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Old 09-11-2019, 05:32 PM   #15
Scooby Specialist
Member#: 447898
Join Date: May 2016
Chapter/Region: BAIC
Location: W Sac, CA
2016 WRX (traded)
2019 STI CWP


Originally Posted by xX_STI_Xx View Post
I know that the EJ257 has port injection and not direct injection....that is why i am saying it's better for the valves. Look at the valvetrain reliability of any DI car nowadays, they are not too good.

DI was out before 2008 when the GTR was out....why didn't Nissan take on this technology back then while DI was still somewhat popular? The Z is in the same boat...why didn't it take on DI. DI is great for fuel economy and efficiency yes I get that....but in terms of creating more issue inside the motor, DI is notorious for making a mess of the valves, intake runners, throttle bodies, etc... Next time I am at my cousins dealership, and another FA is apart, I will gladly take a picture.

Google is your friend:

Again, DI has it's advantages of making power, and fuel economy. In terms of higher chance of issues related to carbon buildup, yeah you bet you @$$ it will!

Mark my words, there will be a section on NASIOC for the future STI model called "Carbon Build-up Issue(s)" when the new car comes out.

Have you even read anything that I've said or linked to? I specifically said that dual injection, like the BRZ's D-4S, can prevent carbon build-up.

Direct injection alone experiences carbon build-up.. I acknowledged that.

I asked how direct injection is a reliability or durability issue. No answer.

I pointed out that dual injection (direct & port) can solve the problem of carbon build-up. You argued that "Toyota motor" had dual injection and still had carbon build-up without providing any evidence. You then proceeded to ignore the articles that I provided...

Carbon build-up is a maintenance issue that can be prevented by dual injection. A mess on the intake manifold runners, throttle bodies, etc.? lol Can you explain how direct injection manages to do that? Hmm.. I guess port injectors shoot upstream (against vacuum) to clean those

And because I can't help it.. just like the GTR, when was the Z's engine designed again? Direct injection wasn't mainstream in 2008. Porsche and Ferrari only began to implement it in a couple of their engines in 2009...

Please don't spread false information.

Will the STI's FA have carbon build-up? That solely relies on if Subaru implements direct injection alone or dual injection (highly unlikely).
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