Date: Sat, 19 Oct 2002 08:40:01 -0700
Reply-To: David Marshall <vanagon@VOLKSWAGEN.ORG>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: David Marshall <vanagon@VOLKSWAGEN.ORG>
Subject: Calling all turbo charger / Diesel experts!!
In-Reply-To: <20021018.214742.524.14.wilden1@juno.com>
Content-Type: text/plain; charset="us-ascii"
Life is a learning experience and I admit that I don't know everything so I
am asking for advice and constructive criticism of my logic.
Goal: To get more power out of my Turbo Diesel motor in my Syncro
Multivan.
Motor: 1.9L AAZ with a KKK K017 turbo charger
Injection: stock 0.80mm timing
Modifications: None other than a nice free flow air intake system
This is my understanding of how the turbo boost system work - please correct
me if I am wrong:
From what I understand a correctly working turbo charger will give you up to
"X" PSI boost and no more. This is dictated by the waste gate which is
built into the turbo charger and is factory set with no user changeable.
This waste gate is controlled by a small hose that comes from the output of
the turbo charger. On the intake manifold there is a blow off valve - this
is sort of an emergency waste gate that will activate if the turbo's waste
gate fails it is set to go off at 'X+Y' PSI.
Now, what I want to do is increase my boost pressure by a few PSI after I
install an intercooler. How do I accomplish this? There is really not much
information on the Internet about this - looking at the Honduh pages that
are out there everyone seems to be using adjustable blow off valves. Why
aren't they using adjustable waste gates? My assumption would be that the
procedure to increasing my boost pressure would be; 1 - disable the waste
gate by removing / plugging the control line. 2 - replace the factory waste
gate with an adjustable one and set it to the desired level.
Now, what is too much boost on a Turbo Diesel? My feelings on this is to
install a intake boost air temperature gauge prior to doing any
modifications and go for a drive on my favourite 'load you engine up to the
max' series of hills that are just a few km from my house and monitor the
intake temps. Then install the intercooler and do the same drive again and
monitor the intake temps. In theory the intake temps will be lower due to
the presence of an intercooler. Then start increasing the boost pressure
until the air temps are the same as what they were prior to the intercooler
installation. Does this make sense? Shouldn't I be increasing the injector
timing when I increase the boost - is there a set ratio for this?
Is my logic correct in all of this or is there something that I am missing
as I am not a member of the secret turbo club?
Many thanks in advance - I'll be sure to share all my turbo wealth to anyone
who needs it!
David Marshall
Fast Forward Automotive Inc.
4356 Quesnel Hixon Road
Quesnel BC Canada V2J 6Z3
http://www.fastforward.ca mailto:sales@fastforward.ca
Phone: (250) 992 7775 FAX: (250) 992 1160
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