Questionim having a stalling out problem, so you could say. first of all, i have a few things to do it, huge front mount, 16g turbo, greddy bov. anyways, the car will idle fine and drive fine .. until u hit boost, and with the front mount, thats about 3500. when it hits boost its fine until u engage the clutch then it just dies basically. some have said its the bov not being tuned .. your opinion ?
AnswerHello,
This sounds as if the engine is either starving for air or starving for fuel at the point of stall. With a larger turbo and FMIC, you greatly increased the amount of air the engine receives. If the BOV is not venting proper, this can cause significant back-pressure in the intake and cause the engine to starve for air. This can stall the engine by essentially flooding it with fuel. A clogged air filter or malfunctioning mass air sensor can also contribute to this problem.
On the other end, if too much air is entering the engine and the fuel pump cannot keep up, the car's computer will stall the engine to prevent detonation. Detonation can cause severe internal engine damage and the computer purposely stalls the engine to prevent it from hurting itself. It can't hurt to replace the fuel filter, clean the injectors and test the fuel pressure regulator to make sure those are not contributors to this problem.
Many DSM owners who have done the mods you mentioned also included an upgraded fuel pump and added a piggy-back air/fuel ratio computer to monitor this and takes the main ECU out of the mix. Running lean can add a good amount of horsepower, but it can be dangerous if not properly monitored. Most cars are designed to run a little rich and a piggyback computer can help maintain a proper mixture of air and fuel to achieve maximum (and safe) A/F ratio.
Good luck!
