Jeep 4.0L Wrangler
Performance Conversions | Big Valve Cylinder Heads | Unichip Power Tuning

The 4.0L Jeep Wrangler models, that share a engine with a few other Jeep's has been under the development light at SAC.

These vehicles have been popular for conversions over the past few years within the SAC group but given the extremely long gearing the power increase simply wasn't enough.

Extensive testing has been completed around the Jeep Wrangler Air Intake System and the Throttle body.

We found the vehicle to be very starved of air and made some changes.

A throttle body enlargement from a reducing standard 60mm went to 63mm through out, this made a huge improvement however a further 10mm in diameter was what it wanted.

A prototype 73mm throttle body was fitted with a enlarged Inlet duct from the Air Filter to the Throttle.

All this was added to the bigger inlet valves fitted to the cylinder heads and the increased compression ratio and we were happy with the power output.

The complete conversion adds ± 33kW to the already impressive 130kW.

The Wrangler in both Manual and Automatic form needs as much power as is available to suit the gearing 100% not to mention to reduce the very excessive fuel consumption.

We have already seen fuel savings off up to 20% and more depending on driving style.

All this and the vehicle is still reliable and smooth as it should be for a 4X4 hero.