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Matt's IHI Turbo Page

IHI = Ishikawajima-Harima Heavy Industries.

Turbo Sizing Work Sheet:

I made this excel spread sheet to plot points on a compressor map. You input variables such as boost, displacement, air temps, VE, ect. and it spits out a pressure ratio and flow rate (m^3/min and lb/min)at multiple rpms. This is not an exact science but is the best i've seen so far (and not bad for an 18 yr old kid). The formulas i used were found in multiple web sites and magazines. All the formulas are documented in the cell's notes. Have fun....

*UPDATE Ver.1.2* - i added a simple conversion box that converts flow rates from m^3/min to cfm. You can use this if you ever want to compare our maps to people's cfm claims on other turbos. The maps have been added to the file as well as a description of how to use them. Just scroll down in the spread sheet. I hope this is usful to some one, i know it was for me!

*Update 7.12.05 V1.3* - just a few changes to make it easier to understand - i've been getting a bunch of emails with questions. Best advise is to read the cell comments. Save As...

*old ver: 1.2* - if i'm out of bandwidth:
click here

*updated: 3/6/2011*

I know what you're all thinking - what am i going to do with all this info - its just numbers. Well for the first time ever - as far as I know - I have acquired the compressor maps for the stock compressor and the T-bird.**EDIT - NOT T-bird map, see below** I've had these for a while now but i just can't keep these to myself, I feel like Iím cheating the rest of you after all I have learned from you guys. I only hope that my findings will benefit this great community of car enthusiasts.

ok - enough of the BS - here are the maps:

The stock compressor - (spec: BRL3911) - | -
*NEW* - if i'm out of bandwidth click the thumnial:

OR Save As...

The *NOT* T-bird compressor - (spec: BRL4219) - | -
**EDIT** - This turns out NOT to be the T-bird compressor map, but instead a VM9 from a Maserati (41.3/52.5mm compressor), sorry for the confusion! However it should be pretty close to an actual tbird map since its compressor is 39/52.5mm)
If i'm out of bandwidth click the thumnial:

OR Save As...

General IHI turbo Info:

Here is some good info revealed about our turbine from the casting numbers:
I don't know if the 2, K or OD mean anything but 52 means a 5200 wheel the 20 is the a/r and R5 is the material which is D5-niresist or high temp material for gasoline(not diesel). The 5200 wheel is 52mm (52.5mm to be exact per sixsick6) wide at the inducer tip. The minor diameter of the VJ11 turbine is 43mm. (42.4 from Sick: )

For IHI, the A/R(Pxx) is in mm2/mm. It can be converted and compared to other turbines, which are more typically in2/in. [example: Just divide it by 25.4 to get the "real" A/R, for example, if you have a p20 it's what Garrett would call a 0.78 A/R housing.]

More good info about IHI turbos and their names/spec #'s:

The VI-34 (Isuzu Impulse (Piazza) turbo) number is called a short spec. V=Vehicle I=Isuzu (don't know about our "J" or "F") 34=the first 2 numbers in the long spec. The long spec is actually the part number on the IHI bill of materials or the list of parts that make up the turbo right down to the snap rings, nuts and bolts. RHB5 is typically called the frame size. RH=Right Hand(the direction the wheel rotates) B=Generation( IHI is now on F in 2005) 5=size range(5 is approximately 80hp to 250hp) Within a frame size things like shaft diameter and bearings are common.

Compressors: EX. mx6 stock compressor - VJ11 (spec: BRL3911) 39=39mm inlet *this doesn't seem to hold true for all compressor specs*, 11=???, BRL="Back Rake large" (BRLL - would be "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.

Turbine wheels: 5200II=52mm inducer tip width. II=revision 2. I think all RHB5 turbines are 52.5mm the inducer and 43 or 46.5mm in outlet diameter. The RHB5 turbos have several A/R's for the 5200II turbine wheel: P9,P12,P15,P20 or P25 A/R turbine housing. Each increase in A/R shift the turbine hook to the right a little on the map. In engine terms the larger the a/r the more lag and more top end.

RHB5 is a IHI frame size that was used in many turbos:
The RHB52w is found in our Mx6/Probe's with the VJ11 from 89-91. A Warner Ishi RHB52w was also used in the TBird from 87-88 (VC32M -for manual trans and (VC32A) for auto) *(NOT a VJ17 which are from the non-U.S 323 GTX)*. Other RBH52w's include: 85-90 Isuzu I-Mark (VI-55), 84-87 Isuzu Impulse(Piazza)(VI-34), 90-94 Subaru Legacy (VF-11) and all 1.8L T subarus from 86-91. The VJ20 is in the 1.8L Mazda GTX the 88-98 1.6L 323 had a VJ-14 and the 86-87 2.0L 626 had a VJ-5.

The RHB52 was used in the 84-86 turbo Escorts(VC-31), the 88-89 Chevy Spectrum (VI-55), 91-94 Ford Laser-Capri (VJ-14), 84-95 Mercury Lynx (VC-31), Ferrari 208, and Bugatti EB110(x4). Fiat used them and it's a popular turbo for motorcycles. It was also going to be used in a TT version of the DeLorean, but the company supplying the parts went out of business before they could build them.

The RHB51w is found in the 84-91 Maserati BiTurbo(VM-3 and VM-4)

Some known RHB52 part numbers:
subaru turbos:
VF10 - RHB52XW - 5200 2 P15NR BRXLL4225CFZ 39.5mm/56mm
VF11 - RHB52XW - 5200 2X P15NR BRLL4016EZ 37.5mm/52.5mm
VF8 - RHB52XW - 10000 3X P20NR BRXLL4625CFZ 43.5mm/56mm
VF12 - RHB52XW - 10000 3X P20NR BRXLL4726CFZ 45mm/56mm

Isuzu turbos:
VI34 - RHB52A-10000 3 P25NR BRL3911EZ
VI37 - RHB52W-10000 3 P25NR5 BRL3911EZ
VI23 - RHB52A-10000 3 P25NR BRL3911EZ

and the mazda turbos:
VJ11 - RHB52KW - 5200 2K P20NR5 BRL3911EZ 38mm/52.2mm
VJ14 - RHB52MW - 5200 2M P12NR5 BRKL3711EZ
VJ16 - RHB52MW - 5200 2M P15NR5 BRKL3911EZ
VJ17 - RHB52BW - 10000 3B P25NR5 BRL4016EZ
VJ20 - RHB52UW - 5200 2U P15NR5 BRUL3911EZ 36.5/52.5mm

Here's a TON more I found:

More RHB5 compressor/turbine dimensions:

The 1000 series turbines seem to have 46.5mm exducers and the 5200 with 43mm exducers
A "W" on the end means it is a water-cooled center section.

Links - Mx6 devoted forum - good formulas
BorgWarner Turbo Matching *GOOD*