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      11-26-2019, 08:49 AM   #211

Drives: 2018 440i / 2010 X5
Join Date: Aug 2016
Location: Cincinnati

iTrader: (0)

So I'm trying to wrap my head around our throttle closures. It already seems ridiculous to me that an electronic wastegate can't keep up with DME boost targets, but on top of that its using the throttle angle to compensate. Seems like everyone sees them across all tuners. Not as bad as the JB4 days, but still a factor that's not ideal.

Is it because of VANOS? I mean technically throttle angle is just an interpretation of the intake valve lift, right?

Is it because we don't have an actual diverter valve, so the car uses the intake to bleed off boost in a similar fashion?

Actually it might make sense if the throttle plate itself closes to reduce boost pressure in the manifold, then slowly bleeds air back in while the wastegate is adjusting.

And WHY THE HELL can't an electronic wastegate keep up on it's own?

It's starting to make more senses why big boost went with an aftermarket wastegate + controller combo.
Originally Posted by umizoomi View Post
As long as 3-pedals are an option, I will exercise my right to suffer the handicap and indignity of slower shifts and reaction times.
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