Low Boost?

[Derek Pulvino]

Brett,

Ya, at first forgot about the coolant temp sensor, and knew there were two
ambient sensors for the climate display, but didn't realize there was no
ambient air info going to the ecu.  I guess ambient temp. could be inferred
knowing boost pressure (which would be independent of altitude, but hey
there's a sensor for that anyhow) and intake air temp.

Still trying to think of a reason you'd need ambient temp empirically; I
guess if there is not a sensor for the data, then there likely isn't a
reason to make the direct measurement.  But now I digress into a reinvention
of the wheel...

But how about the other half of the question concerning failure frequencies?

Derek P


>From: Brett Dikeman <brett at cloud9.net>
>To: "Derek Pulvino" <dbpulvino at hotmail.com>, 200q20v at audifans.com
>CC: QSHIPQ at aol.com
>Subject: Re: Low Boost?
>Date: Mon, 20 May 2002 14:52:27 -0400
>
>At 11:11 AM -0700 5/20/02, Derek Pulvino wrote:
>>Scott,
>>
>>Below are you referring to the intake temp sensor or ambient air sensor?
>
>Both ambient air temp sensors are for climate control only.
>
>I believe scott was referring to the charge air temp sensor(top of IM) and
>the coolant sensor(backside of the block, passenger side.)
>
>If either fails, the ECU assumes worst case scenario and adjusts
>timing/limits boost appropriately.
>
>Brett
>--
>----
>"They that give up essential liberty to obtain temporary
>safety deserve neither liberty nor safety." - Ben Franklin
>http://www.users.cloud9.net/~brett/


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