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Originally Posted by jly535
I have W5DPOs installed by Squire in my nonintercooled 77 930,no running issues in cold, but then again they were installed befor I bought car so I have nothing to compare to. I would think the 3s were exactly that, homologated plugs for racing environment, so I think it makes sense to go a bit hotter if not tracking. I will try 3s sometime to do a side by side comparison, but I hate to spend money on two sets of plugs. Any other feedback on this??? Jamie
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Non-intercooled? And a 3DLZ? I think if I were you, I'd be looking at this again:
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In identical spark plug types, the difference from one heat range to the next is the ability to remove approximately 70°C to 100°C from the combustion chamber.
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Your intake charge temperature has to be well over 100 degrees hotter than mine (based on Kokeln's chart), and you're running plugs 2 heat ranges hotter to boot.
You wanna borrow a set of used 3's?