85

IHI VF34 is ball bearing and the VF22 though is not, has a bigger compressor housing which as you know results in more hp but ends up lagging to full boost by about 700rpms.

I was wondering if the housing on the 22 will swap right over to the 34 and if so where can i buy the compressor housing from? thanks

85

:::BUMP:::

TheShodan

iTrader: (14)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 85 &raquo;</TD></TR><TR><TD CLASS="quote">:::BUMP:::</TD></TR></TABLE>

Please measure the inducer of both turbo compressor housings. typically they do not "swap" regardless of A/R. I may have something that may work from the Subaru Camp. Please, make sure these are the correct turbos, then PM me. I may have a solution.

Personally, either way, these turbos are not the best for Hondas, including LS.

HiProfile

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TheShodan &raquo;</TD></TR><TR><TD CLASS="quote">

Please measure the inducer of both turbo compressor housings. typically they do not "swap" regardless of A/R. I may have something that may work from the Subaru Camp. Please, make sure these are the correct turbos, then PM me. I may have a solution.

Personally, either way, these turbos are not the best for Hondas, including LS.</TD></TR></TABLE>

I'm curious why you'd say this. The IHI VF-22 is rated along the lines of 435CFM at 18.0PSI. Assuming ~90% VE at 7100rpm on an LS, it would be a very close match. Not a race turbo, but a good street turbo.

AFAIK, the VF34 has a slightly smaller inducer, but the turbine is essentially clipped vs the vf22. The vf22 is a newer design, and the subheads seem to feel the vf22 is overall better. In other words, I doubt you can change the housings. And if you could, you wouldn't want to mix a better housing design with an older turbine/compressor design.

85

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">

I'm curious why you'd say this. The IHI VF-22 is rated along the lines of 435CFM at 18.0PSI. Assuming ~90% VE at 7100rpm on an LS, it would be a very close match. Not a race turbo, but a good street turbo.

AFAIK, the VF34 has a slightly smaller inducer, but the turbine is essentially clipped vs the vf22. The vf22 is a newer design, and the subheads seem to feel the vf22 is overall better. In other words, I doubt you can change the housings. And if you could, you wouldn't want to mix a better housing design with an older turbine/compressor design.</TD></TR></TABLE>

The turbo is actually for a WRX (2.5L) autoX car. It would be nice to use the ball bearing greatness of the 34 with slightly greater flow of the 22. the 22 by it self spools up a little to slow for what i need. but on the other hand the 34 will make an easy 300AWHP. thanks for the input

TheShodan

iTrader: (14)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">

I'm curious why you'd say this. The IHI VF-22 is rated along the lines of 435CFM at 18.0PSI. Assuming ~90% VE at 7100rpm on an LS, it would be a very close match. Not a race turbo, but a good street turbo.
</TD></TR></TABLE>

I'll elaborate my statement. you have to look at the head design and efficiency of the TYPE of motor based upon its engine demand flow, not just look at a general VE for a 4 cylinder base. (Max RPM of the LS is 6800).

The maximum range for this VF22-RHF5 turbo efficiency is just over 12.3 cubic meters/min (This translates to about to about 434cfm or 30.5lbs/min) Your calculation for the 435cfm is based upon a 2PR, not on a converted car like an LS, in which based upon its engine demand flow would max this turbochargers peak efficiency out at about 8.5psi(1.63PR), not 18psi(2.27PR, assuming a .75 Pressure drop in the I/C). at 8.5psi with this type of motor/compression/ max rpm, and displacement of 1857cc, it would make about 234whp. Which isn't bad, for an LS. It can be PUSHED to about 12psi for the LS before you're WAY out of its range, but again. Not bad. But the question is, is it worth going through all the trouble to create a manifold and design for such a pushed unit on the LS, when there are TONS of universal applications that can work? Not really. That was all I was trying to say in the first post, without getting into the crazyness of the numbers.

As for the OP, there are alternatives of this that has a bit more efficiency with about 590cfm max (or 16.7 cubic meters/min @ 2PR) That's to a point of efficiency similar to being found in a PE1820, without the hassle of worrying about the unit not being able to be rebuilt. I've PM'd you the specs of this turbo which still bolts directly to the 2.5 WRX.

Drew Peacock

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 85 &raquo;</TD></TR><TR><TD CLASS="quote">IHI VF34 is ball bearing and the VF22 though is not, has a bigger compressor housing which as you know results in more hp but ends up lagging to full boost by about 700rpms.

I was wondering if the housing on the 22 will swap right over to the 34 and if so where can i buy the compressor housing from? thanks</TD></TR></TABLE> VF22 is roller bearing, it is not a bush bearing turbo.

VF22's are getting old now. Why not look into a aftermarket turbo?

HiProfile

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TheShodan &raquo;</TD></TR><TR><TD CLASS="quote">*insert TheSHodan's truth*</TD></TR></TABLE>

Good explaination. I never doubted your opinion, as you're definately one of the most knowledgeable guys regarding turbos. I just wasn't looking at putting the turbo at its peak effeciency, for one, the maps I've found I can't even see the eff. numbers. In other words, trading max eff. for less lag - a rarity on HT.

TheShodan

iTrader: (14)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">

Good explaination. I never doubted your opinion, as you're definately one of the most knowledgeable guys regarding turbos. I just wasn't looking at putting the turbo at its peak effeciency, for one, the maps I've found I can't even see the eff. numbers. In other words, trading max eff. for less lag - a rarity on HT.</TD></TR></TABLE>

No worries. Glad to help. Let me know if you need me to post up VF22 and VF23 turbo maps.