Lt4
Thread Starter
Pro Mechanic
Joined: Oct 1999
Posts: 3,905
Likes: 1,440
From: South-Central Coast California
Lt4
Forum members-
There is an urban legend I hear quite occasionally about the knock sensors used on the 1996 LT4 engines. Supposedly, they have different (perhaps less or more narrow banded) sensitivity than other KSes used in Gen 2 engines.
Has anyone here replaced the KSes on an engine other than an LT4 with LT4 KSes in an attempt to reduce the amount of "false" knock retard incidents do to valve train noise?
Was your attempt sucessful?
How did you validate that sucess?
There is an urban legend I hear quite occasionally about the knock sensors used on the 1996 LT4 engines. Supposedly, they have different (perhaps less or more narrow banded) sensitivity than other KSes used in Gen 2 engines.
Has anyone here replaced the KSes on an engine other than an LT4 with LT4 KSes in an attempt to reduce the amount of "false" knock retard incidents do to valve train noise?
Was your attempt sucessful?
How did you validate that sucess?
Pro
Joined: Sep 2001
Posts: 542
Likes: 1
From: Stuck in the 80's
I have heard the same and seen where some LT1/LT1 to LT4 upgrade owners have done the swap but I have not seen any before vs. after results.
I have done this upgrade,
https://www.corvetteforum.com/techti...D=99&TopicID=2
and did verify lower ESC OUT counts and lower timing retard with my scan tool, all else being as equal as I could such as RPM, coolant temp, LV8, etc.
I have done this upgrade,
https://www.corvetteforum.com/techti...D=99&TopicID=2
and did verify lower ESC OUT counts and lower timing retard with my scan tool, all else being as equal as I could such as RPM, coolant temp, LV8, etc.
Safety Car
Joined: Apr 2003
Posts: 3,793
Likes: 9
From: VA
Hib,
The modification is replacing the Knock Module in the PCM, not the sensors themselves.
The theory is that the roller rockers on the LT4 cause false knock, and that the LT4 module was tuned to ignore that false knock.
I have no personal experience with it, but enough people have reported that it reduces knock counts that it seems pretty believable.
What I have read about the sensors themselves is that you cannot swap sensors between an OBD2 and OBD1 car. Different resistance I think.
The LT4 Knock Module can only be installed on 94-96 LT1s.
Hopefully one of our tuners who has seen this first hand will chime in.
Regards,
Steve
The modification is replacing the Knock Module in the PCM, not the sensors themselves.
The theory is that the roller rockers on the LT4 cause false knock, and that the LT4 module was tuned to ignore that false knock.
I have no personal experience with it, but enough people have reported that it reduces knock counts that it seems pretty believable.
What I have read about the sensors themselves is that you cannot swap sensors between an OBD2 and OBD1 car. Different resistance I think.
The LT4 Knock Module can only be installed on 94-96 LT1s.
Hopefully one of our tuners who has seen this first hand will chime in.
Regards,
Steve
Safety Car
Joined: Apr 2003
Posts: 3,793
Likes: 9
From: VA
A quick search found that Ion Soltan mentions it on his website, along with a comment that implies that he can accomplish the same thing through programming.
You might email him - I bet he has some first hand experience he can share.
http://www.madz28.com/faq.php#question16
You might email him - I bet he has some first hand experience he can share.
http://www.madz28.com/faq.php#question16
