same as EOC in autos...the engine'll stop, the trans will stop pumping and die. the other problem with that idea is that there already is one...it's called the ignition switch.
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
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It can sort of work at engine speeds above around 2000rpm, because the tranny will still be driving the engine, below that it won't. So if you can rig it in a set/reset kind of fashion where it kicks the fuel back on if the engine revs drop too far, then it might work. It works like that in some manufacturers ECU programming. I've heard that some Saturn autos have rear pumps meaning that they might be able to cope with lower rev holds and still pick up again.
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
There's lots of ways to install a switch to prevent the car from starting. You could find an existing anti-theft wire coming from the steering shaft and interrupt it with a switch. You could interrupt the fuel pump fuse or relay. Or, as you've done before, you could find the starter wiring...
Some newer auto cars have this built in to their computers. When you are slowing they stop feeding it gas and let the wheels turn the engine until it is in danger of staling. I think my 99 subaru (auto) dose this. I only know this because I attached some wires to my O2 sensor so I can see the readout on the Fluk DMM in my cup holder. The signal jump way out of normal range when I'm coasting to a stop (in gear) or down shift to slow down.
I want to set up a switch to do this as well. I can predict when it should go on better than my computer.
The thing that makes this complicated is that the computer will think something is serously rong when you flip the switch. The way around this that I see is to make a voltage supply for all your sensors that will tell your computer that everything is working as normal. This supply would need to be hooked up to the same dash switch.
This seems like a good idea, as you get better mileage using no fuel then idling in N. (though you don't role as far w/engine braking effect)
are you talking about DFCO deceleration fuel cut off?
all newer cars do this and I think it goes way back as to when it is done. If I had to guess, I would say that your car already does it.
on my wife's car, it shows about a 1 second lag time from when she takes her foot off of the gas to when she goes into DFCO. I don't think you can do better than this though if you could, I don't think it would be worth the effort
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well there is one way to find out....
Maybe there are other ways..
I've got to go get some cat food. About a 5 min drive (each way) with lots of lights. I'm going to see when my car dose this based on O2 readouts, and with a stop watch see how much more time it could be off if I were controlling it. This would be a safer test with an assistant... oh well...
this will not be the most accurate test, and will very greatly from car to car, but it may give some idea if this is a complete waist of time...
I'll report back in 20 min or so.