In the Mazda RX8 2004 Service Highlights manual I bought at
7 Stock on  Page 01-40-53 is this diagram and timing of the 
E-shaft position sensor. Great for all Mazda rotary engines.
The reason it triggers 5 degree before top dead center is Mazda
sets the timing to that number when the car is cold for emissions reasons.

This manual is well worth the money. Part number 3378-1U-03C

BTW don't try to use an RX8 alternator. The output voltage is
controlled my the main engine computer. You would have to design your
own voltage regulator and attach it to this alternator to use it. 

Paul Lamar
 
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