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Old 01-19-2006, 04:55 PM   #1
boundy3
Scooby Specialist
 
Member#: 54598
Join Date: Feb 2004
Chapter/Region: South East
Location: Orlando
Vehicle:
2004 WRX Sedan
WR Blue Pearl #68 STX

Default -KC values at low throttle/rpm

I just went and took some logs and I got 3 long strands of -KC values similar to what I posted during one 15 minute drive. They all seem to happen at low throttle (8-15%) low RPM cruises. IAM stayed steady at 16.

Anything to worry about? Could it be detonation, or I read somwhere that it may be piston slap or a heatshield rattle?

I never/rarely get any -KC values when I'm on boost, usually only in vaccum.

2004 WRX running AP Stage 1 93 oct, stock otherwise relating to motor/exhaust. Dataloged using ECUExplorer.

Any ideas would be appreciated.

Thanks


Code:
(Time)(RPM)(Cool Temp)(Throttle)(MassAF)(Intake)(Ignit.)(Speed)(KC)  (ID%)   (MRP)(WDC %)(FuelPump)(AF Sensor)(Defog)  (EGT) (IAM)    
467828	2011	185.00	11.37	21.89	77.00	36	51	0	7.72	-3.627	0.00	33.33	14.59	1	1184.00	16
468031	2019	185.00	11.37	21.38	77.00	37	51	0	7.75	-3.773	0.00	33.33	14.47	1	1184.00	16
468234	2039	185.00	10.98	21.29	77.00	37	52	0	7.83	-3.773	0.00	33.33	14.47	1	1184.00	16
468437	2042	185.00	10.20	20.18	77.00	37	52	0	7.41	-4.063	0.00	33.33	14.47	1	1184.00	16
468640	2031	185.00	9.41	18.82	77.00	37	52	0	6.93	-4.643	0.00	33.33	14.36	1	1175.00	16
468843	2048	185.00	9.41	18.37	77.00	36	52	-2	6.99	-4.933	0.00	33.33	14.47	1	1175.00	16
469047	2054	185.00	9.02	18.29	77.00	36	52	-2	6.57	-5.224	0.00	33.33	14.47	1	1175.00	16
469250	2032	185.00	9.02	17.23	77.00	36	52	-2	6.50	-5.369	0.00	33.33	14.59	1	1175.00	16
469453	2036	185.00	8.63	17.45	77.00	36	52	-2	6.52	-5.514	0.00	33.33	14.47	1	1175.00	16
469656	2054	185.00	8.63	17.08	77.00	36	52	-2	6.13	-5.659	0.00	33.33	14.47	1	1175.00	16
469859	2041	185.00	8.24	16.81	77.00	38	52	-2	6.10	-5.804	0.00	33.33	14.59	1	1175.00	16
470062	2037	185.00	8.24	16.53	77.00	38	52	-2	6.08	-5.949	0.00	33.33	14.59	1	1175.00	16
470265	2055	185.00	8.24	16.47	77.00	38	52	-2	6.14	-5.949	0.00	33.33	14.59	1	1175.00	16
470468	2056	185.00	8.24	16.74	77.00	38	52	-2	6.14	-5.949	0.00	33.33	14.59	1	1175.00	16
470672	2059	185.00	8.63	16.87	77.00	38	52	-2	6.15	-5.949	0.00	33.33	14.70	1	1175.00	16
470875	2044	185.00	8.63	16.74	77.00	38	52	-2	6.10	-5.949	0.00	33.33	14.70	1	1175.00	16
471078	2062	185.00	8.63	16.94	77.00	38	52	-2	6.16	-5.804	0.00	33.33	14.70	1	1175.00	16
471281	2060	185.00	8.63	17.15	77.00	36	52	-2	6.15	-5.949	0.00	33.33	14.47	1	1175.00	16
471484	2042	185.00	8.63	16.81	77.00	38	52	-2	6.10	-5.949	0.00	33.33	14.36	1	1175.00	16
471687	2042	185.00	8.63	16.67	77.00	38	52	-2	6.10	-5.804	0.00	33.33	14.59	1	1166.00	16
471890	2063	185.00	8.63	17.15	77.00	38	52	-2	6.16	-5.949	0.00	33.33	14.59	1	1166.00	16
472093	2061	185.00	8.63	17.01	77.00	38	52	-2	6.15	-5.949	0.00	33.33	14.70	1	1166.00	16
472312	2063	185.00	8.63	17.15	77.00	36	52	-2	6.16	-5.804	0.00	33.33	14.59	1	1166.00	16
472515	2051	185.00	8.63	17.22	77.00	36	52	-2	6.13	-5.804	0.00	33.33	14.59	1	1166.00	16
472718	2046	185.00	8.63	17.30	77.00	36	52	-2	6.11	-5.804	0.00	33.33	14.59	1	1166.00	16
472922	2069	185.00	9.02	16.94	77.00	36	52	-2	6.18	-5.804	0.00	33.33	14.59	1	1166.00	16
473125	2070	183.20	9.02	17.45	77.00	36	52	-2	6.62	-5.804	0.00	33.33	14.70	1	1166.00	16
473328	2050	183.20	9.02	17.60	77.00	36	52	-2	6.56	-5.659	0.00	33.33	14.59	1	1166.00	16
473531	2052	183.20	9.02	17.75	77.00	36	52	-2	6.57	-5.659	0.00	33.33	14.70	1	1166.00	16
473734	2071	183.20	9.02	17.68	77.00	36	52	-2	6.63	-5.659	0.00	33.33	14.59	1	1166.00	16
473937	2075	183.20	9.02	17.75	77.00	36	52	-2	6.64	-5.514	0.00	33.33	14.47	1	1166.00	16
474140	2073	183.20	9.02	17.68	77.00	36	52	-2	6.63	-5.514	0.00	33.33	14.59	1	1166.00	16
474343	2058	183.20	9.02	17.68	77.00	36	53	-2	6.59	-5.514	0.00	33.33	14.59	1	1166.00	16
474547	2061	183.20	9.02	17.75	77.00	36	53	-2	6.59	-5.514	0.00	33.33	14.59	1	1166.00	16
474750	2078	183.20	9.02	17.83	77.00	36	53	-2	6.65	-5.659	0.00	33.33	14.47	1	1166.00	16
474953	2084	183.20	9.02	17.30	77.00	36	53	-2	6.67	-5.659	0.00	33.33	14.59	1	1166.00	16
475156	2067	183.20	9.02	17.91	77.00	36	53	-2	6.61	-5.659	0.00	33.33	14.70	1	1166.00	16
475359	2067	183.20	9.02	17.45	77.00	36	53	-2	6.61	-5.659	0.00	33.33	14.59	1	1166.00	16
475562	2071	183.20	9.02	17.60	77.00	36	53	-2	6.63	-5.659	0.00	33.33	14.59	1	1166.00	16
475765	2090	183.20	9.02	17.30	77.00	36	53	-2	6.69	-5.659	0.00	33.33	14.59	1	1166.00	16
475968	2071	183.20	7.84	16.06	77.00	39	53	0	6.19	-6.094	0.00	33.33	14.59	1	1166.00	16
476172	2091	183.20	7.45	15.44	77.00	40	53	0	5.80	-6.529	0.00	33.33	14.36	1	1166.00	16
476375	2087	183.20	7.45	15.24	77.00	40	53	0	5.79	-6.675	0.00	33.33	14.36	1	1166.00	16
476578	2070	183.20	7.45	15.17	77.00	40	53	0	5.74	-6.675	0.00	33.33	14.59	1	1166.00	16
476781	2071	183.20	7.45	14.85	77.00	40	53	0	5.74	-6.820	0.00	33.33	14.70	1	1166.00	16
476984	2070	183.20	7.45	15.44	77.00	40	53	0	5.74	-6.820	0.00	33.33	14.70	1	1166.00	16
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Old 01-20-2006, 11:48 AM   #2
Jeramie
Scooby Newbie
 
Member#: 56995
Join Date: Mar 2004
Chapter/Region: MAIC
Location: PA
Vehicle:
2004 WRX
Blue

Wink

I've been told by others this is just engine noise. But I'm not expert. As long as your don't have negative KC values under WOT, it shouldn't be anything to worry about. (Again I'm no expert, just spitting out what I've been told).
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Old 01-20-2006, 12:27 PM   #3
drees
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Member#: 25905
Join Date: Oct 2002
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2003 Silver Wagon
Tuned with Enginuity

Default

Yep, neg KC at light throttle is pretty normal. The ECU shouldn't have much room to advance there, anyway. If IAM is >= 12 and and KC is 5+ under boost, you're probably OK.
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Old 01-20-2006, 04:17 PM   #4
boundy3
Scooby Specialist
 
Member#: 54598
Join Date: Feb 2004
Chapter/Region: South East
Location: Orlando
Vehicle:
2004 WRX Sedan
WR Blue Pearl #68 STX

Default

It was just odd to see such long strands of -KC values like that. I've never seen this before in anybody elses logs.

Car feels fine, and I can't hear any audible knocking.
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Old 01-20-2006, 05:09 PM   #5
Jeramie
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Member#: 56995
Join Date: Mar 2004
Chapter/Region: MAIC
Location: PA
Vehicle:
2004 WRX
Blue

Default

Arn't most other peoples logs at WOT?
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Old 01-20-2006, 09:20 PM   #6
boundy3
Scooby Specialist
 
Member#: 54598
Join Date: Feb 2004
Chapter/Region: South East
Location: Orlando
Vehicle:
2004 WRX Sedan
WR Blue Pearl #68 STX

Default

Yeah most are at WOT, but I've seen a few posted that were also of just normal driving before.
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