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High coolant temperatures = more spark knock?
I have noticed on my ZX2 that as my coolant temperatures increase steadily that the amount of spark knock increases as well. The car is fine up too 200*, then it goes down hill from there. For example, I hit too many red lights in town today and my ECTs started climbing. I was having spark knock at any load over just 60%! Has anyone else experienced this problem? What could possibly alleviate it?
I know some options are:
- Less grill block; don't want the worsening aero though.
- Avoid driving at all
- Higher octane fuel
I should mention that I have the ignition timing advanced and run with the knock sensor removed. Before anybody freaks out, this is standard protocol with the ZX2. It was recommended by Ford themselves. Another interesting point is Gassaver's member COZX2 reported that the most efficient temperatures for our engines was in the range of 210-225*, which coincides with my worsening knock.
The knock has gotten worse on this tank due to a switch to see how 87 octane would work with the new computer. I usually run 89 octane, and it is not this bad.
It is bad enough that I want to pump my gas out, sell it at a discounted price to someone and buy 89/93 octance lol!
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