What is the max safe boost on a stock Evo?
Max safe boost on a stock Evo is roughly 20-21psi held to redline. This may taper to ~19psi in the upper rpm range. It is best to purchase some form of engine management in order to tune your Evo for increased boost. Generally, if you want to boost beyond those numbers you should upgrade your head studs and rod bolts. Top What is the stock boost on the Evo? The Evo peaks at ~19psi and tapers to ~16psi by redline. Top I’ve increased my boost to ~24/25psi. At full throttle my Evo jerks really hard like it hit a wall. What is that? It sounds like you’ve hit the factory fuel cut. In order to get around this, you’ll need to move to stand alone engine management or a reflash to increase the fuel cut settings. It is possible to reflash the ECU and also run a piggy back controller to fine tune. Top What is boost? Boost is the amount of pressure, above atmospheric pressure (1 bar or ~14psi), that is being fed into the engine. In order to achieve boost you will need some form of forced induction
