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What size are my BD towing Twins?

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Old 08-31-2008, 12:08 PM
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What size are my BD towing Twins?
Compressor wheel, exhaust housing, etc...
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Old 08-31-2008, 12:41 PM
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im not sure but there's 2. i think the bd twins is a s300 over an s300 57mm. wheel or the slightly larger wheel. thats what my superb was.
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Old 08-31-2008, 02:47 PM
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I'm pretty sure it's 57mm on top and 71mm on bottom.
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Old 08-31-2008, 09:12 PM
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not the tow twins, there the same
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Old 08-31-2008, 09:49 PM
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Originally Posted by cvcook
Compressor wheel, exhaust housing, etc...
When I swapped my BD tow twins to MPI twins I took a bunch of measurements since BD wouldn't give me any of this info. Details here:

https://www.dieseltruckresource.com/...d.php?t=186665

BD "Super B" secondary compressor 57 mm
BD primary compressor 65-66 mm

Basically the tow twins will only supply an air mass flow comparable to a single 66 mm turbo less some losses due to moving the exhaust gasses through a second turbo.
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Old 09-02-2008, 05:53 PM
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Thanks Stieger, that was some very useful information
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