Quote:
Originally Posted by ffrcobra_65
LS3 normally make an exhaust popping and gurling sound during deceleration and the sound becomes even more noticeable and louder with an exhaust mod. I happen to like the noise but others find it annoying. The popping is caused by the DFCO (deceleration fuel cut off) and is a stock feature of the LS3 (maybe L99 as well?). Other than for sound suppresion, what are the benefits of tuning out the popping?
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Noise is pretty much the only reason. It's usually also tuned out when logging during the tuning process just to get better feedback from the engine, but usually DFCO is turned back on after tuning is done.
Quote:
Originally Posted by Edrock
This is just a guess...but wouldn't tuning out the decel pop mean fuel would continue to flow during decel, therefore, no more popping? If this is the case, then the downside to tuning it out would be a tad bit worse gas mileage, correct?  That's about the only negative I can think of. |
you are correct, slightly worse gas mileage. I lost about 1.5 or 2mpg when I tuned it out. however, there is a way to adjust the DFCO parameters so that it cuts the fuel on decel without popping (agressive parameters), but determining those values can be time consuming.
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2010 1SS/RS - CGM/Gray Interior - M6 (SOLD) Kooks 1 7/8" headers, Solo Mach-X, Vararam.
2012 2LS - Black A6 (SOLD)
2016 1SS Summit White A8