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Is the volume liveable for the street and is the power notable on seat of pants or dyno as single mod only ?



Thanks Jerry S
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Old 09-06-2007, 12:24 PM
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Smart quod bastardus
 
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how much hp will you gain from removing the muffler alone and installing a zork tube?
Anyone ever measure this on a dyno?
Old 09-06-2007, 12:57 PM
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Has been measured at 15hp.
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 09-06-2007, 01:08 PM
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Sound is in the ear of the beholder. It is too loud for me in the neighborhood but I have sold many to folks who think differently.
The power increase is noticable to the butt dyno. What you also notice is a more free revving engine and that wonderful turbo whizz. The actual power increase is dependant upon your present mods and the muffler you are using. The increase is not so much if you already have a free flowing muffler with a straight through design and a large ID.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-06-2007, 01:34 PM
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I actually have single out 3" Powehaus muffler with Euro exchangers and K-27



Thanks,

Jerry S
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Old 09-06-2007, 08:02 PM
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I have Euro exchangers and a K27 also. With the stock Euro muffler I notice a big change when going to the zork. There is very little difference however between the zork and my driver's side exit muffler.

I don't believe I've seen a Powerhaus muffler (unless I didn't know what I was looking at) , do you have a picture?
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8

Last edited by RarlyL8; 09-07-2007 at 05:41 AM..
Old 09-07-2007, 05:26 AM
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Quote:
Originally Posted by RarlyL8 View Post
Sound is in the ear of the beholder. It is too loud for me in the neighborhood but I have sold many to folks who think differently.
The power increase is noticable to the butt dyno. What you also notice is a more free revving engine and that wonderful turbo whizz. The actual power increase is dependant upon your present mods and the muffler you are using. The increase is not so much if you already have a free flowing muffler with a straight through design and a large ID.
What he said^^^

I have a zork that I dabble with. I love the sound, but there are too many occasions where I just want to be anonymous...it's hard to do when the drivers around you can feel the sound of this little pipe hitting them in the chest as you're stopped at a traffic light! I drive mine daily and the novelty of an open pipe wears off after about two weeks...then the muffler goes back on!
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Old 09-07-2007, 05:46 AM
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I was running a straight pipe (like Zork but routed to the passenger side) for the last year. I'm now running a "straight thru" muffler (no baffle) that a local shop designed/built for me.

Sound-wise, there is a big (huge) difference - probably in the tune of 6db though as RarlyL8 said, its in the ear of the beholder. The muffler takes away some of the higher pitch (freq that we can hear) hence it will feel subjectively much more quiet than measured.

Power-wise, I had a cracked header (hence the start of this thread ) so did not do a back-to-back comparison yet. But with the new header and the muffler, on track, I still do not feel that the engine was any more restrictive or response was slower with the muffler.

The shop who did my muffler said that they once designed a straight pipe for a E46 M3 then a muffler. The hp difference on a dyno was 7. It may not have anything to do with our scenario but at least 1 data point.
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Old 09-07-2007, 06:05 AM
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A zork really is loud.

I love mine, but I live in the country. People mistake my car for a truck or something when they hear the sound at steady speeds, it is really a thick sound when you dump 6 cylinders into a foot of straight pipe.

The closer to population centers I drive, the more nervous I get.

A city would be a different story. It is loud like a straight Harley that rattles your ears. You would not get on the throttle in a city for fear of cops, and even then it still backfires.

I feel like it helps performance and keeps moving heat out of my engine. You can hear the turbo whirling all the time. And the sound is awesome if you want the most badass Porsche sound possible. It weighs two pounds.
Old 09-07-2007, 02:39 PM
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Good descriptions.

I always hear the "bzwizzzhhhh' of the turbo, along with a ton of pops and crackles.
An upshift or an out of gear shift is a necessity around the police.......technically as Zork owners, we have no muffler.
Easy ticket writeup!

I enjoy the absolute most raw aspects of a Porsche -
tons of appropraitely negative camber with 275/315 track tires, polybronze bushings, custom valved shocks, 23/33 sways with 150 lb coils, track seats -- all items not necessary for speed are for the most part removed.

If a hard a$s raw experience is what you are after, then a Zork should be on your short list
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 09-07-2007, 02:51 PM
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Here are photos:


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Old 09-09-2007, 08:42 PM
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And more


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Old 09-09-2007, 08:44 PM
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And more yet

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Old 09-09-2007, 08:48 PM
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Thanks for the photo.
Looks like the basic exterior is stockish in appearance. How does it sound?
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-10-2007, 05:01 AM
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Quote:
Originally Posted by hobieboy View Post
No worries... I did find out that Powerhaus is selling B&B meaning they are the same headers. So, I don't think there's any quality/performance difference

Back to the longer primaries - I thought longer ones mean that it will take longer to build boost since it takes longer to fill those?
When I went from short pipes to (B&B's) to equal length customs. The equals have very tight radius bends too. I noticed on the dyno that power came in later - about 200 rpm later. However, top end power (about the last 1200 rpm) more than made up for the 200 rpm delayed spool. The equals added a bit more than 20hp on top and more importantly, about 20 ft lbs of torque around 5500.

If you have a relatively stock motor with CIS, and you do mostly street driving and occasional DE's, the equal length pipes are not for you. If you DE frequently or race the car, and the motor has good mods (at least a cam), then consider the equal length pipe.

My equal length pipes do not have heat, but I live in GA and heat is not important - except for the occasional need for defrosting. However, when I had the engine oil cooler still on my engine, I made a box to collect the heat here and duct it to the heating system. Worked OK. Just an idea....
Old 09-10-2007, 06:06 PM
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Wo ist die Rennstrecke?
 
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Quote:
Originally Posted by Craig 930 RS View Post
Has been measured at 15hp.
I gained about this too. But I could not handle the resonance in the car, or the noise in my neighborhood. I changed to a straight-though muffler (Magnaflow), eliminated the resonance and can now drive the car anywhere without shouting HERE I AM through the open pipe. The best part is that there is no difference in performance.
Old 09-10-2007, 06:11 PM
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Sound is much more throaty and louder than stock.

Jerry S
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Old 09-10-2007, 11:01 PM
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Originally Posted by 930chef View Post
so far, i can only find ghl or b&b headers w/ heat. for a $1,000 less schnell offers headers w/o heat. am i missing any other manufacturer that makes headers w/ heat. im running kokeln i/c and kokeln ceramic ball bearing turbo w/ 964 cams....zork is en route...help, 930chef

I believe Albert @ GSF is selling headers with heat for $970.

W/O heat for $700.


From his site: http://www.goingsuperfast.com/Porsche-911-Turbo.html


"Header with heater Box. can be use on Porsche 911 turbo (1977 - 1994 ),
911Carrera (1984 - 1989 ) 964 (1989 - 1994 ) 993 (1995 - 1998 ).

With swivel flange it can be fit to all cars above, 304 stainless steel, 6 38mm primary tubes, 50
mm merge tubes,1.5 mm thick.

Kit includes headers, drip tank, AN-8 oil line, adapter to factory hard turbo oil return line, large
oil line from crank case to thermal stat."


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Old 09-11-2007, 05:16 AM
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Those are nice looking units and a good value as a kit but I don't see how you could get much heat out of those exchangers. There is not much surface area there. The GHLs that I have experience with have a similar design and do not produce any useful heat.
304 is inadequate for the application in my opinion. You need a larger margin of heat tolerance given the many different engine setups and uses these cars see.
I'm all about saving money but these potential issues need to be considered.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-11-2007, 05:53 AM
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