Weird Rapping Pipes - Chevy and GMC Duramax Diesel Forum
 
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post #1 of 6 (permalink) Old 06-23-2019, 07:32 PM Thread Starter
 
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Weird Rapping Pipes

So had a Stock LBZ with twin turbos and 60 over injectors. vvt turbo in valley with s475.No rapping from Y exhaust to two 4" 6' pipes at all.
Bought a Long block with built bottom (Mahl pistons .020) ,Rods, alternative Fire Cam, Ported heads, put a S366 in valley and S480 atmosphere twins, 60% injectors , free flow manifolds and ups. Now have a exhaust Rap that is scary. Only above 3000 rpm and hard load, it I let off throttle a little it stops. I do not mind the sound but afraid something is wrong cause never heard any duramax sound like this, What do you think.
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post #2 of 6 (permalink) Old 06-23-2019, 07:38 PM Thread Starter
 
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<iframe width="560" height="315" src="https://www.youtube.com/embed/UAwGcN3S11w" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
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post #3 of 6 (permalink) Old 06-23-2019, 07:41 PM Thread Starter
 
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Im trying to get it uploaded but not working. It is here on youtube .
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post #4 of 6 (permalink) Old 06-23-2019, 07:45 PM Thread Starter
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post #5 of 6 (permalink) Old 06-23-2019, 10:00 PM
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Is this the first duramax you've been around with fixed vane turbos? Sounds like the normal cackle of a duramax with a fixed vane charger.

My name is Nic
2011 GMC Sierra 2500 CCSB LML,
Lil ole single s400, fuel,
supporting mods,
rancher tuned,
Various parts from SDP, WCFAB, LDS, DHD
Wiles Diesel Performance
Woodstock, Va
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post #6 of 6 (permalink) Old 06-24-2019, 08:38 AM
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Like Nic said, and from the videos sounds normal to me. I have a s472sxe that has a good cackle to it.

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2006 Victory Red CCLB LT3 LBZ
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SDP Fully Built Trans w/ Billet Goerend G Converter
S472 SX-E.87/1.0ar sitting on a Wagler street intake W/ a twisted pedestal
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