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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 10-21-2014, 03:42 PM   #1
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Swirl valve for KA-T

ive seen people remove it i know it has something to with better a/f mixture anyone have a thread they can show me?
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Old 10-21-2014, 05:29 PM   #2
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get a S14 upper intake manifold, swap and done.
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Old 10-21-2014, 05:31 PM   #3
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What diffrent with the s14 manifold less emmision systems? Cleaner looking? @chaluska
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Old 10-21-2014, 09:02 PM   #4
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Quote:
Originally Posted by _ivn13 View Post
What diffrent with the s14 manifold less emmision systems? Cleaner looking? @chaluska
the only difference, quite literally, is the lack of swirl valves.

that's it.

the lower manifold is a little different on the s14, but the S13 lower plenum bolts right up to the S14 upper.

S13 on left, S14 on right.

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Old 11-04-2014, 10:58 AM   #5
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what good is the scv? ive looked at it and it doesnt seem to benefit the engine other then open up at any throttle position.
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Old 11-04-2014, 11:35 AM   #6
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Nissan thought they would increase low-end torque and decrease fuel consumption by "swirling" the air/fuel mixture similar to a throttle body spacer does on old carb engines. Apparently it didn't hold up to its claims because they removed the butterfly valves on the S14 intake manifolds. Cool idea but ultimately impedes airflow.
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Old 11-04-2014, 12:09 PM   #7
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so would doing the s14 upper mani swap benefit a stock ka set up?
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Old 11-04-2014, 01:05 PM   #8
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On an S13 turbo KA setup, yes.
On an S13 NA KA setup, no.

Although I have no experience with this modification, theoretical gains will be negligible on an NA setup.
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Old 11-13-2014, 01:56 AM   #9
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its understandable that kat setups will benefit.. i wanna dig into this now.. that dam scv is tough to get to and would free up some space used for repairs
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