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Old 09-11-2019, 04:11 PM   #12
Scooby Specialist
Member#: 447898
Join Date: May 2016
Chapter/Region: BAIC
Location: W Sac, CA
2016 WRX (traded)
2019 STI CWP


"Port runner injectors" are what the EJ257 has. They wash the back of the intake valves in the same fashion. Dual injection is direct + port injection.

You'll still have some build-up on valves regardless of the type of fuel injector is used. You'll have minimal build-up as long as you have port injection (alone or dual injection).

Does your Subaru master tech have any pictures of 'gunky' valves from the BRZ's FA20D with D-4S dual injection? Hint: Carbon build-up isn't a problem for the BRZ.
Can he elaborate on the reliability and durability issues specific to DI? Carbon build-up is a maintenance item..

The GTR doesn't have direct injection because it was released in 2008 and has a 10+ year old engine. I'm sure it will have DI if and when they redesign the engine. Every modern engine is moving to DI.

Care to share some pictures of the disassembled "FAST ASF" Porsche DI engines?
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Last edited by WRXnick16; 09-11-2019 at 04:39 PM.
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