Straight Pipe vs Muffler

930 porsche · 11:48 AM

Let's talk performance and look. Let's look at our options:

1-Running a "Y" tube going to the right side and another one going to the left side of the car.

2-Running a straight tube to the right side of the car and a wategate tube to the left side just like Fabspeed muffler combo but without the muffler.

3-Running a small magnaflow type to the the right side of the car and a wastegate pipe to the left side.

4-Zork tube with a dual square end pipe.

I am trying to make the most HP and having a nice look at the same time.
The zork Tube is on the car now. Your expertise and advice will be greatly appreciated.

Thank you.

pkracer21j · 08-18-2009, 11:54 AM

leave the zork! originally i was going to custom fab a y pipe as you speak of. but I ended up loving the way my zork looks. 934 935 ish.

911st · 08-18-2009, 12:05 PM

Not sure I totally understand your question.

It is hard to beat a Zork tube in any measurable way on a turbo.

Look for a smooth transition from the turbin housing to the tube. Any step will create turbulence where you do not want it.

Other than that, anything that takes the bends out of it or makes them larger arcs might help.

A transition to a larger size tube starting at the turbo could help as long as it dose not do so to quickly.

Still, little would probably be gained from any of these improvements.

930 porsche · 08-18-2009, 12:08 PM

Yes I like the zork but I want to make it more of a conspicuous and more of a surprise for others plus it is nice to have all that power under the hood without knowing what is in there and stay low key.

930 porsche · 08-18-2009, 12:19 PM

911st,

I am trying to keep the same performance and have 2 pipe coming on each side of the car which is very common with a muffler but I am trying to do it without a muffler. To me I think it should not make any difference with or without muffler what do you think? It is all about look right now without loosing power.

cole930 · 12:53 PM

Think about it. .....Performance ..... did you ever see a factory Porsche Turbo race car with a muffler? Did you ever see a factory Porsche Turbo race car without a Zork? If performance is what you really want there is only 1 choice.

Cole

930 porsche · 08-18-2009, 12:39 PM

Cole930,

I am following you, but my question to you is instead of having the end pipe of the zork in the middle of the car, why can't we piped it out to a "y" and having both ends on each side of the car. A little more air will travel versus the short zork but the result should be the same. What do you think?

911st · 08-18-2009, 12:46 PM

Adding a Y would not be my choice as it will quickly slow down the flow of gasses.

Just exit the turbo out the passenger side and the WG out the drivers side.

Keep bends to a minimum. Pay attention to how the pipe transistions out of the turbo.

You are not going to surprise anyone as they will hear you coming a mile away.

Enjoy.

cole930 · 01:02 PM

If you want a muffler with one or two out each side call Bob Holcomb. He makes a killer setup with a straight through muffler out one side and an equal Dia. seperate waste gate pipe out the other. He makes the best you can get for quality and performance. But inexpensive is not in his vocabulary.
Rarly8 also can build something for you, he does excellent work and has displayed much of it here. Lots of us use him and he is very reasonable.
I'm going to be ordering another Zork and Waste gate pipe from him this spring.

Cole

930 porsche · 08-18-2009, 12:58 PM

911st,

Now we are talking. So the "Y" bend will hurt the flow of gasses and obviously hurt the performance, so you like option #2. Just for curiousity why do people put either a muffler or a small magna flow before the end pipe if it is going to hurt the performance besides being quiter which is not my intention? Then mufflers with 2 ends are actually loosing a lot of power am I correct? Then what is it that people are talking about back pressure?

RarlyL8 · RarlyL8's Garage

I have all of these configurations and more in my line of exhaust products.
The engine that I use for testing is mildly modified as would be the typical street 930 they are designed for. The difference in power between a zork and one of my mufflers is not significant enough to sway most away from some sound deadening. I offer a street version and a hooligan which is popular with the weekend warriors.
Will post some pictures for you when I get to my other computer.

David · David's Garage

A tapered section after the turbo up to full size seems the best performance wise, but I haven't seen one for sale. So I made my own.

Some pics of my set up: Turbo Exaust Theory

911st · 08-18-2009, 02:15 PM

Best I have seen!

DonE · 08-18-2009, 04:49 PM

Quote:

Originally Posted by RarlyL8

I have all of these configurations and more in my line of exhaust products.
The engine that I use for testing is mildly modified as would be the typical street 930 they are designed for. The difference in power between a zork and one of my mufflers is not significant enough to sway most away from some sound deadening. I offer a street version and a hooligan which is popular with the weekend warriors.
Will post some pictures for you when I get to my other computer.

I would go one step further and say there is no difference between a zork and a straight through designed muffler like a Magnaflow. I am sure of this because I did a dyno run with my using a straight pipe (zork) and one with a Magnaflow. There was no difference except for the sound. If you add a bend or a chambered muffler, you will loose performance.

930 porsche · 08-18-2009, 05:24 PM

So DonE, then what about a straight through designed pipe without a magnaflow muffler, same performance? How can I make the sound louder? To me the zork sound is not loud enough.

930 porsche · 08-18-2009, 05:26 PM

Rarlyl8, do you have some example or a website?

wcc · 08-18-2009, 05:27 PM

Here's my home made pipe. I adjusted the tip some so it looks better..

Zork sound... with Stock turbo on 78-80's 930 sound?

Video: http://www.youtube.com/watch?v=3LBxgrzc9xA&feature=channel

More recent pics:
Finally! Got her polished up for the summer.

930 porsche · 08-18-2009, 05:35 PM

Very nice exhaust. Could I make those same 2 pipe? Let me see I figure if you made those I could too. Good job 125shifter they are really good looking pipes.

930 porsche · 08-18-2009, 06:41 PM

WCC, I love your idea of having the pipe to the side of the car. I may just have 1 on each side. 1 from the turbo and the other from the WG.

RarlyL8 · RarlyL8's Garage

Don you are right, there is no significant difference in power between a zork and my muffler in a sub-400WHP 930. I cannot say on a 400+WHP engine because I have not tested them on one.

Here is the most simple system I offer. The sound is great. Both Sandman and Spence88 have these one their cars. Spence's is muffled and I think Sandy's is a hooligan.

Mounted:

If you like the look of the Zork without the neighbors throwing rocks at you I have this combo:

With custom Valance:

And of course the Zork: