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flightlead404 flightlead404 is offline
Join Date: May 2015
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Originally Posted by Rawknees'Turbo View Post
...that is the vacuum limiter (aka - the deceleration valve) - it is a strange device that causes RPMs to hang up when the throttle is suddenly closed - running without it results in much better throttle response, and more exhaust crackling during closed throttle.
Can you elaborate on "better throttle response"?

AFAICT the vacuum limiter has absolutely no effect on increasing RPM, that is when you put the boot in it. It only delays the drop in RPM when you take your foot out.

So how is that "better"? Please define best.

Doesn't preventing a sudden drop in RPM help keep the turbo spinning during rapid upshifts and therefore reduce turbo lag? Isn't that the "flat footed shifting" feature in modern ECU's?
Old 01-23-2017, 06:16 AM
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