Date: Tue, 1 Jul 2008 22:45:56 -0700
Reply-To: Mike Miller <mwmiller@CWNET.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Mike Miller <mwmiller@CWNET.COM>
Subject: Re: Turbo overpressure
In-Reply-To: <1964.192.168.0.115.1214977576.squirrel@hasenwerk.homeip.net>
Content-Type: text/plain; charset="US-ASCII"
Cool, thanks. Now to find out how much overpressure it delivers and what
altitude it can deliver sea level pressure boost at.
Hmm.
Mike
On 7/1/08 10:46 PM, "David Marshall" <mailinglist@fastforward.ca> wrote:
> The AAZ is a simple waste gate control - a simple spring that opens at X
> pressure. In effect it should behave the same way as the computer controlled
> one does as it doesn't compare the ambient pressure with the manifold
> pressure.
>
> 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 22:16, Mike Miller wrote:
>> >
>> > 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
>>>> >>>
>> >
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