Defender Petrol Engine Upgrades
Non-Supercharged V8 Engine Options
We offer normally aspirated power improvements for the 4.0 and 4.6 litre engines, through air filter, exhaust, cylinder head, intake manifold modifications and increased capacity conversion.
1) Air Inlet System. A low restriction itg 'Maxogen' air filter is located within a baffled off area to exclude hot under bonnet air for maximum induction efficiency. On pre 99 models, we re-programme the GEMS ECU to further improve responsiveness and power. 'Thor' models from 99 on are self adapting.
Adds 6 bhp to 4.0L & 10 bhp to 4.6L.
Air inlet system - Pre 99 'GEMS' V8 engines-
£425 Kit
£495 Fitted & Tested
Air inlet system - Post 98 'Thor' V8 engines-
£225 Kit
£295 Fitted & Tested
2) Air Inlet & Exhaust System Package. Package (1) above together with a JE Stainless Steel sports exhaust, will lift performance by around 10 bhp for 4.0L & 14 bhp for 4.6L.
Air Inlet/exhaust system - Pre 99 'GEMS' V8 engines-
£1,045 Kit
£1,295 Fitted & Tested
Air Inlet/exhaust system - Post 98 'Thor' V8 engines-
£945 Kit
£1,095 Fitted & Tested
3) 'SPORTS' Cylinder Heads & Manifolds. Comprises Gas Flowed heads with balanced combustion chambers, fitted with large JE inlet & exhaust valves, & 'high flow' shaped seats, together with gas flowed inlet manifold & larger air horns (includes all gaskets). Delivers a gain of around 14 bhp for 4.0L & 18 bhp for 4.6L.
Sports 'top end'-
£1,645 Kit
£2,395 Fitted & Tested
4) 'SPORTS' Performance Package. A complete gas-flow power upgrade comprising:
• 'SPORTS' Cylinder Heads & Manifolds Package (as (3) above)
• Induction & Exhaust System Package (as (1) & (2) above)
Will lift power output by 26 bhp for 4.0L & 32 bhp for 4.6L, delivering a lively response. £3,595 Fitted & Tested
5) JE 'SUPERSPORTS' 5.0 Litre ' Short engine ' conversion comprising:
• Fully floating forged pistons fitted to steel 'H' section Steel con-rods
• Specially machined 'Tuftrided' Long stroke crank
• All parts lightened, balanced & blueprinted to competition tolerances
• Reprogrammed engine ECU
This conversion delivers a power output of 240 bhp & 425 Nm torque- £5,950 Fitted and Tested
6) JE 'SUPERSPORTS' 5.0 Litre ' complete engine ' conversion comprising:
• 5.0L short engine (as (5) above)
• Sports cylinder heads & manifold (as 3 above)
• Reprogrammed engine ECU
This conversion delivers a power output of 275 bhp & 440 Nm torque- Fitted and Tested £7,100
Performance Air Filter
Performance air filters from our sister company, itg, manufacturers of the worlds leading foam air filter and suppliers to the current F1 World Manufacturers Champions. Maxogen and pro-filter types can be fitted to any Range Rover.
Pro-filter - Standard filter replacement £34
Maxogen - Barrel type from £40 to £62
See Engines page for comprehensive details of petrol engine upgrades.
Prices do not include VAT which UK customers must add at the current rate.