Jaguar Supercharger Pulley Upgrade: XJR 4.0 V8

7% upgraded smaller supercharger pulley. This Jaguar supercharger pulley upgrade gives your supercharger 7% speed increase.  Supercharger pulleys are one of the most proven performance enhancement available for Jaguar supercharged engines.

In addition to its high quality stainless steel construction, the pulley is manufactured to the tightest surface finish and dimensional tolerances available.

When the pulley ratio is changed, the supercharger operates at a higher speed and produces 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:

It gives you a 7% boost pressure increase, which is equivalent to a 2.5 psi increase in supercharger driven speed.

It is estimated that this size of pulley modification will result in about a 35-40bhp/ft lb gain

Installation of the Jaguar Supercharger Pulley Upgrade XJR 4.0 XJR V8 4.0 / 4.2

Your new pulley will come with fitting instructions, and Paramount also offer a fitting service. Please be aware on the 7% pulleys, the nose cone / snout of the supercharger will need to be cleaned up and a small amount of material removed to allow clearance. Alternatively, a 6% pulley is available too.

We do offer a fitting service at our premises in Bidford On Avon UK to find out more please contact us

Jaguar XJR 4.0 XJR supercharger pulley