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XJ V8 1997-2003 >Upgrades < back

Supercharger pulley upgrade
Part No RGK104
Designed to boost supercharger speed and hence performance.The upgrade involves installing a larger supercharger drive pulley mounted on a modified crankshaft pulley; the conversion includes replacement of the idler jockey pulley and supercharger drive belt. When a Racing Green Cars exhaust upgrade and performance air filter are fitted, the power output is increased to 450 bhp from 400 bhp (XKR 4.2) and to 430 bhp from 370 bhp (XKR and XJR 4.0). Reprogramming the engine ECU takes this power increase to 470 bhp and 450 bhp respectively. Increasing the size of the crankshaft pulley is significantly better than reducing the size of the supercharger drive pulley in terms of performance gains. The latter option will spin the supercharger faster but can cause belt slippage at speed. It is recommended that Racing Green Cars fits this kit due to the complexity of the installation.


£510.00 (including VAT)
£425.00 (Excluding VAT)


Related Parts:
ECU upgrade
Part No - RG 025
Engine management upgrade incorporated into standard ECU by computer download		 Click here for details
Air filter - performance
Part No - F 310185
Jetex sports induction air filter designed to reduce the air flow restriction of the standard element and so increase the breathing efficiency of the engine		 Air filter XK Performance
Water Injection Kit
Part No - 806-002
Cools induction charge and provides approximately 10 bhp more power when underbonnet temperature rises		 Water injection kit
Air filter K & N
Part No - 33-2190
K & N sports induction air filter designed to reduce the air flow restriction of the standard element and so increase the breathing efficiency of the engine		 Click here for details

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