Description
Range Rover 4.2 L322 2009 supercharger 10% upgrade performance pulley V8. This pulley gives the supercharger a driven speed increase of 10%. Supercharger pulleys are the most proven and best £/Bhp performance enhancement available for supercharged engines.
The pulley is CNC machined from high grade stainless steel and is produced to the highest standards of surface finish and dimensional tolerances of any pulley on the market.
Changing the pulley ratio results in the supercharger working at a higher speed and producing more boost. Because this just directly increases airflow through the car’s existing sensors, the ECU is kept aware of the increased flow and no further alterations or remapping are needed to benefit from this modification (though for some models further gain can be achieved through remapping).
Boost & Power Increase:
This modification gives a 10% supercharger driven speed increase, which equates to about a 2.5psi boost pressure increase.
These upgrades have been fitted now to many cars and discussion on forums and bar stools usually refer to about a 35-40bhp/ft lb gain from this size of pulley modification. That is true for the midrange gain, though the Eaton M112 supercharger becomes less efficient at high rpm so peak power gain at high rpm may realistically be about 10-15bhp. Irrespective of the increase tailing off a little towards redline, this modification gives a great increase in instant grunt and acceleration which really does transform the car.
In some cases, belt slippage has been reported when using smaller upper pulleys, but this is attributable to some manufacturers taking a cheap route of making pulleys from aluminium alloy, which loses friction when hot. Our high-grade stainless-steel pulleys do not suffer from this problem.
Installation of the Range Rover 4.2 2009 pulley:
These pulleys are not a bolt-on fit. The original pulley has to be removed using a special puller tool, or partially cut and removed with a universal puller, then the new pulley has to be heated prior to fitting.
Please note – the 10% is the ‘harder to fit’ pulley size which also requires material removal from the supercharger nose (please see our other ads if you prefer the 6% pulley option which gives less boost but requires no modification of the snout casting).
We do offer a fitting service at our premises in Chesterfield, UK to find out more please contact us
Sale Includes:
- High grade stainless steel CNC machined upgraded supercharger pulley.
- Detailed instruction sheet with stage-by-stage photographs.
We have provided hundreds of these pulleys to Trade and Retail customers around the world.
We also offer an ECU remapping service for most makes and models of vehicles.
If your supercharger isn’t sounding it’s best, then look at our supercharger rebuild services.
For a range of upgrades & service parts then please see our online shop or visit our ebay store.
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Range Rover 4.2 2009 pulley supercharger 10% upgrade performance pulley
