GT_NKY Posted January 6, 2009 Share Posted January 6, 2009 Tuning wizards, please help me to figure out negative knock learning readings. ‘08 LGT 5MT, Cobb AP, Blouch Dom 2.5R, FMIC, Proddrive EBC, DW 750cc, BigMAF, and few other mods. Heavy duty ACT clutch and light flywheel were installed not long ago. Known Mechanical Problems: - Extremely small rip in the inlet hose. It is taped now. - Either a small boost leak or exhaust leak. Unable to maintain target boost of 19-20psi. - Exhaust rattle (stock cans, XO2 mid & Y) - Step colder spark plugs gapped to .32 The above things will be fixed over the next few weeks. There is no knock under WOT at all. DAM/IAM is 1.0, but it does climb up very slowly after a reset. The knock is detected under lower engine loads, around 20% throttle. Not sure if the knock is real or whether exhaust/fmic/flywheel noise is perceived as knock. Log is below. Thank you! http://www.box.net/shared/cozff83dj2 Link to comment Share on other sites More sharing options...
rao Posted January 6, 2009 Share Posted January 6, 2009 Tuning isn't your problem. Also take that BIG MAF and throw it in the garbage can. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
GT_NKY Posted January 6, 2009 Author Share Posted January 6, 2009 Tuning isn't your problem. Also take that BIG MAF and throw it in the garbage can. lol... too bad it's already scaled for BIG MAF... my tuner also seemed to think that 07+ do better w/ BIG MAF... otherwise, i agree... perrin sucks... never would buy their product again... they are absolutely the worst company out there, and do not stand behind their products… but that’s a whole other story :-) thank you for a quick reply btw Link to comment Share on other sites More sharing options...
testes1010 Posted January 6, 2009 Share Posted January 6, 2009 The knock is detected under lower engine loads, around 20% throttle. Not sure if the knock is real or whether exhaust/fmic/flywheel noise is perceived as knock. Remove timing where knock occurs, if it goes away its knock. If it doesn't its 'noise' from some rattle or flywheel. For the noise many of the STi guys shim the knock sensor with some tape or something to 'cushion' the knock sensor. +1 on Perrin Intakes being absolute garbage. Link to comment Share on other sites More sharing options...
Spec B Posted January 6, 2009 Share Posted January 6, 2009 +1 I happen to have knock/perceived knock in the same region you do, my timing and fueling are the same as stock in that range, so I am not overly concerned about it. Best thing to do is pull timing and see if the knock subsides. Link to comment Share on other sites More sharing options...
GT_NKY Posted January 6, 2009 Author Share Posted January 6, 2009 i used AP feature to adjust timing throughout a map... the timing was retarded by 5 degrees... it seemed that knock correction became less frequent (did not get a chance to log it, observed live data on AP as driving), but still was present… Link to comment Share on other sites More sharing options...
testes1010 Posted January 6, 2009 Share Posted January 6, 2009 the timing was retarded by 5 degrees... thats alot for the knock to exist. Link to comment Share on other sites More sharing options...
Infamous1 Posted January 6, 2009 Share Posted January 6, 2009 Stop logging knock correction, your car is pulling much more timing than that. Log feedback and fine learning correction. Im certain your knock at WOT as well if you are basing knock solely on negative KC. You may need to eventually get a tactrix cable, RomRaider has far more parameters that would be useful to you mainly Knock sum. Not to mention Learning View would be helpful in your situation as well. Link to comment Share on other sites More sharing options...
GT_NKY Posted January 6, 2009 Author Share Posted January 6, 2009 Stop logging knock correction, your car is pulling much more timing than that. Log feedback and fine learning correction. Im certain your knock at WOT as well if you are basing knock solely on negative KC. You may need to eventually get a tactrix cable, RomRaider has far more parameters that would be useful to you mainly Knock sum. Not to mention Learning View would be helpful in your situation as well. i'll try to log via romraider... not sure if a locked ecu (via new AP firmware) can be logged via romraider... right now stuck w/ knock correction only :-( Link to comment Share on other sites More sharing options...
NSFW Posted January 9, 2009 Share Posted January 9, 2009 I'm guessing it's just noise from the knock sensor. Watching knock sum on my 05 LGT with the stock tune showed it incrementing quite often in the sub-2500 RPM and sub-1.0 g/s area. Others have reported the same thing. Link to comment Share on other sites More sharing options...
mickeyd2005 Posted January 9, 2009 Share Posted January 9, 2009 I don't think it's noise. You're trying to run a lot more timing than the stock map plus there are some fueling issues. Link to comment Share on other sites More sharing options...
LittleBlueGT Posted January 10, 2009 Share Posted January 10, 2009 For the noise many of the STi guys shim the knock sensor with some tape or something to 'cushion' the knock sensor. Links to this? I have never seen it before. Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
testes1010 Posted January 10, 2009 Share Posted January 10, 2009 I'm looking for it. Link to comment Share on other sites More sharing options...
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