Deer Killer Posted November 28, 2011 Share Posted November 28, 2011 Is this the general experience? I see everyone says that a panel filter affects the MAF curve but I haven't seen any comments on the trend. If this is true I suppose you could use the average of the A/F learning to estimate how dirty the filter is? Link to comment Share on other sites More sharing options...
Max Capacity Posted November 29, 2011 Share Posted November 29, 2011 I think it's easier to remove the filter and check it. If it's dirty replace it, or wash it and re-oil. Make sure your MAF and IAT sensors are clean too. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
bnguyenbb6 Posted November 29, 2011 Share Posted November 29, 2011 You have compensation tables that should take in account for old filters, weather etc. Link to comment Share on other sites More sharing options...
Deer Killer Posted November 29, 2011 Author Share Posted November 29, 2011 Right, I understand how and why the ECU compensates with AF learning and I can clean the filter twice a day if I want. I was more interested in physical effects of more vs less restrictive panel filter on MAF operation. I assume this is because the MAF sensor is operating under increased and unmeasured/uncompensated vacuum. I don't see how this would make an aftermarket panel filter run lean, but this seems to be what I see on the forums. This is kind of important if you want to disregard all the safety margins in the stock tune and run an aggressive tune. Link to comment Share on other sites More sharing options...
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