2.5 inch exhaust better than 3'' for below 300hp?
07-05-2003, 04:03 PM
#18
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Posts: n/a
Originally posted by dougnosser
as big of an exhaust you can fit under there, put it. The larger the better. I run a 3"mandrel bent, turbo back w/ no cat/silencer etc. The turbo will spool slightly faster with a smaller exhaust , but you will lose out on top end horsepower and increase backpreassure causing the torque to jump up as a biproduct of this.
as big of an exhaust you can fit under there, put it. The larger the better. I run a 3"mandrel bent, turbo back w/ no cat/silencer etc. The turbo will spool slightly faster with a smaller exhaust , but you will lose out on top end horsepower and increase backpreassure causing the torque to jump up as a biproduct of this.
07-05-2003, 04:42 PM
#20
Registered User
Join Date: May 2003
Location: Rochester, NY
Posts: 390
Exactly! Besides, I've been visiting spdusa.com for about 3 years, and I've talked with Mike Shields via e-mail and he is a realist. He knows his stuff, and won't sell you junk that won't help you, or you don't need.
07-07-2003, 06:26 AM
#21
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Join Date: Jun 2003
Location: New York
Posts: 173
Car Info: 2002 WRX wagon
Nice to see all of the thoughful replies. My military b/g was as an engineman/diesel USN, where turbos and s/chargers were standard equipment. Also, envision a jet engine or steam turbine engine: the highest pressure point is at the smallest aperture: as the pressure drops, the turbine blades get larger in diameter and width. (On some steam turbines I worked on, the last stage was actually under a vacuum to extract the last bit of expansion of the steam). It's same principle for air. The WRX turbo, though, has just one size essentially, so putting high pressure in and getting lowest pressure out it what makes it GO best, and Mr. Bernoulli is right!
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DashingMax
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