Nothing really because once you go past what the stock turbo is capable of you get into building the short block.

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I disagree, wholly.

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How can you expect us to give you an accurate and educated answer on this little bit of information? What are your power goals? You say a FULL catless exhaust, do you mean from the turbo back, or manifold and uppipe too?

If all you have is a catless turbo back exhaust, or even a full exhaust there are plenty of other things you can do to add some ponies without slapping a bigger turbo on there. Look at my build, Im making 315whp and 337wtrq on 18.5 psi with a conservative tune because I DD the car. There is still more I can do without replacing the turbo that will put around 325-335whp. Here is a list to get the most out of your car without building the block or replacing the turbo.

-Equal length manifold
-uppipe for external wastegate
-38mm wastegate
-1000cc injectors
-265lph fuel pump
-3 port electronic boost control solenoid
-tgv deletes
-larger tmic
-cai
-one step colder plugs
-tune

With those mods and a good tune you should be putting down around 330whp and 360wtrq +/- 10.

 

With those mods and a good tune you should be putting down around 330whp and 360wtrq +/- 10.

Torque is what really puts strain on engine components (as well as drivetrain). If you ran the same setup with a 20g you could make that number closer to 360/360 without adding too much additional stress to the engine, and an extra 40whp in the top end would definitely be a noticeable improvement.

In general, better efficiency will translate to increased knock resistance as well. Pushing the stock turbo to its limits isn't exactly the best way to go about keeping stress off the engine.

 

It's just my opinion from what I've read around the webernetz. Most people who are swapping turbos are not going for 350hp.

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That completely depends on your goals! Don't put words into peoples' mouths.

Also, most people are stupid.

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At stage 2, you can go a lot farther once you upgrade things like your fuel injectors, intercooler, an EBCS, etc. You're nowhere near maxing out the stock turbo, so I'd do the supporting mods and get a protune first and see if you like where it's at.. THEN go for more power if you see fit.

 

I could not agree more with you wrx maniac

 

OP never even responded. But yea, too many people get the idea of needing a larger turbo to get decent power out of our cars. Really, the vf52 is a pretty capable turbo for street driven builds. My engine and turbo will remain stock until the car is paid off and I have another reliable DD.

 

VF52 is pretty small. A larger hotside and wheel will really bring out the potential of the 2.5L.

You guys are completely ignoring the spectrum of turbos between a VF52 and a rotated GTX35

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VF52 is pretty small. A larger hotside and wheel will really bring out the potential of the 2.5L.

You guys are completely ignoring the spectrum of turbos between a VF52 and a rotated GTX35

^This.. when comparing my old vf22 to the 20g I ran for a short time, spool was nearly identical and max torque was very similar. As far as driving on the street the two turbos felt nearly identical. The big difference was that where the vf22 made close to peak torque for only about 500rpm (before power began to fall off sharply), the 20g felt like it held the power MUCH better and just kept pulling hard all the way to 6600rpm.. it really felt like it spooled up to peak torque and just stayed flat across until you let off. It was a huge improvement to the powerband across the board. I don't think there was a single point in the rpm range where the 20g didn't make more power then the vf22, and power delivery felt 100% smoother.

Just because you run a larger turbo doesn't necessarily mean you have to run more boost or push the engine harder. You could run a little less peak boost, with better efficiency from the compressor, and end up with a considerably better powerband and equal or even less strain on the engine.

Also, most people are stupid.

Also this.

 

I am not disagreeing that a turbo upgrade can be beneficial. It is just my opinion that there is still much more he can do in just bolt ons to get more power before deciding to jump into a turbo swap. However I will openly admit that I was not aware that the 20g turbo is that beneficial compared to the vf52.

 

Yes there is room for improvement but the RHF55 series is very antiquated IMO. The housing is too small, no twinscroll on VF48/52, OEM cast wheels, wastegate port too small. It's a good match for a 2L EJ but too small for the 2.5 IMO

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I will only reply on experience based on being a 2012 WRX owner and sitting comfortably on many mods and all done extremely tastefully and very thoroughly researched prior to commencement of works.
Bang for buck as per the actual question posted
- turbo back exhaust ✔
- Ecutek tune (or the like) ✔ a must after installation of an exhaust
- verticooler has fantastic cooling % vs stock and or great comparison to front mount.
- e85 tune brilliant on bang for Buck. However additional works is a must to ensure engine capabilities
- garrett GTX turbo 30/71 I highly recommend. Phenomenal power that is perfect with upper mods and obviously the additional requirements necessary to ensure engine is not over worked / excessive boost.
Power output 265-275kw atw
Bigger turbo will gain more power however a stronger build to the engine (header / pistons and rods being the focus, along with a strong clutch) to ensure no internal damage.


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verticooler has fantastic cooling % vs stock and or great comparison to front mount.

Do you have any data to support this claim?

I've been wondering the capability versus standard ProcessWest TMIC. I like the idea, but suspect the verticooler is primarily marketing.

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Stats I have been given and backed up on various readings you are looking at an almost 50% maintaining in 'cooler' temp then your standard top mount and 17% cooler then your front mount intercooler. A tuners / track dream.
But don't take my word for it - every one will have their own % in numbers vs stats. Have a good look into the verti - read forums etc. I now have one, could I feel the difference between verti vs top vs front - no ... But it Sure looks the part!!


MrWRX2012

 

Yeah but that's the problem.... no one can give numbers. Of course, there is no way to directly read the TMIC efficiency on a stock EJ motor. I was hoping someone would have done the test with an IAT relocate or something.

 

MrWRX2012

 

Yeah would love to be able to give you the roar data mate ... Unfortunately I had to go by many data reads to make this decision - not on my vehicle ... Definitely be worth hearing from someone that has done it personally ....


MrWRX2012

 

On the Processwest web site it does show the difference in stock vs verti ... A good read


MrWRX2012

 

Of course they'll show a difference

 

Zax you hit the nail on the head. When I was deciding on which intercooler to upgrade to I knew I wanted a process west, but was undecided on the verticooler vs standard. At the time the verticooler was just recently released and there was not much info on it. I opted out and got the standard tmic and love it. I have checked back on the forums from time to time just to see if anyone has real proof of the claimed gains compared to the standard. And I always come up empty. And like you said, of course THEY will claim it to be better, but more than likely it is just marketing. Kind of like all of the companies saying that their intake is safe to run without a tune, data proved that to be wrong.

 

Don't agree with this at - 1. I ain't got a process west and 2. Direct air into the intercooler vs channeled air all day every day would be more affective. You bought the TMIC clearly because you liked the flat look vs the vertical look. It would never create a negative result vs the flat TMIC in results. Also your point relating to data proof ... If you ain't willing to believe the stats companies are putting out relating to the air result differences ..... Then go do the test yourself - because clearly you want the result not to be better and won't take the facts given to you at hand plenty of companies are now creating the verticooler ie MRT. They wouldn't create something if it wasn't prooven.


MrWRX2012

 

Don't agree with this at - 1. I ain't got a process west and 2. Direct air into the intercooler vs channeled air all day every day would be more affective. You bought the TMIC clearly because you liked the flat look vs the vertical look. It would never create a negative result vs the flat TMIC in results. Also your point relating to data proof ... If you ain't willing to believe the stats companies are putting out relating to the air result differences ..... Then go do the test yourself - because clearly you want the result not to be better and won't take the facts given to you at hand plenty of companies are now creating the verticooler ie MRT. They wouldn't create something if it wasn't prooven!!!!


MrWRX2012

No, simply put there is no data. Stop getting defensive. Fluid flow is far more involved than the angle of the intercooler.

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Not defensive my friend - personally I believe it comes down to a lack of research or phone calls made to the apparent companies to obtain further facts. That is why I push my point. We all have a right for an opinion.


MrWRX2012

 

One nice thing about the verticooler is with the optional turbo to ic hose you can put on Sti style fitment turbos, opening up a larger world of aftermarket turbo options. The data on Pw website is pretty good looking to me. People like to be incredulous I guess. But there's also the fact that in the vast majority of daily driven scenarios the intercooler you have on matters to a negligible degree.

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But there's also the fact that in the vast majority of daily driven scenarios the intercooler you have on matters to a negligible degree.

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Only for the plebs who won't go wot and shift at redline.



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Very well put crepitus


MrWRX2012

 

Lol

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Haha


MrWRX2012