Range Rover P38a Petrol Engine Upgrades

While this page is entitled "Upgrades" which rightly refers to performance, it is equally applicable to the care and attention with which the engines are built. When comparing prices with other suppliers it should be borne in mind that ALL JE engines are built to at least Club Motorsport standards. They are NOT a collection of bog-standard bits thrown together for profit expediency. In addition to the usual "rebore and bearings" as recommended by 'experts'(!) ALL JE engines are based on a thoroughly cleaned and de-burred block, new core (freeze) plugs and bungs, improved oilways and oil returns; all rotating parts fully balanced, all combustion volumes balanced, recut and shaped valve seats, inlet/exhaust tracts smoothed and de-burred AS AN ABSOLUTE MINIMUM. All this and more on a standard rebuilt engine.Thus, it is usually more cost effective to fit a JE rebuilt engine rather than attempt repairs to individual sub-assemblies which will inevitably result in further repairs sooner rather than later.

Conversions for the V8 Range Rover.
All of our products are tested and proven to Manufacturer's standards for durability at our in-house engine test cell facility.

Supercharged Rover V8 Options

JE have unique experience in the supercharging of the Rover V8 engine. Please enquire for details of these extreme power units.

Non-Supercharged RoverV8 Engine Options
JE 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.

As 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- £6195.00 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 £7450.00

Performance Air Filter
Performance air filters from our sister company, itg, manufacturers of the worlds leading foam air filter and suppliers to the 2006/2007 F1 World Drivers and Manufacturers Champions. Maxogen and pro-filter types can be fitted to any Range Rover.

Pro-filter - Standard filter replacement £41
Maxogen - Barrel type from £48 to £62

Prices do not include VAT which UK customers must add at the current rate.