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09-16-2021, 09:03 PM | #51 |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
I still think that you'll have enough back pressure to benefit from this if you are going all out.
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09-17-2021, 12:30 AM | #52 |
Scooby Newbie
Member#: 366241
Join Date: Aug 2013
Chapter/Region:
South East
Location: broward county, Florida
Vehicle:2009 09 wrx delivery Dgm |
If you are going above 30 pounds of boost, you will probably see you nice big benefits. Under 25 pounds of boost I don’t think this would help as much, but it would still help. I’m thinking about doing it as well to try and get the last bit of horsepower I can out of my set up before going six speed. (Currently 400whp @15psi spring pressure)
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09-17-2021, 06:42 AM | #53 | ||
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
In general the closer to the turbine exit, the bigger the reduction in backpressure and larger gains. Putting the valve near the muffler will have much less impact than say a hood exit at the top of the downpipe.
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A G30-900 is going to have a BIG compressor and small turbine. That's backwards from what EJs like. EJs typically perform best with large turbines on a big A/R, and smaller compressors. For that turbo I would run the biggest A/R turbine you can find, especially if you're running E85 or race fuel. Small and medium turbines will chose the potential of the turbo. If these engines were like a 1.6 B16A from a Civic the argument would be different, but the EJ25 is actually large for a 4-banger and the better the exhaust breathes through the ENTIRE system, the better they perform. You'll also have better EGTs and improved low load transient response with a larger A/R |
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10-28-2021, 07:37 PM | #54 |
Scooby Newbie
Member#: 273267
Join Date: Feb 2011
Chapter/Region:
RMIC
Vehicle:2011 STi / 98 LSTi |
Doing it! With a 60mm Tial, since that's what was available.
Won't be able to do a direct before/after since fueling is being sorted, but excited anyway! |
10-30-2021, 07:06 AM | #55 |
Scooby Specialist
Member#: 57064
Join Date: Mar 2004
Vehicle:2008 STi IAG built HTA86 E85 Kel272s Cos IM |
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10-30-2021, 12:41 PM | #56 |
Scooby Newbie
Member#: 273267
Join Date: Feb 2011
Chapter/Region:
RMIC
Vehicle:2011 STi / 98 LSTi |
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11-06-2021, 11:18 AM | #57 |
Scooby Guru
Member#: 33782
Join Date: Mar 2003
Chapter/Region:
MAIC
Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
Off topic, but what is your McLaren set up? I've been consulting with a McLaren shop lately. Definitely a fun platform.
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11-06-2021, 03:50 PM | #58 | |
Scooby Newbie
Member#: 273267
Join Date: Feb 2011
Chapter/Region:
RMIC
Vehicle:2011 STi / 98 LSTi |
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Custom 200CEL Downpipes by Fern Ochoa Custom Titanium Exhaust by BlueChip here in Denver Pure Turbos Turbo Inlets Green Filters M-Engineering tune for 91/93/100oct + rolling antilag. On topic: Shop couldn't (or didn't want to??) get the wastegate and talked me into a vacuum operated cutout instead, will slap up a picture from my phone in a moment. It should open at 5psi. Which might be too early (loudness wise), but we'll see. Edit: Last edited by PotatoFlakeSTi; 11-06-2021 at 05:09 PM. |
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11-06-2021, 03:58 PM | #59 |
Scooby Newbie
Member#: 273267
Join Date: Feb 2011
Chapter/Region:
RMIC
Vehicle:2011 STi / 98 LSTi |
Speaking of which, shop owner is confident a cutout is not needed and won't make a power difference, but I insisted.
Last edited by PotatoFlakeSTi; 11-06-2021 at 05:22 PM. |
11-06-2021, 06:02 PM | #60 | |
Scooby Newbie
Member#: 273267
Join Date: Feb 2011
Chapter/Region:
RMIC
Vehicle:2011 STi / 98 LSTi |
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11-06-2021, 10:20 PM | #61 |
Scooby Specialist
Member#: 57064
Join Date: Mar 2004
Vehicle:2008 STi IAG built HTA86 E85 Kel272s Cos IM |
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11-06-2021, 11:00 PM | #62 |
Scooby Newbie
Member#: 273267
Join Date: Feb 2011
Chapter/Region:
RMIC
Vehicle:2011 STi / 98 LSTi |
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11-06-2021, 11:02 PM | #63 |
Scooby Specialist
Member#: 57064
Join Date: Mar 2004
Vehicle:2008 STi IAG built HTA86 E85 Kel272s Cos IM |
Your after dyno
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11-06-2021, 11:06 PM | #64 |
Scooby Newbie
Member#: 273267
Join Date: Feb 2011
Chapter/Region:
RMIC
Vehicle:2011 STi / 98 LSTi |
With our high reading dyno I'd expect 725whp'ish after the Fuel pump upgrade and holding better, though that's just guesswork... So I guess we'll have to see if there's a 10% gain on that.
Our turbo's are pretty comparable though Edit: turbine aside... |
11-11-2021, 04:55 PM | #65 | ||
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Member#: 33782
Join Date: Mar 2003
Chapter/Region:
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Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
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02-12-2024, 07:44 PM | #66 |
Scooby Newbie
Member#: 420458
Join Date: May 2015
Location: Australia
Vehicle:07 WRX STI Urban Grey |
Any issues in the long term with this mod? Also quick question, any reason you chose the 69s turbine wheel when you upgraded to this turbo?
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03-12-2024, 08:51 PM | #67 |
Scooby Specialist
Member#: 57064
Join Date: Mar 2004
Vehicle:2008 STi IAG built HTA86 E85 Kel272s Cos IM |
This bypass still working flawlessly 4 years later went with the 69S wheel for more flow at the top end. The Xona turbo still working well with more than 50k miles on it pushing 40psi daily
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