Quote:
Originally Posted by tcubed
Here are my thoughts after 6k miles and 4 months. Power is nice, Urea usage in concerning (refill after 2,550 miles on average) MPG is up a little 1-2 mpg. Turbo lag still very present and probably worse in some cases since with more power it comes in stronger, but turbo lag is a plumbing and turbo issue not a tuning issue.
Kerma never posted my review stating the above......
Just wanted others thinking about it to be aware, not sure how this is going to affect DPF and SCR life.
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I've been Kerma-tuned for 6,660mi now and haven't observed a DEF usage nearly as high as yours.
The DEF system (passive plus active tanks) has a capacity of 18.1L. My DEF/1000mi light comes on when I'm at 3L remaining. When the first light came on after the Kerma tune I put in 12L (VW 10L jug + VW 2L bottle). My light came on again after about 5000mi. The next time I decided to completely top off the system to see how much it would take, and got 15L in there before things started spilling out. Thus my DEF consumption rate is ~400mi/L, or 6000mi before the DEF light comes on again.
How much DEF are you putting in when you fill it? BTW my driving during this period also included track time.