150 shot getting knock keep bumping down timing?
12-01-2013, 10:39 AM
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150 shot getting knock keep bumping down timing? I have a 98 c5 spraying it with a 150 wet shot. I originally pulled 8 deg timing leaving me at about 20-21 total timing and logged for knock and had none making a single gear pull (3rd gear). where i see knock is a soon as i shift into the next gear. Ex: 2nd gear roll i don't see any knock until shifting into 3rd. I have taken timing out of it twice taking me to about 16-18 deg total timing i feel like I'm chasing my tail. Any help would be awesome. Thanks!!
12-01-2013, 08:00 PM
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How are you pulling timing ? Hp tuners? Lnc2000? And dumb question were you getting knock prior to the nitrous activation? 8 degrees seems a bit much for 150 shot ..I wouldov started pulling 6 degrees then check plugs... are you sure your noids are working? Hope this helps
12-02-2013, 08:54 AM
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How are you pulling timing ? Hp tuners? Lnc2000? And dumb question were you getting knock prior to the nitrous activation? 8 degrees seems a bit much for 150 shot ..I wouldov started pulling 6 degrees then check plugs... are you sure your noids are working? Hope this helps
-Garrett
12-03-2013, 08:12 AM
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Hp tuners is where im pulling it from i know its seems high im just trying to be safe. When it hits in that first gear it pulls awesome so i know know both noids are working and afr is at 11.9-12.4 . i also heard that 98 have sensitive knock sensors on them? Motor has 100k on it would a top end clean help? thanks !!
12-03-2013, 12:04 PM
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I have heard of cases of phantom knock, however I really think op should put some fresh plugs in (BR7EF) make a pass and check the plugs. If then the plugs coincide with the AFR's then I would double check my NA tune. Tuning on AFR alone is not the best way with nitrous IMHO. Good luck op I hope you can resolve your issue.
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12-04-2013, 08:47 AM
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I have heard of cases of phantom knock, however I really think op should put some fresh plugs in (BR7EF) make a pass and check the plugs. If then the plugs coincide with the AFR's then I would double check my NA tune. Tuning on AFR alone is not the best way with nitrous IMHO. Good luck op I hope you can resolve your issue.
-Garrett
12-05-2013, 09:54 AM
#16
friends car was also giving knock on the shifts due to some worn out stock motor mounts. Put in some poly ones and it went away. we were scratching our heads for a while on it. Since you have HPT i would just get rid of the burst knock retard and see if that clears it up.
12-05-2013, 10:47 PM
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What Octane Fuel are you using ?? You never mentioned the Fuel Octane that you are using when you spray your engine.
You should be using 100 Octane Race Fuel to make good power & to prevent Detonation while injecting Nitrous Oxide.
You should be using 100 Octane Race Fuel to make good power & to prevent Detonation while injecting Nitrous Oxide.