Anrosphynx Posted January 13, 2011 Share Posted January 13, 2011 I just added a Magnaflow Catback to my LGT wagon. I had an open source tune done when i did my other mods (downpipe, uppipe, sti mods), so until the CBE was added, i was tuned properly. Do I need to get a new tune specifically for the addition of the CBE? I searched but couldn't find a good answer when one is already tuned then adds the CBE. Link to comment Share on other sites More sharing options...
goneskiian Posted January 14, 2011 Share Posted January 14, 2011 I don't think it will make that much difference. Perhaps one of the folks with more tuning experience will chime in. Cheers! Link to comment Share on other sites More sharing options...
iNVAR Posted January 14, 2011 Share Posted January 14, 2011 Most likely not. The CBE shouldn't affect it much if at all, but it doesn't hurt to datalog and do a couple of 3rd gear pulls to see. Link to comment Share on other sites More sharing options...
subie3429 Posted January 14, 2011 Share Posted January 14, 2011 ^+1 I would get a couple logs just to make sure everything is ok, better to be safe than sorry. Link to comment Share on other sites More sharing options...
Anrosphynx Posted January 14, 2011 Author Share Posted January 14, 2011 yeah, the thing that weirds me out is that i have dropped 2-3mpg since i put it on. Doesn't seem normal to me. Link to comment Share on other sites More sharing options...
iNVAR Posted January 14, 2011 Share Posted January 14, 2011 How recent? Gas might've changed for the winter. Link to comment Share on other sites More sharing options...
Anrosphynx Posted January 14, 2011 Author Share Posted January 14, 2011 one week. I was averaging about 20-21mpg before i put on the exhaust. Since, its been around 17mpg. Im even driving more conservatively. Link to comment Share on other sites More sharing options...
iNVAR Posted January 14, 2011 Share Posted January 14, 2011 when's the last time you filled up on gas? Link to comment Share on other sites More sharing options...
Anrosphynx Posted January 14, 2011 Author Share Posted January 14, 2011 Yesterday eve. I drive 70 miles a day. Link to comment Share on other sites More sharing options...
iNVAR Posted January 14, 2011 Share Posted January 14, 2011 And the last time you filled up before that? Your mileage really shouldn't be affected by the CBE, hmm. Link to comment Share on other sites More sharing options...
Anrosphynx Posted January 14, 2011 Author Share Posted January 14, 2011 two days before that. I usually fill 2-3 times a week. The last two fillups I have been averaging about 17.4mpg, when normally i am at about 20-21mpg. The other thing i have noticed is that idle drops (when not on the gas) unusually low, almost like it wants to stall, but never does. Not enough backpressure? Link to comment Share on other sites More sharing options...
iNVAR Posted January 14, 2011 Share Posted January 14, 2011 Well, do some datalogs and see if anything's fishy... Are you sure your foot isn't just heavier? Trying to enjoy the new exhaust sound? Link to comment Share on other sites More sharing options...
RedDawg Posted January 14, 2011 Share Posted January 14, 2011 i wouldnt be suprised if you're just sub-consciously blipping the throttle more to hear the exhaust lol Link to comment Share on other sites More sharing options...
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