Thanks for the technical part of how it does what it does.

I realized what it did in effect but what I asked was does the AAZ turbo
work this way and if it does to what altitude can it feed the engine the
full boost the engine expects?

Mike

On 7/1/08 7:10 PM, "David Marshall" <mailinglist@FASTFORWARD.CA> wrote:

> It's all relative...
>
> The TDI and most other modern turbo
> engines uses a MAP or Manifold Absolute Pressure sensor.  So, in an
> absolute vacuum the ECU will see 0 mbar - at sea level on an average day
> you will see 1000mbar and at the top of a mountain it will be say 900mbar
> - these values are all with the engine off.  So the ECU controls
> boost using this MAP sensor - for a stock ALH TDI this is 1950mbar for
> maximum boost, which if you compare it to the outside air pressure, it
> will be higher in a mountain than at sea level, but in effect, it is the
> same amount of pressure on the inside of the manifold.
>
> David
> Marshall
>
> http://www.hasenwerk.ca
> Box 4153, Quesnel BC,
> Canada V2J 3J2
>
> Engine Conversion FAQ -
> http://www.hasenwerk.ca/faq
>
> On Tue, July 1, 2008 16:04, Mike
> Miller wrote:
>>
>> All,
>>
>> When I had an
> 02 TDI I was told the turbo produced more boost than the
>> engine
> was set up for at sea level. This allowed full power to 5000 feet
>> where the boost no longer had to bled off.
>>
>>
> Also told the 944 turbo Porsche was set up the same way.
>>
>> Anyone know is this is true and if it's true for the TD engines?
>>
>> Mike
>>