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I was wondering what is the best spark plug to get for a supercharged car at 10psi. The ones I have now are crap to the 10th power. They are bosch 4 ground straps and I am loosing so much power from them not being able to handle that boost, because the are for one Bosch and 2 you can't gap them. So I was wondering if anyone has had any expierence with different plugs and gains they have seen from them. Any input would be great.
+1 on the Autolite. No you don't gap them. Also, they need to be a degree cooler than your stock plugs. (for a KB s/c setup at least) I just changed mine after 13000 miles and they were fine, except for the issue of corrosion around the threads that is inherent to the s197. I'll keep changing them every 12000 or so miles to avoid having them sieze up.