I own a ’97 EXT 580 EFI and was wondering if you can give me some tips on what I can do to modify my sled to get more power. Is it worth playing around with the EFI or should I just buy a bigger sled?
Your best option would be to simply install an aftermarket EFI chip that has a more aggressive fuel map to make more power (about 5 hp). Arctic Cat performance shops like Black Magic and D&D Cycles offer such chips. However, you’ll have to watch your fuel supply as some the “margin of safety” is used up in creating the extra power. Some master tuners have experimented with using an adjustable pressure regulator for the EFI fuel rail. The theory is that minor differences in the fuel pressure regulators allow some room for performance gains. By monitoring the exhaust gas temperature you can reduce the pressure in the fuel rail to lean the mixture and make more power. This is more of a development tool for those who make the chips and is not for the casual tuner, but I thought you’d find it interesting.