Anyone have any recommendations for some knock I'm getting in 4th gear? I was at the track last Friday and all four 1/4 mile runs had knock starting at 4900-5000 RPM. Knock varied between 1-4 degrees. Attached is a log from one of the runs. Should I...
a) Lower base timing (currently at 20 degrees)
b) Reduce timing based on IAT
c) Increase fueling (already well under 12:1)
d) Check for plug fouling and proper gap
e) Use colder than NGK TR6 plugs
f) Get water/alcohol injection to reduce IATs
g) All of the above
Thanks in advance for any advise!
Dan