Originally Posted by AndyF
Originally Posted by 6PakBee
Just how big an alternator do you need to run an aftermarket EFI? 90 amps seems serious overkill.


You don't need a big alternator to run EFI but you do need a good alternator. EFI is susceptible to electrical noise so the alternator needs to be a late model design, preferably an OEM alternator. I use factory Denso alternators on my EFI cars. I use the 60 amp Denso unit on both of my cars.


While you're statement may be correct, it's not just about running the EFI. The big alternator comes into play when you have more than EFI that is electric. My Powermaster doesn't affect my Holley EFI, but it damn sure isn't putting out enough amps to keep up with the demand of the electronics and not rob the battery to help.

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