Exhaust sound
06-18-2017, 10:27 AM
#16
Advanced
Thread Starter
Thanks for all the info slink. I love the car but I do miss the scream of the NA engine. So many choices for exhausts, too bad it's not possible to hear them all in a comparison. Youtube videos only give you so much.
Im not sure about the whole breakin period thing. So much controversy but it's in the car manual. I figured I'd just follow it.
Im not sure about the whole breakin period thing. So much controversy but it's in the car manual. I figured I'd just follow it.
06-18-2017, 02:32 PM
#17
Burning Brakes
06-18-2017, 03:57 PM
#18
Intermediate
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My local track has a 100db (4000rpm) regulation, would that be a problem?
Any powergains with Shark?
06-18-2017, 05:02 PM
#20
Burning Brakes
Originally Posted by nolimits
Agree, spot on, did the Sharkworks too and it's a great happy medium. It's catback so should be no warranty issues. It adds some sound to the TTS but still not close to NA GT3s that hit 9K rpm.
If you're going to tune the car you really need to have a high flow cat exhaust like a Europipe or catless.
If you just want a little more sound Sharkwerks is fine. But if you keep the stock cats (as you do with Sharkwerks) you really can't do much with the tune of the car. Very small power gains with stock exhaust and tune as a tuner will not increase power more than the restricted flow stock cats can handle
06-18-2017, 05:06 PM
#21
Rennlist Member
On my 997 TTS before I went with the full BBI exhaust I had the Sharkwerks with some cat deletes...you can also do that if you are looking for more flow and more power...
06-29-2017, 03:22 PM
#22
I got deeply involved in this issue with a 991.2 C4S. The best answer I know is that in Sport mode, a little bit of gas is injected on throttle lift off, which then burns off in the hot manifold / exhaust system, creating the backfire sounds.
In Sport+ Porsche leaves the throttle body open (even though you may have lifted completely off the gas) but completely shuts off fuel so that air continues to pump through the engine and out through the turbos - keeping them spinning faster in anticipation of you getting back on the throttle. Because there's no fuel there's no backfires.
This scheme reduces turbo lag compared to Sport mode. All the 991.2 models (even those with the 3.0L turbo engine) do this and I've read that the TT and TTs do it also.
In Sport+ Porsche leaves the throttle body open (even though you may have lifted completely off the gas) but completely shuts off fuel so that air continues to pump through the engine and out through the turbos - keeping them spinning faster in anticipation of you getting back on the throttle. Because there's no fuel there's no backfires.
This scheme reduces turbo lag compared to Sport mode. All the 991.2 models (even those with the 3.0L turbo engine) do this and I've read that the TT and TTs do it also.
06-29-2017, 04:24 PM
#23
Rennlist Member
I got deeply involved in this issue with a 991.2 C4S. The best answer I know is that in Sport mode, a little bit of gas is injected on throttle lift off, which then burns off in the hot manifold / exhaust system, creating the backfire sounds.
In Sport+ Porsche leaves the throttle body open (even though you may have lifted completely off the gas) but completely shuts off fuel so that air continues to pump through the engine and out through the turbos - keeping them spinning faster in anticipation of you getting back on the throttle. Because there's no fuel there's no backfires.
This scheme reduces turbo lag compared to Sport mode. All the 991.2 models (even those with the 3.0L turbo engine) do this and I've read that the TT and TTs do it also.
In Sport+ Porsche leaves the throttle body open (even though you may have lifted completely off the gas) but completely shuts off fuel so that air continues to pump through the engine and out through the turbos - keeping them spinning faster in anticipation of you getting back on the throttle. Because there's no fuel there's no backfires.
This scheme reduces turbo lag compared to Sport mode. All the 991.2 models (even those with the 3.0L turbo engine) do this and I've read that the TT and TTs do it also.
07-01-2017, 01:40 AM
#24
Advanced
I did 3 Track days so far with a 92 db limit and no problem going full tilt with the Sharkwerks.
My friend with a stock GT3 RS got kicked off the track at 93 db today.