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Old 04-24-2014, 01:26 PM   #11
Vlad
Scooby Guru
 
Member#: 46135
Join Date: Oct 2003
Chapter/Region: Tri-State
Location: NY
Vehicle:
02 WRXstiV9 Spec C
C63 AMG

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Take a look at Wikipedia
http://en.wikipedia.org/wiki/Gasoline_direct_injection
No throttling lossess=no pumping losses, without a throttle plate...

Seems like there are three types of direct injection:
There is one with throttle, Toyota uses it and seems like Subaru uses it as well.
One with auxiliary throttle, needed at low load
One with no throttle, that uses a concept called stratified charge. This provides fuel savings at low loads. Audi seems to use this, but possibly not for the US market.

Last edited by Vlad; 04-24-2014 at 01:53 PM.
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