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Old 09-26-2018, 09:06 AM   #1
Joey Soul
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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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Old 09-26-2018, 01:58 PM   #2
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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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Old 09-27-2018, 08:00 AM   #3
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Quote:
Originally Posted by KonigWolf View Post
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.
thanks man this is exactly what i was looking for, i will put in the numbers and give it a shot. ive been trying to put a little more timing in it but the engine hates anything over 21-22 degrees

Last edited by Joey Soul; 09-27-2018 at 11:21 PM.
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Old 09-27-2018, 11:18 AM   #4
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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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Old 09-27-2018, 09:59 PM   #5
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Quote:
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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.
oh ok cool. thanks
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Old 10-01-2018, 08:42 AM   #6
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Be careful DI motors don't need more timing unless you run race fuel or E

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Old 10-01-2018, 11:37 AM   #7
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Quote:
Originally Posted by JANNETTYRACING View Post
Be careful DI motors don't need more timing unless you run race fuel or E

Ted.
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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Old 10-01-2018, 12:08 PM   #8
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Quote:
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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.
You said it above
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Old 10-01-2018, 06:22 PM   #9
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Quote:
Originally Posted by Joey Soul View Post
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.

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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Old 10-01-2018, 09:02 PM   #10
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Quote:
Originally Posted by JANNETTYRACING View Post
You said it above
spot on thanks. im at 24 degrees no knock and working my way up.

Quote:
Originally Posted by KonigWolf View Post
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
I gave the video a look, funny looks like he is tuning a frs/brz from the interior. When i went turbo on mine i was around 17-18 degrees timing as well lol. But i know what you mean by getting the total timing. Ive zeroed my general operating zones on most tables so that only the cam table and main table are in play in safe conditions. I just going off the butt dyno for now. Next season ill throw it on the dyno again after a few more pieces of hardware and dial it in perfectly.
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Old 10-02-2018, 10:49 AM   #11
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24 degrees is about where you want to be on 93.
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Old 11-12-2018, 06:20 AM   #12
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Quote:
Originally Posted by KonigWolf View Post
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.
Increasing the Knock Retard rate at this level makes the knock sensors COMPLETELY USELESS!
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