Sorry, just deleted my post to rephrase myself since I thought my language was clunky. Let me restate myself for posterity and anyone else who wanders by.
I think giving the vortex generator the same power as the best alternator is just about right. For all intents and purposes, vehicles have a total of two engine slots. That means that if you’re using conventional engines, you can install two gasoline engines and two alternators.
But with the vortex items, you can only have one of each. This is because the vortex generator takes up one of your precious engine slots, while an alternator does not.
This means that a conventional dual-engine gasoline setup will vastly outperform any possible vortex setup, even if everything else is equal. Suddenly that thing where the generator eats up an engine slot isn’t a nuisance, it’s a balancing feature.