Restrictive exhaust
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Advanced PassionFord User
Joined: Dec 2011
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From: manchester
Restrictive exhaust
My car isnt a ford lol ive own fords though and there seems to be alot of people on here with knowledge.I have converted my volvo 850 saloon from a 2.5 20 valve to a T5 now my down pipe from the turbo is 2 1/2 inch and at the minute ive just connected it to the std 2.5 exhaust cat back and the cat back exhaust is smaller possibly 2inch or 1 1/2 .Could having the smaller exhaust on the cat back restrict how much boost i run with running down a bigger pipe into a smaller one?
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Joined: Jan 2009
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From: london
Yes, it will restrict boost pressure and prevent the turbo from spooling up quickly.
2.5" should be considered the very minimum size for that engine...You have to remember that in terms of cross sectional area a 2" exhaust isn't 20% smaller than a 2.5" exhaust as you might think, it's about 37% smaller (4.9" squared vs 3.1" squared)...That's quite a big restriction.
2.5" should be considered the very minimum size for that engine...You have to remember that in terms of cross sectional area a 2" exhaust isn't 20% smaller than a 2.5" exhaust as you might think, it's about 37% smaller (4.9" squared vs 3.1" squared)...That's quite a big restriction.
Thread Starter
Advanced PassionFord User
Joined: Dec 2011
Posts: 2,169
Likes: 4
From: manchester
Yes, it will restrict boost pressure and prevent the turbo from spooling up quickly.
2.5" should be considered the very minimum size for that engine...You have to remember that in terms of cross sectional area a 2" exhaust isn't 20% smaller than a 2.5" exhaust as you might think, it's about 37% smaller (4.9" squared vs 3.1" squared)...That's quite a big restriction.
2.5" should be considered the very minimum size for that engine...You have to remember that in terms of cross sectional area a 2" exhaust isn't 20% smaller than a 2.5" exhaust as you might think, it's about 37% smaller (4.9" squared vs 3.1" squared)...That's quite a big restriction.
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