911 Sport Exhaust
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RE: 911 Sport Exhaust - 1/15/2007 10:01:46 AM
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Bob259
Posts: 14
Joined: 6/29/2006
From: Upstate NY
Status: offline
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I remember me asking my brother that very question when he was considering adding it and he said they (Porsche) did not advertise any HP gains... however I can tell you from driving it both ways it seems to have more torque and be a little quicker. But that is all seat of the pants feel and nothing official.
FYI still looking for a copy of the installation paperwork to keep in my records if anyone has one.
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RE: 911 Sport Exhaust - 1/15/2007 5:06:28 PM
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Lee Willis
Posts: 519
Joined: 7/27/2005
Status: offline
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I had my 2004 Carrera Tiptronic with factory sport exhaust dynoed at 3100 miles, with the sport exhaust in normal mode and with the switch turned on (i.e., to quiet mode). This was done on a Dynoject 240 at Carolina Auto Masters in Durham, a reputable shop with real experts and a well calibrated, no-BS dyno. The back-to-back tests were done in a way to cancel out effects of heat soak and other descrepencies -- the test method is good enough to see about a 1% different -- (I have seen this type of test pick up the 2-3 HP gain from simply replacing a dirty stock aircleaner with a brand new one.)
The car did a maximum of about 268 RWHP either way. There was no difference at all in the two dyno curves from idle up to the red line, except at three tiny places in the RPM -- I forget where, but I think at 1800, 3600, and 5400 RPM, (not sure of the RPMs but they were multiples of one another) where the "noisy" mode dipped below the quiet mode by about 3-4 HP for about a 200 RPM range. Resonance of some sort, I figure. Anyway, with those exceptions, within that tiny band where the measured HP curve "wiggles" back and forth due to driveline wavering and noise in the system, the two curves were on top of each other all the way to the top.
I also have done relatively back-to-back (within half an hour, getting line to run again as soon as possible on a Friday night) quarter mile runs at the dragstrip with the car in both modes, and it is fastest in pure automatic mode (starting in 1st ) where it consistently runs 13.48-13.55 every time regardless of which way the exhaust is set.
By the way, this confirms my general experience. Noise doesn't make more power -- that comes from upstream flow improves in the headers/collectors/muffler entrance.
Despite that I like the feature. I hit the switch (turn the system to "quiet") every morning when I start the car about 6 AM to head in to work early: no need to wake up the neighbors.
< Message edited by Lee Willis -- 1/15/2007 6:55:15 PM >
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H. Lee Willis - "Live big while you can . . . You''''ll be put in a small box when you die."
Aston Martin Vantage V8
Lincoln MKZ daily driver
1998 Camaro - built 408/AFR: licensed and street driven mid-9s 1/4
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