Integrity Performance

I have been meaning to post these for a while.

SO, I have a VF43 and a VF39 here to be ported, both in great shape, so I thought these would be perfect for comparison, to discover a few things, and to my suprise, dispell a couple myths.

SO here they are

The VF43 is on the right, VF39 on the left. Think that the VF39 compressor housing looks slightly beefier? It is. Its not a huge difference, but its definately bigger. Notice that the compressor wheels look identical? Having seen so many IHIs apart, I can tell you that I would bet my life on them being the exact same wheel.
What does this mean? That they are identical turbos when it comes to the compressor section, if anything, the VF39 compressor would be slightly better.

VF43 closer pic



VF39 closer pic



Back side pics, again, VF43 on left, VF39 on right.
Identical size hot wheel outlet. Wheels look identical. I have a pic of the VF39 wheel with the housing off, I will be disassembling the VF43 today, and as long as I can get the hot housing off (many MANY VF43s are seized together and simply cannot be split) I will get pics to directly compare the two wheels to confirm if they are in fact the same hot wheel.

Side by side on their side. The angle isnt the best, but the hot sides are identical size wise. There are some VERY slight differences in shape, but not any that would make a power output difference.


Here is a closer pic of the VF39 hot side


Here is a closer pic of the VF43 hot side


So I have to say, there is no way that either of these turbos will make a measureable difference in power from one to the other.
The VF39 cracks pretty often, and in 99% of cases, it doesnt change the performance in any way.
HOWEVER
The VF43 also cracks, not as often, but it DOES crack in the same place.

I will stick my finger in and see if I can feel any thickness or shape differences inside the inlet of the hot side, to see if maybe the 43 is thicker or something in the area that typically cracks. Looking in there, it doesnt look any different.

 

toddlamp

Nice write-up.

Now, I dare you to post this up on NASIOC and see what those kids have to say

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Starting to save for a 6spd swap.

Integrity Performance

DONE.

Honestly man, Nasioc isnt that bad. Sure there are a lot of tools there, but when the board is 5X the size of SF.org, it should be expected that it will have 5X the garbage. Ya know? There is no getting around NASIOC being THE source for subaru knowledge. There are simply too many REALLY experienced and knowledgeable people over there.

Overlord

Dave,

Did I give you permission to post pictures of my turbo for all to see? Just Kidding. Can't wait to see your post PNP pics.

DC

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Aspen White 04 XT - Mod Curious

JCT

Excellent info Dave.
If they are that close, VF43 folks could run VF39 OTS maps without issue.

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2005 FXT 4EAT

Integrity Performance

I am currently trying to figure out how I managed to post that same side on pic twice and make sure I didnt want a different pic there....

*edit*

ok fixed

gandapanda

Nice writeup, Dave... btw, the VF39 in the pic looks like its developing a crack as well.

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- sonny
05 FXT - stock
06 s2000 - stock
10 Forester - stock
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97 200sx - gone

scans007

Def cool to see.......I went with the VF43 cuz I got it so cheap new....I didn't think it would make more power, and it's good not to be guessing anymore!

Great work man!

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SkiPhast

Just a heads up, you have the two turbos backwards in the notes of the first pic.

VF39 is on the left, 43 on the right.

Integrity Performance

I thought I fixed that here as well.... I fixed it on nasioc.

*edit*

Fixed it :)

Rcebowl

good write up!

fourortwowheels

nice write-up as usual dave. was the vf39 using lotsa torco? why is it all orange?

Dub

awsome info! Thanks!

Curran

Can someone point out where these turbos typically crack?
Thanks,
Curran

The Black Box

+1. You just can't overlook the amount of info. that's available there. The punks only bother you if you let them...

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