Dumping waste gate exhaust and other questions

[JShadzi at aol.com]

> Since I am not going to buy a ur-S4.  I have decided to sink (throw) money
> into my 86 5ktqcs that has 254K miles.
>

I say way to go, you can make the car just as quick for a lot less money.

> Question:
> 1) What affect would dumping the waste gate to atmosphere instead of the
> muffler have on performance?  I want the car to make a cool sound when I
> shift at maw boost (ala World Rally cars).
>

Shouldn't have any effect on actual performance, big effects elsewhere though as far as sound and lots of nice carbon all over anything near it  ;)

> 2) Replacing cat back exhaust with custom made 3" system, would this reduce low speed acceleration?  I currently have a chip, cam and a/f.  I am using the stock 3 muffler system.  I figure one muffler would  work well with this
> 3" proposed system.
>

Yes, you will be fine with one muffler, even quieter than NA cars with 2, the turbo has major muffling effects.  3" system is the way to go, it will increase your low speed response, probably the biggest improvement you can make in the turbo cars aside from ECU mods.

> 3) Have any of you run w/o a muffler?  I would think that the turbo quiets
> the exhaust some what.
>

No, way loud, think going to jail, plus its downright annoying!  IMO

> 4) Is there a reason Stebro sells a system w/ 2 mufflers?  I friend has a Stebro on his 20vt and it is a single 3" pipe w/ one muffler.
>

No need for 2 mufflers unless you want it dead quiet, which is probably what Setbro is shooting for.  If you like a little boom to it, 1 muffler is fine, you can always add a little bullet later to take the edge off, check out my 3" system at :

http://www.80tq.com/turbo.html
>
> Thanks a bunch.

HTH,
Javad
80tq.com