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GTX4709R GEN II Turbocharger 76MM

Horsepower: 825 - 1575

Displacement: 2.0L - 10.0L


  • 76mm compressor inducer | 109mm compressor exducer
  • 93mm turbine inducer | 84mm turbine exducer
  • 76MM SUPERCORE PART NUMBER: 851285-5011S

WARNING: Maximum allowable turbocharger speed is 102.5krpm. 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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“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.”

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GTX4709R GEN II 76mm

Reference Data

GTX4709R GEN II Compressor Turbine
HP: 825-1625  Disp: 2.0L-10.0L Inducer Exducer Trim A/R Inducer Exducer Trim
Supercore PN
851285-5011S 76mm 109mm 49 0.88 93mm 84mm 82
851285-5012S 80mm 109mm 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

GTX4709R GEN II 76mm

Download Section

File Name Link View
Configuration Guide Download View
File Name Link View
Compressor Map Download View
Exhaust Flow Chart Download View
Product Photo Download View
Flange Diagram Download View
Speed Sensor Kit Installation Instruction Download View

GTX4709R GEN II 76mm

Compressor Map & Exhaust Flow Chart

Compressor Map

Exhaust Flow Chart

Gen II Compressor Wheel Dimensions and Aerodynamics

GTX4709R Available in 76mm and 80mm inducer diameters

  • Comp exducer is now 109mm (+1mm vs Gen I)
  • Gen II wheel produces 15% more air flow
  • 39% lower inertia

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

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