Re: Electric Supercharger
Electric superchargers have been out for a long time and in the automotive world they are a joke. Let me explain:
People have no concept of how much power a modern engine produces when compared to a electric motor. The supercharger on the fj will eat 35hp at moderate boost levels. Sure the net result is a power increase, however if the supercharger was driven by a electric motor, you would see a even greater gain in power (all a super charger is at a basic level is a high volume low to medium pressure air compressor). It's long been thought that adding a electric motor to drive a supercharger would be the be all end all solution to gain more power and better efficiency. It's not going to work though, and that's simple math. If it takes a engine 35 hp to turn a supercharger to produce a 100 to 140whp gain, it's going to take a 35hp electric motor to provide the same power. A 35hp electric motor will not fit under the hood and would require 2,000 amps at 12.5 volt worth of power.
Even turbochargers (which are way more efficient then a supercharger) require a tremendous amount of energy (in the form of exhaust gas from a engine that's nothing more then a large air compressor itself). Even if you made some sort of 100% efficient electric drive centrifugal blower, it will never be able to provide enough volume or pressure to make anything but one or two hp and possibly slightly better fuel economy.
A large shop air compressor with a 7hp motor would draw 400 amps at 12.5 volts. And that compressor could not even produce enough volume at 7psi for a 1.8 Honda motor. A leaf blower could provide a larger volume of air, but at full engine throttle it wouldn't even be able to produce .25 psi on that same Honda motor (it would become a restriction). There is not free lunch.
Btw the fjs 265hp engine is equal (at max output) to 197,600 watts of electrical energy. That wattage at 12.5 volts is equal to 15,800 amps draw. The same amp pull as running 34 big winches at once, at 100% max pull.