AFE Throttle Body Spacers

dlbrooks18 · 05-19-2009, 04:06 PM

Any reviews? Did a search, no luck.

http://afepower.com/shop/details_new...02&&brandID=26

possible335i2008 · 05-19-2009, 04:25 PM

interesting but probably not worth it..i have seen spacers but there purpose was to cool the air comming in from the intake..i have no idea about the "turbulence" claim and its worth

1clean335i · 05-19-2009, 04:29 PM

Most of the cars i've seen use throttle body/intake manifold spacers, are n/a cars. I cant say ive seen many forced inducted cars use them...

dlbrooks18 · 05-19-2009, 05:07 PM

anyone purchased this yet?

ppatel223 · 05-19-2009, 09:14 PM

I have installed this similar type spacer on my v8 tundra, and i see no increase in MPG, just another BS like the tornado device

dlbrooks18 · 05-20-2009, 01:27 AM

so I guess this is a worthless mod

scheherazade · 05-20-2009, 12:23 PM

Larger plenum tends to help torque. (Or so I've heard)

What happens is that a piston will do an intake stroke, and draw air from the intake manifold.

This lowers the pressure in the manifold.

Towards the end of the intake stroke, the pressure in the manifold is lower than the beginning of the intake stroke, and so the piston has a harder time drawing in air as it gets later in the intake stroke.

Having a larger plenum will make the pressure drop between beginning of intake stroke, and end of intake stroke, a smaller difference. Basically, you get improved air intake flow.

After the intake stroke is done, the intake manifold air pressure has to rise again as the intake gasses diffuse into the intake manifold. (Be it under pressure (FI) or not, the gasses still have to flow back in). This causes shock waves which to some extent disrupt air flow.

Having a larger plenum means that there is more volume from which to draw intake gas. This larger volume acts like a buffer, causing a less dramatic drop in pressure every time there is an intake stroke. Less drama = weaker shock waves.

Truth is, it works. Although for mos of us it's not a big deal.

I'm sure if you were pushing massive hp, and pushing a ton of air and a bunch of rpm, this mod would be more significant...
Just like porting your valves is 'whatever' until you *need* them ported. Then it's a big difference.

-scheherazade

dlbrooks18 · 05-20-2009, 11:59 PM

^ thanks for the info

05-19-2009, 04:06 PM	#1
dlbrooks18 Brigadier General 164 Rep 3,735 Posts Drives: e90 335i Join Date: Nov 2008 Location: Los Angeles iTrader: (2)	AFE Throttle Body Spacers Any reviews? Did a search, no luck. http://afepower.com/shop/details_new...02&&brandID=26
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05-19-2009, 04:25 PM	#2
possible335i2008 Major 182 Rep 1,222 Posts Drives: 335i Join Date: Mar 2008 Location: united states iTrader: (10)	interesting but probably not worth it..i have seen spacers but there purpose was to cool the air comming in from the intake..i have no idea about the "turbulence" claim and its worth
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05-19-2009, 04:29 PM	#3
1clean335i Perf BMW mag issue 147, 159 432 Rep 6,799 Posts Drives: Project Estoril Join Date: Feb 2007 Location: Miami, FL iTrader: (31) Garage List 2013 335i M-sport [0.00] 2011 X5 xdrive35i M ... [0.00] 2009 335i M-sport [0.00] 07' 335i Sedan [0.00]	Most of the cars i've seen use throttle body/intake manifold spacers, are n/a cars. I cant say ive seen many forced inducted cars use them... __________________ '13 Estoril Blue 335i M-sport *Don't PM me!* Message me here- http://www.facebook.com/ProjectEstoril
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05-19-2009, 05:07 PM	#4
dlbrooks18 Brigadier General 164 Rep 3,735 Posts Drives: e90 335i Join Date: Nov 2008 Location: Los Angeles iTrader: (2)	anyone purchased this yet?
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05-19-2009, 09:14 PM	#5
ppatel223 Banned 32 Rep 372 Posts Drives: F10 I3.0 Join Date: Jan 2009 Location: AR iTrader: (0)	I have installed this similar type spacer on my v8 tundra, and i see no increase in MPG, just another BS like the tornado device
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05-20-2009, 01:27 AM	#6
dlbrooks18 Brigadier General 164 Rep 3,735 Posts Drives: e90 335i Join Date: Nov 2008 Location: Los Angeles iTrader: (2)	so I guess this is a worthless mod
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05-20-2009, 12:23 PM	#7
scheherazade Major 37 Rep 1,467 Posts Drives: 09 GTR (& 93' accord!) Join Date: Sep 2008 Location: DC metro area iTrader: (8)	Larger plenum tends to help torque. (Or so I've heard) What happens is that a piston will do an intake stroke, and draw air from the intake manifold. This lowers the pressure in the manifold. Towards the end of the intake stroke, the pressure in the manifold is lower than the beginning of the intake stroke, and so the piston has a harder time drawing in air as it gets later in the intake stroke. Having a larger plenum will make the pressure drop between beginning of intake stroke, and end of intake stroke, a smaller difference. Basically, you get improved air intake flow. After the intake stroke is done, the intake manifold air pressure has to rise again as the intake gasses diffuse into the intake manifold. (Be it under pressure (FI) or not, the gasses still have to flow back in). This causes shock waves which to some extent disrupt air flow. Having a larger plenum means that there is more volume from which to draw intake gas. This larger volume acts like a buffer, causing a less dramatic drop in pressure every time there is an intake stroke. Less drama = weaker shock waves. Truth is, it works. Although for mos of us it's not a big deal. I'm sure if you were pushing massive hp, and pushing a ton of air and a bunch of rpm, this mod would be more significant... Just like porting your valves is 'whatever' until you need them ported. Then it's a big difference. -scheherazade
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05-20-2009, 11:59 PM	#8
dlbrooks18 Brigadier General 164 Rep 3,735 Posts Drives: e90 335i Join Date: Nov 2008 Location: Los Angeles iTrader: (2)	^ thanks for the info
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