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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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03-19-2022, 10:30 AM | #1 |
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Help me choosing between these two manifolds
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03-19-2022, 10:48 AM | #2 |
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The merge looks nicer on the bottom one but wdik?
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03-19-2022, 12:19 PM | #3 |
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Whichever has a history of preforming the best.
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03-19-2022, 12:53 PM | #4 |
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I'm not an expert on header design, but this page looks like it has a good discussion on header design considerations: https://www.enginelabs.com/engine-te...gn-and-theory/
The main difference between the 2 headers you posted looks to be the length of the primary runners. I'd suggest researching that aspect of the header design.
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03-19-2022, 01:39 PM | #5 |
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From what I've seen the longer runner style header is what gives this platform better performance - Think Ace, JDL, Nameless, P&L all longer style runners giving great numbers. I'd go for the bottom set
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03-19-2022, 01:51 PM | #6 |
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That's what I read, anyway, while the second one in all the dynos I found gives a great result at high RPM, but a little loss of torque under 3000 RPM, the first one seems the opposite.
Both use 45mm primaries. |
03-19-2022, 01:53 PM | #7 |
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UEL because it sounds like a true Subaru
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03-19-2022, 02:35 PM | #8 |
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The first one looks like the prev gen ace which was the best. It's a 4-2-1 while the bottom one is 4-1. The way the latter looks is it dissipates too much heat and hence all the insulation even below the oil sump.
I will go with the former not the latter. Sent from my SM-G781B using Tapatalk |
03-19-2022, 02:51 PM | #9 | |
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Quote:
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03-19-2022, 02:54 PM | #10 |
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03-19-2022, 02:59 PM | #11 |
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03-19-2022, 03:54 PM | #12 |
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Ehm, not my taste, it sounds like an Harley...
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03-19-2022, 04:04 PM | #13 |
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03-20-2022, 12:46 PM | #14 |
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Well the top one is HKS and it's a decent header. I'm not familiar with the bottom. But I'm sure either or will only net very little difference.
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