My car is not (yet) very aerodynamic. I have found that tailgaters improve my MPG slightly, so I put up with it
(if the car is the same size, and I can see that things are 'safe' ahead of me).
Something I did in my old car once by chance, and am tempted to set up in my current car, would be a special switch to cut off the fuel to TWO of the four cylinders, while making the AFM run richer than it should.
Then, drive along. Flip the switch, then press the accelerator fully down (WOT) for half a second. The exhaust will fill with very hot, ENRICHED, burnt mixture, from the two working cylinders which are running rich. It will also be filled with pure air from the two cylinders which have no fuel...
Then, when you let go of the accelerator, this mixture will stop flowing in the exhaust, and some of it will be 'stuck' next to hot exhaust valves. There will be a loud bang as the mixture burns from the exhaust valves. The explosion pushes the mixture out of the exhaust as it goes, giving a 6-12 inch flame together with a nice bang from the end of the exhaust
I discovered this when experimenting with 2-cylinder running, on my old car (using an LPG switch to disable two of the fuel injectors). The only proviso, is that you shouldn't do this to cars that have a catalytic convertor!
I had just discovered the 'popping' noise when someone tailgated me, I tried it, and they backed off
Then, later on that day, when it was dark, I tried it out again (with no-one behind me), and I could see huge flashes of light behind the car
If you hide the switch somewhere, and splice into the injector wiring under the dashboard so no-one can see the modification, then even if someone reports you for it, and the police stop you or something, they will just find your car running smoothly, and there will be no sign of how the flames could have happened
I will just go and update my avatar I think to show the effect
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