[Vwdiesel] Eps device, turbos & exhaust

paulr reichp at earthlink.net
Wed Sep 8 23:59:19 EDT 2004

My car was going a bit "flat".  I tried removing and spraying the guts
of the MAF with some brake cleaner.  It seemed to make a difference....
Nothing scientific, just a thought.

Could oil fumes from the crankcase vent reach the MAF and foul it?


2000 Golf TDI

Lee Hillsgrove wrote:
>>Wasn't there some trouble with the epsilonian device as well? was that
> taken
>>care of?
>  I dunno, some people had issues with it, I have had mine installed for ~75K
> and it has worked just fine. In retrospect, I wonder if the problems had
> anything to do with those that had weak or failing MAFs on their A4s?

>  That means I'm up around 75K Upsoluted miles, too.  :-))
>>Just built the 2.5" downpipe today for this thing.  Sounds like a downspout
>>with some supersonic cats stuck in it now.
>>Might need a muffler.....
>  The tail piece of the converter on my '98 Jetta TDI rusted off recently,
> flush with the midpipe. It was really quiet, even only having a few feet of
> pipe (if that) and the intact converter. When I got a chance to inspect more
> closely, I was somewhat dismayed to find that at least a third of the
> honeycomb in a band near the outer edge had a thin, continuous layer of
> soot - on the *outlet* side. That says to me that it was pretty
> significantly plugged. If there was any exhaust flow through there, it would
> have blown that fluffy soot right off.
>  Plugged no more.  :-))
>  What a freakin' mess that was. My son and I looked like we just climbed out
> of a chimney by the time we were done - sooty black from head to toe. Got a
> case of Popeye arm from swinging the hammer so much, too. We did it with the
> converter on the car - I was not, no way, going to mess with the outlet
> plate nuts. Best to let sleeping dogs lie. The biggest job was getting the
> remnants of the converter outlet pipe out of the midpipe, where it was
> broken off flush. That sucked.
>  Ho-leee crap, so THAT'S where my power went! Uncorked - open pipe out of
> the converter, just crawling along at about 1500 rpm with the clutch out on
> bare pavement in 1st gear, punching it will break the tires loose until it
> hits the rev limiter. *Breathtaking* difference. It did OK before, but
> nothing like this. I still run around 18 psi of boost after it settles out,
> but it builds up so much quicker, and at lower revs than it ever did before.
> Probably spikes up to about 20, then drops to about 16, and wavers around
> 18, depending on how aggressive you are with the pedal.
>  It, too, sounded as if there was a jet engine spooling up even when it was
> idling. To the floor at ~3500 rpm and at full boost, all you can hear is the
> shriek of the turbine noise, slightly drowned out by the rushing of exhaust
> through the 50mm outlet pipe. Sounds like an open shop air line, it's even
> louder than the muted roar of the exhaust noise. The exhaust is still
> quieter like that than my '85 1.6 NA was when the headpipe broke off at the
> same spot, though. That thing was deafening. No turbo to take the starch out
> of the noise.
>  That 50mm outlet HAS to go. I have a Techtonics 2 1/2" stainless system
> from the cat back, but right at the converter it's necked down from 2 1/2"
> OD to 50mm ID. I have it patched up right now with a 1 7/8" OD stuck into
> the 50mm ID pipe to quiet it down, but it's not a good fit and it leaks. A
> 2" OD is just a whisker too big to get into the 50mm ID. I have a manual
> pipe stretcher, but it wouldn't do a thing to the stainless pipe.
>  Looks like my plan of attack now is to find a muffler shop that will sell
> me a foot-long piece of 2 1/2" OD stainless that has been expanded to 2 1/2"
> ID on one end, then cut off the necked-down section and carefully trim back
> the tapered outlet of the converter until the 2 1/2" OD pipe will slid in,
> then I can weld it in place. That way, I'll get a full-sized system all the
> way back. Also need to get a pipe bent up to replace the rear muffler and
> incorporate a downspout, so my blue car doesn't have a black butt.
>  I am still absolutely amazed at just how much turbine noise there is since
> the converter became a hollow shell. I like it!
>  The Passat I picked up a while ago (but which hasn't made it onto the
> road - yet) is another prime candidate to be uncorked. It has very little
> power, takes a long time to rev up even in neutral, and you can't hear the
> turbo spool at all, plus it goes into limp mode if you try to climb a hill.
> Just before I bought it, the turbo shaft snapped and it filled the converter
> full of oil while it was trying to run away. It has a fresh rebuilt turbo
> now and I've verified that the vacuum lines are installed correctly. I'm
> sure the converter has got to be at least partially plugged. I shall see....
> :-))
>  Lesson for the day? Turbos LOVE to breathe.
> Lee
> Oo-v-oO
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Paul Reich                Electrical Engineer

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