Ignition advance curves

Joined
Sep 12, 2011
Messages
123
Age
42
Location
Da U.P.
I realize this is territory where a sled burns down QUICK, but having re-written a few timing maps in EFI vehicles and successfully recurving the distributor in my Crown Victoria, it's become an addiction. Is there a graph of the timing map for these sleds? I assume the only way to modify it is to slot the stator and rotate it. Has anyone ever made a pointer and set the timing with a gun? IMO, increasing the CR with the HG mod is a better way to go, but most manufacturers leave A LOT on the table in the midrange and low end (think cars, not sleds, I may be full of crap here). Due the the simplicity of what I assume is an RPM only map though, I bet there's less to be had. Still curious nonetheless.
 
the only way i know to advance timing on your sled is using an offset keyway.

more of a straightline theory, i personally wouldnt recommend it for trail applications. yamaha usually does a god job with the ignitions for general purposes. but, there is some to be gained for specific usage.
 
92, first car, stock motor (4.6) was junk so swapped it. Currently EFI 289/5 speed, pending Explorer 302 swap (GT40P) when I get back from my deployment.

I'm really interested here to see if anyone has the curve on these things, I saw mention of the Viper's aggressive curve so that spiked my inerest in this.
 


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