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Morning Chums,

Just thinking here...the 48mm tb is restrictive on the 105, the 52mm tb sees a slight gain, the 56mm tb sees a loss, and direct to head throttle bodies sees a pretty decent gain...so whats the rhyme and reason to it all?

I can understand the 48mm not allowing a great deal of air into the manifold, and the 52 letting more air in, and the 56mm letting more air in but slowing it right down. So why doesnt the direct to head TB's have a bad effect on the engine? Is it the fact that each individual throttle body has a smaller diameter keeping air flow fast, and having four of these means, more air and faster?
 

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Is Constantly Horny
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5,063 Posts
the 48mm does not restrict air flow just lets the same amoutn of air in only slower
the 52mm gets the same amount as air in as the 48mm but for less throttle movment some even say that the 52mm can loose you torque

the 56mm is overkill it looses you power due to it takening in to much air at one point

throttle bodies work because there is less space for the air to travel and tbs are used with cams times to perfection an aftermarket ecu and ported heads, and many other mods
 

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Individual throttle bodies allow cylinder specific adjustment, which means you get the correct air per individual cylinder than you would for a manifold.

The 52mm Tb doesn't really do much on a 1.4..
 
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