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Boost pressure control

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alowlevelbot
New Member

Posts: 1

Boost pressure control Feb 17, 2021 1:40:48 GMT

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Post by alowlevelbot on Feb 17, 2021 1:40:48 GMT

HI
I have a few questions when reading Channel 115 with the Ignition on Car off I show 1010 mbar? Is that normal or do I have a issue because my actuals and requested are way off at all times it think because the static 1010mbar. I had a lot of issues with water in my map I recently attached a USP motorsports pigtail and new Bosch sensor. ITs a MK5 GTI

Last Edit: Feb 17, 2021 1:41:51 GMT by alowlevelbot

wastedspark
New Member

Posts: 3

Boost pressure control Sept 19, 2021 9:57:47 GMT via mobile

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Post by wastedspark on Sept 19, 2021 9:57:47 GMT

I’ve been looking at boost lately, from what I’ve learnt you will always see around 1000mbar (1 bar) as the map sensor will read atmospheric pressure the actual figure will depend on weather and sea level,

When you drive you’ll see it change,

I was checking my boost after fitting a rebuilt turbo and I would see a peak of 27psi (I changed my settings to imperial) and a stable reading of 24, when you subtract the atmospheric pressure from this, (1 bar = 14.7psi) you get 13psi peak and 10psi stable, which is about right for a stock engine.

Matthew
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Posts: 860

Boost pressure control Nov 2, 2021 5:00:54 GMT

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Post by Matthew on Nov 2, 2021 5:00:54 GMT

Wasted spark answered your question correctly in my opinion. With the engine OFF, ignition ON, the throttle body is not actually fully closed and as such is open to atmospheric pressure (1013.25 mbar at sea level). Your car is functioning normally in this regard.

2008 MK5 VW Golf GTI

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