Quote:
Originally Posted by hackish
This is true, although many newer vehicles are staying in closed loop much longer. Some of them will stay closed loop for everything but WOT.
I just did some testing on a 1.9l TDI and actually found that the engine was more efficient under higher load with more fuel than factory. Surprised me but I don't tend to tune a lot of Diesels. Sadly, adding fuel sure didn't help the emissions. The HC and particulate readings were sky high  |
That's odd. I've tuned diesels and it's pretty odd for efficiency and PM/HC to both increase (ususally you'll see efficiency & NOx go together). It does happen on occasion, however, if the conditions are just right. Since it's a turbo remember that adding more fuel will alter where you are on the turbo maps. That will change your efficiency as well (maybe good or bad).