From all the data I've seen from the Zilla (like graphs from Plasmaboys homepage etc) I can tell you that:Boy this is a touchy subject. But, I am very interested in what the difference is in the 1/4 mile, 2000amps of a "short burst" then dropping below 750amps, or 1000amps continuous.
- A well cooled Zilla Z2K will give you enough Amps long enough (definitely for 1/4 mile) to beat a S1, all other things equal. The S1 MIGHT win in the long run (Cafe Electrics own specs says that a Z2K drops to 900 Amps continuously, but I have no first hand data on that so I haven't been able to verify), but not on the drag racing strip. That's Z2K-territory for now.
- Your biggest limit (besides the motor current limit) that will affect the slip time will be the battery pack. If you have a crappy pack the 2kA will drop rapidly to much more mediocre currents as RPM (and thus motor voltage) increases so it's definitely possible that if you're on a budget a S1 with a good pack will be a better pick than a Z2K with a crappy pack. After all, a chain isn't stronger than it's weakest link. However, if money's not a problem Z2K is your winner, no doubt about that.
- You better hurry buying a Z2K if you want one. I doubt Otmar has many left now...