McDowell Performance Tunin Posted July 29, 2014 Share Posted July 29, 2014 .028-.031" for the LGT www.facebook.com/mcdowelltuning [sIGPIC][/sIGPIC] Click Here for Stage1, Stage2 and Stage3 Tuning and eTuning Info Link to comment Share on other sites More sharing options...
McDowell Performance Tunin Posted July 29, 2014 Share Posted July 29, 2014 .039-.043" for the 3.6R and 2.5i www.facebook.com/mcdowelltuning [sIGPIC][/sIGPIC] Click Here for Stage1, Stage2 and Stage3 Tuning and eTuning Info Link to comment Share on other sites More sharing options...
fredrik94087 Posted July 29, 2014 Author Share Posted July 29, 2014 .039-.043" for the 3.6R and 2.5i Thank you...added to first page! "It's within spec" - SOA "Depth is only shallowness viewed from the side." - Fredism "So, how much did it cost for your car to be undriveable ." - Stephen (very close friend) "You have done so much it would be stupid to go back." - Sunny of Guru Electronics 2018Q50RS | 2015WrxThread | Shrek Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 29, 2014 Share Posted July 29, 2014 Would it be a bad idea to change the gap to gt specs? Link to comment Share on other sites More sharing options...
GTEASER Posted July 29, 2014 Share Posted July 29, 2014 Yes. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 29, 2014 Share Posted July 29, 2014 Why? What changes? Even if I had it tuned to that gap? Just curious Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 29, 2014 Share Posted July 29, 2014 I just installed new ngk plugs 3 months ago would it be ok if I pulled them out to check the gap or should I replace them if I pull them out? I'm trying to figure out my knock problem. It's been there since I was on stock Rom. Link to comment Share on other sites More sharing options...
McDowell Performance Tunin Posted July 29, 2014 Share Posted July 29, 2014 The gap is smaller on the turbo because of higher cylinder pressure, from forced induction. If you gapped your N/A car the same way, you're going to cause pre detonation in your cylinder head. If our plugs had the same sized gap as the N/A engines, it would cause spark blow back. Unless you've boosted your N/A car, use the plugs and gap spacing designed for your car. Without a super/turbo charged engine (or nitrous), or major engine work, you won't have the necessary cylinder pressure to gap your plugs the same way. The 3.6 without forced induction should stay within the specified gap range. www.facebook.com/mcdowelltuning [sIGPIC][/sIGPIC] Click Here for Stage1, Stage2 and Stage3 Tuning and eTuning Info Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 29, 2014 Share Posted July 29, 2014 So if I'm producing -2.75 knock at about 4000rpms on load what do you think would cause it? Fyi I was producing knock on stock Rom as well and I'm running 93 octane Exxon gas. Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 29, 2014 Share Posted July 29, 2014 Hmm, I just did a run and didn't have any knock. I changed the gaskets on the exhaust manifold today thinking that was the problem but the run I did afterwards still knocked. I wonder if it was learned knock and the gaskets fixed it. Ill do more runs and see Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 29, 2014 Share Posted July 29, 2014 The gap is smaller on the turbo because of higher cylinder pressure, from forced induction. If you gapped your N/A car the same way, you're going to cause pre detonation in your cylinder head. If our plugs had the same sized gap as the N/A engines, it would cause spark blow back. Unless you've boosted your N/A car, use the plugs and gap spacing designed for your car. Without a super/turbo charged engine (or nitrous), or major engine work, you won't have the necessary cylinder pressure to gap your plugs the same way. The 3.6 without forced induction should stay within the specified gap range. Had anyone played around with this? It sounds like we have a acceptable range of .006 would we be able to tune for more power at .039 vs .045? I might play around with it at least using the accepted ranges. Link to comment Share on other sites More sharing options...
GTEASER Posted July 29, 2014 Share Posted July 29, 2014 Hmm, I just did a run and didn't have any knock. I changed the gaskets on the exhaust manifold today thinking that was the problem but the run I did afterwards still knocked. I wonder if it was learned knock and the gaskets fixed it. Ill do more runs and see Did you reset your ECU after the install? GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 29, 2014 Share Posted July 29, 2014 Did you reset your ECU after the install? No, I just did on Friday so I didn't think It would be a big deal if I didn't. Should I if knock learning is showing 0 across the board? Link to comment Share on other sites More sharing options...
McDowell Performance Tunin Posted July 29, 2014 Share Posted July 29, 2014 Was your battery disconnected? It will also reset the ECU. www.facebook.com/mcdowelltuning [sIGPIC][/sIGPIC] Click Here for Stage1, Stage2 and Stage3 Tuning and eTuning Info Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 29, 2014 Share Posted July 29, 2014 No Link to comment Share on other sites More sharing options...
west_minist Posted July 31, 2014 Share Posted July 31, 2014 Matt, what is the recommended spark gap for the 3.6R? Previous 3R were in the range if 0.7-0.8mm. Link to comment Share on other sites More sharing options...
west_minist Posted July 31, 2014 Share Posted July 31, 2014 Here were I am, maintenance schedule is like 4800+km. So plugs are changed that often and we found with Iridiums, usually go off after the first month and normal performance for the next 2 months. Regress over the next few months. Using Copper, it fix well into the oil maintenance of 4800+ or 3months. You just cannot take plugs out a box and put them in. There are needed to be check for gapping. Some gapping are usually more than 0.9mm. Link to comment Share on other sites More sharing options...
west_minist Posted July 31, 2014 Share Posted July 31, 2014 Understood. That implies, just check Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 31, 2014 Share Posted July 31, 2014 (edited) .8mm = .031", why does NGK's website say it's .044"? Also it says .044 on the 3.0 legacy as well. Edited July 31, 2014 by stevenc1703 Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 31, 2014 Share Posted July 31, 2014 Apparently I still have the factory NGK's, I thought I threw them out but I guess not. Thank God I'm lazy. Lolhttp://img.tapatalk.com/d/14/07/31/3evyjypa.jpghttp://img.tapatalk.com/d/14/07/31/uhagyje6.jpghttp://img.tapatalk.com/d/14/07/31/arynujeb.jpg Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 31, 2014 Share Posted July 31, 2014 There was one that was off unless I bumped it which is quite possible but the rest were right at .044http://img.tapatalk.com/d/14/07/31/9ugu6ymu.jpg Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 31, 2014 Share Posted July 31, 2014 11 is 1.1mm so seems 3.6 might have larger gap. Ones I have pulled out have been 0.8mm BUT they have been dealer serviced. Where are you located? Maybe due to America's crazy cries for gas mileage they opened the gap on USA models but the power loving people where you live got tighter gaps. Lol Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 31, 2014 Share Posted July 31, 2014 Yea that's probably it then. Ill gap them this weekend. Link to comment Share on other sites More sharing options...
west_minist Posted July 31, 2014 Share Posted July 31, 2014 But do you have a service manual for the 3.6R Steven? Please remember the quality of the Gas is very important. We all will be patiently waiting on your feedback. I had my coppers in for about 6months. Started off I think at either .7 or .8mm. When I changed them, there were 1+mm Link to comment Share on other sites More sharing options...
stevenc1703 Posted July 31, 2014 Share Posted July 31, 2014 Maybe not then lol Link to comment Share on other sites More sharing options...
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