Quote:
Originally Posted by HAHA
The lag is not really a turbo lag but rather the computer not supplying enough fuel to get things moving. This is done to control the emissions (regulations on diesels are very strict these days). The trim box is able to overcome the lag by injecting more fuel in the beginning of the acceleration phase.
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The ECM not supplying "enough" fuel is most probably due to emissions contraints (probably smoke). Typically smoke comes from too rich of a mixture. Keep in mind that smoke levels from the stock engine are probably seceral times less that the visible smoke range. The chip tuner may actually be increasing smoke quite a bit, but you still might not be able to see anything. Another possiblity is that the chip tuner is advancing the timing to get more power. This probably increases the NOx above the stock level. At the same time it probably lowers the smoke too (more advanced timing generally lowers smoke). That's just my guess..