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Originally Posted by Ragnarock01
I know that having longer exhaust headers can net more horsepower, since the pulses line up and have more space to sort them selves out and prevent gasses from another exhaust port from pushing into it's neighbor, but I haven't been able to find any good arguments about having the turbo on top or on bottom.
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Touche. My thinking is along the lines of your next sentence- longevity as well. Sure turbos are meant to see heat but within reason. Too much heat is just too much heat and can lead to failure especially with smaller turbos that are fire crotches to begin with. My thoughts and I'm sure that I could probably a paragraph or two somewhere about this are that you need that heat as well as volume to give an adequate spool....but ultimately still want to get that heat out of the exhaust side (the scroll itself) as much as possible. Sure they're designed to be beat on but too much is too much and that goes for anything. You could apply that to bowls of cereal if you wanted to.
I know you've looked at the stock ex man when it's been beat on and you lift up the hood on a dark night. You could light a neighborhood with the orange glow alone. Now look at some badass turbo setups on youtube : IE engine out of the car and on a dyno test stand. The piping glows under load (boost) but off boost quickly cools down again. This is an example of some badass designing by people who actually care to be that anal and do the job right. Thats my only point really. I live in California and it's pretty hard if not completely impossible to drive around with something badass and not want to beat on it. The problem is the fines if you're caught. I know why I havent done anything really radical with my MX6 and thats a big part of it right there. But for some of you other guys...why not?
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Originally Posted by Ragnarock01
I can see what you mean about the heat though now that I think about it more. At least if the pipes curve down first, that rising, radiated heat stays around the turbo rather than floating above it with a bottom-mount.
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Yeah it just sits there more or less. With a large turbo fine..you want some heat to keep velocity up. But with a small turbo or even some of the T3's here..the stocker is really all you need. Big turbos like the Holsets need help whenever they can get it. I dont know, we'll see I guess.
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Originally Posted by Ragnarock01
I would love to see some definitive numbers on this; a comparison between a top and bottom mount manifold with equal-length runners would be the best, but I can't find any tests like that (so far).
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I have tons of books and I'm sure that if I dug deep I could find something somewhere. I want to find a reliable source though. I'm off this entire weekend so....I'll have something definative either way.
