Anyone running one of these on their stock motor 15/16 STI? I'm just looking for opinions from guys that have tried one on a current gen. I would like to keep my car a daily driver and already planned to go stage 2 with my build in a few months.
Anyone running a COBB TD05H-20G Turbo on their 15/16?
TurboSVT
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As my tuner says... It's all about the tune.
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I hear ya, and as my tuner says (Calvin @ Cobb Plano - one of the best in the country) he would stay away from 400+ HP/TQ on stock internals.
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Is Calvin the one with a little bit of an accent and drives the Black '04 STi?
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I have the Cobb 20g, was first one to get it installed right after they introduced it along with their larger injectors and fuel pump. I LOVE it, getting equal or better mpg when off of it, and tons more power. i will say there is more lag without a doubt, but i just drive it as two cars now, when wanting to have an economy car, can get 24-25 mpg staying in the 2k-3k rpms area....but when keeping in the higher rev the larger turbo REALLY wakes up, very nicely.
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Not sure. There's a guy there named Neal with a British accent, and I think he drives an older STi.
I don't remember an accent with Calvin, and when I was there he was driving a primered 70's or 80's Chevy pickup that about knocked down the walls with it's rumble.
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I thought bigger turbos and more lag go hand-in-hand? An ideal scenario would be "near" stock spool, but never equal.
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Then I'd love to see your list of larger turbos that spool as faster, or faster, than the stock turbo.
If I can find a larger turbo that spools-up faster and at a lower RPM than the stock turbo, and makes significantly more power, then I may forego E85.
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Largely, you're going to do the research yourself. I just showed a comparison of two cars I tuned (one being mine) with the exact same mods except for the turbo and they spooled pretty much identically.
However, I suggest reading this entire thread: Next Gen is here: Full-Race/Borg-Warner EFR7163 in stock location. 440whp/443wtq - NASIOC
You'll have a hard time, if at all finding a turbo to spool faster than what a stock turbo is capable of, and be larger. Subaru's have too much exhaust pipe from the head to the turbo. If you're willing to bring the turbo closer to the heads, you can go larger and larger without a huge sacrifice on spool (compared to stock) until you go very large.
However, I suggest reading this entire thread: Next Gen is here: Full-Race/Borg-Warner EFR7163 in stock location. 440whp/443wtq - NASIOC
You'll have a hard time, if at all finding a turbo to spool faster than what a stock turbo is capable of, and be larger. Subaru's have too much exhaust pipe from the head to the turbo. If you're willing to bring the turbo closer to the heads, you can go larger and larger without a huge sacrifice on spool (compared to stock) until you go very large.
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So it's not simply in the tune, but physical changes as well.
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Are the end tanks shaped differently?? Can still be smaller as far as the fin area yet end tank shape could cause interferance?
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Dom 1.5 XTR has shown to give 100 horsepower gain at redline with no loss of spool time over the stock turbo in some simple bolt on combo's.
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The GD intercooler does not hang over the turbo as far as the GR/GV.
From Cobb in the last 9 hours:
![Image]()
I'm willing to bet that the coolant pipe that goes over the turbo is the problem.
Cobb also doesn't confirm this on a 2015 STi, but someone has it working.
Cobb TDO5H 20G - 8cm Turbo Review - NASIOC
Here is what I did to get my Blouch 20G/TD05/8cm to fit:
![Image]()
From Cobb in the last 9 hours:
I'm willing to bet that the coolant pipe that goes over the turbo is the problem.
Cobb also doesn't confirm this on a 2015 STi, but someone has it working.
Cobb TDO5H 20G - 8cm Turbo Review - NASIOC
Here is what I did to get my Blouch 20G/TD05/8cm to fit:
Attachments
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118 Posts
Must have been Neal, he was the one that repositioned my Cobb exhaust so that is squared up. Its nice to have a hydraulic lift handy!
Really nice guy, we got to talking about corporate Cobb's idea of stage 3 versus what they recommend in Plano for Stage 3. The big difference is that Plano recommends this turbo or one similar to it when you go to Stage 3 as well as everything else that comes with it. They saw much more reliable and sustainable power gains once you switched out the turbos.
Something to consider when I decide to go that route.
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