Hi there i have a nissan silvia sr20det and i just put in a boost controller and turned the boost up to 14 psi and when you put your foot down and the boost kicks in it loses power and coughs and splutters would this have any thing to do with the big hole in the centre muffler? cheers

My 1987 pulsar with a CA16DE DOHC looses fuel pressure when it sets over night. I have replaced the fuel pump and the external return valve on the tank. the injector seals at the intake are in good condition. The injectors are the ones with the hose that is crimped at both end. Any idea why it loosed pressure and seems like it is out of gas at first start up. It starts good after that.

Most turbo cars have an overpressure switch which cuts the fuel pump or ignition. This is to protect the engine in case the wastegate fails and there's nothing to limit boost. Some are a stand alone, adjustable unit while some are built into the ECU. (If there's a pipe connected to the ECU it will be for manifold pressure/vacuum) I don't know where yours will be so you'll need a decent manual or try tracing pipes to see where they go. I'd recommend the former.

The hole in the muffler cant hep. how does it run without the boost controller?