A lot of people call and ask, "What's the difference between the XP, SPX and SPX-i?" Well, here is a great visual explanation I put together for you for the stator differences.
DIFFERENCE BETWEEN THE SPX, XP, AND SPX-I ALTERNATORS
The SPX on top is a 3 Phase unit which makes it less efficient at producing power along with it having a higher AC ripple current (engine noise) due to it only being a 3 phase unit. (This is why the SPX is cheaper than the XP even though it produces more output than the XP). Due to it being a non-hairpin stator it loses up to 30% of its peak performance when it's introduced into extreme heat.
The SPX-i on the bottom is a 6 phase stator. This alternator produces a little more noise than the XP, but significantly less noise than the SPX due to it's 6 phase design. This alternator produces higher output than the XP. However, being a non-hairpin stator it loses up to 30% of its peak performance when it's introduced into extreme heat.
I hope this gives everyone a general idea of the differences in the alternators. If you have any more questions, feel free to give us a call at 888-334-2632
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