Texx
Super Moderator
Original Article Credit: Monkfish
Fuel cut is exactly what it says on the tin, the fuel supply is cut to the engine. But why does it do this? Read on, young Padawan.
Whilst the engine is running, the ECU is monitoring a variety of things going on in the engine using a plethora of sensors. It monitors things such as air:fuel ratio, rpm, temps, boost pressure and all manner of other things I'll not go into now. Basically, it knows how much fuel it needs and how much it is throwing through the injectors. Fuel cut is basically a fail safe. If you modify an engine (For example, increasing the boost for more power) you'll get to a point, about 0.8 Bar from memory, where the ECU basically says "Hang on, if you run the boost any higher without more fuel, bad shit is going to happen" and it then cuts the fuel to the engine entirely to prevent it running lean and causing detonation. The ECU may also store fault code 34 that indicates it has detected an excessive boost pressure.
What you'll experience when you're driving is a sudden loss of all power (It'll feel like you've driven into a wall), lots of lurching about and the engine management will light up (as well as your underpants if it's the first time :haha
. After some careful driving, the engine management light will go out and all will return to normal. Constantly hitting fuel cut will also damage your engine, so if you do keep cutting, you need to find out why if you don't know and rectify the issue. You can also get fuel cut on a cold night if you're running boost close to the cut level and experiencing boost creep.
To remove the fuel cut, you need a fuel cut defender which basically tricks the engine into thinking all is well and it'll not fuel cut.
Important note: Simply removing the fuel cut without the supporting modifications will cause your engine internals to have an argument with the block and depart. Violently.
Fuel cut is exactly what it says on the tin, the fuel supply is cut to the engine. But why does it do this? Read on, young Padawan.
Whilst the engine is running, the ECU is monitoring a variety of things going on in the engine using a plethora of sensors. It monitors things such as air:fuel ratio, rpm, temps, boost pressure and all manner of other things I'll not go into now. Basically, it knows how much fuel it needs and how much it is throwing through the injectors. Fuel cut is basically a fail safe. If you modify an engine (For example, increasing the boost for more power) you'll get to a point, about 0.8 Bar from memory, where the ECU basically says "Hang on, if you run the boost any higher without more fuel, bad shit is going to happen" and it then cuts the fuel to the engine entirely to prevent it running lean and causing detonation. The ECU may also store fault code 34 that indicates it has detected an excessive boost pressure.
What you'll experience when you're driving is a sudden loss of all power (It'll feel like you've driven into a wall), lots of lurching about and the engine management will light up (as well as your underpants if it's the first time :haha
. After some careful driving, the engine management light will go out and all will return to normal. Constantly hitting fuel cut will also damage your engine, so if you do keep cutting, you need to find out why if you don't know and rectify the issue. You can also get fuel cut on a cold night if you're running boost close to the cut level and experiencing boost creep.To remove the fuel cut, you need a fuel cut defender which basically tricks the engine into thinking all is well and it'll not fuel cut.
Important note: Simply removing the fuel cut without the supporting modifications will cause your engine internals to have an argument with the block and depart. Violently.