UEL Header Development - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

86drift · 07-30-2012, 05:10 AM

I'm about to start on development of UEL headers and thought I'd get people's opinions.
This is not a debate about UEL vs EL (I'll be making those also) or about hp (I plan to dyno against EL to get a direct comparison). It's purely about the sound.

Which make the better off-beat rumble?
4-1

or

4-2-1 (single cross pipe)

BRAWL · 07-30-2012, 05:53 AM

UEL = Better sound as a general concensus

Not overly biased as a there is a lot that goes into getting 'the best' exhaust noise. in the end it is purely personal preference.

Will want to see hp gains and hear good quality audio/video of it to make my mind up before commiting

Panman · 07-30-2012, 05:56 AM

Planning for it to be street legal in Aus?

86drift · 07-30-2012, 09:02 AM

Quote:

Originally Posted by Panman

Planning for it to be street legal in Aus?

I will do a street legal version.

Would be good to hear from anyone from the Subaru world that has experience with UEL headers and which headers make the most noticeable Subaru rumble.

bimmerboy · 07-30-2012, 10:25 AM

The oem USDM wrx/STi have a 4-1 which produces a mean rumble...

Actually curious to know as well if a 4-1 UEL sounds any different than a 4-2-1. I suspect the main cause of the "off-beat" rumble is due to the difference in length of the primaries. The larger the difference in length, the more "off-beat rumble" there is

Admiral Ballsy · 07-30-2012, 10:41 AM

From a fluid dynamics perspective, the 'most rumble' would come from manifold-style designs where both cylinders on a head dump into a single tube. So something like a really short Y-configuration on each side.

See http://www.ft86club.com/forums/showthread.php?&p=308426

Admiral Ballsy · 07-30-2012, 11:46 AM

Quote:

Originally Posted by 86drift

Of the two, definitely this one since each bank's cylinders are combining prior to 'final mixing'.

86drift · 07-30-2012, 07:20 PM

Thanks guys. The header work will start tomorrow.

I'll post video of the sound when I get something sorted.
Also dyno results, as no one will want to loose power.

Tainen · 07-30-2012, 07:31 PM

well the stock headers are UEL. But the angle and design is different than the traditional EJ headers... so I am guessing the shape/angle is what is causing the rumble sound. So I'd try to make it look like the stock EJ headers as much as possible, more 90 degree bends instead of 180 degree bends.

Boxer-Guy · 07-30-2012, 08:51 PM

will this be for stock exhaust application or for a 3" pipe ?

thermobox · 07-30-2012, 08:58 PM

Super sick! Can't wait to see if we can have our boxer sound back!

86drift · 07-30-2012, 10:09 PM

Quote:

Originally Posted by Tainen

well the stock headers are UEL. But the angle and design is different than the traditional EJ headers... so I am guessing the shape/angle is what is causing the rumble sound. So I'd try to make it look like the stock EJ headers as much as possible, more 90 degree bends instead of 180 degree bends.

Can you direct me to pictures of the EJ Headers? All Google wants to give me is pictures of aftermarket headers

Quote:

Originally Posted by Boxer-Guy

will this be for stock exhaust application or for a 3" pipe ?

This will be a bolt-in to match the stock exhaust.

knapper · 07-30-2012, 10:21 PM

I know it's not the stock header, but this is pretty much it:

knapper · 07-30-2012, 10:22 PM

The stock header is on the bottom. From an WRX.

07-30-2012, 05:10 AM	#1
86drift Join Date: Jun 2012 Drives: Toyota 86 GT Location: Sydney, Australia Posts: 517 Thanks: 85 Thanked 263 Times in 147 Posts Mentioned: 24 Post(s) Tagged: 0 Thread(s)	UEL Header Development I'm about to start on development of UEL headers and thought I'd get people's opinions. This is not a debate about UEL vs EL (I'll be making those also) or about hp (I plan to dyno against EL to get a direct comparison). It's purely about the sound. Which make the better off-beat rumble? 4-1 or 4-2-1 (single cross pipe)

07-30-2012, 07:31 PM	#9
Tainen Senior Member Join Date: Nov 2011 Drives: First SWP BRZ-L Location: Washington Posts: 809 Thanks: 154 Thanked 350 Times in 174 Posts Mentioned: 11 Post(s) Tagged: 0 Thread(s)	well the stock headers are UEL. But the angle and design is different than the traditional EJ headers... so I am guessing the shape/angle is what is causing the rumble sound. So I'd try to make it look like the stock EJ headers as much as possible, more 90 degree bends instead of 180 degree bends. __________________ First white BRZ in the country Limited SWP BRZ, 35% tint, clear bra, Nameless Performance downpipe, axelback, headers

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07-30-2012, 05:53 AM	#2
BRAWL Senior Member Join Date: Jul 2012 Drives: Toyota 86 GTS Velocity Orange Location: Perth, Australia Posts: 447 Thanks: 74 Thanked 102 Times in 64 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	UEL = Better sound as a general concensus Not overly biased as a there is a lot that goes into getting 'the best' exhaust noise. in the end it is purely personal preference. Will want to see hp gains and hear good quality audio/video of it to make my mind up before commiting

07-30-2012, 05:56 AM	#3
Panman Senior Member Join Date: Jun 2012 Drives: 86 GTS Location: Brisbane Australia Posts: 706 Thanks: 141 Thanked 275 Times in 176 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	Planning for it to be street legal in Aus?

07-30-2012, 10:25 AM	#5
bimmerboy Senior Member Join Date: Mar 2012 Drives: 2009 135i Location: Midwest Posts: 283 Thanks: 126 Thanked 74 Times in 43 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	The oem USDM wrx/STi have a 4-1 which produces a mean rumble... Actually curious to know as well if a 4-1 UEL sounds any different than a 4-2-1. I suspect the main cause of the "off-beat" rumble is due to the difference in length of the primaries. The larger the difference in length, the more "off-beat rumble" there is

07-30-2012, 07:20 PM	#8
86drift Join Date: Jun 2012 Drives: Toyota 86 GT Location: Sydney, Australia Posts: 517 Thanks: 85 Thanked 263 Times in 147 Posts Mentioned: 24 Post(s) Tagged: 0 Thread(s)	Thanks guys. The header work will start tomorrow. I'll post video of the sound when I get something sorted. Also dyno results, as no one will want to loose power.

07-30-2012, 08:51 PM	#10
Boxer-Guy Member Join Date: Apr 2012 Drives: Not Yet Location: USA Posts: 17 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	will this be for stock exhaust application or for a 3" pipe ?

07-30-2012, 08:58 PM	#11
thermobox Senior Member Join Date: Feb 2012 Drives: 16 Impreza 5dr CWP Location: Baltimore, Md Posts: 332 Thanks: 5 Thanked 94 Times in 61 Posts Mentioned: 11 Post(s) Tagged: 0 Thread(s)	Super sick! Can't wait to see if we can have our boxer sound back!

07-30-2012, 10:21 PM	#13
knapper Senior Member Join Date: Jul 2012 Drives: '13 Scion FR-S - Whiteout Location: Canada Posts: 143 Thanks: 118 Thanked 58 Times in 40 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I know it's not the stock header, but this is pretty much it:

07-30-2012, 10:22 PM	#14
knapper Senior Member Join Date: Jul 2012 Drives: '13 Scion FR-S - Whiteout Location: Canada Posts: 143 Thanks: 118 Thanked 58 Times in 40 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	The stock header is on the bottom. From an WRX.

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