Originally Posted by n2xlr8n
BTW, if the engine is 9:1 (and I'd believe Quirt), you're not only igniting a more efficient charge, it will run leaner than the same map on a 8:1 engine, and consequently make more noise.And power.
What is the PN on your coilpacks?
You're on the same page as me here in regards to compression, power and noise. As you make more power noise tends to increase, this is why a simple "free rev" to establish a knock threshold map isn't sufficient but it does help establish the base noise level of a particular engine.
Also keep in mind higher compression generally leads to higher in cylinder temps. I'm not implying the colder plugs are incorrect so let's here more opinions.