Steve's Auto Clinic has released an aftermarket upgrade for Nissan's 4.0 litre V6 powerplant used in the Navara that boosts power by up to 20 kW.
The conversion is available through franchise stores nationwide, and costs R7 900. SAC claims a power hike of up to 20 kW from this unit, and also improved fuel consumption in normal driving.
The conversion comprises a stainless steel SAC designed free-flow exhaust system mated with tubular manifolds from SAC partner, Wildcat that the company claims will improve the exhaust gas-flow characteristics without significantly changing the noise level or tone while cruising.
A minor change is also made to the airbox which houses the air filter. A turned aluminium venturi is fitted into the front face of the airbox, which has the effect of ramming cooler air into the engine as the road speed increases.
A Unichip piggy-back computer module has been fitted, with a pre-programmed "map" of optimised ignition and fuel parameters for revised inlet and exhaust valve timing. This apparently allows the engine to achieve its peak efficiency across the entire engine speed range.
Maximum usable r/min is unchanged at 6 300, while true top speed, as tested independently at Gauteng altitudes, remains at 191 km/h. The limiter can also be removed at the customer's insistence.
Just over a second is lopped off the 60 ? 100 km/h time in fourth gear, while the modded car is a full 1.7 seconds quicker between 80 and 120 km/h in fifth gear.
According to before and after results provided by testers, Roadworx, the Navara will sprint to 100 km/h in a fraction under nine seconds, and cover the standing kilometre in 29.76 seconds at a terminal speed of 178.1 km/h.
Since this is a bolt-on kit, no internal changes are made to the engine and the conversion can be applied to all V6 Navaras, whether two- or four-wheel drive or with automatic or manual transmission.