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I’ve been tuning my Evo 8 MR on Maxxecu and I’m amazed at low low the timing numbers need to be on these engines! I am approx 7 degrees at 1.0 bar @ 5000rpm and as low as 2 by the time we’re upto 1.5 bar. At first I thought I had my base timing incorrectly set but this has been checked & verified several times, even at sub 10 psi (G25-550 turbo) at moderate rpm I can run into knock very easily.
I’ve learned that this is normal for a late Evo but wondered why! Is it because of the bore to stroke ratio?
Engine is 8.5:1 cr
272 cams on stock head ports etc
Uk pump fuel - shell 99 octane
Smallish turbo
Very low charge temps - IC fairly big
3 inch exhaust
NGK 7 grade plugs now onto 8’s
