turboae92 wrote:That's a great article thanks yoshi , two weeks back before this plugs I had same ngk cooper but heat range 8 and we're nasty dark from unburned fuel.i also had detonation so I back down on the timing 3-4 degrees total.So far this the best plugs I've tried and no audible detonation. Hey yoshi I been looking at ur website for a while now and I like alot of things u make , I wondering how close ur turbo manifold gets to the distributor because my ebay one likes toasting my distributor electronic and caps.
Sounds like you are in a pretty good range then. Looks like they might be on the hot side but if the next step colder doesn't work and if you aren't getting detonation it sounds like you may be right about right.
I can take some measurements.
Do you have the heat shield like the AW11 dizzy?