18G or 20G turbo? - Subaru WRX Forum
 
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post #1 of 15 Old 04-03-2011, 11:42 PM Thread Starter
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18G or 20G turbo?

Hey all. Im kinda new to the Subaru scene. I currently have a 2011 WRX sedan that I have had for a coupple months now. Before that I had a 2010 for about a year, but traded it in for the 2011 because I like the new body styling SO much more .

Anyway, now i want to start upgrading my car. Im looking for the 350 whp range with room to grow. Now my question is, what turbo would you recomend? an 18G or 20G? TDO5 or TD06? And obviously will be in need of the supporting mods. Bigger, injctors, fuel pump, better intercooler etc. And feel free to recomend the supporting mods that would work best.

I have an idea of what im looking for, just looking for some more opinions from more experienced Subaru owners.. And i know all about the weak 5 speed issue and what options there are for that. Im not concerned with that at the moment.

-Thanks all
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post #2 of 15 Old 04-04-2011, 12:01 AM
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wow $3500 body kit, nice upgrade

sorry i had too.

your stock turbo will get there but will require basically every bolt on made. i guess if you added it up it will cost you more in the end opposed to just buying an aftermarket bigger turbo. the VF52 can really push it!! so id have to say no 18g, its going to be taking a step sideways instead of forward. a 20g is more of an upgrade and of course you'll need a FMIC. blouch makes a 20g but if your not going to be using a TMIC then id look into the 2.5xtr, 1.5xtr, or 1.0xt. all flow more and are just alittle better for the long run.

as for supporting mods all you need is injectors, pump, and FMIC. stuff like TBE, CAI, boost control etc are just options at that point. however thoughs parts are still going to run $3500 with a tune. you could spend $3500 on the stock VF52 and get almost all the mods you want plus be close to your number.

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post #3 of 15 Old 04-04-2011, 12:13 AM Thread Starter
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Lol hey, I say if your gonna be in debt at least be happy about it.
But yeah I was leaning more toward teh 20G would the TDO6 or TDO5 be a better choice for the 20G, and how is the lag on that turbo? about when will it hit full boost?
Im not too concerned about price, I will be PCSing to Osan AB in Korea for the next year where I will have plenty of time to plan and save.
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post #4 of 15 Old 04-04-2011, 12:18 AM
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not a lot of people will know that answer. different parts, different tune, atmos, temp etc will all affect spool. just remember bigger will be slower. if it must be a 20g i wouldnt get either. id get the blouch 20gxt which doesnt say a size that i can see, just 7,8, or 10cm turbine housing. if you want power and fast spool the 1.5xtr might be what you want.

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post #5 of 15 Old 04-04-2011, 12:41 PM
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A TD06-20G is not near big enough to get you to 350whp on a mustang dyno. If that's your goal, you're going to need a GT30R at least which will probably be too much for your motor and will definitely require expensive transmission work. I suggest deciding on how much, if any, engine internal and transmission work you want to do FIRST and then picking parts that will work with that setup rather than pulling numbers like 350 out of the air and working backwards. If you really want a 350whp daily driver, I would say the first step for you to do is sell your car and buy an STi. It will be cheaper in the longrun. You'll have to junk too much of the WRX at those power levels to stay cheaper compared to the base platform of the STi.

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post #6 of 15 Old 04-04-2011, 01:24 PM
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Not entirely true, Josh hit I believe 320awhp on a mustang dyno with a 20G not even near being maxed out, but thats besides the point a dyno just spits out a number and it's all based on the settings the shop owner set it up with for example my car made 513 on a mustang, then 489 on one dynojet and 546 on another dynojet without one setting on the tune changed. Do I think a 20G can support 350 on a mustang, Yes but it will be pushed to the max and you'll need almost all the bolt ons available, but it can be done and it will spool way nicer than a 30R and probably cheaper than the 30R if you go with a rotated kit. Also, it seems that the newer WRXs have exponentially stronger gearboxes and they don't start crapping out until 420+ AWTQ which will be well under that with 350awhp

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post #7 of 15 Old 04-04-2011, 07:39 PM Thread Starter
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So i got one guy telling me that i can get there with my stock turbo with various other bold on's. And another guy telling me i cant get even close with a larger turbo and other supporting mods? And then to sell my car and buy an sti? Well this is no help.
Im not limiting myself to just bolt on's. Once i have the parts collected the motor will come out for some internal parts replacement. Pistons, connecting rods, Do some head work, and larger camshafts.
Im just making a shopping list for now. So a rotated turbo kit would be a better way to go?
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post #8 of 15 Old 04-04-2011, 08:51 PM
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Let me ask what is your end power goal, if it's over 450awhp then yes rotated is the way to go, but if not there are plenty of stock location turbos that could get you there especially if your opening up the heads and doing cam and port work, I was hitting 400awhp on a 30R pump gas, stock heads, 2.2L

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post #9 of 15 Old 04-04-2011, 09:14 PM Thread Starter
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No, not looking for 450+ awhp. 400 at the most. Would like to start at 350 and have some room to grow. I want to pull the motor and do the build just for peace of mind that the motor can take more abuse if i decide to start upping the power more. Engine building and machining is a hobby of mine so i will be doing the work myself. But yes i would like to keep the stock location turbo and run on pump gas.
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post #10 of 15 Old 04-04-2011, 09:21 PM
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This will get the job done

GT3076R Turbo Kit for Subaru WRX/STI, stock location - INTERNALLY GATED : atpturbo.com

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post #11 of 15 Old 04-04-2011, 09:34 PM Thread Starter
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Looks like what im looking for. So that turbo should too much later with all the extra head work then yeah?
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post #12 of 15 Old 04-04-2011, 09:39 PM
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I had stock heads on my 2.2 Stroker when I ran a 30R and I would hit full boost right around 4200-4300RPM so with the 2.5 and better flowing heads I would assume you should be seeing full boost by 3800-3900 with that turbo

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post #13 of 15 Old 04-04-2011, 09:45 PM Thread Starter
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Nice, thats what I would like to see, thanks for the info man!
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post #14 of 15 Old 04-04-2011, 10:06 PM
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Blouch's turbo for that i believe would be the 3.0XTR, just another option.

Subaru WRX/STi Dominator 3.0XT-R Ball Bearing Turbocharger

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post #15 of 15 Old 04-04-2011, 10:40 PM Thread Starter
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Thanks, Ill keep that in mind too.
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