| Subject: Turbo charger matching program |
| From: ACRE |
| Date: 12/17/2004, 9:17 AM |
Some time ago, an individual wrote a turbo matching program that input variables so that you could somewhat pick a turbo from his included MAPS. It even has a box for rotaries, efficencies, etc. Have you critiqued this program, Paul? It is called TurboCalculator. Anyhow, messing with it, using a 20B engine, the attached turbo came up as shown, it is a Holset HX series Hx25hx25W, whatever that is. The second chart is at an atmospheric pressure of 8 psi, if I rememeber correctly. It allows intercooler performance effeciencies, pressure drops, volumetric efficencies, etc to be thrown in the mix. The dots are at different rpms of the engine...... Marc Wiese
20B turbo map, Holset
Report Generated by TurboCalculator v1.0
Using turbocalculator at 80% efficency
[Image]
RPM Boost Vol Eff Comp Eff IC Eff Lbs/min
PSI
1000 12.0 80 65 60 5.4
2000 12.0 80 65 60 10.9
3000 12.0 80 65 60 16.4
4000 12.0 80 65 60 21.9
5000 12.0 80 65 60 27.3
!
Engine Size: 105 cid Number of Turbos: 1
NA Horsepower: 220 hp Turbocharged HP: 340hp
Pressure Drop at IC: 2.0 psi Pressure Drop at Inlet: .5psi
Barometric Pressure: 14.7 psi Intake Temperature: 85 F
Charged Air Temp: 203 F Manifold Temperature: 132F
Hx25Hx25W holset
Report Generated by TurboCalculator v1.0
At 8 psi barometric pressure
[Image]
RPM Boost Vol Eff Comp Eff IC Eff Lbs/min
PSI
1000 12.0 80 65 60 3.7
2000 12.0 80 65 60 7.5
3000 12.0 80 65 60 11.3
4000 12.0 80 65 60 15.1
5000 12.0 80 65 60 18.9
8.0
Engine Size: 105 cid Number of Turbos: 1
NA Horsepower: 220 hp Turbocharged HP: 433 hp
Pressure Drop at IC: 2.0 psi Pressure Drop at Inlet: .5 psi
Barometric Pressure: psi Intake Temperature: 85 F
Charged Air Temp: 279 F Manifold Temperature: 163 F
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