Quote:
Originally Posted by t vago
Besides that, hard acceleration is bad in some OBDII vehicles because those vehicles' engine computers will go into open loop and perform enrichment of the fuel/air mix to the point where you'll see AFRs of 12:1 or even 11.5:1 (like my truck, for instance). Fuel economy goes right out the window, even if you wouldn't have to brake hard.
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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
