Qusetion by: Nico Swart Answer by: Arnold VenterI drive a Triton 2.5. I’ve read many arguments for and against blocking off the exhaust bypass valve that re-circulates gases through the combustion chamber to produce cleaner emissions.
By doing this I hope to gain better throttle response and a little more torque between 1 000 and 2 000 rpm, as the Triton struggles in this range. Will this work and would you recommend it? Secondly, and to accomplish the same goal, I’ve heard that one may also explore the possibility of fitting a full free-flow 63 mm exhaust system which would apparently get rid of the hot gases more quickly and reduce back pressure. Will this help to achieve the desired result and would you recommend it?
THE EXPERT’S OPINION:
The function of EGR (Exhaust Gas Recirculation) is commonly misunderstood. This is controlled via a valve fitted to the intake manifold and connected to the exhaust manifold and controlled by the ECU and a sensor in the water system. If the engine cooling system is running below 50° C the valve is opened via vacuum to allow hot air to be sucked into the intake manifold from the exhaust in order to heat up the combustion chambers so that the cold start is easier. This is most effective at sub-zero temperatures which are not common in our country. It’s very inactive in our conditions so the best is to just leave it in place.
We fit a larger exhaust system when we do our conversions on these engines, which allows less backpressure on the turbo resulting in quicker spool-up speeds which results in a performance gain. We also fit a chip to the ECU. We gain up to 142 kW and 425 Nm on these 2.5 engines with very little turbo lag.
Arnold Venter, CRD (4×4 fitment & repairs)
(011) 907 0580 / firstname.lastname@example.org