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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 03-28-2012, 10:33 PM
JupiterX3 JupiterX3 is offline
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Location: Jupiter, FL
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Mein Auto: 2010 X5///M, SSII
Originally Posted by RSPDiver View Post
So back on topic (and I love the headers talk, vids, and discussion a lot, as I'm thinking of them also), the way many tunes work is by removing safety margins pre-programed by the factory, and maximizing octane requirements while subduing controls like air flow sensors and such until knock sensors kick in.

That said, the dyno charts I would expect from a tune that shows that kind of HP gain, would be a huge spike somewhere, not so much of a broad gain. I would suspect a possible padding of the gains could have been gained by running 89 fuel on the first run, perhaps on a hot engine with no fan, and then good gas (91 or 93 if they have it in Mass) once the engine had cooled. Hell, you could probably even adjust tire pressure to throw results. And environmental factors can be adjusted in some dyno software to throw results. So, in summary, I'd like to see some other results, and think it would be awesome if they could package their tune to be remotely installed to a couple of vehicles that were on a no-risk trial. If it's a 12hp gain with improved throttle response gain, proven on an independent dyno, I'm in all day long. It's just hard to believe that someone has unlocked over 20 hp from a stock M54 engine after about a decade. Not with all the big tuners out there.
Very well said.
2012 X3 35i M Sport /// 2004 330i ZHP

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