[T3] type3-vwtype3.org Digest, Vol 99, Issue 7

[Phil Hof]

As you probably already know, Keith, I found what seems to be a good spot on my stock muffler.  It’s in the input end of the resonator, so it gets an average of all cylinders.  And I used the longer spacer/boss so it doesn’t protrude much into the exhaust stream.  You can see in this Samba photo:
https://www.thesamba.com/vw/gallery/pix/1474563.jpg

I like this setup, because I can easily exchange the resonator for a stock one in just a few minutes, and not subject the O2 sensor to all the “wear” in the form of condensation, rust, rich running when cold, etc. from my typically short drives.  That photo shows about the right “clocking” so the sensor is at about 2 o’clock position… up high so it doesn’t get moisture, and not so high that it interferes with the rear valance (though the latter may depend on what O2 sensor you use).  I have it out of the car at the moment if you need measurements or better photos.

One thing that is critical if you go this route is to make sure there are absolutely no leaks at that elbow where it fits into the main muffler body.  Any leaks will probably really foul it up, and good sealing takes patience, and often a bit of muffler cement, like this stuff:
https://www.thesamba.com/vw/gallery/pix/1809640.jpg <https://www.thesamba.com/vw/gallery/pix/1809640.jpg>
Many are not shaped well to seal right, and so a new donut, cement, and careful tightening of the clamp are needed.

-Phil

> ----------------------------------------------------------------------
> Message: 1
> Date: Thu, 27 Dec 2018 21:05:12 -0500
> From: "Keith Park" <topnotch at nycap.rr.com>
> Subject: Re: [T3] Giving up Stock FI
> Good location for the WB in stock exhaust is a problem, Im running the
> reccomended Ernst with the sensor on the left end,
> Probably best but I didn't want to put it in the tailpipe and cause an
> obstruction,  Ray claims the "lean spot" may just be
> A red herring from the WB, but it also misses in this spot if too lean, but
> adjusting the timing of the injectors does help with that, so cam timing and
> FI timing is also a factor.
> 
> So much to consider, but at least with the closed loop system you can make
> adjustments for these issues.  Problem is that with ME,
> I might never stop staring at gauges, laptop graphs etc. and tweaking
> things!
> 
> Keith


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