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Loss of torque

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Loss of torque
Old April 25th, 2018, 01:36 AM   #1
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Loss of torque

I have a 02 GTS. I have Borla Cat Back and Roe Racing Hi-flo cats. I noticed that when i replaces the factory Cats with the high flow cats, I lost some torque. I’ve been told if i upgrade the headers , I’ll gain that torque that I lost. Anyone have any input if this is true? Thanks
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Old April 25th, 2018, 05:02 AM   #2
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Dyno comparison of before and after exhaust install? Typically on a naturally-aspirated setup, if you remove the muffler's you lose a lot of torque because of not having any back pressure.

The only exception to this is with a turbo setup as the hot side of the turbo acts like a muffler and also determines the torque curve depending on it's A/R size.
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Old April 25th, 2018, 11:48 AM   #3
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Maybe it feels like a loss of torque (but not really) because the RPM's are climing faster now with your current set up. I removed my cats on my 2004 and notice any losses in power or torque, different motor I understand. I had a 1997 GTS with no cat with no loss in torque/power in it either.
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Old April 25th, 2018, 11:54 AM   #4
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You must have a finely calibrated butt dyno.
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Old April 26th, 2018, 12:24 AM   #5
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Quote:
Originally Posted by Viper4Christ View Post
Dyno comparison of before and after exhaust install? Typically on a naturally-aspirated setup, if you remove the muffler's you lose a lot of torque because of not having any back pressure.

The only exception to this is with a turbo setup as the hot side of the turbo acts like a muffler and also determines the torque curve depending on it's A/R size.
Wrong. Removing back pressure does not hurt engine performance.
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Old April 26th, 2018, 04:26 PM   #6
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Quote:
Originally Posted by b3rndtt0ast View Post
Wrong. Removing back pressure does not hurt engine performance.
Removing all back pressure with a full straight pipe setup certainly drops torque down a bit and I've seen it on multiple NA setups over the years regardless of the manufacturer.

Years back, I was helping a buddy with an exhaust system swap and we tested his setup with and without high-flow mufflers. Mid range power fell off completely in the straight-pipe configuration and after reinstalling the mufflers, it came right back.

Engine Masters has a few videos on the subjust and the lowest power output combo always ends up being the zoomie or straight pipe setup.
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Old April 26th, 2018, 04:29 PM   #7
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Take a look at dyno runs for Roe cars. Cars with no cats always make more torque than those with high flows or stock cats.









<-------- 660rwhp/710rwtrq with no cats, headers and full 3" track exhaust.





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Old April 26th, 2018, 10:52 PM   #8
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Quote:
Originally Posted by Viper4Christ View Post
Quote:
Originally Posted by b3rndtt0ast View Post
Wrong. Removing back pressure does not hurt engine performance.
Removing all back pressure with a full straight pipe setup certainly drops torque down a bit and I've seen it on multiple NA setups over the years regardless of the manufacturer.

Years back, I was helping a buddy with an exhaust system swap and we tested his setup with and without high-flow mufflers. Mid range power fell off completely in the straight-pipe configuration and after reinstalling the mufflers, it came right back.

Engine Masters has a few videos on the subjust and the lowest power output combo always ends up being the zoomie or straight pipe setup.
Loss of velocity kills torque. Not back pressure.
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Old April 26th, 2018, 11:23 PM   #9
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I feel a fluid dynamics discussion will pop up in 3....2....1
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Old April 27th, 2018, 10:53 AM   #10
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Quote:
Originally Posted by Red Snake View Post
Take a look at dyno runs for Roe cars. Cars with no cats always make more torque than those with high flows or stock cats.



<-------- 660rwhp/710rwtrq with no cats, headers and full 3" track exhaust.
Right, cat removal opens up exhaust flow to help increase power. I was referring specifically to mufflers and how a quality built high-flow muffler in a S/C or N/A setup helps to maintain mid-range power, excluding turbo setups.
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