The engines 37 psi of boost is provided by a Precision Turbo Gen 2 PT7275 turbo. The turbo features a 72mm, 2618 forged billet compressor wheel, CNC machined to final shape. The forged billet wheel is stronger which enables the use of thinner blades and a slimmer hub profile for better aero and flow. The compressor wheel features an extended tip inducer which makes for faster spool from lower shaft speeds. The wheels aero is CFD optimized for good efficiency. The wheel sits in a 4″ inlet 3″ outlet ported housing which reduces surge sensitivity.
The 75mm turbine sits in a free-flowing .96 A/R turbine housing and the whole thing spins on low friction for fast spool dual ceramic ball bearings, center section. Unlike some turbos, the PT7275 has an air-cooled center section so you do not need to run water to it. This is great for a competition car where you are always trying to simplify things in the engine compartment. The turbo’s maximum power rating is 1015 hp and it is designed to be exceptionally fast spooling with good transient response for its power rating.
The Precision Turbo sits on a Nameless Performance fabricated manifold which is set up for anti-lag. A custom KMR 4″ stainless exhaust pipe gets rid of the exhaust exiting the turbine. Anti-lag is critical in keeping the tiny 2-liter rotary with the big turbo on the boil at all times to give the kind of response needed for drifting a big sticky tired pro car sideways with good control.
Primary boost control is handled by the two smaller Precision PW46mm wastegates. As a very interesting feature, a huge Precision PW66 wastegate activated by the ECU is used to help control exhaust backpressure. Having anti-lag with a big turbo means that under certain modes of operation, you need a lot of wastegate valve and exhaust area with a rotary to control boost and backpressure. Having the back pressure relief valve also means that you don’t need to try to fit a huge exhaust in the cramped underbody of the car.
Kyle’s engine is known to blow huge flames out of the wastegate discharge pipes which the fans love.
Kyle is using Precision Wastegate as part of the anti-lag system. It takes pressurized air from a charge pipe and feeds it to the exhaust pre-turbine. The ECU can add fuel while retarding spark while the throttle is closed allowing the fuel to burn in the exhaust manifold making heat to keep the turbo spinning while the throttle is closed.
A big Turbonetics Godzilla blow-off valve is also used to control surge when the throttle is closed. The delicate balance of wastegates and blow off valves are all ECU controlled to help keep the turbo on the boil so the small but powerful engine can stay on boost.