How do you stop false knock or prevent it?
Thread Starter
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Joined: Jul 2014
Posts: 3
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How do you stop false knock or prevent it? I have a 94 z28 lt1 383.Its got cam,headers,roller rockers,fully ported lt1 heads.I cant find a LT4 knock module so im facing the fact that the car may never get one.With that being the case,How do I stop or prevent false knock?Im about to break the engine in a few days from now so im trying to make sure that all the HP is where it should be.No false spark retard.Thanks
I had the tune in mine changed so it couldn't pull timing. I checked and checked and rechecked everything. Ran high octane fuel in. Checked the rockers numerous times,
Would still pull timing and register knock so I tuned it out
Would still pull timing and register knock so I tuned it out
TECH Addict
Joined: Dec 2010
Posts: 2,610
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From: Maricopa, AZ
I know the feeling. I'm chasing mine too. Got it almost all gone now. Just have to find all the spots that vibrate and cause false knock. My Y-pipe would vibrate against my cross-member, fixed that. But my drivers side header will occasionally hit the motor mount. Ugh.
I too tuned knock retard to zero after ensuring absolutely no real knock is happening.
I too tuned knock retard to zero after ensuring absolutely no real knock is happening.
this seems a common w/ lt1's. I have mine tuned out also. I've heard ( not sure I buy into it but this is what I was told) that with the thin metal of headers compared to stock manifolds that the traveling gas sound that is omitted from the pipes will cause false knock. This guy wrapped his pipes and according to him it went away. idk but that's what was told to me. I'm not about to wrap my headers b/c of that one.
TECH Addict
Joined: Dec 2010
Posts: 2,610
Likes: 4
From: Maricopa, AZ
this seems a common w/ lt1's. I have mine tuned out also. I've heard ( not sure I buy into it but this is what I was told) that with the thin metal of headers compared to stock manifolds that the traveling gas sound that is omitted from the pipes will cause false knock. This guy wrapped his pipes and according to him it went away. idk but that's what was told to me. I'm not about to wrap my headers b/c of that one.
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Thread Starter
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Joined: Jul 2014
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Solomon Kostelnik tuned it for me.I still got 1 tune left.I think ill let him tune it out like you say.Looks like the only option.Maybe I can at least make the spark retard minimal when it does get knock.False or not.Thanks man.
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