This extra pressure helps cram more air-fuel mix into the cylinder — effectively acting like a turbocharger. The problem with this technique is that it only provides a benefit in a fairly narrow speed range. The pressure wave travels at the speed of sound which depends on the density of the air down the intake runner.
The speed will vary a little bit depending on the temperature of the air and the speed it is moving, but it only works up to a certain point — and it would be silly for your car to have a foot-long intake manifold. Based on very careful mathematic calculations, engineers determine how much they should lengthen the intake and what that will do to yield the greatest benefit over the greatest RPM range.
What is a Throttle Body Spacer? The throttle body spacer installs in place of the throttle body gasket. These gains are a direct result of changing the length of the intake manifold. Throttle body spacers aren't quite the "fuel tank magnets" of the 21st century, but they're at least halfway there. While there is some solid science behind using them in some applications, most TB spacer manufacturers choose to gloss over the hard facts in favor of more eye-catching and easily digestible marketing gimmicks.
The TB spacer isn't necessarily a bad investment, but do your homework before laying down the cash for one. The manufacturing claims behind the throttle body spacer usually follow this form: "Improves fuel economy, horsepower, torque and unicorn emissions by" alternately "inducing a swirl in your air charge" or "straightening it out. The idea is that swirling the air imparts more energy to it, causing it to tumble and better atomize the fuel. Laminar-flow proponents claim that smoother airflow through the throttle body enhances net flow.
We'll see. Air flowing into an engine doesn't just flow straight through in one big mass. When air flows along a surface, some of the air "sticks" to the surface, forming a very slow-moving boundary layer that acts as a sort of "lubricant" for air flowing over it. When air goes through your throttle body, a boundary layer of stagnant air forms on the inside of the throttle body bore and on the front of the throttle blade. Air flowing over this boundary layer goes into the intake manifold, where it sits in a central chamber -- the plenum -- waiting to be sucked into one of the intake runners.
Here's a bold statement, backed up by about four centuries worth of physics: Any manufacturer that claims its spacer induces a helpful straightening or swirling of the air is -- wait for it -- lying. The boundary layer that builds up on the throttle body walls is thick enough to cover those machined swirls in the spacer bores. This is true even of spacers that use very thick, helical grooves, because the boundary layer will simply fill them like cement and the air will skip over them.
As for the TB spacer OblivioAssebit Proven Member. I know Jeeps say they gain power from TB spacers. I have a G35 also and the plenium spacer on that added a good 15hp. I could honestly see maybe a 10hp add with an intake spacer. OblivioAssebit said:. Dude, I wouldn't waste your money on a TB spacer, it does nothing for our cars.
I actually bought a bigger TB with a 57mm bore. I love it, not only do I feel a difference in power but it sounds awesome too. Almost like the spool of a turbo, and its loud enough for people to hear outside too. There are few modifications that seem "worth" their price given the performance gain if any. Intake manifold spacers, however, can significantly cool the intake charge.
It's not necessarily true that the manifold reaches the same peak temperature with a spacer as without. There have been numerous test performed using dynamometers to confirm this assertion. Lol have you ever owned a turbo car?
I've herd that TB spacers can actually give a little whistle, i'd imagine that is what he is referring to. Very different things. Yes, the plenum spacer DID help a g35 I was working on for a friend. I felt a difference, barely. TB spacer? You must log in or register to reply here.
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