[POMPSKI]

Note these changes are over the 2.5 V6 180 models used in the Rover 75 and MG ZT 180.

Beginning with the induction system, the air cleaner has an 80mm diameter intake duct in place of a 70mm duct, and a new intake diffuser. This provides a smoother airflow with less than half the usual pressure drop; it has also been tuned for a more sporting induction sound. Internal engine changes include a new inlet cam profile, advancing the inlet valve opening and improved porting.

A further contribution to the performance boost comes from exhaust system, with 60mm diameter pipework in place of 57mm, new low-restriction metal-based starter and main catalysts and a modified rear silencer unit. This silencer has larger-bore internal pipes, twin straight tail pipes and a mechanical valve, which responds to exhaust pressure at around 4500rpm to by-pass the internal baffles.

The 190 engines have specially designed MG throttle cams and engine ECU software to provide the right sports car feeling of responsiveness to the accelerator pedal, with a deliberate reduction of the normal throttle on/off damping. Also common to both ZT-T engines is an enhanced cooling system, with 20% greater cooling intake area, improved-flow radiator and top hose configurations and a new plate-type oil/water oil cooler replacing the oil/air heat exchanger.

http://www.the75andztclub.co.uk/foru...t=75282&page=2