venom Posted September 3, 2013 Report Share Posted September 3, 2013 My '08 only has about 3500 on the clock right now. I bought it brand new and initially had a Stainless works custom exhaust added (stock headers, 2.5 OR-X with 2.5" S-tube muffler catback - very aggresive and free flowing). When I added the exhaust I bought an XCAL-3 and tune for just for this exhaust from Lund. The new tune really ripped over stock and I felt "seat of the pant's" increase although I lost a bit of boost most likely from the loss of back pressure on the free flowing exhaust. It seems that boost would only pull about 5psi but the car really ran well. So I recently added the JLT Carbon Fiber Big Air (127mm) kit and got an updated tune from Lund. The initial tune hung the RPMs really bad and I reported back to Lund. Got another update to the tune and loaded it. Now the car shows more boost when I go full throttle (back to around 8psi) but overall it seems that it doesn't run as good. Car seems to stumble a bit in first and second gear and just doesn't seem to sit, squat and take off like the initial tune. I am told from Lund that there is nothing wrong with the tune and hundreds are running it. I guess I'm at a loss and a little frustrated. Any suggestions on why it doesn't appear to be as responsive as the initial tune? I don't suspect my plugs as the mileage is low and I am told I don't have to run colder plugs (NGK TR6) until I run more boost, so being at stock 8psi boost range should be fine. Does anyone have a different tune (VMP or other) with similar mods that they could send me to try out? Advice, opinions appreciated Quote Link to comment Share on other sites More sharing options...
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