turbo exhaust housings & wastegates

turbo exhaust housings & wastegates

03-24-2005, 04:11 PM

#1 (permalink)

Beast2B

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Join Date: Sep 2001 Location: Sacramento, CA Posts: 1,183 Old Reader's Rigs Gallery

turbo exhaust housings & wastegates

Ok turbo gurus, I have been thinking again and my brain hurts. Here’s the question (with a few qualifications up front):
• All of the B1 turbos have the same compressor and housing,
• All of the B1 turbos are optimum at 46-48# boost with near 1:1 PR,
• I am externally waste gated (soon, and may go twins later) and it would be nice to change as few parts as possible!
• A kwik-spool exhaust housing will get to 46# boost sooner that a full B1 exhaust housing,
Now the question: Why would anyone use an exhaust housing larger than the KS housing when you can spool quicker to 46#, bypass any additional exhaust with the waste gate, and have less rotating mass because of the smaller turbine wheel? What is the downside to this equation?
I always read that the larger turbo exhaust housings have better top end versus the smaller housing’s spool-up, but if both turbos are most efficient at the same boost then top end should be the same **IF** they are wastegated to the same max boost.
OK, LET ME HAVE IT!!!

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Galen Porter

2010 2500 4x4 CCSB auto: Smarty Jr67, Reunel rear bumper, Reunel front & Warn PowerPlant winch in progress
2001 2500 HO QC 4x4...sold
2012 VW Golf TDI super commuter

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