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Old 12-04-2012, 09:13 PM   #1
Wheels
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Default I feel for all you BRZ owners. :(

Your in for a rough time with the intake valves. My BMW 335 has Direct injection and it suffers from pretty bad carbon and oil build up on the intake valves thanks to the PVC hitting the valves and then they never see gas because of the direct injection and the heat build up makes the oil become a film then a builds up and up till the valves close no more.
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Old 12-04-2012, 09:27 PM   #2
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I'm just gonna put this here. Take it as you will, I'm not here to argue.

"The Toyota direct injection system I described above is referred to as D-4S and it was implemented on the FR-S/BRZ. However you'll note that Subaru had to resort to just direct injection alone on their own new cars, so those engines will experience the same carbon build up as everyone else. The FR-S/BRZ has D-4S and therefore will not."

Read entire thread here:
http://www.ultimateyota.com/index.ph...&topic=10273.0


Here's a video explaining D-4S
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Old 12-05-2012, 08:38 AM   #3
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Correct there is port injection also on the FRS/BRZ so the valves should stay much cleaner. It's been proven on the newer Toyota/Lexus models to help with that issue.
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Old 12-05-2012, 11:18 AM   #4
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Quote:
Originally Posted by tibug View Post
I'm just gonna put this here. Take it as you will, I'm not here to argue.

"The Toyota direct injection system I described above is referred to as D-4S and it was implemented on the FR-S/BRZ. However you'll note that Subaru had to resort to just direct injection alone on their own new cars, so those engines will experience the same carbon build up as everyone else. The FR-S/BRZ has D-4S and therefore will not."
This is factually incorrect. Subaru has designed their own oil/particulate separator for PCV, so no particulates should make it into the intake stream, thus avoiding carbon buildup.
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Old 12-05-2012, 12:16 PM   #5
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I was wondering about that statement about Subaru's Direct Injection. They use Port Injection normally, so it would be odd to not use some form of PI in conjunction with DI, I would think.
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Old 12-05-2012, 12:44 PM   #6
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Carbon build up, that's what Seafoam is for. Check out their site, the stuff really works.
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Old 12-05-2012, 04:46 PM   #7
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I was wondering about that statement about Subaru's Direct Injection. They use Port Injection normally, so it would be odd to not use some form of PI in conjunction with DI, I would think.
Correct it uses both and that's a good thing. First off it keeps the valves clean and secondly it allows for much more HP potential since it's much easier to add larger port injectors and tune them vs. finding and installing larger direct injectors.

The whole direct injected engine apparently was a Toyota must have and apparently Subaru didn't want to use it. In the end it's a huge performance advantage to have DI.
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Old 12-05-2012, 05:36 PM   #8
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Originally Posted by Sub!eDr!ver View Post
This is factually incorrect. Subaru has designed their own oil/particulate separator for PCV, so no particulates should make it into the intake stream, thus avoiding carbon buildup.
Is this in all the new Subaru engines? I didn't even know that new Subarus had DI, besides the BRZ, of course.
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Old 12-05-2012, 05:47 PM   #9
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Is this in all the new Subaru engines? I didn't even know that new Subarus had DI, besides the BRZ, of course.
This is in all Subaru's new Direct Injection engines (aside from the BRZ). That would include the Legacy DIT (2.0 turbo - Japan-only for now), and the new Forester 2.0 turbo (coming here next year).
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Old 12-05-2012, 06:32 PM   #10
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Ah okay, I didn't mean to spread false information. Thanks for the correction.
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Old 12-06-2012, 01:35 AM   #11
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I'm curious, how exactly does port injection make any difference to build up?

It's not burning in the intake port so what does it matter? New to this engine stuff, sorry.
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Old 12-06-2012, 04:01 AM   #12
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I'm curious, how exactly does port injection make any difference to build up?

It's not burning in the intake port so what does it matter? New to this engine stuff, sorry.
It allows fuel to pass over the intake valves, which prevents the carbon buildup.
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Old 12-07-2012, 09:53 AM   #13
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Originally Posted by Tedde22 View Post
I'm curious, how exactly does port injection make any difference to build up?

It's not burning in the intake port so what does it matter? New to this engine stuff, sorry.
Gasoline is a great solvent. As it passes through the intake port it dissolves any carbon that has started to accumulate.
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Old 12-07-2012, 02:11 PM   #14
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Use Shell, Chevron as best at no deposit and cleaning up what you get.
Techroline best cleaner.
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Old 12-20-2012, 10:59 AM   #15
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Gasoline is a great solvent. As it passes through the intake port it dissolves any carbon that has started to accumulate.
Actually, it's the detergent additives in the fuel that prevent carbon buildup. In the BRZ Port/DI engine, you really want to use a Top Tier gasoline. http://www.toptiergas.com/
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Old 12-20-2012, 11:40 AM   #16
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Originally Posted by SpamBot View Post
Actually, it's the detergent additives in the fuel that prevent carbon buildup. In the BRZ Port/DI engine, you really want to use a Top Tier gasoline. http://www.toptiergas.com/
I agree but any gas from the addition of port injection really helps to prevent major mechanical issues plagued by DI. Now I can attest to higher quality fuels that have a higher "add pack" to the fuel because we've torn apart hundreds of engines, some with very high mileage and very clean intake ports, and engines with less miles with very dirty intake ports. When we see abnormally clean intake ports I always ask the customer what fuel they run and I hear a lot of Shell and Sunoco. I know Chevron is good but it's just not as common as the others.

OP,

As for feeling sorry about us, feel sorry that our taillights are full of water and our windows squeal like a pig
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Old 12-20-2012, 12:23 PM   #17
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Originally Posted by Element Tuning View Post
<snip>
OP,

As for feeling sorry about us, feel sorry that our taillights are full of water and our windows squeal like a pig
Possible taillight water solution: Years ago I had a Plymouth Voyager minivan that had the quite-common problem of the front turn signal lights filling with water.
Solution: drill a couple small holes at the bottom of the lens, large enough for the water to drain out. Problem solved.
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Old 12-20-2012, 12:49 PM   #18
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Originally Posted by Sub!eDr!ver View Post
Possible taillight water solution: Years ago I had a Plymouth Voyager minivan that had the quite-common problem of the front turn signal lights filling with water.
Solution: drill a couple small holes at the bottom of the lens, large enough for the water to drain out. Problem solved.
No way, it has only 3400 miles.

There is a recall on this and the dealer is taking care of it. Apparently the taillights are 5 pieces and this is an assembly issue.

I'm glad I didn't smoke the lenses yet!
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