance and reliability.
See NMK5041 for a kit that includes the high quality 3-piece self-aligning supercharger pulley (2.19" diameter), shorter belt and a rental pulley removal tool.
See also NME5018 for Pulley Removal Tool by itself, or the NME5990 for Belt Tensioner Tool.
We recommend the belt be inspected regularly and replaced once a year.
Check local regulations on conformity for street use.
Mini Cooper S Supercharger Self-Aligning Pulley Upgrade
Additional Related Articles:
Get more POWER from your Supercharged MINI Cooper 'S' with the effective, economical and lightweight ULTRIK 3-piece self-aligning supercharger pulley upgrade system with belt.
- Optimum 15% reduction avoids over-spinning supercharger and excessive intake charge heat generated by smaller pulley upgrades.
- Includes correct length belt for proper tensioner operation.
- Lightweight design with low rotational mass spins up faster than heavier steel pulleys.
Pulleys reduced 16%, 17% or 19%, or using an oversized crank pulley, may spin the supercharger faster than our 15% pulley, but most of the additional boost cannot be used and can contrubute to engine and exhaust system damage. These smaller pulleys cause the supercharger to operate at higher RPM than it is designed to tolerate. Plus, the Roots type supercharger drastically looses efficiency at higher RPMs, generating excess heat as it tries to compress more air. In the process, it further overloads the barely adequate air-to-air intercoolers and causes the ECU to enrichen the mixture and pull back on ignition timing to preserve the engine. This results in lost power, poor fuel economy, lower reliability, the potential to 'meltdown' the catalytic converter and higher emissions.
Click Here for Installation Instructions On-Line
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Review of NME5041
Pros: Great quality with an incredible increase in power!! Excellent sound simply a home run! If you want 20+ HP this is it!
Cons: For experienced do it your selfers. You need two floor jacks but over all not too bad to install.. take your time. Would recommend that you rent the puller which helped tremendously and als they should rent the nelt tensioner tool whih would save time and make the job considerably easier