09-26-2018, 09:06 AM | #1 |
The Mechanic
Drives: 1SS M Join Date: Dec 2017
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knock retard with headers
Has anyone with headers and mid pipes adjusted the knock sensor? I have been running the stock ignition map since adding the headers and always get knock on WOT. A/F is right on 12.5 so i have to assume this is vibrations transmitted thru the exhaust. typically its showing 1-3 degrees of retard. Any useful insight?
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09-26-2018, 01:58 PM | #2 |
Drives: 2016 2SS A8 Join Date: Feb 2016
Location: Conway, Arkansas
Posts: 217
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I had random knocks after headers/x-pipe. Talked with a few people an came to the conclusion that the LT1s are a bit noisier than the previous L99.
Adjust the recovery rate, so if it is false knock, it adds the timing back sooner and the threshold tables, so they aren't as sensitive (Cyl1 - Cyl8) [ECM] 12744 - Knock Retard Recovery Rate: This is the rate at which knock retard is removed in the absence of further knock. The higher this value is the faster knock retard will be removed. Knock Sensor Threshold Mult Cyl1: Multiplies knock sensor threshold when not in transient mode.
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09-27-2018, 08:00 AM | #3 | |
The Mechanic
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Quote:
Last edited by Joey Soul; 09-27-2018 at 11:21 PM. |
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09-27-2018, 11:18 AM | #4 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
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It should take the timing after you make the adjustments to the tables pictured above. The knock sensor level table is the sensitivity.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
09-27-2018, 09:59 PM | #5 |
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10-01-2018, 08:42 AM | #6 |
Drives: BLUE CAMARO ZL1 1LE M6 Join Date: Jun 2009
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Be careful DI motors don't need more timing unless you run race fuel or E
Ted.
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10-01-2018, 11:37 AM | #7 |
The Mechanic
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im still running 93 because the limited e85 stations around me. About what is the max you wouldnt recommend going past? ive only tuned my frs before this and i was running 28-30 degrees at WOT but that engine also has direct and port inj.
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10-01-2018, 12:08 PM | #8 |
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You said it above
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10-01-2018, 06:22 PM | #9 | |
Drives: 2016 2SS A8 Join Date: Feb 2016
Location: Conway, Arkansas
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Quote:
The stock spark tables really aren't that bad for 93, I didn't add much timing to mine before switching to E85 full time, so I'm not sure what the limits are. You might be better off adjusting the parameters that dictate total timing so the ECU has more freedom to add timing on its own as it deems needed//acceptable. EX: Humidity, IAT, and ECT tables. Something to be mindful of that just because a car will take more timing doesn't mean it's making more power. EX: https://youtu.be/m-Sj8WkWH6E?t=2m52s
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16 Summit White 2SS-MRC-NPP-A8 :: PrayPorted IM - LT5 TB - Mishimoto Catch Can - RotorFab - E85 - TSP 2" LongTubes - Speed Engineering X/Mid Pipe
DIY Hpt Tune - DR - 1.75-60' - 7.47@95 - 11.56@120 with +2676DA |
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10-01-2018, 09:02 PM | #10 | |
The Mechanic
Drives: 1SS M Join Date: Dec 2017
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spot on thanks. im at 24 degrees no knock and working my way up.
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10-02-2018, 10:49 AM | #11 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
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24 degrees is about where you want to be on 93.
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2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
11-12-2018, 06:20 AM | #12 | |
Drives: C5 Z06 LS7 Join Date: Jun 2014
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