Knock Retard from the A4
08-22-2008, 07:17 AM
#3
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I was getting a fair amount of KR in the 3300-4000 rpm range even though the fueling was good and the timing was very conservative - chased it for a long time : lowering timing, etc. Finally figured out that it was a combination of noise from the 3600 stall TC and the valvetrain (Futral F-14 cam, etc) all hitting the seemingly right harmonics when the TC was unlocked, especially under part throttle - put all my timing settings back, reduced the sensitivity of the knock sensors in that rpm range and KR went totally away. I'm going to eventually install the later model knock sensors / harness and see if that may help, but for now, everything appears good. It took a lot of datalogging and driving to determine the conditions where it was happening.
I am paying particular attention to any possible detonation - sounds, visible inspection of the plugs, etc - so far, it's all OK.
If your KR is happening all the time under the same conditions - WOT/downshift - it may just be too much timing for that particular load - will take a lot of work to resolve.
Bird
I am paying particular attention to any possible detonation - sounds, visible inspection of the plugs, etc - so far, it's all OK.
If your KR is happening all the time under the same conditions - WOT/downshift - it may just be too much timing for that particular load - will take a lot of work to resolve.
Bird
Last edited by Bird; 08-22-2008 at 07:23 AM.
08-22-2008, 03:01 PM
#4
Thanks
I use 93 octane from main brands and different all the time...and even added octane booster, KR still there so don't think it can be fuel.
I kept lowering spark until it was real low...still had KR...thanks to a senior tuners help he believes it to be the stall converter and could be in combo with the dual springs and cam, the knock tables have been modified to be less sensitive...didn't know if there is another way to attack this like maybe some of the trans. settings, I have modded my trans settings and think it shifts good, not to soft and not to hard but thought maybe there is something to make the downshift smoother or not make the converter "hit" so hard.
Thanks
I use 93 octane from main brands and different all the time...and even added octane booster, KR still there so don't think it can be fuel.
I kept lowering spark until it was real low...still had KR...thanks to a senior tuners help he believes it to be the stall converter and could be in combo with the dual springs and cam, the knock tables have been modified to be less sensitive...didn't know if there is another way to attack this like maybe some of the trans. settings, I have modded my trans settings and think it shifts good, not to soft and not to hard but thought maybe there is something to make the downshift smoother or not make the converter "hit" so hard.
Thanks
10-03-2008, 11:22 PM
#5
I was getting a fair amount of KR in the 3300-4000 rpm range even though the fueling was good and the timing was very conservative - chased it for a long time : lowering timing, etc. Finally figured out that it was a combination of noise from the 3600 stall TC and the valvetrain (Futral F-14 cam, etc) all hitting the seemingly right harmonics when the TC was unlocked, especially under part throttle - put all my timing settings back, reduced the sensitivity of the knock sensors in that rpm range and KR went totally away. I'm going to eventually install the later model knock sensors / harness and see if that may help, but for now, everything appears good. It took a lot of datalogging and driving to determine the conditions where it was happening.
I am paying particular attention to any possible detonation - sounds, visible inspection of the plugs, etc - so far, it's all OK.
If your KR is happening all the time under the same conditions - WOT/downshift - it may just be too much timing for that particular load - will take a lot of work to resolve.
Bird
I am paying particular attention to any possible detonation - sounds, visible inspection of the plugs, etc - so far, it's all OK.
If your KR is happening all the time under the same conditions - WOT/downshift - it may just be too much timing for that particular load - will take a lot of work to resolve.
Bird
