L28ET Engine Air Flow and Turbo Compressor Maps

 

Calculations:

280z Displacement = 2.753 litres = 168.00 cubic inches

 

Air flow equals:  Cid X  RPM X 0.5 X Ev
                                     1728

For 6500 redline and Ev = 0.80: 

Air flow equals:  168 X  6500 X 0.5 X 0.80   = 252.78cfm
                                     1728

1lb/min = 14.472 cfm 

so 252.78cfm = 17.47 lbs/min

 

air flow at boost = stock air flow X pressure ratio

Pressure Ratio = (boost + 14.7)
                               14.7

So for 20psi of Boost @ 6500rpm:

Air flow = 252.78 X (20+14.7) = 596.69cfm  or  41.23lbs/min 
                               14.7

 

Air Flow Data in Table Form for different levels of boost: (both cfm and lbs/min)

  Air Flow (cfm)
RPM Stock (0psi) 7psi 10psi 16psi 20psi
6500 252.78 373.14 424.73 527.90 596.69
6000 233.33 344.44 392.06 487.30 550.79
5000 196.87 290.62 330.80 411.16 464.73
4000 159.44 235.37 267.91 332.99 376.37
3250 131.13 193.57 220.33 273.85 309.53
3000 122.50 180.83 205.83 255.83 289.16
2000 81.67 120.55 137.22 170.55 192.78
1000 41.32 60.99 69.43 86.29 97.54
700 28.92 42.70 48.60 60.40 68.27
20% of Redline Flow 50.56 74.63 84.95 105.58 119.34

Calculated L28ET air flow in CFM using Ev 0.85 to 0.80

 

  Air Flow (lbs/min)
Pressure Ratio 1.48 1.68 2.09 2.36
RPM Stock (0psi) 7psi 10psi 16psi 20psi
6500 17.47 25.78 29.35 36.48 41.23
6000 16.12 23.80 27.09 33.67 38.06
5000 13.60 20.08 22.86 28.41 32.11
4000 11.02 16.26 18.51 23.01 26.01
3250 9.06 13.38 15.22 18.92 21.39
3000 8.46 12.50 14.22 17.68 19.98
2000 5.64 8.33 9.48 11.79 13.32
1000 2.86 4.21 4.80 5.96 6.74
700 2.00 2.95 3.36 4.17 4.72
20% of Redline Flow 3.49 5.16 5.87 7.30 8.25

Calculated L28ET air flow in lbs/min using Ev 0.85 to 0.80

 

 

Air Flow Data Plotted Against Different Boost Levels (Pressure Ratio vs. lbs/min)

L28ET air flow in lbs/min at  10, 16 and 20psi (1.68 / 2.09 / 2.36BAR) of boost

 

 

Air Flow Data Plotted Against Different Boost Levels and Transcribed to "Stock" Garrett T3-60 Compressor Map (Pressure Ratio vs. lbs/min)

 

Air Flow Data Plotted Against Different Boost Levels and Transcribed to Garrett T61 Compressor Map (Pressure Ratio vs. lbs/min)

 

 

Air Flow Data Plotted Against Different Boost Levels and Transcribed to Garrett T04E-50 Compressor Map (Pressure Ratio vs. lbs/min)

 

Air Flow Data Plotted Against Different Boost Levels and Transcribed to Garrett GT35R Compressor Map (Pressure Ratio vs. lbs/min)

 

 

Air Flow Data Plotted Against Different Boost Levels and Transcribed to Garrett T04B-60-1 Compressor Map (Pressure Ratio vs. lbs/min)

 

 

 

 

 

 

 

 


 

 

 

 

 

 

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