Wastegate springs values-[5kT]

[Tim Sexton]

Hello Stephane,
1.    On the Type$$, all you need to do remove to take off the wastegate cap is
move the washer fluid reservoir out of the way.  Then remove the 10mm nuts
holding the cap on.  I think there is six of them.  Also, hang on to the cap
when you get ready to remove the last bolt.  The spring exerts considerable
pressure on the cap.  Lastly, remove the upper wastegate hose.

2.  Up here at High altitude, 6000', it lowered the rpm point at which the boost
started coming up.  I could make 1.4 bar at about 2700rpm after the mod.  It
really helps to eliminate early wastegate cracking.  It was an excellent "bang
for the buck" modification.

Hope that answers your questions.

Tim Sexton
Colorado Springs, Co

91 V8 5speed
87 5kcstq
89 200
94 90cs quattro sport

"Livolsi, Stephane" wrote:

> Tim , thanks for the write up. I would like to do this but have a couple of
> questions:
> 1.  How easy is it to remove the wastegate cap?  Is it right there or do you
> have to take off a bunch of other stuff (intake runner, etc?)
> 2.  Once this mod is done, what can one expect in performance gains and are
> there any downside driveability problems?
>
> Thanks a bunch
>
> Stephane
>
> > ----------
> > From:         Tim Sexton[SMTP:5kcstq at codenet.net]
> > Sent:         November 3, 2000 9:30 AM
> > To:   quattro at audifans.com
> > Subject:      RE: Wastegate springs values-[5kT]
> >
> > Yes, you can make an adjustable wastegate.
> >
> > 1.  Remove the wastegate cap
> > 2.  Remove the wastegate spring perch from inside the cap.  The 10mm , I
> > think but its been awhile, allen bolt holding the perch was installed
> > with Loctite so it's quite hard to break loose.
> > 3.  Use an appropriate tool to pop out the metal "cover" in the center
> > of the wastegate cap.  NOTE:  Just look down the threads of the sping
> > perch bolt you just removed and you will see what I am talking about
> > 4.  Thread about a 2.5" bolt down the center of the cap from the top.
> > Sorry,  I don't remember the exact thread/size of the metric bolt.  It
> > will be stiff, but the threads do exist all the way through  the cap.
> > 5.  Use a nut on the top and the bottom of the spring perch to secure it
> > to the bolt you just threaded down the center of the cap.  NOTE:  You
> > may need to grind down at least the top nut to allow a greater range of
> > adjustment unless you are able to find really thin nuts
> > 6.  Put a large washer on the spring perch seat.  This will allow
> > adjustment of the perch without the spring binding.  NOTE:  This is not
> > absolutely necessary, but it is a good safety precaution.  In theory, if
> > the spring was to bind as you turned the perch, it could tear the
> > wastegate diaphram.
> > 7. Re-Install the wastegate cap.
> > 8. Enjoy.
> >
> > I have done this same procedure three different times, all
> > successfully.  Instructions are specific for MC1 engine. 86-early89.
> > If anyone needs any further explanation, drop me a line.  I will see
> > about getting the exact specs for the nuts and bolt this afternoon.
> > HTH,
> >
> > Tim Sexton
> >
> > 91 V8 5speed
> > 87 5kcstq
> > 89 200
> > 94 90cs quattro sport
> >
> >
> >
> > --=======13236185=======
> > Content-Type: text/plain; charset=us-ascii; format=flowed;
> > x-avg-checked=avg-ok-1FF03D0B
> >
> > I believe you adjust the tension on the spring by shimming.  I think
> > I've
> > read here about someone coming up with a threaded variable adjustment
> > system.
> >
> >
> > At 11:54 PM 11/02/2000 -0500, Ameer Antar wrote:
> >
> > >Does anyone know what wg spring ratings are out there? SJM only has a
> > 1.5
> > >and 1.8 bar spring. It would be nice to find a source for 1.6 bar or
> > >something between...Also is there any difference between KH and MC
> > >wastegates or wg springs?
> > >
> > >I was told you can adjust the value, how is this done...does it really
> > >work properly? Thanks much.
> > >
> > >-ameer
> > >'84 5kT
> > >
> > >
> > >
> >