Mitsubishi Lancer Evolution - Tech Knowledge

Cam Timing And Piston-To-Valve Clearance
When selecting camshafts, we wanted a design that would offer a substantial power increase in the mid-range to upper rpm level, while maintaining good idle quality and low-speed drivability. Kelford's popular 272-degree duration camshafts fit our needs nicely, and the exhaust cam was coupled to a BDL adjustable cam gear sprocket. The camshafts are available off-the-shelf and have a good reputation for use in daily drivers.

AMS F1i Intake Manifold
After spending so much time perfecting the cylinder head, we knew the stock intake manifold wouldn't make the cut. We found the ideal solution in the AMS Performance F1i. AMS spent two years designing the new cast aluminum intake manifold with claims it will provide up to five percent more power than their popular VSR manifold. The extra engineering effort showed, as the F1i has many features pulled straight from the racing world. The manifold plenum contains large internal velocity stacks and tapered runners that keep air moving quickly and easily into the cylinder head, along with a larger throttle body opening that allows more air into the plenum, and can be fed by a stock Mitsubishi or 4.6L Mustang throttle body. Several accessories such as a custom dipstick tube, vacuum fittings and a stainless steel support bracket are also included.

Throttle Body
Our OEM Mitsubishi throttle body lacked the flow capacity we needed and was replaced with a factory version modified by Milspec. The factory throttle body bore was opened up from 60 to 65mm to allow airflow to match the opening of the AMS F1i intake manifold, and MILSPEC also replaced the throttle body shaft seals with upgraded versions that eliminate boost leak. The entire assembly is a direct replacement and operates like the original equipment.