General Turbo Advice - Subaru WRX Forum
 
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#1 Old 10-05-2012, 10:51 PM
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General Turbo Advice

Im still rocking the stock turbo but planning ahead on something bigger. What would the spool up be like with a turbo that flows around 40 lbs/min on the Ej205? My idea is having the engine around 400hp and spool to start around 3000rpm and hit full around 4000rpm. List off some turbos that would fit that description. Im still unfamilier with the 16g, 18g, and 20g turbos which they seem popular and decent priced. Thanks everyone.

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#2 Old 10-05-2012, 11:25 PM
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Sounds like you had an 18G in mind.
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#3 Old 10-06-2012, 05:01 AM
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Not to sound like an d-bag, but have you ever driven a 400hp car before? If so I'd be looking into the TDO6 20g or higher.

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#4 Old 10-06-2012, 07:03 AM
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I love how forums make you explain yourself. I already built a 550whp 67mm SR20 about 5 years back. Ran high 10's @ 132-133mph, stock suspension, stock 5 speed with only drag radials. Coming from an inline four to the flat four, spool up is a bit different. The turbo i had on the SR before the 67mm was a GT2871R which was doing 400whp @ 21psi and hit full boost around 4200rpm. Im looking for something similar in spool up and flows around 40 lbs/min to get the engine to 400hp (not awhp).

The two suggestions are the 18g and 20g. What rpm will spool start and hit full compared to one another?

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#5 Old 10-06-2012, 09:39 AM
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A 20G is large for a 2.0L. It will kill the fun.
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#6 Old 10-06-2012, 10:09 AM
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Originally Posted by 02RexWgn View Post
I love how forums make you explain yourself. I already built a 550whp 67mm SR20 about 5 years back. Ran high 10's @ 132-133mph, stock suspension, stock 5 speed with only drag radials. Coming from an inline four to the flat four, spool up is a bit different. The turbo i had on the SR before the 67mm was a GT2871R which was doing 400whp @ 21psi and hit full boost around 4200rpm. Im looking for something similar in spool up and flows around 40 lbs/min to get the engine to 400hp (not awhp).

The two suggestions are the 18g and 20g. What rpm will spool start and hit full compared to one another?
If you already know how then why are you asking...?

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#7 Old 10-06-2012, 10:18 AM
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Not sure if you can see the pic really well, but here's a dyno chart of my 07 WRX with a 20G turbo and supporting mods (see my profile for mod details). The car made 365 whp/340 wtq which is probably about what you're looking for. Keep in mind that my car has a 2.5 L engine where yours has a 2.0 L, so the torque will probably be a bit different. The sweet spot for me is between 3,000-5,000 RPM (give or take).
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#8 Old 10-06-2012, 10:41 AM
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If you already know how then why are you asking...?
Im asking for the spool charectoristics of these turbos on the ej205. If it was a inline 4 i would already know which turbo to go with but because the flat 4 has such a longer exhaust path, it will spool later then what im used to. So if you dont mind, stop posting useless crap in the thread. Help out instead.

Thank you to the other guys for posting your info and opinions. They have helped and i appreciate it. That 20g dyno looks pretty nice and smooth. Would you say that turbo on a 2.0L would change the peak tq numbers by around 500-750rpm or so?

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#9 Old 10-06-2012, 01:27 PM
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You need to calm down, nobody here knows you from the next guy.
People join all the time to ask beaten questions, like about BOV's and will you tell me what to build type crap. Than never come back ever again.

He is just trying to understand your needs for the specific info. Not trying to belittle you.
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#10 Old 10-06-2012, 02:41 PM
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Originally Posted by 02RexWgn View Post
Im asking for the spool charectoristics of these turbos on the ej205. If it was a inline 4 i would already know which turbo to go with but because the flat 4 has such a longer exhaust path, it will spool later then what im used to. So if you dont mind, stop posting useless crap in the thread. Help out instead.

Thank you to the other guys for posting your info and opinions. They have helped and i appreciate it. That 20g dyno looks pretty nice and smooth. Would you say that turbo on a 2.0L would change the peak tq numbers by around 500-750rpm or so?
Useless crap.........

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#11 Old 10-06-2012, 05:34 PM
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I found what i needed to know over at Nasoic. They have a much more helpful group of people over there. Thank you Brfatal and Man Show, you two helped me out in the thread.

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#12 Old 10-06-2012, 06:33 PM
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Originally Posted by 02RexWgn View Post
I found what i needed to know over at Nasoic. They have a much more helpful group of people over there. Thank you Brfatal and Man Show, you two helped me out in the thread.
Great glad they could help...

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#13 Old 10-06-2012, 11:43 PM
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If you think that Nasioc is more helpful than this site...then maybe you belong over there. That place is full of flamers that will torch you for asking a simple question a majority of the time. Plus people on here just ask for more information to get a idea of what you know as a owner or what is on the car to know what were up against. We can't all be...

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