How is it possible to be getting 8 degrees of knock retard at 55% tp with a air/fuel at 10.6 at 5psi of boost? I mean you can be any where below 55% tp and floor it with no retard but above that the instant u roll into the throttle it goes right to 8 degrees retard?

 

and it doesn't matter what pulley i have on. From a pulley that makes 7-8psi or one that makes 10-11 psi it does the same thing.

 

have you zero'd your burst knock tables?

When ever I'm having a timing issue I use a config file that has every single timing pid available in the table. KR does not necessarily mean it knocking.

 

While tuning mine on the dyno it constantly pulled 7 deg. They even set total timing at only 3 deg and it still pulled 7 deg. They ended up turning the sensors off and made several pulls while checking the spark plugs, afr... I made max power with only 12 deg so they just left them off thinking they were picking up noise from the blower.

 

THAT is scary!

 

Mine was doing basically the same thing after I put the cam, dual springs, 3" pulley, and louder exhaust on. I never had any KR prior to these changes and was running 16*-19* of timing under boost. I dropped the timing clear to 6* and it made no difference.

I was pretty sure it was the exhaust or springs or a combination. The KR was at throttle roll-in from steady-state cruise; if I kept rolling into the throttle I could keep the KR running. As soon as I let off the throttle the KR would immediately decay to zero. The KR was typically right where the exhaust had the highest resonance - it is bad enough that it's vibrating the floorboards noticeably at its peak.

I ended up tweaking the knock sensor Tip in TPS and Tip in RPM slightly in the areas where there was KR, 1600-2800 rpm, and also desensitizing the knock sensors slightly in the same area. The KR was gone after the first small tweaks. I bumped the timing back up to 12* and was still good. I am planning to bump it back to 14* in those areas next, scan it, and call it good. I'm also adding a resonator to the exhaust and then increasing the knock sensor sensitivity back where it was to see what happens; the exhaust is resonating a little too much for my liking.

 

It could be a bad knock sensor.... when they or one of them is bad it automatically pulls 8 degs past 55% throttle

 

This dam thing is moody. Last night i was out testing and the knock retard was at the most 3 degrees retard and that was a totally different tp have before. But that's the way its been with this truck it is always something different just depends on the day.

Blown 06-As far as the burst knock table not sure what they are set at.

Avalanche2002-This a happened after i put on headers and the cam.

00Z71-I put new GM knock sensors in at the time the 6.0 was installed w/cam and headers. It seems like ever since then it has set a po327 code.

 

Do you hear the actual knocking outside the vehicle? the only reason why I'm asking is because, I'm having similiar issues and I'm about ready to burn my truck..#7

 

no i can't hear any detenation and i have a pretty sharp ear for it. I can hear it in other vehicles when other people cant. I am guessing the majority is a false knock. My tuner is looking into a couple things on his tune so we will see.