" Hi everyone, first post here, new to this car. Yes I did a search, I haven't been under a forum rock for the last decade.
I have an 08 335xi sedan. JB4, DCI, 3" VRSF pipes and the VRSF DP fix. I've been running the car with the stock pipes since November with the JB4 and I average 18.5mpg around town on pump gas on tune #1
. Sometimes I play around with e85 and tune 5, but then I've only seen MPGs dip to 17.9 or so.
2 weeks ago I had the 3" VRSF pipes installed and I installed the DP fix a few days later when the CEL came on (surprised me it took that long). It's currently set at "5 o'clock" and the code was cleared using the JB4. The CEL hasn't come back and I do NOT have it set to auto clear, so I 'think' it's set right.
Now, my MPGs are around 14 or 14.5 if I baby it. I honestly expected an MPG increase with the new pipes, or at least things to stay the same. This large change has me surprised. I'm curious if I maybe need to use a different tune on the JB4 or if I perhaps need to turn 'up' or 'down' the DP fix? Maybe the DP fix makes it run really rich? I did a search but couldn't really find much, it's hard to search short words on the forums as I'm sure we all have experienced.
Thanks all! Great site (and I can even get to it at work) "