My new turbo VF12 - VJ11 hybrid (pic inside) - Page 4

**n2o_matt** · 10-28-08, 18:21

don't know how i missed this thread... Here is some info that I have on the VF8:

I don't have much, I haven't ever taken it apart to measure it - I wish I did, I just really wanted this thing running and didn't want to screw anything up (like i've done so many time in the past haha)

What I do have is the specs that the guy who sold it to me gave me. - He claimed to work for IHI, and judging by the fact that he was able to give me vj-11, t-bird, and VF8 maps, i don't doubt it.

He said that it was a 5200IIP25BRLL4625

Hot Side:
Now IDK if the VF8 came with a 5200II exhaust wheel (same as our stocker) or not, but that's how I recieved the turbo. The only difference on the exhaust side is that it has a P25 a/r as opposed to our P20. He said that a P20 is ~ .79a/r and that P25 is ~1"a/r This is prob the reason that I spool a bit later (like 3300-3500 for full spool).

Quote from IHI guy:
"The turbine housing is not available on any production short spec. The 5200IIP25 was tested on the prototype T-bird or Mustang. I don't think you would have any luck trying to get that housing anywhere else."

Compressor side:

More quotes from the IHI guy:
"The compressor was a Subaru prototype when Subaru was still using RHB5 hardware. What we do is put the parts together then scribe or stamp the spec number of the complete turbo on the label plate. If I had left the original Subaru spec on it it wouldn't have matched the complete turbo."

"that is the exact same compressor that came on the VF8. The physical part you have in your hands was ordered for a prototype that we never shipped to Subaru but the compressor spec is that found on the VF8. "

BRLL4625 =
"46=46mm inlet, 25=???, BRLL=Back rake very large. Back rake is how much the exducer tips of the compressor lean back. The more back rake the wider the map and the less pressure ratio. "

Hope this helps you out. From the numbers i've ran this compressor is about perfect for the F2T, I just wish it could handle a bit more pressure ratio, and its just a bit wide for our rpm range - but its better matched than a lot of the turbo people are throwing at the F2T.

SixSick6 · 10-29-08, 6:52

Do you still have pictures?

**n2o_matt** · 10-29-08, 12:42

I don't have any good ones, but here's what I have:

**mx_masta** · 10-31-08, 9:34

Quote:

don't know how i missed this thread... Here is some info that I have on the VF8:

Well part credit goes to you Matt otherwise I wouldn't have know what turbos to look for.

BTW thats a hell nice looking RHB5 you got there!

As you may have read in previous posts between SixSick6 and myself I have been trying to find the BRXLL4726 compressor map with no luck.
You don't by chance have access to it do you?

**AutoGuru** · 10-31-08, 9:59

Only read the first page. Looks nifty.

**n2o_matt** · 10-31-08, 11:41

Quote:

As you may have read in previous posts between SixSick6 and myself I have been trying to find the BRXLL4726 compressor map with no luck.
You don't by chance have access to it do you?

I don't, I'll try and dig that guy's email up and see if I can convince him to send it to me though. Do you know what car the BRXLL4726 comes on? Thats not an RHB5 is it?

**mx_masta** · 10-31-08, 18:38

According to your IHI info & compressor maps FAQ.

It is what should be found in a RHB52 - VF12, as equiped on a Subaru Liberty RS.

**n2o_matt** · 11-1-08, 13:29

interesting - I didn't link BRXLL4726 with the VF12 in my head b/c I was under the impression from that IHI guy that the BRLL4625 was the largest compressor in the RHB5 series. And 47mm > 46mm.

But then again, you measured your compressor to be 45.0mm. Makes me wonder if that really is the right long spec for the VF12. Also, according to the long spec I have listed (10000 3X P20NR BRXLL4726CFZ) the VF12 exhaust wheel should have a 100mm inducer tip width?? That doesn't match up with what you measured.

The problem is, a lot of that info came from different sources, I'm going to try to figure out where i got that long spec and see if the IHI gu can help us out...

**n2o_matt** · 11-1-08, 13:37

Hey, I just realized something - you didn't happen to measure the width, or the "depth" of the exhaust wheel did you? If i'm thinking right, that should be like 10mm and the 5200 wheels should be 5.2mm in "thinkness". That would be why you had to deepen the board by ~5mm. IDK, but i think all RHB52 turbo's are supposed to have the same wheel diameters...

SixSick6 · 11-1-08, 15:06

100mm? Maybe after smoking a big rock of crack, dipped in dogshlt. Not even close. Nowhere near, none of them.

**mx_masta** · 11-1-08, 22:00

Quote:

Hey, I just realized something - you didn't happen to measure the width, or the "depth" of the exhaust wheel did you? If i'm thinking right, that should be like 10mm and the 5200 wheels should be 5.2mm in "thinkness". That would be why you had to deepen the board by ~5mm. IDK, but i think all RHB52 turbo's are supposed to have the same wheel diameters...

Nope I didn't measure the depth of the exhaust wheel.
But I definitely had to open up both the diameter and the board. There is no way that the minor diameters are the same.

**n2o_matt** · 11-2-08, 0:48

Quote:

100mm? Maybe after smoking a big rock of crack, dipped in dogshlt. Not even close. Nowhere near, none of them.

thats what i'm saying, there is no way "10000 3X P20NR" means that 10000 means that the wheel is 100mm in diameter. I previously thought that "5200II=5.2mm inducer tip width" meant wheel diameter and that there was a typo with the decimal. I think that you actually called me out on it some where in the past and thats why I change my web page to say 52mm inducer tip width. Almost all of the info (besides the spreadsheet) on that page is just a compilation of info i've found and copy+pasted.

But now it makes more sense to me:

Dug through the old emails and found this: "The 5200 wheel is 5.2 mm across the tips of the turbine blades."

I think this is talking about the "thinkness" of the wheel. So then, a 10000 3X P20NR would have a 10mm "thick" wheel.

Quote:

But I definitely had to open up both the diameter and the board. There is no way that the minor diameters are the same.

hmm.. maybe they just have the same 52.5 major diameter

**n2o_matt** · 11-2-08, 1:27

Quote:

... I think this is talking about the "thinkness" of the wheel. So then, a 10000 3X P20NR would have a 10mm "thick" wheel...

after thinking about this some more, it sounds pretty impossible. Our exhaust wheel can't be just 5.2mm "thick" - i'm completely lost now

5.2mm shaft di.? I'm just throwing random guesses now... We'll see if i hear anything back from that guy...

**mx_masta** · 11-2-08, 1:15

Maybe it refers to blade tip height? I couldn't tell you the dimensions though.

I have my VJ11 sitting in the garage but there's no way I'm taking out the VF12 to compare it to!

**bpt323** · 11-6-08, 4:34

RHB52XW-100003XP20NRBRXLL4726CFZ

(vf12)