Garrett GT Turbos
 

Garrett claims the GT series turbos are much better then the old school T series.  They claim the GT turbos will spool about 1,000 rpm lower then the previous generation.  Here are the Specs of each turbo and compressor map.  I also included the 1UZFE to 3UZFE Airflow.

Here are the Air Flow Chart for the UZFE:
Here is the spread sheet of 1UZ to 3UZ Air Flow Chart
 

Engine Liter Cubic Inch Air flow Static 6 psi 8 psi 10 psi 12 psi 14 psi 16 psi 18 psi 20 psi 22 psi 24 psi 26 psi 28 psi 30 psi 32 psi 34 psi
1UZFE (AirFlow) 4 244 367.26 cfm 35.74 39.08 42.633 46.044 49.4905 52.937 56.3835 59.83 63.2765 66.723 70.1695 73.616 77.0625 80.509 83.9555
2UZFE(AirFlow) 4.7 286.7 431.38 cfm 42.03 45.9 50.08 54.05333 58.07833 62.10333 66.12833 70.15333 74.17833 78.20333 82.22833 86.25333 90.27833 94.30333 98.32833
3UZFE (AirFlow) 4.3 262.3 394.66 cfm 38.45 42 45.81 49.44667 53.12667 56.80667 60.48667 64.16667 67.84667 71.52667 75.20667 78.88667 82.56667 86.24667 89.92667
Pressure Ratio     1.41 1.54 1.68 1.816 1.95 2.086 2.2216 2.3572 2.4928 2.6284 2.764 2.8996 3.0352 3.1708 3.3064
                                   
                                   
Air Flow Formula                                  
                                   
Air flow equals: Cid X RPM X 0.5 X Ev divided by 1728                          
                                     
                                     
For 6500 redline and Ev = 0.80:                              
                                     
Air flow equals: 244.09.07 X 6500 X 0.5 X 0.80 = 367.26cfm divided by 1728                      
                                     
1lb/min = 14.472 cfm                                
                                     
so 367.26cfm = 25.37 lbs/min                                
                                   
Air flow at boost @ 6500rpm:                                
                                   
Air flow = 367.26 X (15+14.7) divided by 14.7 = 742.01cfm or 51.27lbs/min                       
                                   
1lb/min = 14.472 cfm                                
                                   

Here is the Specs of GT Turbos:
 

Garrett GT Turbos
  Compressor Specs CHRA Turbine Specs
Max. Rated HP Part No. Wheel Dia. Wheel Trim A/R Ratio Bearing System Wheel Dia. Wheel Trim A/R Ratio
130 GT-12 41mm 50 .38 Standard 35.5mm 72 .43
220 GT-15 45mm 60 .48 Standard 41.2mm 72 .35
260 GT-20 56mm 55 .53 Standard 47mm 72 .46
280 GT-22 52mm 60 .51 Standard 50.3mm 72 0.56, 0.67
280 GT-22 59.41mm 52 .42 Standard 50.3mm 72 0.56, 0.67
320 GT-28R Call CALL .6 Ball Bearing 50.3mm 62 .64
500 GT-30R 76.2 mm 56 .6 Ball Bearing 60mm 84 CALL
520 GT-32 71, 76mm 52 .5 Standard 64 mm 73 .78
660 GT-35 71, 76mm 52 .50, .60 Standard 68mm 84 1.18
680 GT-35R 82mm 56 .7 Ball Bearing 68mm 84 0.82, 1.06
700 GT-37 76mm, 82mm 52 .54, .70 Standard 72.5mm 84 1.12
750 GT-40 82mm, 88mm 50, 54 .58, .72 Standard 77mm 73, 84 0.94, 1.34
1100 GT-42 94mm, 102mm 53, 56 .6 Standard 82mm 84 1.15
1100 GT42R 94mm, 102mm 53, 56 .6 Ball Bearing 82mm 84 1.15
2200 GT-60 141mm 56 1.05 Standard 130mm 84 1.47

To match the perfect setup for your horse power needs.  Just match the above air flow chart with the approperaite engines and the boost u want to run.  The airflow (Text in Red) and pressure ratio (Text in Blue).  The Pressure Ratio is on the right side of the chart and the flow rate at the bottom of the map.  For example 8 psi is your goal for the 1UZFE (SC400, LS400 or Crown). Here is your air flow and pressure ratio:

Pressure Ratio:39.08
Air Flow for 1UZ @ 8 psi:1.54 

To learn more about "how to read compressor maps"

Here are the compressor maps:

This is a freelance site and its not supported by huge companies.  I have been doing most of the R&D and technical write-ups by myself with my personal money.  I have taken extra steps to demonstrate in details how things are done.  Currently I am one of the few people doing Lexus V8 research and performance enhancement.  This effort comes from my personal love for this wonderful engine.  Most of the modifications are from trail and errors.  There is no cook book for the 1UZFE modifications and its a virgin territory for performance.  Most of the parts, labor, web development and site hosting are from my personal hobby money.  If you feel my effort help you in any form, please do not hesitate to donate any amount of money to support this site.