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Old 25-12-2016, 07:44 AM
Scoobie Noobie
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Default My17 wrx Boost target

Merry Xmas all

Just wondering what people are getting in regards to peak boost on their 15,16 and 17 wrx?

reason I ask, is that I use to be able to get 1.36bar but now only able to get 1.28bar?

thinking are there issues?

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Old 25-12-2016, 11:41 AM
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That small difference highly likely the high ambient air temps there wouldnt be concerned

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Old 25-12-2016, 12:02 PM
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Barometric pressure changes affect the running of the car.

The ECU sees the manifold pressure in absolute. That means it sees the pressure in the manfold and compares it to absolute vacuum. When you measure boost with a boost guage. It is referenced the pressure to barometric. So when you have 100kpa of boost on a boost guage, you are seeing 100kpa of boost ABOVE barometric presdure. But what you really have is somewhere around 201.7kpa of air pressure in the manifold. But if the ECU measured 100kpa of pressure in the manifold, what you actually have is probably a very slight vacuum inside the manifold. (Barometric pressure at sea level is averaged at 101.7kpa.)

Therefore if you measure the exact same MAP (manifold absolute pressure) on a day with a relatively high barometric pressure, and then achieve that exact same MAP reading on a day with a relatively low barometric pressure. Then you are actually achieving MORE boost on the day with the lower baro reading.
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Old 25-12-2016, 02:50 PM
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thanks for the replies...I have bee reading that these cars are getting 1.45 bar boost. I would like to see what people are getting to confirm if I am running lower than standard boost
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Old 25-12-2016, 07:16 PM
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Is the car tuned or stock? I know nothing about your vintage of wrx.
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