Quote:
Originally Posted by 911st
I know most want to remove the throttle bypass valve as they think of it as a smog device.
I have noted this before but it also helps minimize turbo stall between shifts in a way similar to the compressor bypass valve dose.
This helps keep boost up between shifts and makes things easer on the turbo shaft and bearings between shifts.
It also adds a little safety as if the CBV fails you will not be as likely to snap a turbo shaft.
The AAV is just a cold start feature.
If either are removed, yes, block them off and use clamps to prevent blow off.
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...and you can just not let your foot off the accelerator all the way between high speed shifts and do the exact same thing without being married to it if you believe that theory.
along with that, by removing this emission device you get quicker deceleration of the engine during low speed around town gear shifts so the engine rpms match perfectly during casual upshifts making pleasent smooth driving.
and by golly you'll also have a much more stable idle speed with one less artifact from the early days of fuel injection thats just waiting for you to close the hood so it can play vacuum leak and mess with you.