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Originally Posted by sperry
Hot gasses do not "move faster", there is a difference between pressure and flow. Gasses that come off the motor are expanding due to their heat. If you let the gas cool, it doesn't expand as fast... i.e. you're losing some of the kenetic and thermal energy that will spin the turbo. Once the gas leaves the turbo, you don't want it to expand, because (just like a balloon) they expand in all directions. Expanded gasses after the turbo push backwards against the turbine blade, and slow them down. Ideally, you'd want hot expanding gas before the turbo and cool contracting gas after the turbo to help scavenge the gasses out of the turbo and reduce back-pressure.
http://store.summitracing.com/defaul...=egnsearch.asp |
Thats not what RRE says:
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Our DPs have a 2 1/2" stainless steel first bend with a 2 1/2" stainless steel flex section. They then expand to 3" right after the flex section right under the oil pan area. Why start out at 2 1/2"? If you are running on the stock O2 sensor housing, even ported it is 2 1/2" inside diameter. When the exhaust gasses are hot, they flow better, 2 1/2" is plenty for the first 12". As the gasses cool , bigger helps. By going to 3" after the flex section, we allow this expansion and also allow for better clearance at the front where room is tight. From there they are a full 3" back to the Apex 3" flange with 14 gauge aluminized steel piping. We had some Apexi flanges laser cut out of thick 1/2" steel for a good seal and fit.
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As far as keeping temps cool under the hood, I think I'll get some of that wally wet or whatever. Oil cooler...? And maybe a new radiator (if i can afford it) I refuise to wrap my nice, chrome IC pipes
