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Old 07-09-2008, 09:15 AM   #51
1BDREX
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im sure this question has been covered before, but whats the max boost that the vf43 is capable of? just asking cause i got mine running at 21psi right now, but im going EWG soon.
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Old 07-09-2008, 10:05 AM   #52
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Pmd you Defiant.
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Old 07-09-2008, 10:15 AM   #53
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Quote:
Originally Posted by 1BDREX View Post
im sure this question has been covered before, but whats the max boost that the vf43 is capable of? just asking cause i got mine running at 21psi right now, but im going EWG soon.
On meth I would say 24PSI would be no problem whatsoever. On pump 21 is about perfect for a high boost map.
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Old 07-10-2008, 11:15 AM   #54
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Quote:
Originally Posted by Defiant Autospeed View Post
But if there is a WG pressure difference, or if something about the WG actuator reacts differently, it could throw things off.
Thats the difference in the Cobb Maps I'm sure. The VF43 are sprung to ~10-11psi WG pressure whereas the VF39 were ~9psi IIRC.
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Old 08-11-2008, 12:58 PM   #55
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It's been asked before and I know.. I have read alot of threads but what do you guys think of a VF43 w/ VF39 Cobb AP Map??

If it was answered in this thread please let me know

~Jeff~
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Old 08-11-2008, 01:47 PM   #56
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AFter all my perusings, i would say it is safe to run until you can get it tuned. Just dont WOT. Then again, i decided not to even try it, I just got Clark Turner to email me a 43 specific map.

Take that advice for what its worth.
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Old 08-11-2008, 02:55 PM   #57
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Quote:
Originally Posted by phoenix_wrx View Post
AFter all my perusings, i would say it is safe to run until you can get it tuned. Just dont WOT. Then again, i decided not to even try it, I just got Clark Turner to email me a 43 specific map.

Take that advice for what its worth.
Well.... Did you get a protune from them?? Or did they just send you a VF43 map??
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Old 08-11-2008, 03:13 PM   #58
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Its an email tune, but clark has done many tunes in his travels, so its supposed to be better than a cobb ots map. For his 150 fee, you get a map, then log it yourself, send him the logs, and he tweaks the map. Kind of a poor mans road tune. Works for me, cuz i dont want want to drive 6 hours to atlanta or 8 to texas for a protune. Cheaper too. Maybe not 100% of the power i could make on the setup, but a decent compromise.
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Old 08-26-2008, 04:29 PM   #59
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have you been able to compare the center sections of the turbos in question?

Is there a possibility of a different type of bearing?
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Old 08-27-2008, 01:15 PM   #60
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Subaru has already put out a paper stating that the only difference was the WG actuator.
(and obviously the external shape of the compressor outlet)
So no, they are the same bearing type.
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Old 12-22-2008, 06:12 PM   #61
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Defiant Autospeed,

What do you charge to port the exhaust side of a vf39? Also, can the vf39 bearings be changed to ball bearings?
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Old 12-22-2008, 06:35 PM   #62
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PHENOMENAL POST!

+1 FOR STICKY

Were not Evos guys. The 39 and 43 are basically the same. If we were comparing the 16g8 and 16g9 on the other hand, now thats a different story...
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Old 12-22-2008, 06:40 PM   #63
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If you have a micrometer Ill measure my vf34.
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Old 12-22-2008, 06:46 PM   #64
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Silly question maybe but what was the point of the new turbo if the VF-39 is the same thing? Why didn't they just continue using the VF-39 if they are identical? They should start putting VF-22 sized turbos......
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Old 12-22-2008, 06:51 PM   #65
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Theres even only a slight difference between the 39 and 22 back to back. Id like to see a vf22 with a 34 center. But there still small and unrebuildable.
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Old 12-26-2008, 02:53 PM   #66
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BUT, with the P20 hot side, the VF22 will always make more power and have better throttle response. Subbies LOVE hot side size increases. The compressor is a touch larger as well. Most of the power difference would come from the hot side though.


As for a VF22 back with a VF34 front, they make it. Its a VF23
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Old 12-26-2008, 02:54 PM   #67
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Quote:
Originally Posted by Fierysun View Post
Defiant Autospeed,

What do you charge to port the exhaust side of a vf39? Also, can the vf39 bearings be changed to ball bearings?
PM' ya in a min

And no, you cant change them to ball bearings. Nothing about the IHI turbos is rebuildable like that unfortunately.
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Old 12-26-2008, 02:57 PM   #68
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Quote:
Originally Posted by Red Rexx View Post
PHENOMENAL POST!

+1 FOR STICKY

Were not Evos guys. The 39 and 43 are basically the same. If we were comparing the 16g8 and 16g9 on the other hand, now thats a different story...

Subaru put out a paper a while back that stated that the only difference is the wastegate actuator. The inner passages and wheels are identical. Nothing changed but the outside shape and the WG actuator.
So neither is really an upgrade over the other, as the 43 still cracks and still creeps.
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Old 12-26-2008, 03:02 PM   #69
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very nice write up.. thanks!
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Old 12-26-2008, 05:54 PM   #70
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Quote:
Originally Posted by Defiant Autospeed View Post
PM' ya in a min

And no, you cant change them to ball bearings. Nothing about the IHI turbos is rebuildable like that unfortunately.
I wouldnt say all IHI turbos arent rebuildable. Its the VF series that isnt. Others like the rx6 are rebuildable.
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Old 04-02-2009, 10:57 PM   #71
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The write up was well written. +1 for the info
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Old 04-02-2009, 11:30 PM   #72
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interesing! good work.
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Old 04-02-2009, 11:42 PM   #73
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vf48 comparo!
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Old 04-03-2009, 12:15 AM   #74
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What changes to the motor did the 07 receive? I am finding it hard to find anything via search. I am just wondering as I may be a future subaru owner. I do seem to see 07's making more power than previous years as you say.
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Old 04-03-2009, 08:59 AM   #75
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What changes to the motor did the 07 receive? I am finding it hard to find anything via search. I am just wondering as I may be a future subaru owner. I do seem to see 07's making more power than previous years as you say.


http://en.wikipedia.org/wiki/Subaru_...._E_.282005.29
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