Help with base timing on 9:1 turbo motor
#1
Help with base timing on 9:1 turbo motor
Hey guys, I recently re(built) my motor after turning my stock rods in to bananas. I bored it over .040, put Supertech 84mm 9:1 compression pistons, and Manley rods. I'm very aware of the fact that lower compression means that you can get away with more timing. But I've had trouble finding a general idea of what my ignition table should look like with the new compression ratio. I am running Lars's MKTurbo churbo still. EBC is set up for 212 kpa or 16psi currently. Anyways, I wanted to get some more educated and knowledgable opinions on my current map. In my opinion it is pretty conservative accross the board, but then again there are some posts that would contradict that.
Thanks,
Blayton
Thanks,
Blayton
#3
Fuel is pretty dialed. 14.7 cruise, tapering to 11.5 in boost, low 15s highway cells. My main concern was if I could get away with any more timing safely. This map is almost exactly the same map I used with the factory 10.5:1 pistons, with an exception on a couple degrees up top. I would have it Dyno tuned by a professional, but idk how long I'm keeping this little baby turbo.
#8
The best way is to set a baseline of noise which should increase as rpms increase with a known safe tune. Then set your threshold slightly above that. I'm experimenting with a knock limit 5 to 10% above baseline. Mine starts out at 5% and goes up to 15-20% at redline with a safe tune. Just have to get on a Dyno and get my Det cans working to verify when knock really does happen.
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