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Originally Posted by Ilow
I have to disagree with this. First, the turbo does not generate much excess heat due to most turbos having water and/or oil jackets to cool them, and second, the gas is heated when it exits the turbo due to the friction created by the air being compressed, but then it is usually cooled by an intercooler before it enters the intake. It is possible that because of the air/fuel mix that Willravel refers to is being increased due to the turbo compressing the air the exhaust might be a little hotter, but I think that the overall effect of a turbo on exhaust heat is negligible.
edit: I appreciate the info, Will, but am curious as to what prompted this explosion of information.
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Good info but wrong side of the turbo although oil does cool the turbo.
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That's why you get a bigger turbo :wink: I know that on my 95 Eclipse with a 2.4L stroker motor and a 60-1 turbo my exhaust gas temperature at 7000 rpm on a WOT run gets up to about 1500 degrees at my probe, which is about 5" from the head. On my friend's N/A honda his probe in the same spot gets to about 1200 degrees in the same conditions.
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You've seen the proof and it's irrefutable regardless of what ever overboost may say (can't always believe what you read). I stand by my statement added backpressure leads to added EGT (Exhaust Gas Temp) and a turbo adds backpressure and some heat of it's own otherwise no one would sell EGT gauges to people with turbos. The other thing wrong is the statement "Unfortunately, we know of no accurate way to calculate optimal exhaust pipe diameter." It's wrong because it's done by engineers, exhaust fabricators, and some car buffs all the time. There are formulas, just because overboost or anyone else doesn't know them or bother to use them doesn't mean they don't exist.
Just because it ends in .com doesn't make it any more reliable a source than hear-say.