Are throttle body spacers worth it...?
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Originally Posted by bigtruck311
throttle body spacers hurt your performance by slowing down the intake air volocity among other things they will do nothing to help on modern fuel injected engines
" There is power improvement of 4 - 5 hp to be found with a spacer, likely as a byproduct of increasing the plenum size, which is too small to be ideal."
So, there may be an insignificant gain of a couple of hp.
If it were me, I wouldn't put one on for that small gain on an otherwise unmodded engine.
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one of the little swirly spacers will do nothing on a port injected engine.swirling the air 1/2 a mile before you get to the fuel will have no effect on attomization as they claim.and the tornado demonstration with the 2 2-liter bottles of water is b.s. water doesn't flow the same as air.they will only cause a restriction ( if they are smaller than your t/b ) and cause turbulence,further restricting airflow.the only way a spacer would do any good is if it is a smooth bore the same diameter as your intake.and even then its gonna be marginal (4 or 5 hp )
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Originally Posted by way fast witey
one of the little swirly spacers will do nothing on a port injected engine.swirling the air 1/2 a mile before you get to the fuel will have no effect on attomization as they claim.and the tornado demonstration with the 2 2-liter bottles of water is b.s. water doesn't flow the same as air.they will only cause a restriction ( if they are smaller than your t/b ) and cause turbulence,further restricting airflow.the only way a spacer would do any good is if it is a smooth bore the same diameter as your intake.and even then its gonna be marginal (4 or 5 hp )
The reason why they work is that they increase the volume of the intake manifold cavity before the throttle body. This helps improve bottom and mid-range power. Again, this is up to a point.
I actually installed a set of Hedman hedders and one of their throttle body spacers on my 2005 Chevy 5.3L truck. The spacer is a smooth bore design and looks descent as well. I'll never repeat the actual dyno numbers, but the spacer made more then the "hedders"! Let's also just say that "hedders" gave between 4hp and 6hp to the ground...
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HI!... I can't remember the exact #'s but I installed a POWERAID TB spacer on my truck years ago and had it dyno tested. I lost TQ and H.P with it and got about 2MPG worst gas milage with it on. Plus the WHISTLING noise at part throttle is very unwanted. I ended up boring the HELIX out of it to match my BBK 75MM TB and then drilled it for my nitrous set-up, converting it to a nitrous plate system. All spacers all usesless.