Thanks for reply.
I've tried platinum plugs for quite a while, mostly working fine. Colder ones seemed not necessary & not suitable for my car. My experiences show the stock heat range still works the best. Since there's water for help in cooling.
I've also tried shortening the gaps. That worked fine in the higher rev range, but suffered a little in startup & low down torque. And I felt, with shortened gaps, the engine ran smoother, kind of iron-out-the-edges effect. However, with that smoothness, seemed not as powerful. A trade-off anyway, I guess.
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Originally Posted by JohnA
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EGTs are measured on the exhaust side (obviouly :lol: ) so the compressor is not directly affected. Just the turbine.....
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What I was saying is - the compressor is driven by turbine, & turbine is driven by EG, higher EGT means higher energy, so the turbine is driven harder, so is the compressor...
Where I live is a sub-tropical zone, ambient temp is rather high, now still 20-ish 'C averagely, & almost 30 'C around noon! It's mid Nov!
And my tiny ancient engine & tiny turbo working at a rather high pressure ratio could not have the same efficiency as yours. Under the current setting - 0.5 before turbo + 0.5 before throttle - I still got once or twice audible knock when sudden boost rise rushing past 20psi at 5th. So I need that much water.