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Old 01-14-2009, 12:18 AM   #51
Prevent
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Quote:
Originally Posted by 3rdangle View Post
I'm looking for some help identifying a turbo which is basically equivilent to the OEM VF-43, but which has a compressor map available online. I've reviewed the Turbo FAQ, but it is more orientated towards upgrades rather than OEM replacements. I'm attempting to perform a simulation on an '07 STI, and compare the results against DeltaDash data. Basically, I'm looking for a compressor map that is "close-enough".

Thanks in advance for any help!
Not sure if you've seen this page, but it has a compressor map for the VF39/VF43, also the VF39/VF43 is suppose to be somewhat similar in size to a T3 style turbo

http://www.ihi-turbo.com/turbo_RHE-RHF.htm
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Old 01-14-2009, 12:23 AM   #52
3rdangle
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Default Inquiry for Equivilent Turbo to VF-43

I may be missing it, but when I go to that page, there is nothing on a VF -39 or -43. Just RHEx and RHFx. Please advise my oversight.

Thanks!
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Old 01-14-2009, 12:35 AM   #53
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on the compressor of the vf39 it has RHF55 stamped on it
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Old 01-14-2009, 12:40 AM   #54
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There are no speed curves or efficiency curves. Another reason I'm looking for a "close-enough" turbo which has a complete compressor map. Any other suggestions?

Thanks!
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Old 01-14-2009, 12:42 AM   #55
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Once again you have amazed us all. +hojillion
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Old 03-16-2009, 01:46 AM   #56
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I have a question pertaining to engine longevity and turbo selection that I have not been able to answer utilizing Maximum Boost nor the FAQs. Forgive me if this seems like a simple man's question.

I assume higher boost pressures decrease engine lifespan, for instance 20psi will wear an engine out quicker than 16psi. I'm also assuming that at a given RPM, a larger turbo can create the same amount of power as a smaller turbo at a lower boost pressure. Are these assumptions correct?

What I am getting at is whether or not it would be beneficial for engine lifespan to select a slightly larger turbo and run it at a lower psi, with the trade-off being a boost threshold a bit higher than that of a smaller turbo. Basically selecting a 300whp turbo for a 270whp goal (figuratively speaking).
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Old 03-16-2009, 10:57 AM   #57
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We don't know, but the question has been asked of Corky by me a few weeks ago. I hope to hear back from him on this and other issues soon.
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Old 03-16-2009, 03:21 PM   #58
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Cool thanks for the quick reply.
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Old 04-08-2009, 10:18 PM   #59
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great sticky
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Old 04-11-2009, 01:49 PM   #60
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Hey Unabomber, is your super 16G equipped with a 16PSI actuator?

Also, the difference of flow from 575 cfm to 585, is due to porting and polishing, right? the Compressor is still the Evo3 16G wheel and the turbine is still the TD05H in a 7 sq cm housing, no?
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Old 04-11-2009, 04:45 PM   #61
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Don't know the actuator for sure...whatever comes stock is what I got. The cfm difference is a different wheel, not porting though I did get mine ported, so the Super16G is not an EVOIII but something slightly bigger/different. Everything else is the same.
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Old 04-29-2009, 01:31 AM   #62
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Someone help me... I have a guy trying to sell me a VF39 and swears up and down it came off an 06 STi, yet I read here that they didn't put the VF39 on the 06/07 models. This makes sense, and I am just wondering where I can get some super awesome verification? I did read somewhere though that the VF43 was only used once on the 07 STi is this true?
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Old 04-29-2009, 08:50 AM   #63
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As far as turbo size and longevity:
I am also waiting to see what the famous Corky has to say.

I came up meanwhile with this speculation:
If you're looking at non ball-bearing turbos, there's a lot of information pointing in the direction of these needing increased oil flow vs stock.
FP wants you to use a different banjo bolt and oil supply line.
This may amount to an increase of oil flow through the turbo by 50% or more.
Where is this extra flow coming from?
From your engine
From your bearings...
An increase in this supply flow may result in an overall oil pressure decrease.
I think oil pressure works similar with fuel pressure. There are restrictions in the discharge. Opening one of the restrictions may have effects.

The bigger turbos may legitimately need more oil supply, but so will your engine, running higher loads.
Ideally, someone with an oil pressure gauge may have upgraded the turbo and give us some results.
I wonder what Subaru did when they supplied the small 16g with the 90 degree compressor inlet in that older model. If they upgraded the oil pump, that may mean something.

If any of the above is true, then the safe way is to not install a much bigger than needed turbo, if you're not making provision for pumping more oil.
I actually seem to recall someone mentioning a "high flow Sti oil pump", from a JDM catalog.
If you're not ready to do this JDM upgrade, this may be where the much-ridiculed pink oil filter may come in handy..

Again, this is just speculation, "conspiracy theory", I don't have supporting facts. But if anyone wants to verify couple things, just to make sure none of the above is a problem, why not?
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Old 04-29-2009, 01:59 PM   #64
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you mention that there are the big 3 turbo manufacturors, but where do the kkk turbos come from?
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Old 04-29-2009, 02:05 PM   #65
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Quote:
Originally Posted by Unabomber View Post
[size=3]

What is my stock turbo?

2002-2008 WRX TD04-13T
2004-2005 STI VF-39
2006-2007 STI VF-43
2008 STI VF-48
This is wrong. They only used the VF43 on the 2007 STi. They still used the VF39 on the 2006 STi. And we should add the mightly VF52 for the stock 2009 WRX turbo :-)
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Old 04-29-2009, 02:11 PM   #66
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Is there a Dos and Don'ts thread about Vf 39 swaps? It seems to be the most common swap and most asked about.
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Old 04-29-2009, 02:24 PM   #67
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Quote:
Originally Posted by ChronoX720 View Post
Is there a Dos and Don'ts thread about Vf 39 swaps? It seems to be the most common swap and most asked about.
The Dos and Don'ts are do more research than you can possibly stand. lol. but just know that this manifesto needs slight corrections.
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Old 04-29-2009, 02:25 PM   #68
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Quote:
Originally Posted by Vlad View Post
As far as turbo size and longevity:
I am also waiting to see what the famous Corky has to say.

I came up meanwhile with this speculation:
If you're looking at non ball-bearing turbos, there's a lot of information pointing in the direction of these needing increased oil flow vs stock.
FP wants you to use a different banjo bolt and oil supply line.
This may amount to an increase of oil flow through the turbo by 50% or more.
Where is this extra flow coming from?
From your engine
From your bearings...
An increase in this supply flow may result in an overall oil pressure decrease.
I think oil pressure works similar with fuel pressure. There are restrictions in the discharge. Opening one of the restrictions may have effects.

The bigger turbos may legitimately need more oil supply, but so will your engine, running higher loads.
Ideally, someone with an oil pressure gauge may have upgraded the turbo and give us some results.
I wonder what Subaru did when they supplied the small 16g with the 90 degree compressor inlet in that older model. If they upgraded the oil pump, that may mean something.

If any of the above is true, then the safe way is to not install a much bigger than needed turbo, if you're not making provision for pumping more oil.
I actually seem to recall someone mentioning a "high flow Sti oil pump", from a JDM catalog.
If you're not ready to do this JDM upgrade, this may be where the much-ridiculed pink oil filter may come in handy..

Again, this is just speculation, "conspiracy theory", I don't have supporting facts. But if anyone wants to verify couple things, just to make sure none of the above is a problem, why not?

I'll jump in and verify that the VF43 was only used in the 2007 STi, not the 06/07 STi
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Old 05-02-2009, 08:56 AM   #69
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I have the oil pump info:
For imprezas, the flows are indexed to the rotor thickness, in milimeters.
The Sti are considered high demand oiling motors, due to the oil actuated AVCS.
it seems that all WRX and Sti use a 10 mm oil pump, including the JDM "exotic" models and the USDM Sti.
The 08 Sti uses a 11 mm oil pump that has had some incidents (but not installed OEM on the car)
There is a 12 mm oil pump that is made by Subaru and possibly a good upgrade, but appears to be needed only in high power applications and is debated for high RPM applications.
It seems that for a WRX, having the same flow capabillity with an Sti, would mean that there are good flow reserves.
I've only seen one tread describing the OEM WRX as a 10 mm, I don't consider that as confirmation yet.
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Old 05-02-2009, 11:41 AM   #70
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I know that upgrading a turbo at all requires a tune, but would one still need a new pump and injectors if upgrading a stock WRX turbo to a VF48 or VF52?
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Old 05-18-2009, 02:24 PM   #71
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Great info for future mods.

Thanks
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Old 05-18-2009, 02:31 PM   #72
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Quote:
Originally Posted by SirBrass View Post
I know that upgrading a turbo at all requires a tune, but would one still need a new pump and injectors if upgrading a stock WRX turbo to a VF48 or VF52?
you could probably get away with just a new pump, but its a good idea to step up to a bigger injector
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Old 05-18-2009, 11:31 PM   #73
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Quote:
Originally Posted by thisisntjared View Post
you mention that there are the big 3 turbo manufacturors, but where do the kkk turbos come from?
? i am pretty sure that volkswagon/audi/porsche doesnt use anything else.
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Old 05-21-2009, 03:45 PM   #74
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great thread tons of information here. I've got a question about Turbonetics turbochargers if anyone has any experience with them they are having a garage sale open house type deal this weekend a half mile from my house. I am in the process of closing the deal on a 2009 STI and mine as well get the parts now I plan on upgrading. (sorry can't start new threads yet)
any particular model I should look for? Stay away from? I would like more top end but mostly more midrange for everyday driving fun and occational autocross.
any info would be greatly appreciated.

Last edited by Leadsled124; 12-04-2009 at 01:04 AM.
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Old 07-28-2009, 03:49 PM   #75
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The deadbolt link takes you to a sex offenders page... did I miss something?
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