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XfireZ51 · 09-29-2019

Usually the discussion of Knock comes up when focusing on WOT tuning. However, after modifying a motor, I’m very much engaged in driveability tuning so part throttle, decel, idle is where I spend a lot of my time. Getting this area right is a prereq to moving onto WOT as far as I am concerned. And part of that tuning process is optimizing the spark advance for responsiveness and economy.
It would be helpful to know what the “knock signature” of the LT-5 is in a stock configuration. Did the stock calibration eliminate all knock under normal operating conditions, or if I datalog a completely stock motor, would I still record some knock happening? And if so, where?
Granted w a modified motor we are likely exacerbating the incidence of knock, (especially when using a SM FW), but it would be interesting to compare to what areas the stock motor, w stock cal, demonstrates an inherent tendency to knock.
Is the modified motor now exhibiting knock in areas where the stock motor does not?

09-29-2019	#1
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,686	Re: Knock. A question for Graham or Marc Usually the discussion of Knock comes up when focusing on WOT tuning. However, after modifying a motor, I’m very much engaged in driveability tuning so part throttle, decel, idle is where I spend a lot of my time. Getting this area right is a prereq to moving onto WOT as far as I am concerned. And part of that tuning process is optimizing the spark advance for responsiveness and economy. It would be helpful to know what the “knock signature” of the LT-5 is in a stock configuration. Did the stock calibration eliminate all knock under normal operating conditions, or if I datalog a completely stock motor, would I still record some knock happening? And if so, where? Granted w a modified motor we are likely exacerbating the incidence of knock, (especially when using a SM FW), but it would be interesting to compare to what areas the stock motor, w stock cal, demonstrates an inherent tendency to knock. Is the modified motor now exhibiting knock in areas where the stock motor does not?