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Old 08-27-2014, 02:22 PM   #1
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Throttle Body Spacers?

I know there are plenty o' threads about the possible benefits of the spacers and even a few positive installs (or at least perceived) and I have been on the fence about buying one (I know, I know, but my argument is if you add up a bunch little things it only seems logical that SOME improvement is to be had, even if only over stock).

Anyway, I just dropped in the BBK 73mm throttle body this afternoon (and no, there was no earth shattering reaction but keep my above point in mind, that with headers, air filters, coils, etc. there is power to be gained short of a tune which is my goal right now, and look at that size difference has to help??) and all performance issues aside, I noticed something that has me scratching my head.

If you look at the intake manifold tube BEHIND the throttle body, it has fins that I am guessing straighten the air out before it enters. I know the concept behind the spacers is to create the venturi effect (to swirl the air making it have some benefit) but my question is, if the space is BEFORE those fins (as I believe it is) wouldn't those fins cancel any effect the spacer-venturi has??

Almost seems as if Ford was one step ahead of aftermarket products in this one..

Guess I can't add photos yet, how about this:


Peace out 'ombres

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Old 08-27-2014, 02:31 PM   #2
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If you don't have a tune you're getting hardly any gains from any mods you put in.
Don't waste your money on a throttle body spacer.

"At least it isn't a Honda"
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Old 08-27-2014, 02:58 PM   #3
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Yeah, I was debating it until I saw those fins in the intake manifold. I have so many suspension upgrades lined up I think the spacer is officially off the list.

Again, not so much as trying to argue getting one rather more of do those fins negate any effect the venturi is creating?
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Old 08-27-2014, 03:10 PM   #4
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Somewhat. The venturi effect helps SLIGHTLY at very low end torque from the spacer. But it creates turbulence in the plenum in the upper end of the power band, choking it. So you end up losing more top end power than you gain down low.

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Old 08-30-2014, 09:18 PM   #5
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When the intake is ported they remove the fins anyways.

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