Originally Posted by ward
I bet you won't see much of a gain until the software is optimized for the throttle body/intake/exhaust you've got
I was talking to Mike at Technik, and to some members who fiddled a bit with different ECU reflashes. Our cars do have some ability to adapt to our driving habits and hardware, and in no small part, the air/fuel mixture. None of the companies are placing any high priority (if any) on ECU upgrades for the outgoing E90 N52 models.
Originally Posted by Chesmu
3mm lets that much more in? I'll repeat Hunter's sentiments... if not his verbal eloquence.
Here's an interesting aside...
The surface area of the OEM 76mm bore is pi*r^2 = 4536.5 mm^2
For the aftermarket 79mm bore, the surface area = 4901.7 mm^2
Now imagine a square hole almost 2cm x 2cm large. That's the additional surface area that will theoretically allow more air in.
I'm not sure this would translate into better engine breathing, or diminished air speed velocity. One should not expect dramatic improvements on a normally aspirated engine with intake and exhaust mods, but it's my hope that the sum of each improvement would make some difference.
I'll dyno test next week.