Date:         Wed, 13 Jul 2011 07:25:11 -0700
Reply-To:     Mike Miller <mwmiller6@ATT.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Mike Miller <mwmiller6@ATT.NET>
Subject:      Re: AAZ overboost
Comments: To: Tom Hargrave <thargrav@HIWAAY.NET>
In-Reply-To:  <001201cc4155$6b0e8100$412b8300$@net>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes

I'm talking about the AAZ turbo on the AAZ engine.

There is no VW documentation regarding what altitude it provides full
boost to. Wasn't on the Jetta either, the mechanic at the dealer said
so. The only documentation on this I've ever seen was a Porsche ad on
the 944 turbo [I think, might have been the 924, long time ago] which
said 5000 feet.

Mike


On Jul 13, 2011, at 5:07 AM, Tom Hargrave wrote:

> Now that's a different question. In the engine it was originally
> installed
> on the turbo will provide full boost at whatever VW documents. But
> install
> the turbo on another engine and all bets are off.
>
> This is because a turbo is a air pump with a set capacity blowing
> air into
> another air pump (the engine) that's drawing in air from the same
> space that
> the turbo is filling. Install the turbo on a engine that pumps more
> air and
> it can't produce as much boost.
>
> Thanks, Tom Hargrave
> www.stir-plate.com
> www.towercooler.com
> www.kegkits.com
>
> -----Original Message-----
> From: Mike Miller [mailto:mwmiller6@att.net]
> Sent: Wednesday, July 13, 2011 5:55 AM
> To: Tom Hargrave
> Cc: vanagon@GERRY.VANAGON.COM
> Subject: Re: AAZ overboost
>
> yeah, that's the idea.
>
> But I'm not asking about my [long gone] 02 Jetta. I'm asking about the
> AAZ turbo.
>
> Does anyone know to what altitude the turbo will provide full rated
> sea level boost?
>
> Mike
>
>
>
> On Jul 13, 2011, at 12:13 AM, Tom Hargrave wrote:
>
>> All turbochargers can over boost but boost is regulated by the waste
>> gate.
>> The ability to over boost is needed to ensure quick spin-up and
>> response and
>> as you mentioned in your post, to provide full rated boost at higher
>> elevations.
>>
>> The turbo Mercedes diesels I used to own were set to 1 BAR with a
>> mechanical
>> waste gate and if you knew what you were doing you could easily get
>> 1.5 BAR
>> of boost. 1 BAR is 1 atmosphere or about 14.5 PSI. Highway fuel
>> economy
>> actually increased a little with the higher boost setting.
>>
>> The Jetta, being a 02, may have computer controlled boost. If it
>> does then
>> you my be able to find a aftermarket controller to over-ride the
>> factory
>> curve. The 1989 Lebaron Coupe GTC I used to own was computer limited
>> to 12
>> PSI boost but a "off road only" performance computer swap set the
>> boost to
>> 15 PSI.
>>
>> Thanks, Tom Hargrave
>> www.stir-plate.com
>> www.towercooler.com
>> www.kegkits.com
>>
>>
>> -----Original Message-----
>> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On
>> Behalf Of
>> Mike Miller
>> Sent: Wednesday, July 13, 2011 1:06 AM
>> To: vanagon@gerry.vanagon.com
>> Subject: AAZ overboost
>>
>> Does anyone know if the stock AAZ turbo provides any over boost? I
>> had
>> an 02 Jetta TDI that I was told would provide full boost up to 5000
>> feet because of that over boost capability.
>>
>> Mike
>> -----
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