Do you have a electric exhaust controller? - Question for you.

bugeyes · 12-06-2005, 05:38 PM

I'm referring to the electrically controlled butterfly valve in the exhaust pipe that is used to silence a noisy exhaust and then it can be opened for more noise and power by a remote switch.

Question is-
If you have one of these when the valve is shut (in quiet mode), does it affect the spool up of the turbo?
There are two possibilites here. One is the increased backpressure will allow the engine to create more torque off boost and spool faster, the other is increased backpressure will stop the turbo spooling faster.
Feedback please.........

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J-Rex2004 · 12-06-2005, 05:44 PM

When its closed you will spool slower than with it open. With it shut your exhaust performs as normal. You answered your own question really.

InfamousDX · 12-06-2005, 07:16 PM

Exhausts spools slower when cutout is closed... proven fact from my UTEC logs.

bugeyes · 12-06-2005, 08:52 PM

Quote:

Originally Posted by InfamousDX

Exhausts spools slower when cutout is closed... proven fact from my UTEC logs.

Could you put an rpm figure on that since you can log. Whats tha difference in spool.
Thanks.

InfamousDX · 12-06-2005, 09:30 PM

Sorry I dno't have my logs (reformatted comp)... but it was about a ~250 rpm difference.

12-06-2005, 05:38 PM	#1
bugeyes Scooby Specialist Member#: 64494 Join Date: Jun 2004 Location: Australia Vehicle: 2001 V7 sti	Do you have a electric exhaust controller? - Question for you. I'm referring to the electrically controlled butterfly valve in the exhaust pipe that is used to silence a noisy exhaust and then it can be opened for more noise and power by a remote switch. Question is- If you have one of these when the valve is shut (in quiet mode), does it affect the spool up of the turbo? There are two possibilites here. One is the increased backpressure will allow the engine to create more torque off boost and spool faster, the other is increased backpressure will stop the turbo spooling faster. Feedback please......... * Registered users of the site do not see these ads.

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12-06-2005, 05:44 PM	#2
J-Rex2004 Scooby Specialist Member#: 68490 Join Date: Aug 2004 Chapter/Region: TXIC Location: Spring Vehicle: '04 tippin' on fo'fo jackstands.	When its closed you will spool slower than with it open. With it shut your exhaust performs as normal. You answered your own question really.

12-06-2005, 07:16 PM	#3
InfamousDX * Banned * Member#: 25413 Join Date: Sep 2002 Chapter/Region: Tri-State Location: North NJ	Exhausts spools slower when cutout is closed... proven fact from my UTEC logs.

12-06-2005, 09:30 PM	#5
InfamousDX * Banned * Member#: 25413 Join Date: Sep 2002 Chapter/Region: Tri-State Location: North NJ	Sorry I dno't have my logs (reformatted comp)... but it was about a ~250 rpm difference.