Systems and methods for a split exhaust engine system

A system for an engine, comprising:

• a plurality of cylinders, each cylinder including a first exhaust valve and a second exhaust valve;
• a blowdown exhaust manifold coupled to the first exhaust valve of each cylinder, the blowdown exhaust manifold coupled to an exhaust passage, upstream of a turbocharger turbine;
• a first scavenge exhaust manifold coupled to the second exhaust valve of each cylinder via an exhaust runner, the first scavenge exhaust manifold coupled to the exhaust passage, downstream of the turbocharger turbine and upstream of a catalyst;
• a second scavenge exhaust manifold coupled to the second exhaust valve of each cylinder via a port coupled to the exhaust runner, the second scavenge exhaust manifold coupled to an intake passage, upstream of a turbocharger compressor;
• a bypass passage coupling the first scavenge exhaust manifold to the exhaust passage, downstream of the turbocharger turbine and upstream of the catalyst, the bypass passage including a bypass valve disposed therein;
• an exhaust gas recirculation (EGR) passage coupling the second scavenge exhaust manifold to the intake passage, upstream of the turbocharger compressor, the EGR passage including an EGR valve disposed therein;
• and
• a controller with computer readable instructions stored on memory for:
• operating the first exhaust valve of each cylinder at a different timing than the second exhaust valve of each cylinder;
• and
• opening the bypass valve and maintaining the EGR valve open in response to the turbocharger compressor reaching an operational threshold.