I know of plenty with the issue. Very common. Ignore it.

Rich your wrong mate

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[DBR]

I Can Smell Tears Like I Can Smell Rain

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you mirin?

Out with it then ..

All i know is everyone i've asked said it was to do with the motor unable to accept the amout of air the turbo is trying to push in, explain what it is ..

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[SIGPIC][/SIGPIC]
Should have bought an STI

It definitely isn't that the motor can't accept the air flow. A VF34 is not a large turbo and not pushing that great of a volume of air through. It is all down to the actual design of the turbo since nearly every VF34 makes this noise.

My guess is either the design of the impeller or being a ball bearing turbo, it allows the impeller to spin more freely than other bearing types (i.e. allows the impellor to slow down quicker causing the chomp chomp chomp of air).

Ignore it as it is a fact of life with these turbos.

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]

I proberly cant hear it cause im either WOT or my BOV is venting with my DOOF DOOF goin YO!

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Honda Hannspree Edition CBR 600 RR - SOLD
Yamaha FZ1N - Purchased

Here is a interesting post I found on iwsti.com. It may not be fact in the end but its a very good post on the differences between these two turbo's physically since they are not documented much...
It doesnt say anything about the wheel diameter/ compressor etc. So power levels between the two are not documented in the post. Nevertheless, the physical differences look identical... -tode




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 VF39 is on the left, VF43 on the right. 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.


taken from http://www.iwsti.com/forums/engine-p...hs-busted.html -tode

Finally some decent pics. How long has the 43 been out now? I want to see the VF46 and VF48 now?

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Funny looking German Subaru

guys which turbo is better... VF36 or VF37?? and would it be a big increase over my stock TD04 turbo?

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MY06 WR BLUE WRX

Verso = 220hp, 17psi

VF36 (IMO) and yes it would be one of the biggest differences over stock. You will need to change the headers as well as it is twin scroll. Costly exercise but it would be an absolute ball tearer with all the supporting mods.

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No more GC8, sad face.
[SIGPIC][/SIGPIC]

VF36/37 are twin scroll. Look at getting a VF34 if upgrading from a TD04. Big improvement.

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]