MN C5 Posted November 8, 2003 Report Share Posted November 8, 2003 I'm interested in seeing if the Radix causes false Knock. If anyone has the ability to scan there truck vai Auto Tap or Ease ect... I'm seeing KR of between 3.4 & 3.8 at the 4800 mark.. I've tuned it pig rich and dropped the timing to 19 with 100 octane and it didn't go away. It was slightly lower by mabey .1 or less. I'm wondering if its happening right after the shift because the Cylinder pressure spikes because of the RPM drop and the blower can slip the belt a little. Anyway I'd like some input from others with the Radix on this... Or if you've got an opinion chime in Link to comment Share on other sites More sharing options...
zippy Posted November 8, 2003 Report Share Posted November 8, 2003 does the kr stay there or does it mearly come at x rpm and go away at x. Link to comment Share on other sites More sharing options...
MN C5 Posted November 8, 2003 Author Report Share Posted November 8, 2003 does the kr stay there or does it mearly come at x rpm and go away at x. KR is not a on off situation. Depends on the decay rate as to how fast it will fade from its highest value. Link to comment Share on other sites More sharing options...
zippy Posted November 8, 2003 Report Share Posted November 8, 2003 i kinda worded that improperly. i worked with kr alot so i know what you're referring to. i was trying to word that as is it sticking around or just a burst type kr. if you're seeing that much kr at 4800, is as much still being commanded at say 5400? what are the knock counts at? any specific gear it does it worse in? one of them i've recently been working on is great 2nd through 4th gear, but anywhere in first gear and into the second gear shift it would show up over7 degrees of kr. Link to comment Share on other sites More sharing options...
redsilveradoSS Posted November 8, 2003 Report Share Posted November 8, 2003 For us non mechanical guys out here........................................... WTF???? Link to comment Share on other sites More sharing options...
MN C5 Posted November 8, 2003 Author Report Share Posted November 8, 2003 i kinda worded that improperly. i worked with kr alot so i know what you're referring to. i was trying to word that as is it sticking around or just a burst type kr. if you're seeing that much kr at 4800, is as much still being commanded at say 5400? what are the knock counts at? any specific gear it does it worse in? one of them i've recently been working on is great 2nd through 4th gear, but anywhere in first gear and into the second gear shift it would show up over7 degrees of kr. Gotcha Zippy, the KR starts @ 1.somthing and climbs quickly reaching a peak and then falling only a tenth or two. And because I'm seeing it after peak TQ it makes me Suspicious So to answer your question it doesn't go away after a certain rpm. Because a rich mixture with low timing and 100 octane didn't remove more than a tenth or two may mean something. And the gear its in doesn't seem to matter. There has to be a few guys with some Radix data logs Link to comment Share on other sites More sharing options...
BigTex Posted November 8, 2003 Report Share Posted November 8, 2003 Is it in any specific gear? I have KR in 1st gear that peaks in the mid 4000s (probablty near torque peak), then does its normal decay. I have a little KR in the other gears, but not as much. I think I've seen it near 7* in that spot. My timing is in 27* range before KR kills it. I don't think my problem is REALLY knock. I have a feeling its either TM or something else. I have a plug-in knock sensor de-sensitizer (nineball's knock out box). It basically removed all KR from my last truck. On this truck, I still see KR in that range. I'm wondering if the PCM is calculating a value above its torque peak limit. If so, it would retard timing, but I'm not sure if it would use KR to do so. Here is a sample from a recent run: RPM - O2 B1 - KR - timing - MAF 2782 - 0.910 - 0.7 - 23.0 - 20.90 3228 - 0.905 - 0.6 - 23.5 - 26.02 3900 - 0.900 - 2.0 - 23.5 - 32.50 4718 - 0.910 - 5.9 - 20.0 - 42.15 5590 - 0.895 - 5.3 - 20.5 - 43.89 6383 - 0.860 - 4.9 - 20.5 - 42.98 5436 - 0.900 - 4.4 - 21.0 - 28.89 4341 - 0.900 - 3.8 - 21.5 - 32.99 4606 - 0.895 - 3.4 - 22.0 - 36.61 4852 - 0.875 - 3.0 - 22.5 - 36.87 5130 - 0.860 - 2.6 - 23.0 - 38.62 5368 - 0.870 - 2.4 - 23.5 - 38.51 5596 - 0.860 - 2.0 - 24.0 - 39.20 5830 - 0.860 - 1.8 - 24.5 - 38.86 6024 - 0.860 - 1.5 - 25.0 - 41.33 6229 - 0.855 - 1.2 - 25.5 - 39.09 4445 - 0.880 - 1.1 - 25.0 - 31.72 4184 - 0.860 - 1.0 - 25.5 - 28.89 4197 - 0.865 - 0.9 - 25.5 - 29.10 4196 - 0.860 - 0.7 - 26.0 - 29.48 4220 - 0.865 - 0.5 - 26.5 - 27.40 4282 - 0.870 - 0.4 - 27.0 - 27.79 4352 - 0.865 - 0.3 - 27.0 - 32.03 4402 - 0.875 - 0.2 - 27.5 - 31.11 It looks like I've got to kick up the decay rate. It seems all KR is generated in 1st, but takes forever to go away and kills my second gear timing. Gotta get my injectors taken care of. My wideband shows 13.3:1 at the top of each gear and my PCM is telling the injectors to flow 110% of their possible flow. Link to comment Share on other sites More sharing options...
MN C5 Posted November 9, 2003 Author Report Share Posted November 9, 2003 Thanks BigTex, Delivery Thursday/Friday Link to comment Share on other sites More sharing options...
zippy Posted November 9, 2003 Report Share Posted November 9, 2003 i'm going to guess on the two situations being different since big tex's appears to be a lean condition, but thinking on your's mn, i wonder if there is a possibility of any play in the internal assembly on the radix. with the location of the knock sensors in relation to the blower and the speeds your's turns, it seems a possibility any internal rattling/internal noise may be picked up by the knock sensors. the response from jim moran in this months gmhtp might also be something to glance at. i'll check other boards and ask around still, i'd like to find something to be of help to ya. Link to comment Share on other sites More sharing options...
MN C5 Posted November 9, 2003 Author Report Share Posted November 9, 2003 i'm going to guess on the two situations being different since big tex's appears to be a lean condition, but thinking on your's mn, i wonder if there is a possibility of any play in the internal assembly on the radix. with the location of the knock sensors in relation to the blower and the speeds your's turns, it seems a possibility any internal rattling/internal noise may be picked up by the knock sensors. the response from jim moran in this months gmhtp might also be something to glance at. i'll check other boards and ask around still, i'd like to find something to be of help to ya. Thanks Zip Link to comment Share on other sites More sharing options...
BigTex Posted November 9, 2003 Report Share Posted November 9, 2003 I don't think my KR is due to being lean. I just made that note so if someone read my logs, they would know that I know I'm a little lean. I personally think the iron blocks generate a differnet internal harmonic than the aluminum block. I think the knock sensors are overly sesnitive on our trucks. Both Gen III trucks I've owned have seen some KR when it shouldn't have. Neither had ping or knock problems. I have logged a buddys Fbody and it sounds like a rattle trap, all bumping and lumpy from a cam. His sees very little KR if any. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.