If you're looking to crank up the power on your ride, the Garrett G-Series G40-900 Turbocharger is where it's at. This isn't just any turbo; it's a serious piece of engineering that’s built for those who want to push their 2.0 to 6.0-liter engines to the limit. With a 62mm compressor wheel, this unit is designed for quick spooling, meaning you won't be left waiting for the boost to kick in.
One of the standout features of the G40-900 is its G Series compressor aero. It boosts flow by up to 32% compared to the GTX4088R, which is a big deal when you're chasing those high horsepower numbers. On the turbine side, the G Series aero also steps it up with a 16% increase in flow, so you know you're getting the most out of your setup.
Durability is key here. The turbo sports a dual ceramic ball bearing system with steel cages, ensuring it can handle the heat and pressure of high-performance applications. The Inconel turbine wheel, with a 77mm inducer, can flow up to 43 lbs/min, which is more than enough for serious builds. Plus, the lightweight aluminum backplate helps keep the overall weight down without sacrificing strength.
Installation is straightforward, thanks to fully machined speed sensor and pressure ports, along with included water fittings. If you're looking to go for a stainless steel turbine housing, you’ve got options with a T4 twin scroll inlet, which is great for maximizing performance.
When it comes to dimensions, the T4 turbine housing outlet has a V-Band dimension of 117.4mm (or 4.622" OD), which matches up nicely with existing GTX42, GTX45, and G42 models. So, if you're upgrading or swapping out turbos, you won't have to worry about fitting issues.
Here’s a quick rundown of the specs: the compressor wheel inducer is 62mm, and the exducer is 88mm, with a trim of 51. On the turbine side, you’re looking at a 77mm inducer and a 70mm exducer with a trim of 84. The compressor housing A/R is 0.80, which is pretty standard for this level of performance.
For those of you diving into the installation, there are coolant and oil fittings and flanges available to make your life easier. You’ll need two 14mm coolant fittings and lines, along with specific oil feed and drain flanges to keep everything running smoothly. The T4 turbine inlet flange is divided and made of stainless steel, ensuring durability and performance.
In short, the Garrett G40-900 is a turbo that’s built for enthusiasts who want to take their builds to the next level. Whether you're on the street or the track, this turbocharger is ready to deliver the performance you crave.
For more detailed information, check out the Instruction Manual.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Advanced Tuning Products, Inc. (ATP Turbo) is a company that is solely dedicated to turbocharging. Its main goal is to engineer and manufacture quality turbocharging components that deliver a real difference in power gains. Currently located in Hayward, California, ATP Turbo offers an extensive lineup of innovative turbo components, all of which are backed by years of experience and a solid international reputation. The brand’s current lineup includes a wide range of blow-off valves, injectors, adapters, and several other turbo components that are engineered to bring about a significant boost in power.
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