Turbo Air Guide (TAG) Technology

The Turbo Air Guide (TAG) is a new device invented by Diesel Power Products, which when used in the intake of a turbo charger can help to get more air smoothly in to the compressor. The TAG straightens air flow into a laminar flow and directs it straight into the compressor of the turbo, resulting in more power, cleaner burning and better mileage. The TAG shown in the picture above is installed in the intake of a Garrett turbo charger used on Ford Powerstrokes and is constructed of stainless steel welded honeycomb material and will eventually be made to fit many applications for most turbo charged engines, gas or diesel.

To understand how the TAG works and what it does we need to look at the compressor wheel inside the turbo charger and image what it is doing. In the picture air coming from the vehicle filter would enter the compressor wheel fins from the top of the picture traveling down and being accelerated and compressed as the wheel rotates. This air generally travels into the fins of the compressor wheel at an angle in the same direction as the rotation of the wheel, but is also turbulent from passing through the air filter and associated piping before reaching the compressor wheel. As the wheel rotates to move the incoming air, the leading edge of the fins encounter the turbulent rotating air moving in the same direction the wheel is turning. This rotational motion of the incoming air limits the amount of air the fins can grab and the turbulence creates drag on the fins as they cut through the incoming air. The Turbo Air Guide when placed directly in front of the compressor wheel acts to change the incoming air into a smooth laminar flow and directs the flow directly into the fins allowing for more air to be introduced into the compressor wheel smoothly, while reducing drag caused by turbulence.

The drawing above illustrates turbulent, rotating air entering the compressor wheel of the turbo charger. The wheel is rotating the same direction as the arrows indicate so the blades of the wheel are trying to pull in and accelerate air which is traveling in the same direction as the wheel.

The picture above illustrates air straightened by the TAG entering the compressor wheel. This allowsmore air to enter the blades of the compressor wheel in a smooth fashion greatly reducing drag and noise on the compressor wheel.

This flow chart shows an increase of 9% using a TAG-III in a Dodge Cummins. The increased air flow provides up to a 45% reduction in visible smoke, quicker turbo spool up, increased pulling power for towing, lower exhaust gas temperatures and can increase fuel mileage. These results will vary depending on the modification level of the truck, driving habits, load and environmental factors.

In the Dyno chart above, the dark lines are with the Turbo Air Guide installed and the reddish lines are without the TAG installed. The test vehicle is a 2001 Ford F250, crew cab, long box 4x4, 7.3L Powerstroke, automatic transmission, 4" exhaust with Aeroturbine, aFe air intake and Banks Big Hoss level-5 chip. The area between the dark lines and the reddish colored lines represents the improvement using the TAG. Besides the dynometer results, the truck seems to run quieter, have quicker throttle response, less smoke and better mileage.