Knock at low rpm and throttle

PharmCo · 01-31-2004, 12:30 PM

Hi,

I have a Vishnu stage 2 with top mount. I've been running delta dash logs over the last week to see how my tune is working. Last night I noticed that I'm getting knock at very low rpm and throttle. I had a knock event last night at 2000rpm and 20% throttle. I wasn't even into positive boost yet. It seems to only occur between 2000-3000rpm at 20%-40% throttle. Everywhere else I have great positive knock correction, low EGT, ect. ect.

I don't understand why or how I get knock at such low rpm and loads. Is there something wrong with my setup? Any suggestions? Thanks!

~PC

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PharmCo · 02-01-2004, 01:06 PM

Anybody got any clues on this? I took out a degree of timing across the board and that didn't help. I'm wondering if it is really knock.

~PC

PharmCo · 02-02-2004, 08:01 PM

Geez, no one has any clue about this??

~PC

cdvma · 02-02-2004, 08:39 PM

How about posting a log to look at.

PharmCo · 02-02-2004, 10:28 PM

Here are two logs. I was a bit off. It seems to only be reproducable below 2000 rpm. The first doesn't have timing the second does. Wow, tables are hard to do on here!

RPM Throttle% Knock° Manifold(psig) Knock

2095 0.00 0.00 -8.9 0
1986 0.00 0.00 -8.7 0
1904 0.00 0.00 -8.7 0
1825 1.20 0.00 -8.7 0
1794 9.40 0.00 -6.7 0
1738 16.9 -2.5 -1.7 1
1842 20.8 -2.5 -1.2 0
1879 31.8 -2.5 0.00 0
1957 50.6 -2.5 0.90 0
2043 52.2 0.00 1.20 0
2317 83.1 2.50 2.30 0
2432 83.1 4.50 2.60 0
2556 91.4 5.50 3.00 0
2691 91.8 7.50 3.30 0
2842 92.2 9.00 4.20 0
3006 92.5 9.50 5.10 0
3141 92.5 9.00 6.20 0
3372 92.5 9.00 7.80 0
3539 82.0 10.5 10.2 0
3811 81.2 8.50 13.9 0
4137 80.4 9.00 16.5 0
4360 77.6 9.00 15.7 0
4607 77.6 9.00 12.5 0
4912 77.6 8.00 10.2 0
5102 78.0 8.50 11.2 0
5423 76.1 9.00 12.8 0
5677 69.0 9.00 12.3 0
5850 52.9 8.00 10.2 0
5734 0.00 0.00 -5.7 0

RPM Ignition° Throttle% Knock° Manifold(psig) Knock
1829 33.0 6.30 0.00 -5.4 0
1849 21.5 22.7 -2.5 0.00 0
1853 21.0 22.7 -2.5 0.30 0
1872 21.0 22.7 -2.5 0.40 0
1880 21.5 22.7 -1.5 0.70 0
1890 22.5 22.7 -1.5 0.90 0
1927 22.5 22.7 -1.5 1.00 0
1929 24.0 22.7 0.00 1.00 0
1953 24.5 17.3 -1.5 0.60 0
1985 27.5 12.5 -1.5 -0.4 0
1993 30.5 10.2 -1.5 -2.3 0
1984 31.0 9.80 -1.5 -2.8 0
1982 31.0 9.80 -1.5 -2.9 0
2006 32.5 9.00 0.00 -3.0 0
2009 33.0 8.20 0.00 -3.6 0
2006 33.0 8.20 0.00 -3.9 0

01-31-2004, 12:30 PM	#1
PharmCo Scooby Newbie Member#: 11443 Join Date: Oct 2001 Location: Boulder, CO Vehicle: 2002 WRX Midnight Black	Knock at low rpm and throttle Hi, I have a Vishnu stage 2 with top mount. I've been running delta dash logs over the last week to see how my tune is working. Last night I noticed that I'm getting knock at very low rpm and throttle. I had a knock event last night at 2000rpm and 20% throttle. I wasn't even into positive boost yet. It seems to only occur between 2000-3000rpm at 20%-40% throttle. Everywhere else I have great positive knock correction, low EGT, ect. ect. I don't understand why or how I get knock at such low rpm and loads. Is there something wrong with my setup? Any suggestions? Thanks! ~PC * Registered users of the site do not see these ads.

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02-01-2004, 01:06 PM	#2
PharmCo Scooby Newbie Member#: 11443 Join Date: Oct 2001 Location: Boulder, CO Vehicle: 2002 WRX Midnight Black	Anybody got any clues on this? I took out a degree of timing across the board and that didn't help. I'm wondering if it is really knock. ~PC

02-02-2004, 08:01 PM	#3
PharmCo Scooby Newbie Member#: 11443 Join Date: Oct 2001 Location: Boulder, CO Vehicle: 2002 WRX Midnight Black	Geez, no one has any clue about this?? ~PC

02-02-2004, 08:39 PM	#4
cdvma Scooby Specialist Member#: 21980 Join Date: Jul 2002 Chapter/Region: NESIC Location: Central MA Vehicle: 2002 PSM WRX (Sold) 2009 BMW X5	How about posting a log to look at.

02-02-2004, 10:28 PM	#5
PharmCo Scooby Newbie Member#: 11443 Join Date: Oct 2001 Location: Boulder, CO Vehicle: 2002 WRX Midnight Black	Here are two logs. I was a bit off. It seems to only be reproducable below 2000 rpm. The first doesn't have timing the second does. Wow, tables are hard to do on here! RPM Throttle% Knock° Manifold(psig) Knock 2095 0.00 0.00 -8.9 0 1986 0.00 0.00 -8.7 0 1904 0.00 0.00 -8.7 0 1825 1.20 0.00 -8.7 0 1794 9.40 0.00 -6.7 0 1738 16.9 -2.5 -1.7 1 1842 20.8 -2.5 -1.2 0 1879 31.8 -2.5 0.00 0 1957 50.6 -2.5 0.90 0 2043 52.2 0.00 1.20 0 2317 83.1 2.50 2.30 0 2432 83.1 4.50 2.60 0 2556 91.4 5.50 3.00 0 2691 91.8 7.50 3.30 0 2842 92.2 9.00 4.20 0 3006 92.5 9.50 5.10 0 3141 92.5 9.00 6.20 0 3372 92.5 9.00 7.80 0 3539 82.0 10.5 10.2 0 3811 81.2 8.50 13.9 0 4137 80.4 9.00 16.5 0 4360 77.6 9.00 15.7 0 4607 77.6 9.00 12.5 0 4912 77.6 8.00 10.2 0 5102 78.0 8.50 11.2 0 5423 76.1 9.00 12.8 0 5677 69.0 9.00 12.3 0 5850 52.9 8.00 10.2 0 5734 0.00 0.00 -5.7 0 RPM Ignition° Throttle% Knock° Manifold(psig) Knock 1829 33.0 6.30 0.00 -5.4 0 1849 21.5 22.7 -2.5 0.00 0 1853 21.0 22.7 -2.5 0.30 0 1872 21.0 22.7 -2.5 0.40 0 1880 21.5 22.7 -1.5 0.70 0 1890 22.5 22.7 -1.5 0.90 0 1927 22.5 22.7 -1.5 1.00 0 1929 24.0 22.7 0.00 1.00 0 1953 24.5 17.3 -1.5 0.60 0 1985 27.5 12.5 -1.5 -0.4 0 1993 30.5 10.2 -1.5 -2.3 0 1984 31.0 9.80 -1.5 -2.8 0 1982 31.0 9.80 -1.5 -2.9 0 2006 32.5 9.00 0.00 -3.0 0 2009 33.0 8.20 0.00 -3.6 0 2006 33.0 8.20 0.00 -3.9 0