Stay Away From Throttle Body Spacers
The engine of the tundra is much like a large air pump. The more air circulating in the motor, the more fuel is mixed and combusted to produce more horsepower. There are a good number of ways to help the engine “breathe” and reach its maximum potential. Most truck owners do this by installing air filters or cold air intakes, and the bolder ones even use superchargers to get the most airflow just to get that extra edge of more horsepower.
There are some products out there that claim to be able to improve on the already significant engineering that has gone into your motor. Some of these products, like performance air filters and cold air intakes, work as advertised. These accessories improve performance because they trade an increase in performance for an increase in something else. In the case of air flow, it’s usually a trade between increased engine noise and an increase in power (not to mention expense).
Unfortunately, these simple enhancements sometimes state exaggerated increases in horsepower and fuel mileage. We have tested a few of these cold air intakes and, so far, none of them has matched the results that they claim on the packaging. With that said, none of them were disappointing. There is a product that I have hard time endorsing and this is the throttle body spacer.
Throttle body spacers like the PowerAid by Airaid are designed to be placed between the truck’s throttle body and its intake. This brand has claimed that it creates an intense vortex of air that will help to better atomize the fuel when the two becomes mixed. According to its manufacturers, the so-called vortex is accomplished using a series of grooves that is carved inside the device itself.
This device is quite flawed. Simply put, the idea of a ‘vortex’ is a good one, but if it were that easy, then this would probably be already installed in the factory in the first place. After all, automakers are competitive, so they naturally think of everything. Indeed, to add considerable horsepower or fuel mileage gains, fuel and air are simply not mixed together in the cylinder until before combustion.
In primitive forms of fuel injection (such as throttle body injection), where fuel was sprayed directly at the throttle body and then mixed with the air immediately before being routed to the cylinders, then perhaps a spacer would be of some benefit. Spacers can also help generate power on carburetted engines. However, the technology used in the Tundra?s multi-point fuel injection system precludes any useful effect from such a device. The chances that the air would still be feeling the effects of a vortex by the time it got through the intake to the cylinder are very low.
Bottom Line: I do not endorse the use of a throttle body spacer on any modern fuel injected engine. Save your money and put it towards something else. A K&N performance air filter, for instance, costs half as much and it will definitely improve your engine’s performance and fuel economy.
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