LT4 Knock module vs. LT1 Knock Module
#1
Le Mans Master
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LT4 Knock module vs. LT1 Knock Module
Has anyone ever looked at the spark advance and retard tables in the PCM on an LT1 with LT4 ESC (Electronic Spark Control Module also called knock module) installed, vs. an LT1 with it's stock LT1 ESC installed?
I wonder if ALL the LT4 ESC does is just be more accurate in deciding what is true knock vs. false knock? I was wondering if it changes any of the spark advance or retard values in the PCM tables.
Anyone know?
P.S. referring to the chip that plugs into bottom of the PCM, not the knock sensors that plug into the either side of the block.
I wonder if ALL the LT4 ESC does is just be more accurate in deciding what is true knock vs. false knock? I was wondering if it changes any of the spark advance or retard values in the PCM tables.
Anyone know?
P.S. referring to the chip that plugs into bottom of the PCM, not the knock sensors that plug into the either side of the block.
Last edited by Lone Ranger; 05-26-2005 at 02:09 PM.
#2
I wish I could help you out. I am curious about this too. The only thing that I can "think" is that the Lt4 would be a little more forgiving than the Lt1 module. As stated above this is just a "thought". I will be interested to see what the masses have to say about all this.
#3
I was wondering if it changes any of the spark advance or retard values in the PCM tables.
I wonder if ALL the LT4 ESC does is just be more accurate in deciding what is true knock vs. false knock?
#4
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Originally Posted by steve9899
Installing the knock module does not reprogram your PCM, therefore there are no changes to the tables.
It is less sensitive. That may be more accurate or not depending on circumstances. I suppose there might be cases where the LT4 KM ignored real knock that the LT1 would pick up.
It is less sensitive. That may be more accurate or not depending on circumstances. I suppose there might be cases where the LT4 KM ignored real knock that the LT1 would pick up.
#5
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St. Jude Donor '04-'05-'06-'07
From all I've ever read on the subject, The LT1 KM was just too sensitive to begin with. Add headers, roller rockers, etc. and the LT4 module becomes a necessity to extract full performance. I had an LT4 KM in my original short block when I had a bearing problem and believe me, it did it's job. It derated the engine so much that it wouldn't pull a greased string out of a cat's a$$!