dahoseman Posted April 27, 2013 Share Posted April 27, 2013 I was daydreaming a bit about a twin-scroll setup and looked up a few things. I ran across 1.5 scroll headers that separate exhaust pulses until the turbo to supposedly increase the efficiency standard single scroll turbos. Does anyone have any data or experience with these? Link to comment Share on other sites More sharing options...
Nrw Posted April 27, 2013 Share Posted April 27, 2013 I plan on switching to them. We've had great results with the Invidia version on the dyno. I think they sound neat too. Link to comment Share on other sites More sharing options...
dahoseman Posted April 28, 2013 Author Share Posted April 28, 2013 So it's not just a gimmick? It seems to make mechanical sense, but there are a lot of things that should make have a result that don't and vice versa. That sort of results have you seen or observed? What difference is attributable to the headers? Link to comment Share on other sites More sharing options...
Nrw Posted April 29, 2013 Share Posted April 29, 2013 Loads more torque and midrange. Here's a comparision on 2 2011 STI's. Blue line has injectors because of future plans to run E85. Both do have 3ports, just ran out of room on the line. Same tuner, same dyno. Different days. http://www.brentuning.com/dyno/graph.php?gb=0&hp=1&torque=1&boost=1&rpm=1&sl=1&sln=1&sat=0&cb=0&dgr=1&smm=0&sg=1&runid1=117&rgb1=000000255&runid2=104&rgb2= Link to comment Share on other sites More sharing options...
dahoseman Posted April 29, 2013 Author Share Posted April 29, 2013 Thanks for the data. Wow, that is significant. I first ran across the cheap Ebay setups, which got me thinking about it. However, I didn't realize that the "legit" headers run in the $2K range. Yikes. I think it's going to have to remain a daydream for now. I think if I made the monetary commitment to go that far for headers, I would probably just go all the way with a full twin scroll setup. But.... just an idea for now. Link to comment Share on other sites More sharing options...
dahoseman Posted April 30, 2013 Author Share Posted April 30, 2013 How much better is the 1.5 scroll header vs. a typical equal length header? Link to comment Share on other sites More sharing options...
Nrw Posted April 30, 2013 Share Posted April 30, 2013 IIRC the Tomei header that was on the redline car was their ELH. Link to comment Share on other sites More sharing options...
Berzerklo Posted April 30, 2013 Share Posted April 30, 2013 It is most certainly not a gimmick. Almost all of the JDM STis/Specs ect all come with twin scroll set up. Not only is it different headers compared to stock, but it requires a twin-scroll turbo to function with the new plumbing. http://image.modified.com/f/16322612+w750+st0/modp-0906-03-o-twin-scroll-diagram.jpg One of my friends put a JDM 2.0 STi twinscroll setup in his 2002 WRX wagon years back and I too have been dreaming about a similar set up ever since I got to ride in it. Talk about midrange! That thing could spool in a second. Though I will probably never be able to afford it, a man can dream! Link to comment Share on other sites More sharing options...
dahoseman Posted April 30, 2013 Author Share Posted April 30, 2013 Oh, I know true twin scroll is legit. There are several compromise options for single scrolls that add 'some'of the twin scroll benefits. I was wondering if 1.5 scroll headers that dump separate exhaust pulses directlly into the turbine of single scroll turbos are noticeably more beneficial than an equal length header which also separates exhaust pulses, but dumps into a collective (standard) up pipe of a normal single scroll turbo? Link to comment Share on other sites More sharing options...
dahoseman Posted May 1, 2013 Author Share Posted May 1, 2013 I guess I'm mostly asking if these two headers would give noticeably different results in spool, power, performance? 1. Full 1.5 scroll separated until turbo http://www.invidia-usa.com/Products.aspx?ProductID=242 2. Equal Length header merging into normal up pipe http://www.invidia-usa.com/Products.aspx?ProductID=252 Link to comment Share on other sites More sharing options...
Berzerklo Posted May 1, 2013 Share Posted May 1, 2013 Oh, I know true twin scroll is legit. There are several compromise options for single scrolls that add 'some'of the twin scroll benefits. TIL. I did not know this was a thing... Interested to see if there is anyone with experience that will chime in. Link to comment Share on other sites More sharing options...
dahoseman Posted May 1, 2013 Author Share Posted May 1, 2013 I didn't know it was a thing either until a guy offered to sell me his header from a wrecked car. Seems to make mechanical/physics sense, so I'm curious what (if any) benefit it would offer and if it's worth it. I would still love to have an actual twin scroll setup, though.... haha..... but I'm not about to dump that amount of money and time into an 8 year old daily driver. Link to comment Share on other sites More sharing options...
06silvarubiLGT Posted May 1, 2013 Share Posted May 1, 2013 http://forums.nasioc.com/forums/showthread.php?t=2495817&highlight=1+5+scroll problem solved or get the original http://forums.nasioc.com/forums/showthread.php?t=2485467&highlight=1+5+scroll Link to comment Share on other sites More sharing options...
Nrw Posted May 1, 2013 Share Posted May 1, 2013 Battlegrounds tend to fail or not fit right. No issues with the fullrace or Invidia version that I've heard of. Link to comment Share on other sites More sharing options...
Berzerklo Posted May 2, 2013 Share Posted May 2, 2013 For those of you that are too lazy to follow the links to NASIOC (Same Car/setup, just stock STi headers vs Full Race 1.5 Scroll Headers): http://i6.photobucket.com/albums/y207/Pisadong/Fullraceversusstock.jpg Car is: 08 STi Built shortblock (JE pistons, Carrillo rods, ACL bearings) Ported stock heads STOCK cams and valvetrain ATP GT35R stock location turbo Custom FMIC Custom CAI Deatschwerks 850 injectors Walbro 255 AP V2 Pretty nice results there, though the Full Race Headers are too much money for me at the moment. Link to comment Share on other sites More sharing options...
mwiener2 Posted May 2, 2013 Share Posted May 2, 2013 Look at plots that have stock vs EL headers, and then stock vs 1.5 headers. They probably look the same.... My Mods List (Updated 8/22/17) 2005 Outback FMT Running on Electrons Link to comment Share on other sites More sharing options...
JMLegacy Posted September 16, 2013 Share Posted September 16, 2013 Yeah, Unabomber said 1.5 scroll hasn't been proven to outperform other designs. http://forums.nasioc.com/forums/showthread.php?p=40600496 EL headers will net you some gains up top. UEL spools quicker so more is seen down low. EL shifts torque curve to the right, not really nice for a daily driver. But I've heard that on low boost it's the opposite. Go figure. Link to comment Share on other sites More sharing options...
xtea Posted November 8, 2015 Share Posted November 8, 2015 I guess I'm mostly asking if these two headers would give noticeably different results in spool, power, performance? 1. Full 1.5 scroll separated until turbo http://www.invidia-usa.com/Products.aspx?ProductID=242 2. Equal Length header merging into normal up pipe http://www.invidia-usa.com/Products.aspx?ProductID=252 Reviving an old thread because this question is pertinent to me right now. Link to comment Share on other sites More sharing options...
mwiener2 Posted November 8, 2015 Share Posted November 8, 2015 Read the thread instead of bumping it. My Mods List (Updated 8/22/17) 2005 Outback FMT Running on Electrons Link to comment Share on other sites More sharing options...
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