Ok, so a bit of a click bait title, my bad.
First things first, car is an S4 B7 with an ecu tune, homemade piggie pipes (front cats smashed out), and miltek cat back.
Basically, been checking and testing a few things recently, and for one reason or another, fixed the intake manifold flap in the open (high rpm) position by removing the vacuum to the actuator…Knowing that the power should be down, I was a bit surprised with the result.
Firstly, the exhaust sounds nicer??? Much deeper v8 sound. Secondly, the initial throttle response below 3K rpm is actually better??? Flap isnt designed to open below 5K, so have a dead band between 3 and 5k. If I reconnect the flap actuator to how it should be, the throttle response is worse up to 3K, and obviously better after that. I’ve been trying to trace a tiny supercharger whine as well, and that seems to go away also lol (I know these engine’s whine, but I’ve got a good ear for things).
Now the “better throttle response” that I’m talking about isnt massive, but enough to notice. As well as the engine sounding much nicer, I’m a bit confused lol. Other than the mid band power, the car just drives and sounds sooo much nicer…WTF?
So for any techy gurus out there, whats your thoughts? I appreciate the engine is setup for the two different power bands of the intake flap, so is it just a coincidence that its better low down? Or what I’m wondering more, is that there’s something wrong somewhere, and for some strange reason, this has shown it up?
Thanks all. I know this all sounds a bit odd, but I’ve seen the odd mention of something similar before, and everything I say is 100% happening!