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What are (twin turbos) vs (compound turbos) and what is the advantage of two turbos over one turbo? This is a commonly asked question.

TWIN TURBOS
Twin turbos are typically used on V6 and V-8 gas engines. Twin turbos simply mean there are two turbos that are virtually identical in size, one turbo is fed from the right bank of the engine and the other is fed from the left bank of the engine. The two (twin turbos) are just splitting the load of what a single turbo charger would normally handle. When the turbo chargers are configured in this manner they act as one, they are driven from each bank of the engine or an equal set of cylinders and the compressor boost is combined into one tube feeding the engine. This configuration is almost always used exclusively in gasoline engines and almost never on Diesel engines. Gas engines will not support the high boost pressures that a Diesel engine will, when the turbos and staged in a twin configuration the inertia is less which allows the two turbo chargers to spool quicker providing less turbo lag. Having two smaller turbos do the work of one bigger turbo has the advantage of quicker boost response, this does not necessarily make more power or higher boost levels.

COMPOUND TURBOS
Compound turbos are placed in a staged configuration where the small turbo is fed by the engine exhaust first, then the big turbo charger is fed from the exhaust of the small turbo charger. The two turbos basically extract the energy from the exhaust flow and then turn it into mechanical energy that spins the compressor of the turbo charger. As the engine increases in exhaust flow the small turbo charger reaches its max rated RPM, at this point the vanes of the VGT (Variable geometry turbo) open reducing the speed of the compressor wheel. When the small turbo charger has a fixed geometry turbo (Meaning there are no vanes in the turbine housing) the waste gate opens, slowing the compressor wheel of the small turbo charger. Regardless of the method used the vanes or the waste gate also bypass exhaust pressure around the small turbo feeding the large turbo. This allows the small turbo to maintain a safe RPM while still compression air that is fed to the engine. The term compound come from the action that happens when the air is compressed for the second time as it passes through the compressor wheel of the small turbo. First air is pulled from the atmosphere from the big turbo charger and it is compressed as it passes through the compressor wheel, the compressed air is then fed directly into the compressor wheel of the small turbo charger. This is referred to as compounding. The major advantage of using the compounding method to compress air is both compressor wheels do not need to spin at an excessively high RPM. This allows the air to compress much more efficiently providing a cooler air charge. Cooler air charge equals more air density which equals more oxygen in the cylinder to burn the Diesel fuel which equals more power, lower exhaust temperatures and a much more efficient burn. Compound turbo charging provides quick turbo response because the small turbo charger is typically small in size, compounding also allows for very high boost levels that the Diesel engine needs to produce high power levels. Typical compound turbo charger systems allow very safe power levels of 650 to 850HP on stock Diesel street engines. Achieving power levels of up to 700HP on todays emissions on Ford, Cummins and Duramax engines is common place these days.

ATS Compound turbo configurations

ATS Plus Kit - Use your factory stock turbo charger (Small turbo), usually a VGT and add an Aurora turbo charger (Big turbo) if front of the small turbo to create a compound effect. The Aurora Plus turbo kits are all emissions on and work great with all emissions components. They will work on vehicles that have had the emissions components previously removed as well.

ATS Compound Kit - Uses a small Aurora turbo charger as the small turbo charger, usually an Aurora 3000 or Aurora 4000 turbo and the large turbo charger is an Aurora 5000, 6000 or 6500. All ATS compound turbo kits also come with a waste gate to regulate turbo speed and exhaust pressure.

Vehicle specific configurations

Ford 2011 to 2014 6.7L
    Plus Kit
Must replace the factory VGT (Variable Geometry Turbo) with a 2015 or newer VGT then you can add the second Aurora 6000 to it. This is a requirement to retain all of the factors emissions. This kit supports 650HP with stock injectors and all emissions on.
    Compound Kit
Stage1. Replace the factory VGT with an Aurora 3000 turbo (small turbo) and Aurora 6000 (Big Turbo) This kit supports 800HP. Power levels go up when larger injectors are installed and an ATS twin fueler is installed.

Stage 2. Replace the factory VGT with an Aurora 4000 turbo (small turbo) and Aurora 6500 (Big Turbo) This kit supports 900HP with stock injectors. Power levels go up when larger injectors are installed and an ATS twin fueler is installed.

Ford Powerstroke 2015 to 2018 6.7L
    Plus Kit
Uses the factory VGT (Variable Geometry Turbo) and add the second Aurora 6000 to it. This kit supports 650HP with stock injectors and all emissions on.
    Compound Kit
Stage1. Replace the factory VGT with an Aurora 3000 turbo (small turbo) and Aurora 6000 (Big Turbo) This kit supports 800HP. Power levels go up when larger injectors are installed and an ATS twin fueler is installed.

Stage 2. Replace the factory VGT with an Aurora 4000 turbo (small turbo) and Aurora 6500 (Big Turbo) This kit supports 900HP with stock injectors. Power levels go up when larger injectors are installed and an ATS twin fueler is installed.

Plus Kit - Street/Tow Uses the factory Turbo and add the second Aurora 5000 to it. This kit supports 650HP with stock injectors.
    Compound Kit
Stage1 Tow Kit. Replace the factory turbo with an Aurora 3000 turbo (small turbo) and add the second Aurora 6000 (Big Turbo) This kit supports 800HP. Power levels go up when larger injectors are installed and an ATS twin fueler is installed.

Stage 2 Race Kit. Replace the factory turbo with an Aurora 4000 turbo (small turbo) and Aurora 6500 (Big Turbo) This kit supports 900HP, Power levels go up when larger injectors are installed and an ATS twin fueler is installed.

Stage 3 Race Kit. Replace the factory turbo with an Aurora 4000 turbo (small turbo) and Aurora 7500 (Big Turbo) This kit supports 1000HP, Power levels go up when larger injectors are installed and an ATS twin fueler is installed.

    Plus Kit - Street/Tow
Uses the factory VGT (Variable Geometry Turbo) and add the second Aurora 6000 to it. This kit supports 650HP with stock injectors and all emissions on.
    Compound Kit
Stage1 -Street/Tow. Replace the factory VGT with an Aurora 3000 turbo (small turbo) and Aurora 6000 (Big Turbo) This kit supports 800HP. Power levels go up when larger injectors are installed and an ATS twin fueler is installed.

Stage 2. - Race Kit. Replace the factory VGT with an Aurora 4000 turbo (small turbo) and Aurora 6500 (Big Turbo) This kit supports 900HP with stock injectors. Power levels go up when larger injectors are installed and an ATS twin fueler is installed.

GM Duramax 2010 to 2017 6.6L
    Plus Kit - Street/Tow
Uses the factory VGT (Variable Geometry Turbo) and add the second Aurora 6000 to it. This kit supports 650HP with stock injectors and all emissions on. ATS Twin fueler is recommended to ensure the factory CP4 is not stressed.
  About ATS

Serving truck enthusiasts for nearly two decades, ATS invents, designs, manufactures, and sells the world's most innovative diesel truck performance products - over 600 products for one-stop shopping. Whether you need power and efficiency for towing, off-road, recreation, or racing, ATS Diesel Performance can meet your needs, quickly and at a reasonable cost.

ATS has products for GM Duramax, Dodge Cummins, and Ford Powerstroke diesel trucks, as well as Jeep and Dodge HEMI.

  Contact Us
  ATS Diesel Performance

5293 Ward Road
Arvada, CO 80002

+1 (800) 949-6002
info@atsdiesel.com
Business Hours : 7:30a - 5:30p



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