fahr_side Posted September 20, 2014 Share Posted September 20, 2014 This is very true and something I was aware of when I was reading through some of the stickies over at NASIOC. One of the reasons I was so keen to go to an EWG is that it mentions that an EWG is even more effective in scenarios where you have a smaller turbine (TD05) with a bigger compressor (20G). An EWG is a bit of a bandaid solution to not enough hotside but it sure is better than trying to cram a TD06 (or larger!) wheel into that P18 housing! And of course nothing does smoother boost control than a properly sized EWG Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs. Link to comment Share on other sites More sharing options...
jackal8788 Posted December 25, 2014 Author Share Posted December 25, 2014 After driving my friends 2015 WRX with the STi Performance Exhaust upgrade, I decided that a little more noise may not be a bad thing if it was tasteful. I picked up a complete Borla CBE (currently installed) and will be attempting to mellow it slightly with the Vibrant Ultra Quiet resonator. For fun, I may take it to the dyno again this spring just to see what the actual gains were. VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
jackal8788 Posted April 1, 2015 Author Share Posted April 1, 2015 Planning to get back to the dyno next week just to quantify the gains from going with a full CBE as opposed to just the downpipe. I realize it will be purely informational but I would really like to know what actual improvements there are to opening up the exhaust beyond just sound/appearance and $80 is cheap data. I will also try to get both old and new dyno plots overlayed so performance impact over the RPM range can be better understood. VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
fahr_side Posted April 1, 2015 Share Posted April 1, 2015 You will get something useful. After some more tests I figured out that the Y-pipe is a bit restrictive past stg2. Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs. Link to comment Share on other sites More sharing options...
jackal8788 Posted April 1, 2015 Author Share Posted April 1, 2015 You will get something useful. After some more tests I figured out that the Y-pipe is a bit restrictive past stg2. Interesting. In my case, I may not have the most open-flowing aftermarket system because Borla goes from a 3" midpipe to 2.25" individual pipes at the 'Y'. I believe some other systems hold a 2.5" diameter at the 'Y'. VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
Rutchard Posted April 1, 2015 Share Posted April 1, 2015 two 2.25" pipes will still flow more than a single 3" pipe, should be fine. Link to comment Share on other sites More sharing options...
GTEASER Posted April 1, 2015 Share Posted April 1, 2015 Interesting. In my case, I may not have the most open-flowing aftermarket system because Borla goes from a 3" midpipe to 2.25" individual pipes at the 'Y'. I believe some other systems hold a 2.5" diameter at the 'Y'. Nameless also goes from 3 to 2.25. You really don't need anything more as Rutchard pointed out. GTEASER's 2012 Legacy GT - Sold GTEASER's 2009 XTeaser - Sold GTEASER's 1992 Legacy SS - Sold Link to comment Share on other sites More sharing options...
jackal8788 Posted April 1, 2015 Author Share Posted April 1, 2015 (edited) In order to more clearly show what mods produced what performance, I plotted my current data in Excel and added some notes. Dyno date is set for Thursday, 4/9, so I'll add that data to this graph after the session is complete. Edited April 2, 2015 by jackal8788 VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
fahr_side Posted April 2, 2015 Share Posted April 2, 2015 (edited) It's not so much the diameter of the pipes involved with the stock system, it's the way they are just squished and shoved together in the joint there... absolutely horrible. Cut your stock one open and you'll see what I mean. Schoolkids would have done better. Edited April 2, 2015 by fahr_side Obligatory '[URL="http://legacygt.com/forums/showthread.php/2008-gh8-238668.html?t=238668"]build thread[/URL]' Increased capacity to 2.7 liters, still turbo, but no longer need spark plugs. Link to comment Share on other sites More sharing options...
jackal8788 Posted April 10, 2015 Author Share Posted April 10, 2015 :spin:Unfortunately, no complete data to share just yet. We have to make a tweak to the current map and when I did the pulls yesterday, the tuner was not at the shop so we couldn't adjust the map at that time. I'm going to try again for this week VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
jackal8788 Posted April 14, 2015 Author Share Posted April 14, 2015 While obviously not complete, this is what we had for data before my engine threw a code and disallowed us from completing the dyno pulls. Overall, it does appear that the stock CBE was hindering performance as the average gains toward the peak are around 14%. Once I can get back on the dyno, I'll post a full plot but this does make me curious how the curves will finish out. VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
Blizzard Posted April 14, 2015 Share Posted April 14, 2015 What code was thrown? Link to comment Share on other sites More sharing options...
jackal8788 Posted April 14, 2015 Author Share Posted April 14, 2015 P0108 - MAP/Barometric Pressure Circuit High Input Based on the data, we tipped just over 24 PSI (target is 23.5 PSI) so that's why the code was thrown. My tuner thought that the stock CBE may have been more restrictive than he anticipated. VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
acumenhokie Posted April 14, 2015 Share Posted April 14, 2015 P0108 - MAP/Barometric Pressure Circuit High Input Based on the data, we tipped just over 24 PSI (target is 23.5 PSI) so that's why the code was thrown. My tuner thought that the stock CBE may have been more restrictive than he anticipated. Time to go 4 bar? http://perrinperformance.com/i-13324073-4-bar-map-sensor-for-2005-07-wrx-2004-15-sti.html Link to comment Share on other sites More sharing options...
jackal8788 Posted April 14, 2015 Author Share Posted April 14, 2015 Time to go 4 bar? http://perrinperformance.com/i-13324073-4-bar-map-sensor-for-2005-07-wrx-2004-15-sti.html I like this very much! VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
acumenhokie Posted April 14, 2015 Share Posted April 14, 2015 I like this very much! I have one (not sure it's this exact one) sitting in my center console. I'll be putting it in during my next tune. Link to comment Share on other sites More sharing options...
jackal8788 Posted April 14, 2015 Author Share Posted April 14, 2015 Let me know how it works for you. Are you planning to run beyond 24 PSI or is it just for a bit of margin so you're not running into the issue I am? VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
ebo03 Posted April 20, 2015 Share Posted April 20, 2015 How high does the stock MAP sensor read? Link to comment Share on other sites More sharing options...
acumenhokie Posted April 20, 2015 Share Posted April 20, 2015 Let me know how it works for you. Are you planning to run beyond 24 PSI or is it just for a bit of margin so you're not running into the issue I am? Not sure how many PSIs. Whatever the compressor map says looks good on e85. Link to comment Share on other sites More sharing options...
jackal8788 Posted April 25, 2015 Author Share Posted April 25, 2015 So it may be time to entertain the ETS external wastegate manifold. I hit 27 PSI today (which was fun) but it appears to be due to the lack of restriction in my exhaust and of course, the IWG being too small. The WDC cut to 0 in my datalog after hitting the target of 23.5 PSI, but boost creep pushed it to 27.6 PSI. Thus, we start considering the next step here. From what I've seen, those with EWG are all running the ETS manifold - true? Any comments/recommendations/suggestions would be appreciated. VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
acumenhokie Posted April 26, 2015 Share Posted April 26, 2015 Thus, we start considering the next step here. From what I've seen, those with EWG are all running the ETS manifold - true? Nope. A few people are running ETS a few people are running the Six Star one and I'm running a custom 1 off fabricated one. Link to comment Share on other sites More sharing options...
jackal8788 Posted April 26, 2015 Author Share Posted April 26, 2015 Nope. A few people are running ETS a few people are running the Six Star one and I'm running a custom 1 off fabricated one. Any more info on the Six Star option? Haven't come across that yet. VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
acumenhokie Posted April 26, 2015 Share Posted April 26, 2015 Any more info on the Six Star option? Haven't come across that yet. Read SomeZero's build thread. Post 168 or so is where it starts. http://legacygt.com/forums/showpost.php?p=4728465&postcount=168 http://legacygt.com/forums/showpost.php?p=4728465 Link to comment Share on other sites More sharing options...
jackal8788 Posted April 26, 2015 Author Share Posted April 26, 2015 Nope. A few people are running ETS a few people are running the Six Star one and I'm running a custom 1 off fabricated one. Any pics of your setup? VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
jackal8788 Posted April 26, 2015 Author Share Posted April 26, 2015 In looking at the Six Star setup, I'm not sure that I like how quickly the runners join up. The ETS looks like our stock header but with plumbing for the dual wastegates. It makes me wonder if someone who was good with custom exhaust could tie into the stock header? VF54 to 20G to VF54 to 18G build thread Link to comment Share on other sites More sharing options...
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