Knock on 0 Column with Utec using Speed Density.
11-19-2007, 01:19 PM
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Knock on 0 Column with Utec using Speed Density.
Hey guys, I posted this here since most FI'ed cars uses Speed Density with Utec. Lately I have been getting some random knock on my 0 Column under ECU control (No Boost). This happen mainly on part throttle or just around before I hit 0psi boost. My A/F under no boost is the same the first time I got my car and never had this problem before. ECU doesnt seem to pull much timing when there is knock. I might clean my MAF in a few day and see if that help.
Here are some logs and any input is appreciated.
Here are some logs and any input is appreciated.
Code:
[TSMP][RPM][PSIG][MAF][TPS][LOD][KN][SIG] [IDC%][IGN][VOEF][BMV] [WBO2] 483.03 2502 -3.8 3.1 35 0 0 29.3 11.8 ECU 100 000 12.50 483.13 2529 -2.2 3.1 35 0 0 26.3 20.0 ECU 100 000 13.19 483.23 2485 -1.6 3.1 37 0 0 23.2 13.5 ECU 100 000 13.12 483.32 2536 -1.4 3.2 40 0 0 22.4 15.1 ECU 100 000 13.72 483.43 2570 -1.1 3.2 41 0 0 21.4 15.6 ECU 100 000 13.55 483.53 2544 -0.7 3.2 41 0 0 21.2 14.6 ECU 100 000 13.63 483.63 2558 -0.7 3.1 40 0 0 20.2 14.8 ECU 100 000 13.66 483.73 2572 -0.6 3.2 41 0 0 22.3 15.2 ECU 100 000 13.70 483.77 2604 -0.5 3.2 41 0 1 20.3 14.3 ECU 100 000 13.58 483.13 2529 -2.2 3.1 35 0 0 26.3 20.0 ECU 100 000 13.19 483.23 2485 -1.6 3.1 37 0 0 23.2 13.5 ECU 100 000 13.12 483.32 2536 -1.4 3.2 40 0 0 22.4 15.1 ECU 100 000 13.72 483.43 2570 -1.1 3.2 41 0 0 21.4 15.6 ECU 100 000 13.55 483.53 2544 -0.7 3.2 41 0 0 21.2 14.6 ECU 100 000 13.63 483.63 2558 -0.7 3.1 40 0 0 20.2 14.8 ECU 100 000 13.66 483.73 2572 -0.6 3.2 41 0 0 22.3 15.2 ECU 100 000 13.70 483.77 2604 -0.5 3.2 41 0 1 20.3 14.3 ECU 100 000 13.58 483.83 2618 -0.5 3.3 42 0 1 19.3 16.4 ECU 100 000 13.57 880.36 4480 -8.9 2.8 16 0 0 39.0 11.3 ECU 100 000 15.32 880.46 4504 -8.9 2.8 16 0 0 39.0 11.5 ECU 100 000 14.61 880.56 4492 -8.9 2.9 22 0 0 39.2 11.9 ECU 100 000 14.57 880.66 4522 -7.6 3.2 22 0 0 37.1 15.6 ECU 100 000 13.74 880.76 4541 -6.3 3.4 23 0 0 32.9 17.5 ECU 100 000 13.47 880.86 4528 -6.1 3.3 23 0 0 35.1 18.0 ECU 100 000 13.08 880.96 4553 -6.2 3.3 23 0 0 35.0 18.8 ECU 100 000 12.95 881.06 4578 -6.1 3.3 21 0 0 28.0 17.8 ECU 100 000 13.02 881.16 4572 -6.0 3.4 20 0 1 33.9 17.4 ECU 100 000 13.39
11-19-2007, 06:15 PM
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Originally Posted by athenG
Hey guys, I posted this here since most FI'ed cars uses Speed Density with Utec. Lately I have been getting some random knock on my 0 Column under ECU control (No Boost). This happen mainly on part throttle or just around before I hit 0psi boost. My A/F under no boost is the same the first time I got my car and never had this problem before. ECU doesnt seem to pull much timing when there is knock. I might clean my MAF in a few day and see if that help.
Here are some logs and any input is appreciated.
Here are some logs and any input is appreciated.
Code:
[TSMP][RPM][PSIG][MAF][TPS][LOD][KN][SIG] [IDC%][IGN][VOEF][BMV] [WBO2] 483.03 2502 -3.8 3.1 35 0 0 29.3 11.8 ECU 100 000 12.50 483.13 2529 -2.2 3.1 35 0 0 26.3 20.0 ECU 100 000 13.19 483.23 2485 -1.6 3.1 37 0 0 23.2 13.5 ECU 100 000 13.12 483.32 2536 -1.4 3.2 40 0 0 22.4 15.1 ECU 100 000 13.72 483.43 2570 -1.1 3.2 41 0 0 21.4 15.6 ECU 100 000 13.55 483.53 2544 -0.7 3.2 41 0 0 21.2 14.6 ECU 100 000 13.63 483.63 2558 -0.7 3.1 40 0 0 20.2 14.8 ECU 100 000 13.66 483.73 2572 -0.6 3.2 41 0 0 22.3 15.2 ECU 100 000 13.70 483.77 2604 -0.5 3.2 41 0 1 20.3 14.3 ECU 100 000 13.58 483.13 2529 -2.2 3.1 35 0 0 26.3 20.0 ECU 100 000 13.19 483.23 2485 -1.6 3.1 37 0 0 23.2 13.5 ECU 100 000 13.12 483.32 2536 -1.4 3.2 40 0 0 22.4 15.1 ECU 100 000 13.72 483.43 2570 -1.1 3.2 41 0 0 21.4 15.6 ECU 100 000 13.55 483.53 2544 -0.7 3.2 41 0 0 21.2 14.6 ECU 100 000 13.63 483.63 2558 -0.7 3.1 40 0 0 20.2 14.8 ECU 100 000 13.66 483.73 2572 -0.6 3.2 41 0 0 22.3 15.2 ECU 100 000 13.70 483.77 2604 -0.5 3.2 41 0 1 20.3 14.3 ECU 100 000 13.58 483.83 2618 -0.5 3.3 42 0 1 19.3 16.4 ECU 100 000 13.57 880.36 4480 -8.9 2.8 16 0 0 39.0 11.3 ECU 100 000 15.32 880.46 4504 -8.9 2.8 16 0 0 39.0 11.5 ECU 100 000 14.61 880.56 4492 -8.9 2.9 22 0 0 39.2 11.9 ECU 100 000 14.57 880.66 4522 -7.6 3.2 22 0 0 37.1 15.6 ECU 100 000 13.74 880.76 4541 -6.3 3.4 23 0 0 32.9 17.5 ECU 100 000 13.47 880.86 4528 -6.1 3.3 23 0 0 35.1 18.0 ECU 100 000 13.08 880.96 4553 -6.2 3.3 23 0 0 35.0 18.8 ECU 100 000 12.95 881.06 4578 -6.1 3.3 21 0 0 28.0 17.8 ECU 100 000 13.02 881.16 4572 -6.0 3.4 20 0 1 33.9 17.4 ECU 100 000 13.39
What kind of fuel are you using as well? Also whats it like on the transition into boost, how's your a/f in the 10% column?
Last edited by IntenseFab; 11-19-2007 at 06:18 PM.
11-19-2007, 06:46 PM
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Originally Posted by athenG
Hey guys, I posted this here since most FI'ed cars uses Speed Density with Utec. Lately I have been getting some random knock on my 0 Column under ECU control (No Boost). This happen mainly on part throttle or just around before I hit 0psi boost. My A/F under no boost is the same the first time I got my car and never had this problem before.
11-19-2007, 07:03 PM
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Originally Posted by IntenseFab
Post up your knock sensitivity as well as a chart of whats done to your car. That'd help alot What kind of fuel are you using as well? Also whats it like on the transition into boost, how's your a/f in the 10% column?
What kind of fuel are you using as well? Also whats it like on the transition into boost, how's your a/f in the 10% column?I always use 93 octane and also tuned for 93 octane. I have also used different Brand of Gas and have gone at least 4 tank of gas and still have problem. There is nothing done on the car except this thing start happening when the weather got colder. My A/F on my 10 Column is about 11.8-12.2 give and take so I don't think there is a big jump there. I was going to reduce the sensitivity on my Knock Threshold but never had this problem in the summer.
Last edited by athenG; 11-19-2007 at 07:05 PM.
11-20-2007, 02:33 PM
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Originally Posted by athenG
I have a 2005 G35 6MT (Revup) and have 440cc injector.
With 440cc injectors you have to take a good amount of fuel out of the MAF voltage which tends to increase the timing = mid throttle knocking. When we put together a similar setup we Flash the ECU to scale for the 440cc injectors and take out a few deg of factory timing in the pre-UTEC speed density zone.
Hope this helps,
11-20-2007, 03:09 PM
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Most of my knock happen in the 2000-3000 rpm (90% of the time) and my threshold there is set to 100 (max is 125). Are you saying that 100 is high for that rpm? I did some research and they suggest to set it up to 90 at 2000-3000rpm. I rarely get any knock higher than 3000.
Thanks for the input though!
Thanks for the input though!
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