Horsepower: 1025 - 1950

Features

• GEN II COMPRESSOR WHEEL AERODYNAMICS
• 88MM 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
• 88MM SUPERCORE PN: 851285-5015S

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.

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.”

GTX4720R GEN II 88mm

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