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
Marc,
Did you try the variables at 10lbs of boost? Somewhere I have the
data
showing what it would do at 10lbs of boost based on an actual dyno
run. It
would verify their data.
What turbo do they recommend? Is this info based on a wastegate being
used?
My Dodge Diesel has a Holset turbo on it. Oil cooled. Nobody seems to
be
having problems with it. Have the parts at the house from Banks to
get a
little more oomph (100hp) from the engine.
Thanx for digging this up.
Barny
MGDQ 20bt