Fabspeed Mufflers and Resonance
02-23-2007 | 12:24 PM
#1
Thread Starter
Burning Brakes
Joined: Jan 2004
Posts: 1,176
Likes: 1
From: Houston
Fabspeed Mufflers and Resonance
So now that Fabspeed made good to Manny, what is up with this resonance thing at 2000 rpm? I thought I wanted these mufflers, but I don't think I do if this is the case.
Do other brands have problems with resonance?
Do other brands have problems with resonance?
02-23-2007 | 01:02 PM
#7
Pro
Joined: Aug 2004
Posts: 530
Likes: 0
From: Nashville, TN
Originally Posted by DCP
When most folks install PSE, do they install the switch or just the mufflers and leave it in loud mode?
It was great
Just waiting for PSE for my cayman now...
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02-23-2007 | 03:39 PM
#12
Burning Brakes
Joined: Dec 2006
Posts: 814
Likes: 1
From: Zurich, Switzerland
On a different thread I started a discussion with the provocative argument that PSE adds weight and decreases hp of the n/a 996. Dell replied: "FYI....PSE does NOT decrease hp. Not sure where you heard that from."
... and I quoted following: "There's a discussion on German P Car boards like "elfertreff.de" (you may say Germans have no clue about Porsche) that talks about following issue: opening the valve in the muffler changes the length of the exhaust pipe and the exhaust back pressure to the engine. The engines are setup to operate optimal under a certain back pressure and if you don't change the settings on the ECU, there's a loss of hp and torque.
Porsche doesn't claim any hp gain but they do also not confirm that the PSE keeps the car on stock hp with the open valve. Have you done a before - after dyno?
There's a report of a German 996 owner that said his car had a 6kmh lower top speed with the open valve than with the closed valve.
Above is just a discussion input as not scientifically proven, so please prove me wrong."
Can anyone comment on this?
... and I quoted following: "There's a discussion on German P Car boards like "elfertreff.de" (you may say Germans have no clue about Porsche) that talks about following issue: opening the valve in the muffler changes the length of the exhaust pipe and the exhaust back pressure to the engine. The engines are setup to operate optimal under a certain back pressure and if you don't change the settings on the ECU, there's a loss of hp and torque.
Porsche doesn't claim any hp gain but they do also not confirm that the PSE keeps the car on stock hp with the open valve. Have you done a before - after dyno?
There's a report of a German 996 owner that said his car had a 6kmh lower top speed with the open valve than with the closed valve.
Above is just a discussion input as not scientifically proven, so please prove me wrong."
Can anyone comment on this?
