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Originally Posted by Dean
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Originally Posted by BAN SUVS
as to why it's actually better to put the cat in the midpipe. I do know that it functions very poorly in that location, as it's very difficult to get it up to light-off temp. Having it 6-8 inches away from the turbo, where exhaust flow whould be fairly smooth, shouldn't make a huge difference, especially when you have a bellmouth.
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Huh? A ton of NA cars have much lower ETs, and have no problems with Cats under the car.
I can't think of a single good reason to put it that close to the turbo exit generating back pressure. The only ungood reason was becasue the stupid STX rules were written so poorly originally, you had to. |
How does it create more backpressure by being closer to the turbo? Shouldn't the pressure drop be the same across the cat regardless of where it is? Or does the extra volume and additional exhaust cooling before it gets to the midpipe make some weird thermodynamic change that I don't know about?