In factory configuration it doesn't. It measures the air mass entering the compressor inlet and guesses what the boost level is based on engine rotational speed. And that is only used for the worthless factory dash gauge.

delta448 said:

In factory configuration it doesn't. It measures the air mass entering the compressor inlet and guesses what the boost level is based on engine rotational speed. And that is only used for the worthless factory dash gauge.

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Thank you for the answer.

How does ecmlink know to display boost?

Its an estimate that's calculated based on either measured airflow and temperature or manifold pressure and temperature, the same way that your factory engine did things.

srt4tom said:

How does ecmlink know to display boost?

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motomattx said:

Its an estimate that's calculated based on either measured airflow and temperature or manifold pressure and temperature, the same way that your factory engine did things.

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Thank you very much sir.

srt4tom said:

How does ecmlink know to display boost?

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The only way the computer really knows is if you are running a MAP sensor that measures boost and inputs that information into your computer.

^^^^^
That's how all of mine know.

1990TSIAWDTALON said:

^^^^^
That's how all of mine know.

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You'd have to get a special MAP sensor that can read that small amount of boost you're running.

Vegas smith said:

You'd have to get a special MAP sensor that can read that small amount of boost you're running.

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- say what? Marty, you going to take the trash talk? BAN him!

Slap a warning on him so fast it'll make your head spin!!!!

I love Vegas, we have had our fun in the past, right @Vegas smith ???
The little boy in the red car with the phrase of "does 40 psi AWD burnout" was a fun time!
We got in trouble for that too, . Right Vegas??
I will try to get a 1/4 BAR map sensor for my measly little snails......

Thank you guys very much for your replies.
it just seemed to me that it had to have a map or something to read the pressure.
mine didn't have the map sensor on the intake, so i hooked one up with a vacuum line.

I know that everyone says it's a boost leak causing it to fall on it's face when it hits boost,,but I've stopped all that I could find with the soapy spray.
Like throttle body was leaking,blowing bubbles,, now no more from that.
the egr was leaking deleted it and blocked it. No more bubbles there.
Injectors leaking,,was,, no more there.
leak down is down to about 1 psi per second,,,I read that was acceptable ,I thought for sure that it was because of no map sensor but just got back from a test and still there,,,,I'm stumped,,,,,Help!!!!

You haven't described what your problem is so it's hard to help you. We also know nothing about what car you drive what is done to it.

I'm sorry,,the car just bogs down when the boost gauge crosses ""0""