2008 BMW 135i: Testing The DME Tune Reflash
May 25, 2009
(this photo doesn't have anything to do with the words below; I just dig the image)
Before and after. That's how we test the cars in our longterm fleet. We test them when they first arrive, and then we re-test after we've driven them for about a year.
As our longterm 2008 BMW 135i is nearing the end of its stay with us, a few weeks ago we performed the "after" testing. Our 135i produced the following acceleration performance after its year with us:
Stock 0-60--5.1 seconds (4.8 seconds with one foot of rollout like on a drag strip)
Stock 1/4 mile--13.4 seconds at 103.4 mph
Even more recently, we had DME Tune reflash our 135i. Do the nature of the space-time continuum, we had to test it at an even later date. We would have preferred to test both configurations (stock vs reflash) on the same day but Einstein frowns upon universe tinkering.
Click the jump to see the result of the DME Tune reflash.
DME Tune 0-60--4.9 seconds (4.6 seconds with one foot of rollout like on a drag strip)
DME Tune 1/4 mile--13.2 seconds at 105.1 mph
Thus, the reflash sliced 0.2 seconds off its acceleration time and bumped up the trap speed by almost 2 mph.
Not bad, but it sure feels a lot quicker than those results indicate. Indeed, the midrange punch of the DME Tune reflash is substantial.
When we're running through the gears during an acceleration run, though, we only see the midrange once. In every gear outside of first gear, the engine is operating around peak power and redline.
It could be that the DME Tune reflash is relatively conservative at higher engine speeds relative to what it delivers at lower engine speeds. Just a guess.
Jason Kavanagh, Engineering Editor