[Azimov]

Let me explain about my fiddling with capacitors. My experience comes from using them as storage in solar applications. I've hooked motors to solar circuits using caps ranging from 1000uF all the way up to 10F, which is the largest storage I could find on the net. I usually use between 3-6VDC with these solar circuits.
I've had a couple of mishaps with screwdrivers or x-acto blades crossing the leads on a charged cap and have gotten some good sparks, but never the slightest poke of electricity. At these voltage lvls, you can touch the leads with your fingers with no ill effect or even discharge of the cap.
Things get a little scary when the voltage is very high even if the current is very low. Thats why the caps in disposable cameras will bite you good. They discharge if you touch them bare handed. They're rated around 10-30,000VDC At something like 1000uF. Same with electric fences and tazer guns. Stupid high voltage, low current. This will kill you.
What we are dealing with is the opposite. Low voltage so so high current. Fairly safe.
Now let me explain why I would go upwards to the 1F range for a turbo boost. I've hooked many a motor to those caps and solar cuircuits so the cap dumps through a trigger and spins the motor. Caps in the 4700uF range will maybe spin the motor shaft 3-4 times. Thats ungeared, straight from the shaft. No real boost at all. When you get up to 1F or so, the motor will spin like a dervish for 10-15 seconds depending on the efficiency of the motor. With these cars motors, I'd say you would be lucky to get a 3-5 second boost.
I know you weren't saying 4700uF was the way to go Jazz, I've seen those posts as well and wasn't implying that you were mistaken. It's just that I know I have to hook at least three of those 4700uF caps in parallel in order to get several revolutions out of highly efficient motors.
Sorry for the long post, but I felt the need to clarify why I have little concern for the use of high current caps in this application.