[sjf911]

Originally Posted by 911st

Richard,

Excellent info in post 37! Thank you.

Great points.

Apx -20 on boost. One dyno -18 to -23 seems range.

Maybe one more deg for 1 bar.

Apx -2 deg more advance with twin plugs.

Heat in the cylinder from ideal AFR helps ignition.


Can I beg you for:

Recommendations as to timing for a more stock 930 from idle to 3000rpm 'if there were no boost'?

About how much more power are you seeing with twin plugs? I had heard about 3% on a NA motor from just the earlyer advance it runs.

The best.

I think you meant to say about 2 degrees less timing advance with twin plug ignition.

I am also curious what about the influence of RPM on twin plug timing variance from single plug. Is this plus or minus?