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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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06-02-2014, 11:39 AM | #43 |
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Why do u think oe is el???
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06-02-2014, 11:51 AM | #44 | |
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It is the ll-rr firing order, COMBINED with the unequal length header that creates the rumble. With an EL header, the collector sees evenly spaced pulses. 1 medium, 2 medium, 3 medium, 4 medium length tube (time) pulses, all evenly spaced apart=no rumble. With an Unequal length header, the collector sees 1 short, 2 short, 3 long, 4 long. Short-short, long-long, in that order creates the rumble. |
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06-02-2014, 01:57 PM | #45 |
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I like el and uel aftermarket. I've had the pleasure to run: revworks, and borla uels, and hks el.
[ame="https://www.youtube.com/watch?v=UX7hnoSkSzk"]BRZ headers and exhaust - YouTube[/ame] here's another [ame="https://www.youtube.com/watch?v=IUCjHTC7ma0"]FR-S borla headers and exhaust - YouTube[/ame]
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06-02-2014, 02:44 PM | #46 | |
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It's a combination of the flat motor and uneven length headers that makes the unique sound in boobaru's. |
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06-02-2014, 03:43 PM | #47 | |
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[ame="https://www.youtube.com/watch?v=IZBUVlbeAbU"]First s2000 with unequal length header, invidia catback sounds like subaru - YouTube[/ame] Stock subaru's are more pronounced because of how UEL the manifolds are, and because they merge right off the head, but a UEL manifold alone will make it rumble even on an inline 4 with a "normal" firing order.
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06-02-2014, 04:00 PM | #48 |
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In terms of power gains, isn't the EL "better"?
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06-02-2014, 08:43 PM | #49 |
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Properly designed and optimized an EL is better than UEL, but a crappy EL will perform worse than a quality UEL.
I know not everyone will agree, but I would love to see individual EGT and AFR for each cylinder with a UEL header, I would worry that there would be quite a discrepancy.
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06-02-2014, 11:36 PM | #50 |
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Its called "boxer rumble" because that is less syllables than "Subaru rumble" or "unequal length header rumble" ;-) who else other than Subaru and Porsche use boxer engines?? That's right, no one. And how many Porsche's rumble?? Oh yeah... None ;-)
My quality EL headers do not rumble. When I worked a Subaru we had an older STI come in with EL headers. No rumble... Sounded similar to an sr20det ;-) |
06-03-2014, 12:27 AM | #51 | |
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06-03-2014, 03:38 AM | #52 | |
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06-03-2014, 04:48 AM | #53 |
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Ferrari, Volkswagen, Alfaromeo and Citroen used to.
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06-03-2014, 05:29 AM | #54 |
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What are some good catted ELs? Looking around all I really see is JDL EL catted. Would the sound be significantly different (louder? tone?) vs stock headers?
Been looking forward a catted setup since I don't want to piss off my neigbhors.
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06-03-2014, 05:41 AM | #55 |
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06-03-2014, 09:17 AM | #56 | |
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