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Location:
Vancouver
Registered:
June 2004
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Re: Turbo manifold design
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Mon, 02 August 2004 00:07
 
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matched length matters on a turbo motor just as much as it matters on a naturally aspirated motor.
BUT
as several people mentioned, if you don't have space for a bundle of tubes, then you don't have space for a bundle of tubes, in which case a matched-length header is a moot point, so you'll have to go with whatever will fit.
I know a few people with very high output road-race turbo cars where the turbo has been mounted back by the transmission to get the header sorted out correctly. This all goes back to an article in one of the "HP Books" how-to books that talked about McLaren Engine's work on the M-12 BMW 320i motors for Sillhouette Formula in the late 70's; McLaren found an extra 50+HP on top of the existing 550+HP, and most of the development work centered around exhaust manifold design for turbocharging. The really interesting thing was the article's mention of drivers' reports that turbo lag had been significantly decreased, despite the fact that the newer headers (that produced such big increased power on the dyno) had been made much much longer in primary length than the original manifold - McLaren had removed the original log manifolds after initial baseline testing, then built new matched-length headers with very long primaries, just as they would have for a N/A motor, and found big horsepower gains, and decreases in lag...
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| | Subject | Poster | Date |
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Turbo manifold design
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HighRolla | Sun, 01 August 2004 12:25 |
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Re: Turbo manifold design
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mrshin | Sun, 01 August 2004 12:34 |
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Re: Turbo manifold design
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THE WITZL | Sun, 01 August 2004 12:45 |
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Re: Turbo manifold design
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HighRolla | Sun, 01 August 2004 12:47 |
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Re: Turbo manifold design
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HighRolla | Sun, 01 August 2004 12:48 |
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Re: Turbo manifold design
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MS-75 | Sun, 01 August 2004 21:46 |
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Re: Turbo manifold design
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bbaacchhyy | Sun, 01 August 2004 21:52 |
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Re: Turbo manifold design
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510rob | Mon, 02 August 2004 00:07 |
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Re: Turbo manifold design
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HighRolla | Mon, 02 August 2004 01:14 |
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Re: Turbo manifold design
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510rob | Mon, 02 August 2004 03:08 |
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Re: Turbo manifold design
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grim boy | Mon, 02 August 2004 13:41 |
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Re: Turbo manifold design
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freakincage_com | Mon, 02 August 2004 23:30 |
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Re: Turbo manifold design
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Pewee | Tue, 03 August 2004 11:22 |
