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08-07-2012, 11:40 AM | #1 |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
False Knock? IAM 16 with fine corrections.
Hey Guys,
I trully think I have false knock. My car is stupid loud (everywhere). To start off with: CP Pistons 8:2:1 Manley I rods Nitrated Crank Manley Valve Springs STI 2.5L LongBlock STI TMIC ATP GT3076R ~14psi Solid drive terrain bushings (rear diff, crossmemeber, rear subframe, motor mounts, tranny mount etc) 3" turbo back FIC 1100cc injectors NGK 1 step colder plugs (iridium) Running 94 octane I had a skid plate on the car for a bit but took it off. Alright so I'm running all this in a 2003 WRX with a WRX ECU, manifold (cable throttle), all WRX harness (so no AVCS, oil line still hooked up though). I have transferred all the STI parameters over that I could to the WRX ecu. Main thing to know is STI base ignition map + advance knock Max map and STI open loop map. The tune is bang on, concerning A/F. Idle/Cruise is 14.5 and WOT is 11.2 @ 14psi. This car loves timing and you can definitely feel the power with stock timing but my ecu thinks it sees knock. So I had everything stock before (timing map wise). Now I removed a solid 4-5 degrees from the Advance Max knock table. The IAM went to 16 as it usually does but fine knock correction is reporting some instances of -7 knock pulled back. This was all before I installed the new sparkplugs and currently I'm at IAM of 12 and I have done some hard pulls without any change. So clearly it doesn't like something. I'm about to install meth and run the stock STI base timing map and Advance map and if it still knocks can I truly say its false? When I had my skid plate on the car IAM was at 0. Thats how loud the plate was (though I never really herd it). My CP pistons are loud and my exhaust has a slight rattle (resonance at 3-4k). I'm thinking this is the issue, not the tune.
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08-07-2012, 06:03 PM | #2 |
Scooby Specialist
Member#: 268354
Join Date: Dec 2010
Chapter/Region:
NESIC
Location: Massachusetts
Vehicle:02 WRX 05 LGT Slow Automatics |
Timing isnt like a power / safety knob. Less timing doesnt always mean safer or less knock. In theory there is one ideal timing for a specific combustion reaction. I assure you a 3076 equipped car has quite different timing than stock.
More evaluation would have to be done to determine if the knock is "false" |
08-07-2012, 09:24 PM | #3 |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
More timing to a certain degree won't be beneficial. Will make less power. A dyno will tell me that. So far IAM is at 16 with zero correction across the board. I think this colder plugs are doing the trick. I'll keep on logging.
The only reason I bring false knock to the equation is because I had an IAM of 0 with the skid plate on. |
08-10-2012, 10:08 AM | #4 |
Scooby Newbie
Member#: 77372
Join Date: Dec 2004
Location: Scotland
Vehicle:2005 Spec C WR Blue |
Have you listened to your engine with detcans?
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08-10-2012, 02:06 PM | #5 |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
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08-23-2012, 03:07 PM | #6 |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
det can made, I did a 5th gear pull and the ecu pulled timing with an IAM of 16. I couldn't hear any marbles in a can sound. So it seems my car is just naturally loud and producing a false knock.
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08-23-2012, 04:23 PM | #7 |
Scooby Newbie
Member#: 77372
Join Date: Dec 2004
Location: Scotland
Vehicle:2005 Spec C WR Blue |
Did it pull timing via FBKC or FLKC?
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08-23-2012, 04:32 PM | #8 |
Scooby Specialist
Member#: 108089
Join Date: Feb 2006
Chapter/Region:
MWSOC
Location: Minnesota
Vehicle:2003 WRX NF Performance |
should tune it properly
and also make sure knock sensor is installed and torqued properly. |
08-23-2012, 09:18 PM | #9 |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
I was checking it out via Learning View so FLKC (which was pulling timing).
Knock sensor is properly installed/pointing in the correct direction. Det can is installed right on top of the knock sensor. On a side note, I have this rattle from underneath the car and I can hear it at 2-4k then it disappears (probably engine noise is to great to listen too after 4k). I hear it without det cans. With the det can I hear what can be described as clanking and the faster I rev the faster it goes, sounds normal to me. |
08-23-2012, 11:26 PM | #10 |
Scooby Specialist
Member#: 323379
Join Date: Jun 2012
Vehicle:1992 Trans Am |
You could always run some race gas and scan for knock. If it stays the same it's false.
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08-24-2012, 06:40 AM | #11 | |
Scooby Newbie
Member#: 77372
Join Date: Dec 2004
Location: Scotland
Vehicle:2005 Spec C WR Blue |
Quote:
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08-24-2012, 01:34 PM | #12 |
Scooby Specialist
Member#: 323379
Join Date: Jun 2012
Vehicle:1992 Trans Am |
I am new to these cars still, but could that be a loose heatshield somewhere? That's a pretty common issue with weird rattling at certain RPMs.
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08-24-2012, 06:36 PM | #13 | |||
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
Quote:
Quote:
Quote:
On a side note, I'm currently running stock 05 STI timing (with some smoothing done to the stock timing map as it was lumpy in some spots) A/F at 11.2-11.7 mid range to redline with Meth @ 18.5psi. Car pulls real nice, no knock. I'll richen it a tad to 11.5 with a little more meth. It was also a pretty hot day Last edited by OC_Nooby; 08-29-2012 at 07:05 PM. |
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08-26-2012, 07:12 PM | #14 |
Scooby Specialist
Member#: 268354
Join Date: Dec 2010
Chapter/Region:
NESIC
Location: Massachusetts
Vehicle:02 WRX 05 LGT Slow Automatics |
Seems like you need to do some more research on how to do a proper timing map.
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08-29-2012, 07:03 PM | #15 |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
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08-29-2012, 08:31 PM | #16 |
Scooby Specialist
Member#: 268354
Join Date: Dec 2010
Chapter/Region:
NESIC
Location: Massachusetts
Vehicle:02 WRX 05 LGT Slow Automatics |
Making a proper timing map will get you more power, and playing around with it will help you determine more where the car likes/dislikes timing and different trends.
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08-29-2012, 11:03 PM | #17 | |
Scooby Specialist
Member#: 311781
Join Date: Feb 2012
Location: Canada
Vehicle:2003 WRX w STI V8 |
Quote:
I'll be sharing my map on RomRaider and hopefully people can critique it once I'm done with it. Help me smooth it out if need be. |
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