Boost it set at 18.5 psi and I keep getting knock and a hesitation at high rpm's. AFR's are low 11s with 93 fuel. I started with the top map below before upping the boost and had no knock. Now with the higher boost I have the knock. I changed the spark to what you see in the lower map and still have knock. Anyone have any ideas besides lowering boost?
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18.5 psi is what 220kpa? the timing's barely/not changed at that level...

Try a more drastic cull of timing, it's easier to control a fire than put it out

 

16* is around what most us stockers run at 12-14psi, just fwiw.

 

So I should pull even more spark?
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pull until u stop knocking to see where ur at. Do you have knocksensems?

 

19psi on pump gas might just be too much.

 

Time for WI =)

 

That's what I was afraid of because even with a spark map close to DIY's base map I was getting knock.

I guess I'll just have to settle for 16 psi.
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or run race gas or WI.

 

Bad gas maybe? You are on the east coast so it should be a problem.

If you are getting knock on the DIY map then it might be something worse. Are you sure your mechanical timing is correct?

The DIY map is so damn conservative, I have no idea how you can develop knock on it.

 

try a gallon of toulene when you get to about half a tank. stuff works awesome on my MSM

 

I really doubt that will work, we're talking 18-19 psi here.
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