Hi everyone,

Just wondering if anyone can shed some light as to how the fuel cutoff works in our cars; in particular in automagic cars as we have the rev limiter cut and the fuel cut when TCS is turned on... I'm the most worried about running boost and then seeing the fuel cut; shouldn't that be potentially dangerous for the well-being of anyone's engine when running boost?

 

Don't know HOW it works but I know it does... it may be spark cutoff...

Ran into it many times after putting in my S/C

 

I presume you are worried about detonation arising from a leaned out AFR? If the fuel is cut, then yes, it is lean, but it is so lean that there's no ignition at all, much less detonation.

 

Hmm true... thanks for making me feel better

 

Don't sweat it, I've hit the rev limiter dozens of times. it just happens a lot when you're auto, the tranny just can't keep up.

 

I'm guessing that's the same thing as going full-throttle and fuel cut happens because your actually really low on gas? Isn't this bad?

 

The problem there is that the fuel may not be fully and immediately cut off, but rather a gradual drop or intermittent flow may occur as the fuel sloshes around in the tank near the pickup tube. That situation could very well result in a lean mixture that produces detonation. The fuel cutoff won't because one minute you have full fuel flow and the next you have nothing. As the rpm drops the full flow will kick back in (if you're not paying attention and haven't let off the gas pedal).

 

Running that low is also detrimental to your fuel pump.

 

Oh yeah, yer right about that.

 

Fuel injectors too?