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Message
It could be that with faster combustion
wave propagation that you would want the timing of the lead and trail closer in
timing rather than further or possibly vice versa {:>).
.
Ed Anderson
Exactly
right Ed, or vice versa :-)
Through the
miracle of copy and paste, I'll attach the timing split from my old FD engine
computer. Keep in mind that this is NOT the stock Mazda timing, though
it's probably close to it. The top row is the scale in RPM, and the first
column is the scale in inches of mercury. The numbers in the box represent the difference in degrees between
when the leading, and trailing ignition will fire. Positive numbers
indicate that the leading fires before the trailing.
It's
interesting to note that aside from the idle range, the timing split is 0 until
you get to around sea level pressure. From there, it quickly increases to
about a maximum level for the rest of the boost range. From this, I would
assume that increasing the split reduces the chance of
detonation.
Still hard to
say how important this is for us. How much greater is the chance of
detonation? How much power would you lose if you had to run on
trailing ignition only with the split built
in?
Cheers,
Rusty (doing
my turbo duties, though I'm not sure
why)
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