LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Knock Retard

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Old Feb 14, 2003 | 09:36 PM
  #1  
94 Roadhog's Avatar
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From: N. Augusta SC
Knock Retard

What is a resonable knock count (I have Freescan data logging)
for a stock lt1 ? I have made 4 loggings at idle and on the road,
my knock count is constitant on each run but different numbers per run and knock retard on all loggings is 0 . I am trying to determine if this might be the reason the engine is sluggish but
I dont know what Im suspose to be getting.
Old Feb 15, 2003 | 09:51 AM
  #2  
EviLBoX's Avatar
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I've noticed that also. I've never seen the knock count actually change, but on different runs the knock count is different even though I'm getting 0.0 degrees of knock retard. I'm not even sure how the two are related, I've never gotten an answer on this.
Old Feb 15, 2003 | 10:02 AM
  #3  
unTAmedLS1's Avatar
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At least you arent having my problem. I am getting over 3000 knock counts on autotap and a constant 8 degrees of knock under load and 11 degrees at highrpms but my motor doesnt knock. I have changed module and sensor and yes I have tried high octane fuel but tht doesnt work either. Its so annoying becuas eit feels like I hit rev limiter
Old Feb 17, 2003 | 09:04 AM
  #4  
94 Roadhog's Avatar
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Thanks guys,
I was not sure if I had a problem here and needed to go to a LT4
K-module or not , My knock count is in the 3000s but 0 retard.
I have looked on the web to try finding what normal readings would be but cant find any . Thanks again
Dave B
Old Feb 17, 2003 | 09:28 AM
  #5  
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Originally posted by unTAmedLS1
At least you arent having my problem. I am getting over 3000 knock counts on autotap and a constant 8 degrees of knock under load and 11 degrees at highrpms but my motor doesnt knock. I have changed module and sensor and yes I have tried high octane fuel but tht doesnt work either. Its so annoying becuas eit feels like I hit rev limiter
I've been there before...I just got done getting rid of 9 degrees of knock retard under load. MAKE SURE YOU HAVE ZERO, AND I MEAN ZERO exhaust leaks...I had one all the way in the back of the car where my cutout was welded...I just put some JB weld on it as a temporary deal, and no more knock retard. I see you have a cutout as well, make DAMN sure that whoever welded it, welded the thing tight and NOTHING is leaky. If you have the cutout plate on, make sure it isn't leaky. I've been through EXACTLY what you are going through, so I will help out if you need me....DubbyZ28Camaro@aol.com is my e-mail..

Later
Old Feb 17, 2003 | 11:11 AM
  #6  
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[QUOTE]Originally posted by unTAmedLS1
....I am getting over 3000 knock counts on autotap and a constant 8 degrees of knock under load and 11 degrees at highrpms but my motor doesnt knock. ......[QUOTE]

You are getting 8 degrees of knock retard, not 8 degrees of "knock".... that's why you don't hear any knock... the sensor and retard system is there to prevent knock. I'd be a little wary of your 85mm MAF sensor... if the calibration is off, you might be leaning out at WOT, when there are no long term fuel corrections to compensate.

As far as "knock count", it appears to be a cumulative number that simply continues to build as any knock signal is encountered. Eventually it will reach the numerical limit, and reset to "0". As long as the count stays constant during a logged run, there are no knock counts being added.
Old Feb 17, 2003 | 03:05 PM
  #7  
unTAmedLS1's Avatar
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I checked my fuel trims and at WOT at high rpms if anything IM running richit was doing it before the maf. The higher the load the higher the retard
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