[Vwdiesel] VW 1.6 Diesel exhuast

[Doyt W. Echelberger]

At 01:00 AM 4/21/2006, you wrote:
>Ok, I'm new to the forum, but have read just about all the postings. My
>question is simple, I want to increase the exhaust diameter from what
>it is now to 2 or 2.5 inches. I figure if it helps the trucks, why
>can't it help my NA diesel. Has anyone tried this, if so what were your
>results. All suggestions are welcome.
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

I made some different changes to my diesel exhaust, based on the same 
premise. And maybe I can add to Loren's 'etc' post.

On my 1.6 TD (Jetta, 1985) I run a straight pipe all the way back from the 
flange/downpipe.
Removed muffler three years ago.

Diameter of the straight pipe is stock, but taking out the muffler was a 
significant move in reducing back pressure, imo.

The sound is a little loud under hard acceleration as I wind up through the 
gears, but it is reasonable at legal highway speed, and if I don't want the 
noise I can keep my foot out of the throttle.

Certainly doing the same thing with a larger diameter pipe would be a 
reasonable thing to try. I'd be interested in how a larger pipe would 
affect the noise level in a no-muffler system. It might be noisier, because 
it is closer to no pipe at all.

You were talking about a naturally aspirated engine, so I'd expect the 
result to be much louder than with the TD. The turbo quiets the exhaust 
considerably. Maybe a n.a. couldn't tolerate a straight pipe.

You might try loosening/removing the entire system of pipes and muffler, 
and see how it runs that way, and then base your mods on what you see in 
the test runs. Perhaps the tests could take place away from closely 
monitored and inhabited communities.

Doyt