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Old 02-08-2007, 06:24 PM   #1
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Default Removing LN3 exhaust manifold restriction=less KR?

You LN3 guys know that there'* a restriction of sorts in the rear of the LN3 exhaust manifold/header, past the oxygen sensor. Its something like a 20% reduction in the size of the exhaust. I have a couple degrees of knock retard...would removing this restriction with a die grinder or hole saw help at all?
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Old 02-08-2007, 06:29 PM   #2
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Moved out of 87-91 because you don't have anything that will even remotely compare to an LN3 in the Mechanical sections, and your KR is a direct result of the top swap.
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Old 02-08-2007, 07:49 PM   #3
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followed your monster creation a while back great work on that. I also have a LN3, there is deffinate restrictions in the manifolds(I had seen a set laying around at a friends one time), and with your setup you could deffinately use that extra flow. I will be taking mine off, and porting them. Also I am going to get them ceramic coated so they no longer look like garbage and produce less heat. I don't know if it will fix your problem but with what your running it would deffinately help. just my 2 cents anyways good luck!
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Old 02-09-2007, 12:44 AM   #4
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My bad Will, I swore I posted it in Forced Induction, but P&B is good
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Old 02-09-2007, 10:37 AM   #5
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Opening it up sure isn't going to hurt anything as long as it'* structurally ok.
Since no one else here has a ser1 L67 top swap on an LN3, no one can really say for sure if it will get rid of your KR.
It will probably help but who knows?
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Old 02-09-2007, 03:21 PM   #6
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I know I can be difficult, having the only known sueprcharged LN3, but typically, do better flowing exhaust manifolds reduce KR?
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Old 02-09-2007, 03:47 PM   #7
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That depends on how much KR you have, how bad the restriction is, and what the root cause of the KR actually is.
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