: Throttle body spacer

07-04-10, 02:50 PM
What is a throttle body spacer supposed to do?

07-04-10, 04:41 PM
A throttle body spacer is a small block of aluminum or other material that is bolted on top of a vehicle's throttle body, that has a port or multiple ports in the center of it. Most spacers these days also have either a helical cut along the walls of the port(s) or serrated edges, which help the air/fuel mixture to become more turbulent. In theory this turbulence causes the air and fuel to more thoroughly 'mix', and is suppose to result in a more complete combustion inside of the engine cylinders, less wasted fuel, and a moderate gain in horsepower.

With that, there are 2 kinds.

1. Phenolic which in theory lowers the temp on the incoming air because it separates the TB from the rest of the metal in the engine and as the name states is made of a Phenolic material. These typically do not have the channels cut into or raised in the walls. They are more for temperature reduction and help keep the charge cooler as it enters the engine.

2. Most TB spacers are metal and have a channel to "twist" the air to create a more dense charge as explained above. This is similar to what the Tornado is suppose to do.

I don't think we have room for either, besides a Performance TB Spacer is not recommended in forced induction engines.

07-05-10, 08:03 PM
Did you guys see the gains the V2 CTS-Vs are getting by changing to an LS7 throttle body? Any chance we can see gains from a larger TB?