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Old 04-04-2019, 12:21 PM   #51
shemoves
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Quote:
Originally Posted by rexblake View Post
Just put a 20g on and be done with it. If it makes too much power you can always turn it down. Remember, a big turbo on low boost is better than a smaller turbo on high boost. Less heat, more efficient, lower rpms of the turbo, it's really all benefits for larger turbo and lower boost. And if you get bored you can always bump up the boost. Plus, it spools fast going to low boost.

Here's a ball bearing, billet, td06 optioned 20g.

http://shopping.kinugawaturbo.com/ki...1-1-2-4-1.aspx
I've heard mixed reviews of the kinugawas. I'd rather sacrifice power/spool than reliability. That said, I fully agree with slightly larger turbo not working hard vs smaller turbo maxed out.

Quote:
Originally Posted by Exit 37 View Post
I have an Arashi Dynamics TD05H-18G 7cm turbo with full bolt ons, STI TMIC, 700cc injectors, CA 91 gas, and I'm pushing 318whp/323wtq at 20psi until redline tuned by Clark Turner Tuning. I have 196k miles on the stock block. My IDC is 70% at WOT. I can definitely push more if I wanted to but I just wanted to break the 300whp barrier. I hit full boost by 3200RPM and it comes on STRONG. It's a blast to drive.
i know your CR helps, but this is good info. thanks.
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Old 04-04-2019, 02:39 PM   #52
Winterhawk
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Quote:
Originally Posted by shemoves View Post
With a new stock block STi (2005), what turbo would make 320whp (+/- 10) on 91 octane and a safe tune? I prefer ball bearing, and am willing to spend more for quality/reliability.
Opinions on what turbo is best is like certain body parts, everyone has one. My opinion is read the info shown on the following link first regardless of what you choose. There's so much excellent information written by enthusiasts who are also engineers. Bottom line, know exactly what you want based on your driving needs or you can make a very expensive and frustrating selection. I personally have been playing and working with turbo systems for decades and there is too much misinformation on this subject not to educate yourself first before making a decision. https://www.garrettmotion.com/racing...ct_Day1Garrett
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Old 04-04-2019, 07:20 PM   #53
Dave D.
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20gxtr JJ tuned

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There really isn't any lag when your 20g-xtr runs through that STi short first gear. Nor with a Dom 1.5xtr. I've run both on the same motor. Still have the 20g-xtr in a box, it's been rebuilt and just sitting there. Not sure I want to sell it, but it would cost you less than a new one.
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Old 04-04-2019, 08:11 PM   #54
dingobite
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Breaking in my new shortblock im hit 17psi at 4500 with the 2.5xtr i dont feel any lag out side the fuel stumble even with the cobb kit installed< one of the nastiest stumbles subaru ever gave to anyone. I can still cruise around with out flooring it having no complaints to a few other turbos ive drove, dont ever install a steam a year later without testing it.

id also consider a BCP X500 before certain other brands its a low cost 20g.

Im rebuilding the last shortblock later while it can be saved still took 13k miles to see the leaky headgasket antifreeze was getting into my oil somehow.
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Old 04-12-2019, 09:40 PM   #55
garygbnj1
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2010 lgt. 305 whp with stock turbo.
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Old 04-13-2019, 12:27 PM   #56
StarkWRX
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There were several good things said, but I wanted to encourage you to study a little bit more.
Everyone can suggest their favorite turbo/mods, but only you can know what exactly you want.

I’m in the process of getting the maximum out of my stock TD04-13T and for that you need to be able to understand the compressor map.

https://images.app.goo.gl/RELBaFerYD3jhSBHA

Not every turbo has a map but if you understand how they work, then you will be able to choose a turbo design, and just ask for manufacturer recommendations.

To reiterate, buying any turbo is not a “waste” but your money might be better spent elsewhere.

I also agree the stock turbo inlet is a bit restrictive and disintegrates around 100K miles.

Next, you can put any turbo on your stock engine.... but as another member said, you don’t have to run at 20 psi. In general a bigger turbo at lower pressure flows better than a smaller one at high pressure BUT you need the compressor map to make sure you’re still inside the efficiency boundaries. Let me know if you need help understanding the maps.

Last, it “seems” stock internals are good up to 400 HP, but then again, if you drive full boost all the time, they will not last 100K miles. I used to be on a 93 oct 17 psi map, and would lift off the throttle at 14-15 psi... so now I just drive with an economy map around 8psi. It still boosts to 15psi at WOT. I do my own tunes.

I’ve been on these maps for 60,000 miles and everything looks good.
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Old 04-13-2019, 12:28 PM   #57
StarkWRX
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Now my turn to jump on the band wagon....

Has anyone used Tomei turbos? Thoughts?
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Old 04-13-2019, 01:37 PM   #58
subaru_gc8
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Quote:
Originally Posted by StarkWRX View Post
Now my turn to jump on the band wagon....

Has anyone used Tomei turbos? Thoughts?
I think the tomei turbo is a little small for the 2.5, I would suggest the 18gxt or a 20 gxt with a 10cm turbine housing
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