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05-19-2009, 06:46 PM | #1 |
Scooby Guru
Member#: 173241
Join Date: Feb 2008
Chapter/Region:
TXIC
Location: Houston, Tx
Vehicle:2002 s256 twinscroll now with one more gear |
high RPM knock
i have been trying to tune and everytime i try to add timing i will get knock form 6k up. both fine learning (1.05) and feed back (2.11) the thing is the car has done if from the stage two original tune. if i run 19degrees timing i am fine, but anything over it i get knock consistanly, even some times at 19 i will. i dont get any signs of knock anywhere else. now the biggest thing i am wondering is that how am i getting knock? all of my knock is turned off above 6k, and yet i keep getting it. my mods are
vf37-20g wheel oem twinscroll exhaust with 3inch straight pipe turbo back. perrin crank pulley modded stock injectors aps turbo inlet sti top mount walbro fuel pump. K and N drop in filter
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05-19-2009, 07:29 PM | #2 |
Scooby Specialist
Member#: 68448
Join Date: Aug 2004
Chapter/Region:
NWIC
Location: Ellensburg, WA
Vehicle:2008 WRX STi Cobb tunned by Surgeline |
Have a log?
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05-19-2009, 09:16 PM | #3 |
Scooby Specialist
Member#: 156973
Join Date: Aug 2007
Chapter/Region:
International
Location: Adelaide, Australia
Vehicle:2002 ADM WRX STi STi Black/Blue |
high load high rpm knock is the most dangerous type. The last thing you want to do is ignore it. This kind of knock is what kills engines.
If you are knocking above 19deg then unfortunately that is as much timing as your motor seems to support given the fuel used - or you are leaning out and that is causing the knock and not the timing. As posted above, do you have a log? Post it here and ppl will be able to better determine the problem and a solution. |
05-20-2009, 12:19 AM | #4 |
Scooby Guru
Member#: 173241
Join Date: Feb 2008
Chapter/Region:
TXIC
Location: Houston, Tx
Vehicle:2002 s256 twinscroll now with one more gear |
yea i got a few give me a second, i have backed it down to 19 degrees, and i am fine, i just have never seen a car not be able to take more than 19 at redline, this seems like maybe it has something to with why i cant get my g/sec any higher than 250 even though i am making like 300whp
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05-20-2009, 12:52 AM | #5 |
Scooby Guru
Member#: 173241
Join Date: Feb 2008
Chapter/Region:
TXIC
Location: Houston, Tx
Vehicle:2002 s256 twinscroll now with one more gear |
log
here is a log, i have since pulled 1 degree of timing and now its alot better, but i just dont understand why i cant make more power
Code:
Time EL rpm FKC FLKC IAM timing Absolute Pressure Relative Pressure g/sec WGDC Target Boost TDC 0 0.43 1911 0 0 16 41 7.66 -7.5 14.31 92.94 -1.35 9.05 219 0.99 1979 0 0 16 27.5 14.93 0.14 33.21 93.73 15.37 9.05 422 1.02 1980 0 0 16 28 15.28 0.46 34.39 96.47 16.24 9.05 625 1.03 2029 0 0 16 28 15.64 0.81 34.75 96.47 16.67 9.05 860 1.05 2062 0 0 16 27.5 15.99 1.2 35.97 96.47 16.78 9.05 1063 1.07 2115 0 0 16 27 16.38 1.57 38.99 96.47 17.15 9.05 1281 1.09 2196 0 0 16 27 16.71 1.91 39.8 96.47 17.33 9.05 1485 1.11 2236 0 0 16 26 17 2.19 41.43 96.47 17.54 9.05 1703 1.12 2285 0 0 16 26 17.23 2.4 43.79 96.47 17.69 9.05 1922 1.15 2346 0 0 16 25.5 17.52 2.73 45.5 96.47 18.06 9.05 2125 1.17 2438 0 0 16 24.5 17.93 3.09 47.58 96.47 18.2 9.05 2344 1.2 2497 0 0 16 23.5 18.25 3.44 50.13 96.47 18.45 9.05 2563 1.22 2554 0 0 16 23 18.6 3.79 52.32 96.47 18.78 9.05 2766 1.25 2616 0 0 16 22.5 18.95 4.14 55.7 96.47 19.03 9.05 2969 1.28 2695 0 0 16 22.5 19.32 4.51 57.98 96.47 19.34 9.05 3188 1.3 2759 0 0 16 22.5 19.65 4.85 59 96.47 19.59 9.05 3391 1.34 2821 0 0 16 22.5 20.01 5.2 63.46 96.47 19.84 9.05 3594 1.38 2883 0 0 16 22.5 20.4 5.59 67.38 96.47 20.13 9.05 3813 1.41 2939 0 0 16 22.5 20.81 6.01 69.92 96.47 20.36 9.05 4031 1.44 3046 0 0 16 22 21.27 6.46 73.28 96.08 20.79 9.05 4219 1.47 3112 0 0 16 21 21.81 6.98 77.94 95.29 21.08 9.05 4438 1.51 3212 0 0 16 21 22.45 7.6 81.73 94.12 21.54 9.05 4672 1.56 3272 0 0 16 20 23.11 8.28 86.12 93.33 21.83 9.05 4875 1.62 3337 0 0 16 20 23.9 9.07 92.84 92.55 22.43 9.05 5094 1.69 3462 0 0 16 19.5 24.71 9.84 99.24 90.98 22.82 9.05 5297 1.76 3583 0 0 16 19 25.68 10.73 106.23 89.8 22.88 9.05 5516 1.85 3642 0 0 16 18 26.72 11.81 114.3 87.84 22.84 9.05 5735 1.94 3743 0 0 16 17.5 27.88 12.97 122.73 85.88 22.8 9.05 5953 2.04 3880 0 0 16 16.5 29.31 14.37 132.71 82.75 22.76 9.05 6172 2.14 3983 0 0 16 16 30.9 15.88 147.82 80.39 22.72 9.05 6391 2.25 4114 0 0 16 15 32.39 17.4 156.91 78.82 22.7 9.05 6610 2.33 4298 0 0 16 15 33.67 18.68 165.65 77.65 22.66 9.05 6813 2.41 4378 0 0 16 15 34.77 19.8 178.68 76.86 22.64 7.86 7031 2.46 4518 0 0 14 13 35.87 20.85 190.92 76.08 22.6 5.65 7250 2.5 4609 0 0 14 13 36.76 21.79 201.4 75.29 22.59 3.93 7469 2.53 4762 0 0 15 14 37.11 22.35 205.32 74.12 22.57 0 7688 2.53 4903 0 0 15 14 37.3 22.47 213.13 73.73 22.47 -0.11 7875 2.56 5052 0 0 15 13.5 37.26 22.39 217.14 73.33 22.43 -0.07 8094 2.57 5190 0 0 15 13.5 37.03 22.22 224.17 72.55 22.35 -0.04 8313 2.54 5399 0 0 15 14 36.78 22.06 226.26 72.16 22.3 0 8531 2.52 5470 0 0 15 14 36.72 21.99 230.01 71.37 22.22 0 8750 2.48 5572 0 0 15 14 36.62 21.87 233.56 70.98 22.14 0 8953 2.45 5734 0 -1.05 15 13.5 36.45 21.75 236.99 70.59 22.1 0 9172 2.39 5914 0 -1.05 15 13.5 36.18 21.6 232.32 70.59 22.06 2.96 9391 2.38 5957 0 -1.05 15 14 36.12 21.48 238.28 70.59 22.01 2.96 9594 2.35 6082 0 -1.05 15 14 36.01 21.21 238.72 70.59 21.93 2.89 9813 2.33 6266 -2.11 -1.05 15 13 36.04 21.27 242.61 70.59 21.89 2.96 10016 2.31 6313 -2.11 -1.05 15 13.5 35.91 21.17 241.75 70.59 21.83 3.33 10235 2.28 6372 -2.11 0 15 14.5 35.91 21.08 244.78 70.2 21.79 2.89 10453 2.25 6544 -2.11 0 15 15.5 35.97 21.17 244.78 70.2 21.77 3.63 10656 2.23 6614 -2.11 0 15 15.5 35.89 21.25 244.35 70.2 21.7 2.67 10875 2.19 6738 -2.11 0 15 16.5 35.93 21.27 244.35 70.2 21.68 2.96 11094 2.14 6787 -2.11 0 15 17 35.93 21.25 243.92 70.2 21.52 0 11297 2.12 6906 -2.11 0 15 17.5 36.12 21.35 245.21 70.2 21.5 0 11516 2.09 6919 -2.11 0 15 17.5 36.08 21.39 243.92 69.8 21.41 0 11735 2.07 7036 -2.11 0 15 18 36.1 21.48 244.56 68.63 21.15 -0.58 |
05-20-2009, 12:53 AM | #6 |
Scooby Guru
Member#: 173241
Join Date: Feb 2008
Chapter/Region:
TXIC
Location: Houston, Tx
Vehicle:2002 s256 twinscroll now with one more gear |
not sure if i can post a map of even how, but if someone wants to see it i can email it to you
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05-20-2009, 10:37 AM | #7 |
Scooby Guru
Member#: 51961
Join Date: Jan 2004
Chapter/Region:
RMIC
Location: Broomfield, CO
Vehicle:2005 STi 2012 WRX |
Do you have a wideband? You could be leaning out as others have said
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05-20-2009, 05:37 PM | #8 |
Scooby Guru
Member#: 173241
Join Date: Feb 2008
Chapter/Region:
TXIC
Location: Houston, Tx
Vehicle:2002 s256 twinscroll now with one more gear |
actually i had an innovative, and had a problem with them and they wouldnt fix it so i just recently got rid of it, i will be buying an aem in the next month or so, i am actually looking and this guy with a pe1820, pretty much closest turbo to it, is making pretty much the same power, and he can only run 19 degrees timing, also, i wonder if its something to do with the turbo setup in general, i can run more boost and i am fine, just not more timing.
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05-20-2009, 06:11 PM | #9 |
Scooby Specialist
Member#: 68448
Join Date: Aug 2004
Chapter/Region:
NWIC
Location: Ellensburg, WA
Vehicle:2008 WRX STi Cobb tunned by Surgeline |
Just a question but will moded stock injectors support a 20G under heavy timing? Is the duty cycle maxed for stock injectors with that turbo setup?
Just a question as I have not delt much with moded injectors. |
05-20-2009, 07:24 PM | #10 |
Scooby Guru
Member#: 173241
Join Date: Feb 2008
Chapter/Region:
TXIC
Location: Houston, Tx
Vehicle:2002 s256 twinscroll now with one more gear |
well i am actually only at like 60-65%, so i dont think they are a problem, now it could be that they dont have a great spray pattern so it doesnt atomize as good as others, but i dont know, its a vf37 with a 20g wheel
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05-24-2009, 12:37 PM | #11 | |
Scooby Specialist
Member#: 164830
Join Date: Nov 2007
Chapter/Region:
SCIC
Location: San Diego
Vehicle:2002 WRX G61 III OVE 58e |
Quote:
I don't have a 20G, but on my 16G EVOIII my IDC's are no higher than 48-50% on my modded stockers. Upgraded fuel pump is a must as well. |
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05-25-2009, 02:16 AM | #12 |
Scooby Specialist
Member#: 85905
Join Date: Apr 2005
Chapter/Region:
Tri-State
Location: Staten Island
Vehicle:2004 WRX |
Ill chime in since Im the 1820 owner that you are refering too,
I seem to be limited to about 19 degrees uptop because I choose to run higher amounts of boost up top, rather than increase the timing. Its a balancing act. |
05-25-2009, 02:26 AM | #13 |
Scooby Newbie
Member#: 192861
Join Date: Oct 2008
Chapter/Region:
Tri-State
Location: PA
Vehicle:2011 WRX SWP |
what engine management are you using? RomRaider Cobb AP? Pro-tune OS?
Also Id look into getting a WB if you don't already have one, that would definitely tell you exactly where your at. A/F wise. |
06-02-2009, 12:51 AM | #14 |
Scooby Guru
Member#: 58670
Join Date: Apr 2004
Chapter/Region:
MAIC
Location: Behind the scope
Vehicle:2005 got muuuuu? |
did you figure out your issue?
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06-02-2009, 01:13 AM | #15 |
Scooby Guru
Member#: 173241
Join Date: Feb 2008
Chapter/Region:
TXIC
Location: Houston, Tx
Vehicle:2002 s256 twinscroll now with one more gear |
well i put a short ram on, and an sti intercooler, and i can push 20degrees timing, i have pretty much given up, i am now starting to build my JDM Ver8 207 and i will start all over with that one
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06-02-2009, 03:51 PM | #16 |
Scooby Newbie
Member#: 192861
Join Date: Oct 2008
Chapter/Region:
Tri-State
Location: PA
Vehicle:2011 WRX SWP |
sounds good.
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