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Turbo Size Comparison
Here's a comparison chart of turbo compressor wheel and turbine wheel. Not necessarily sorted by size and power.I did not list the horsepower rating of the turbos. It depends many variables. Only listed by compress flow in CFM. Some cfm listed are max flow. Others are listed at 2 pressure ratio (PR) or at 14.7psi at sea level. Note: some turbos come as a bolt-on kit. Some do not, marked by '*'. Specs are not limited to the chart listed below for those none-bolt-on turbos.
Disclaimer: Greddy modifies Mitsubishi turbos. Due to lack of factory data, all Greddy turbo specs here are referenced using Mitsubishi specs. It may not be accurate. This chart is just informational, use at your own risk. |
|
| Turbo |
Compressor |
Turbine |
|
Wheel Trim
map avail |
Inducer
Diameter
(in./mm) |
Exducer
Diameter
(in./mm) |
Housing |
CFM
|
Wheel
Trim |
Exducer
Diameter
(in.) |
Inducer
Diameter
(in.) |
Flange style,
Housing size |
|
Stock TB02/22 |
T2 |
1.57"/40mm |
2.02"/51mm |
TB22 |
304
max |
T22
69 |
1.53"/38.9mm |
1.85"/47mm |
T25 |
|
Garrett T25 |
T25
60 |
1.66"/42mm |
2.14"/54.4mm |
TB25 |
405
max |
T25
62 |
1.64"/41.7mm |
2.09"/53mm |
T25 |
|
Garrett T28 |
T3
60 |
1.83"/46.5mm |
2.37"/60mm |
TB03 |
448
max |
T25
62 |
1.64"/41.7mm |
2.09"/53mm |
T25 |
|
JWT 500 |
|
1.53"/38.9mm? |
2.06"/52mm? |
TB22 |
|
T25 |
1.59"/40.4mm |
1.83"/45.7mm |
T25 |
|
JWT 530BB
GT25R/GT2554R |
GT25R 60 |
1.65"/42mm |
2.14"/54.3mm |
GT25R |
|
GT25
62 |
1.64"/41.7mm |
2.09"/53mm |
T25
.64 A/R |
|
JWT 600 |
T3? 60? |
1.83"/46.5mm |
2.37"/60mm |
TB25 |
|
|
1.86"/47.2mm |
2.09"/53mm? |
T25 |
|
JWT 650 |
T3
63 |
1.89"/48mm |
2.37"/60mm |
T3 |
506
max |
T3 |
1.86"/47.2mm |
2.09"/53mm |
T25 |
|
JWT 700 BB
GT28RS/GT2860R |
GT28RS
62 |
1.86"/47.2mm |
2.37"/60mm |
GT28RS |
535
max |
GT28
76 |
1.85"/46.9mm |
2.09"/53.9mm |
T25
.86 A/R |
|
GT2871R |
GT2871R 48 |
1.94"/49.2mm? |
2.79"/71mm? |
GT28RS |
599
max |
GT28
76 |
1.85"/46.9mm |
2.09"/53.9mm |
T25
.86 A/R |
|
PE
1420 |
?
57 |
1.79"/45.5mm |
2.37"/60mm |
? |
494
max |
P20
84 |
1.73"/44 |
1.89"/48mm |
? |
|
PE
1820 |
?
55 |
2.07"/52.5mm |
2.76"/70mm |
? |
635
max |
P20
84 |
1.74"/44.7 |
2.047"/52mm |
? |
|
Greddy TD04H-15C |
15C
55 |
1.65"/42mm |
2.187"/55.5mm |
TD04 |
|
TD04H |
1.74"/44.7 |
2.047"/52mm |
TD04H
3bolt |
|
Greddy TD05-16G |
16G
60 |
1.83"/46.5mm |
2.236/57mm |
TD05 |
520
@2PR |
TD05H |
1.93"/49mm |
2.20"/56mm |
TD05H
6,7,8cm2
3bolt |
|
Greddy TD05-18G |
18G
50 |
1.99"/50.5mm |
2.68/68mm |
a* |
?
@2PR |
TD05H |
1.93"/49mm |
2.20"/56mm |
TD05H
6,7,8cm2
3 bolt |
|
b* Greddy TD06-20G |
20G
60 |
2.07"/52.6mm |
2.68"/68mm |
TD06 |
685
max |
TD06S |
2.17"/55.1mm |
2.56"/65mm |
TD06S
8,10cm2
3 bolt |
|
HKS GT2530 |
GT28RS
63 |
1.90"/47.7mm |
2.37"/60mm |
T3
63 |
477
max |
GT25 |
1.85"/47mm |
2.12"/54mm |
T25 .64 A/R T3 |
|
HKS GT2540 |
T04E
46 |
2.1"/51.7mm |
3"/76mm |
To4E
46 |
564
@2PR |
GT25 |
1.85"/47mm |
2.12"/54mm |
.64 A/R |
|
b*HKS GT2835 d* |
GT35
52 |
2.01"/51.2 |
2.79"/71mm |
GT35 |
608
max |
GT28 |
2.01"/51.8mm |
2.23"/56.5mm |
T25
.61, .73 |
|
c*HKS GT3037 d* |
GT37
52 |
2.17"/55mm |
3.00"/76mm |
GT37 |
709
max |
GT30 |
2.16"/55mm |
2.36"/60mm |
T25
|
|
Garrett GT3071R |
GT37
56 |
2.08"/53mm |
3.00"/71mm |
GT37 |
694
max |
GT30 |
2"/50.8mm |
2.22"/56.5mm |
T25 flange
.86 A/R |
|
Garrett GT3076R |
GT30R
56 |
2.24"/57mm |
3.00"76.2mm |
GT37 |
752
max |
GT30 |
2.16"/55mm |
2.36"/60mm |
T3flange
.82, 1.06 A/R |
|
*Turbonetics T3/To4B |
To4B
S |
1.90"/48.2mm |
2.75"/70mm |
To4B
S |
520
@2PR |
T3 |
2.05"/52.1mm? |
2.35"/59.7mm? |
T3 |
|
*Turbonetics T3/To4E |
To4E 60 |
2.29"/58.2mm |
2.95"/75mm |
To4E
60 |
650
@2PR |
T3 |
2.05"/52.1mm? |
2.35"/59.7mm? |
T3 |
|
a Apperantly some TD05-18G kit has just the bigger 18G wheel inside a TD05 compressor housing while other TD05-18G has bigger 18G wheel and TD06 compressor housing.
b Pentroof of Japan offers kit for TD06 and 2835 for Z32s. Custom made to your specifics.
c Escort of Japan offers streetable kit of HKS GT3037.
d HKS offers the 'R' version of 2835. 2835R has bigger 100mm compressor inlet. Also, there's a 'S' version of 3037. 3037S also has bigger 100mm compressor inlet. The Pentroof 2835 kit is the regular version with 70mm inlet. The pro version uses internal wastegates. |
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Volumetric Efficiency
|
Actual
CFM |
= Volumetric Efficiency |
|
Theoretical CFM |
|
Volumetic Efficiency or VE, I will be using from this point, varies depending
on temperature and pressure.
From that, we know a normally aspirited engine will have VE of 100% or
less. And force inductioned engine will have VE of 100% or more.
The actual calculation of VE is done by ECU using measured amount of intake
air, with Mass Air Sensor measuring at intake pipe or Speed Density measuring inside the intake manifold (close to intake
port of the engine).
theoretical cfm = rpm x displacement / 3456
Engine Flow= (engine displacement) X (volumetric efficiency) X (engine speed)
X (manifold pressure)
You can see the key to increase engine flow is to increase engine VE
(volumetric efficiency). Reduce intake charge temperature is the easiest way to help increase engine VE. This is where air/air,
air/fluid intercooler and water injection come into play.
Assuming VE at 100%, 1 atmosphere pressure, we have the following table
for a 3.0L engine flow( CFM) at various rpm and pressure point.
- Influence of the altitude above Sea Level on the
Volumetric Efficiency
|
Influence
of the elevation above Sea Level on the Volumetric Efficiency
Atmospheric
pressure as given by average barometer reading |
| Height
above sea level, ft. |
Atmospheric
pressure, in. of mercury |
Atmospheric
Pressure, in PSI (approximate) |
Relative
volumetric efficiency |
| 0 |
29.92 |
14.7 |
1.000 |
| 1,000 |
28.85 |
14.2 |
0.965 |
| 2,000 |
27.82 |
13.7 |
0.931 |
| 3,000 |
26.82 |
13.2 |
0.892 |
| 4,000 |
25.85 |
12.7 |
0.865 |
| 5,000 |
24.92 |
12.2 |
0.833 |
| 6,000 |
24.00 |
11.7 |
0.803 |
| 8,000 |
22.17 |
10.7 |
0.742 |
| 10,000 |
20.34 |
8.7 |
0.681 |
| 12,000 |
19.30 |
6.7 |
0.645 |
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