Compressor maps and theory
http://www.stealth316.com/2-3s-compflowmaps.htm

VF10/8/12 Hybrid How-to
http://www.fordlaser.com/forum/viewtopic.php?t=26377

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RHB5 FAMILY TURBO INFORMATION

from Mazda323performance

VJ-6 Very early '85 - '86 BFMR Japanese Imports
VJ-12 Early '86 BFMR Japanese Imports
VJ-13 '86 - '87 BFMR Japanese Imports
VJ-14 American BF Model 323GTX (flows 200 cfm)
These are all about the same size. Only differences are the water lines?

VJ-16 Upgrade turbo available in the US
VJ-17 Group A turbo used in the WRC (no wastegate, external wastegate)
I believe these are both about the same size(larger/freer flowing wheels than the VJ14?). Good for 17psi on a 1.6L
Also heard they have larger bearings?

Smaller to bigger:
VJ20 - BPT turbo, sounds about the same size as the VJ16 or 17, good for 15psi on a 1.8L
VJ11 - MX6/626/Probe

VF10 - Subaru Legacy, VF10 is bigger than the VJ11, VF8 is bigger
VF11- automatic Subaru Legacy, same as t-bird comp?
Warner-Ishi T-bird (flows 381 cfm)
VF8 - Liberty RS (larger turbine housing and wheel?)

VJ23 - 323GTR, BHF6, ball bearing, still kinda laggy, someone's making 400hp with one of these

Hybrids I knows, (coldside/hotside) or (compressor/turbine)...
VJ11/14 - Most popular here in the states, spools up 500rpm quicker than stock, cooler intake temps (for larger comp), I've heard it will do 20psi and 19 till redline
VF10/VJ14 - A little bigger, lags slightly more than stock?
VF8/VJ14 - More lag than stock
VF8/VJ11 - Big dog, 300hp turbo; comparable to a T3?

T-Bird comp/VJ16 turbine (sounds kinda like a VJ20 with a VF10 comp?), Kenny Lew runs this turbo, slightly laggier than stock?

WRX/VJ14 - Matt Manspeaker(yahoo lister) said it was good for 20psi, but he mentioned ball bearings? TDO4 isn't bb?? Maybe he has a new IHI turbo?

Garrett GT/VJ14 - Corksport lists this on their site... I've heard of people using these in Australia and NZ. And yes, I'm 99.9% sure that a GT25/28 will not bolt up to a stock manifold.

Turbine Housings:
Don't know if it refers to a/r or trim?? But it's cast into the side of the housing.
Smaller to bigger:
VJ14/16/17 = 12r (VJ16/17 have freer flowing wheels?)
VJ11?/VJ20/VF10/VF11 = 15r, larger wastegate port? (*note*: the VJ20 does have a larger, octogon-shaped inlet)
VF8 = 20r
VJ23 = ??

VF11 Turbo Specs:
Inlet Diameter: 2"
Outlet Diameter: 1.75"
Air Flow Rate: 1.4 - 10.8m3/min or 49.4 - 381.4ft3/min
Max Pressure Ratio: 2.8
Maximum Speed: 18540rpm
Compressor: 0.4 A/R, 37mm trim
Turbine: 0.52 A/R, 40mm trim
Misc Numbers:
Turbo Spec. VF 119006
Serial No. RHB5 14055W
Parts No. 14412AA070

Warner-ISHI RHB5 (T-bird turbo) Specs:
Air Flow Rate: 1.4 - 10.8m3/min // 49.4 - 381.4ft3/min
Max Pressure Ratio: 2.8
Maximum Speed: 180 x10^3rpm
Max Allowable Gas Temp: 950 oC // 1742 oF
Diesel Engine Application: 54-154Ps
Gasoline Engine Application: 73-208Ps
Flow:381 CFM

The max flow of the VJ20 to be 350cfm. This is based on it being able to hold 12psi at 7000rpm on the 1.8 GTX motor.

It is worthwhile to note that in order to hold 15 psi on the 1.8 litre motor to 7000rpm a turbo needs to flow 385cfm.

As shown below, the VF10/VF11 hybrid which is the easiest turbo upgrade for our cars can supply 381 CFM. It is a mild upgrade but it will hold that 15psi to redline and will hold 17 psi to 6500rpm. Overall it will give a good midrange and topend gain over the VJ20 and can be used with stock GTX engine management (Although at its very limits)

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How to calculate CFM requirements for an engine

For a forced induction engine:

CFM = CID*RPM/3456*(Volumetric efficiency)*(boost%/100 above atmospheric+1)

where

CID = cubic centimeters (cc) * 0.06102
Volumetric efficiency is assume 0.85
Boost --> if you are running 14.7 psi of boost you are running 100% above atmospheric pressure
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