Features
- GEN II COMPRESSOR WHEEL AERODYNAMICS
- 76MM COMPRESSOR INDUCER | 120MM COMPRESSOR EXDUCER
- 93MM TURBINE INDUCER | 84MM TURBINE EXDUCER
- 9% INCREASED COMPRESSOR FLOW
- LARGER .88 A/R COMPRESSOR HOUSING VOLUTE
- GTX4720R FEATURES A 120mm COMP EXDUCER ( + 2 mm) AND HAS 30% LOWER INERTIA COMPARED TO GTX4718R
- SUPERCORE AND TURBINE HOUSING SOLD SEPARATELY
- COMPATIBLE WITH GT AND GTX TURBINE HOUSINGS
- 76MM SUPERCORE PN: 851285-5013S
WARNING: Maximum allowable turbocharger speed is 85krpm. The use of this product above max turbocharger speed is at the owner’s risk, and can result in damage and premature failure. To protect the turbocharger from overspeed when operating, a speed sensor can be installed into the compressor housing to monitor shaft speed. Sensors sold separately. (click here for details)
Performance results of this product are highly dependent upon your vehicle’s modifications and tuning/calibration. The horsepower numbers represented above are calculated based strictly on choke flow of the compressor map (total turbo capability), which represents the potential flywheel horsepower.
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IMPORTANT PRODUCT INFORMATION
“Garrett Performance Kits are professional aftermarket products only designed for certain racing vehicles driven on particular racing tracks and shall only be used on racing vehicles that will never be driven on public roads or highways. Garrett Performance Kits are not legal for the use in vehicles on public roads or other roads to which public road law applies. Any vehicle modifications using Garrett Performance Kits are AT YOUR OWN RESPONSIBILITY and AT YOUR OWN RISK. Only use Garrett Performance Kits in compliance with all applicable laws, regulations, and ordinances (including but not limited to emission, noise, operating license, performance, safety, and type-approval aspects). A vehicle modification using Garrett Performance Kits may particularly affect or void a vehicle’s warranty, operating license or type-approval. Moreover, only use Garrett Performance Kits in compliance with all applicable racing and racing track provisions. It is YOUR OWN RESPONSIBILITY AND RISK to ensure that your Garrett Performance Kit fits your vehicle and area of application. YOU MUST ENSURE LAWFUL AND SAFE OPERATIONS AT ANY TIME. You should particularly consult the owner’s manual and service manual of your vehicle. You should also contact your vehicle’s manufacturer to determine what effects modifications may have on important aspects such as safety, warranty, performance, etc. Only install and use Garrett Performance Kits if you have fully read and understood this important safety information and if you fully agree with the terms and conditions set forth therein.”
Learn More About Race Vehicle Setups
How To Select A Turbo Part 1
With over 35 Garrett turbos to choose, how do you select the right one? This provides some insight into the complicated process.
How To Select A Turbo Part 2: Calculations
Turbo any engine once you apply these calculations. Find the compressor that matches your inputs and you are on your way to turbocharging any engine
Diesel Tuning Tips From High Performance Academy
Ever wondered what’s different about tuning diesel engines? The team at HP Academy cover some of the basics in this diesel turbo tech writeup
Turbo Tech: Compound Turbo Systems
Compound turbo systems use different size turbos and operate in series where the first turbo feeds the second turbo boosted air and the effect is compounded
GTX4720R GEN II 76mm
Reference Data
| GTX4720R GEN II | Compressor | Turbine | ||||||
|---|---|---|---|---|---|---|---|---|
| HP: 1025-1950 Disp: 2.5L-10.0L | Inducer | Exducer | Trim | A/R | Inducer | Exducer | Trim | |
| Supercore | PN | |||||||
| 851285-5013S | 76mm | 120mm | 41 | 0.88 | 93mm | 84mm | 82 | |
| 851285-5014S | 80mm | 120mm | 45 | 0.88 | 93mm | 84mm | 82 | |
| 851285-5015S | 88mm | 120mm | 54 | 0.88 | 93mm | 84mm | 82 | |
| Turbine Kits: GTX47 | PN | A/R | Inlet | Outlet | Wastegate | Divided | ||
| Interchangeable with GT|GTX 4708 4709 4718 4720 Supercores | 761208-0010 | 1.08 | T6 | V-Band | Free Float | N | ||
| 761208-0011 | 1.23 | T6 | V-Band | Free Float | N | |||
GTX4720R GEN II 76mm
Compressor Map & Exhaust Flow Chart
Compressor Map
Exhaust Flow Chart
Gen II Compressor Wheel Dimensions and Aerodynamics
GTX4720R Available in 76mm, 80mm, and 88mm inducer diameters
- Comp exducer is now 120mm (+2mm vs Gen 1)
- Gen II wheel produces 9% more air flow
- 30% lower inertia
- Reduced inertia due to reduction of material in the hub and blades
- Roughly 20% lower mass
- Lower inertia helps make boost faster and increases overall turbo efficiency
- Increased flow has potential to make more power at same boost or same power at lower boost levels
Larger Comp Exducer on Gen II
.88 A/R Compressor Housing
Gen II features a larger .88 A/R (Gen I .69 A/R)
- This helps maximize the power capacity of the new compressor wheel.
- This is also the same compressor housing used on the GTX5533R (85mm and 88mm)
Larger Compressor Volute
.88 A/R Compressor Housing
Gen II features a larger .88 A/R compressor housing that will cause an increase in outline dimensions only on the cold side of the turbo.
- +6mm longer on the comp outlet Fig. A
- +10mm longer on the comp inlet Fig. B
- Comp outlet diameter 107mm (same)
- Not outline interchangeable with gen 1
Dimensional Compressor Measurements vs. Gen I
Additional Features
- Lightweight billet backplate
- (NEW) Backplate to compressor housing O-ring
- Speed sensor port compatible only with new flange style speed sensors: (pn 781328-0003 Street Kit | pn 781328-0004 Pro)
Compatible only with New G Series Speed Sensor
