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XfireZ51 · 10-17-2019

Bringing this one up again because I continue to play around w it. A couple of questions come to mind, ideally for the likes of Graham and/Marc. But please chime in if u have 'played" around w this as well.

I have attached a pic w the stock Knock Retard values for the 92 LT-5.

My questions are:

1. Given that many of us have modified our motors, drivetrain, clutch etc., as Graham has stated, we have introduced other "noise" for the knock sensor to detect. How much from stock values would it be prudent to reduce the sensitivity of the sensor and still retain a level of protection from knock?
I believe Marc feels comfortable w modifying the attack and decay rates by +/- 50% depending on the parameter.

2. In the pic I have attached, the parameter for SA v MAT is displayed.
Just to clarify, this is showing that beginning at a MAT of 43C, the ECM is
retarding timing by 3*, correct?

The pic also shows that MAX Retard in PE for the 405hp motors is 4.92*
while the 375hp motors may retard timing by a minimum of ~7* in PE.
What changed to bring that about? Would it be ok to use the 93-95 settings
for the 375hp motors?

10-17-2019	#29
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,686	Re: Knock. A question for Graham or Marc Bringing this one up again because I continue to play around w it. A couple of questions come to mind, ideally for the likes of Graham and/Marc. But please chime in if u have 'played" around w this as well. I have attached a pic w the stock Knock Retard values for the 92 LT-5. My questions are: 1. Given that many of us have modified our motors, drivetrain, clutch etc., as Graham has stated, we have introduced other "noise" for the knock sensor to detect. How much from stock values would it be prudent to reduce the sensitivity of the sensor and still retain a level of protection from knock? I believe Marc feels comfortable w modifying the attack and decay rates by +/- 50% depending on the parameter. 2. In the pic I have attached, the parameter for SA v MAT is displayed. Just to clarify, this is showing that beginning at a MAT of 43C, the ECM is retarding timing by 3, correct? The pic also shows that MAX Retard in PE for the 405hp motors is 4.92 while the 375hp motors may retard timing by a minimum of ~7* in PE. What changed to bring that about? Would it be ok to use the 93-95 settings for the 375hp motors? Last edited by XfireZ51; 03-08-2024 at 02:09 PM.