Restrictive exhausts?

BlueBrickSte · Jul 13th, 2009, 14:27

During a run on Saturday the pipe exiting the centre silencer broke on my 945 se lpt. Put the rear silencer in the boot and drove home with only a small increase in noise. What I noticed though was that the system seems to go from 2"ish to1.5/1.75". Is there a reason for this? I have adapted the centre box to exit downwards until I order a whole new system but find that the car has so much better drive out of corners and for overtaking. Has anyone out there experienced similar results with custom single box systems? Please don't reply with" It's the noise that makes it feel faster"lol. Any info appreciated

Ste

Chesh740R · Jul 13th, 2009, 14:31

Simply put the exhaust gases can escape far easier due to less restriction in the system and as your car is a turbo the less restriction allows the turbo boost to creep up from its low setting.

My 940 with the boost set to 4psi, will thanks to a full 3 inch exhaust and just one silencer box will creep upto 10psi of boost.

BlueBrickSte · Jul 13th, 2009, 14:55

10psi! You're kidding me! Looks like I'll be buying some exhaust tubing and a boost gauge

cheers, Ste

Jul 13th, 2009, 14:27	#1
BlueBrickSte Premier Member Last Online: May 8th, 2016 20:48 Join Date: Mar 2009 Location: near Wigan View Photos By: BlueBrickSte	Restrictive exhausts? During a run on Saturday the pipe exiting the centre silencer broke on my 945 se lpt. Put the rear silencer in the boot and drove home with only a small increase in noise. What I noticed though was that the system seems to go from 2"ish to1.5/1.75". Is there a reason for this? I have adapted the centre box to exit downwards until I order a whole new system but find that the car has so much better drive out of corners and for overtaking. Has anyone out there experienced similar results with custom single box systems? Please don't reply with" It's the noise that makes it feel faster"lol. Any info appreciated Ste

Jul 13th, 2009, 14:55	#3
BlueBrickSte Premier Member Last Online: May 8th, 2016 20:48 Join Date: Mar 2009 Location: near Wigan View Photos By: BlueBrickSte	10psi! You're kidding me! Looks like I'll be buying some exhaust tubing and a boost gaugecheers, Ste

Jul 13th, 2009, 14:31	#2
Chesh740R Turbobricker Last Online: May 10th, 2024 21:36 Join Date: Dec 2002 Location: Wellingborough	Simply put the exhaust gases can escape far easier due to less restriction in the system and as your car is a turbo the less restriction allows the turbo boost to creep up from its low setting. My 940 with the boost set to 4psi, will thanks to a full 3 inch exhaust and just one silencer box will creep upto 10psi of boost.

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