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Thoughts on this mod?
- Thread starter StoneColdBlue22
- Start date
Yes, capping it off would be bad. Another reason to be very careful about shade-tree mechanics posting info online! I mean it's not like Ford has actual engineers doing this kind of stuff- you should immediately jump to the conclusion that they purposely built in a boost-leak! I guess because they had no other way of controlling boost? Quick, post a video documenting your ignorance! LOL
I'm waiting for the video showing Ford purposely is limiting horsepower since they bolted the turbos to the head- gasp, no headers!
I'm waiting for the video showing Ford purposely is limiting horsepower since they bolted the turbos to the head- gasp, no headers!
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He ran a 12.7 @ the track though. But that vid was posted a month before the boost leak one.I asked him, on YouTube, if there were any updates on this or if there have been any negative side affects so far. He’s claiming a gain of about .5psi and says there haven’t been any negative side affects so far. So….I guess we’ll have to wait and see. I can check in with him again in a week and see how things are going.
After a bit of research, that "pipe" is part of the EVAP system which prevents hydrocarbon emissions from entering the atmosphere by storing fuel vapors and routing the vapors to the engine to be consumed during normal engine operation. I did not find any info that it was also used for crankcase ventilation as suggested by post #6 but it's not out of the question.
Pertinent to the ST:
Don't play with it.
Pertinent to the ST:
- On turbocharged engines, an EVAP ejector is used to create a vacuum in the purge line during boost conditions. When in boost conditions a percentage of the boost pressure is applied to the EVAP ejector to create a vacuum. This vacuum draws purge vapors through the EVAP ejector into the intake air system upstream of the turbocharger.
Don't play with it.
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Technically, it is a "boost leak", but it's minuscule. I doubt very highly it's 0.5 psi (how it that being measured, and what does it have to do with actual mass airflow?) It's there on purpose to supply a way to purge cannister vapors (and possibly crankcase ventilation) during boost conditions. It is not hurting performance in any way as the ECU can easily command more boost to make up for it. This is not a "mod", it's superstition. If you want to spin your wheels playing with things you know nothing about you'll be rewarded eventually with some strange EVAP or PCV related codes.
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The way I understand it…and I could have read it wrong…is that it doesn’t “leak” boost but pulls a vacuum instead. I just glanced at what I was reading though.
Here’s the link:
http://www.hendersons.co.uk/wms/ven...constriction,a consequential drop in pressure.
Here’s the link:
http://www.hendersons.co.uk/wms/ven...constriction,a consequential drop in pressure.
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You're absolutely right. Using boost pressure through a smaller orifice (jet, nozzle, ejector) causes the velocity to increase. The increase in velocity produces a decrease in pressure. When used with a properly sized orifice this will make a vacuum, the same way carburetors and paint sprayers work. During boost, there is no vacuum in the intake manifold, so because we don't wish to vent hydrocarbons to the air, it looks like Ford is using this method to direct them into the intake of the turbo so they can be burnt. The info in post #13 came directly from the service manual. It's a bit vague, but they may be because they have used various mechanisms and don't wish to rewrite the manuals constantly.
But yes, some of that "boost" does "leak" back to the compressor inlet. As I said before, it won't have any effect on performance.
But yes, some of that "boost" does "leak" back to the compressor inlet. As I said before, it won't have any effect on performance.
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