Quote:
Originally Posted by chmura
N55 I believe is not meant for stage one until you upgrade the fuel pump. There are a few companies that have kits for this. You most likely had some detention for loss of fuel pressure.
There was a thread in the F80 M3 forums that a bmw tech posted a picture of BMW ISTA software auto detecting a BM3 tune. Not sure why it got mysteriously deleted. It makes it look like this forum is shady to protect the vendor to make more $$$ for sponserships. Its a shame.
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BM3 Stage 1 does not require a fuel pump. It gives modest gains but still relies on the DME's ability to pull timing when needed in high load/high temp situations. Stage 2 in colder weather will cause issues at high load on stock pump.
I saw that ISTA blurb reposted in reddit. I can believe it.