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Jeep 4.0L Wrangler - Gas flowed big valve Cylinder Head Conversions, Modifications & Upgrades
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Jeep 4.0L Wrangler
Performance Conversions | Big Valve Cylinder Heads | Unichip Power Tuning

Power Enhancement Conversions

JEEP 4.0 L WRANGLER FULL HOUSE CONVERSION
A Jeep disguised by Power
By Mark Jones of Performance Motor Media.
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.
Now the vehicle manages the long gearing with more ease.
Further development is underway to change the Rocher Ratios to enable the large intake and exhaust valves to open even further – watch this space.
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.
 
FULL HOUSE JEEP WRANGLER CONVERSIONS
· Big Valve Special Cylinder head flow, redesigned for 9.3-1 compression ratio.
· Wildcat branch
· 63mm catalytic converter, stainless steel free flow exhaust system
· A Oxygen sensor simulator
· Sportflo Pannel Air Filter
· Air Box Venturie
· Enlarged Throttle Body – 63mm.
· Unichip – Electronic control unit upgrade
 
"JEEPERS" - A Wrangler that goes!
 
 
 
 
 
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* All Test Figures displayed on this website were obtained at Highveld altitude. These figures may differ from vehicle to vehicle.
The power figures have been corrected back to flywheel power.
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* All manufacturer's names, numbers, symbols & descriptions are for reference purposes only.
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