68mm GT throttle body - Club4G Forum : Mitsubishi Eclipse 4G Forums - 2006-2012 Eclipse Authority
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2006-2012 Eclipse (General 4G) General discussion and information about the 2006-2012 (4th Generation) Eclipse.


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Old March 24th, 2020, 06:32 PM   #1 (permalink)
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68mm GT throttle body

Im trying to find a 68mm GT throttle body for my 06 eclipse but i cant seem to find a 68mm. Ive found plenty of 70mm. If anyone has any where abouts of where i can get one it'd be greatly appreciated.
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Old March 24th, 2020, 06:38 PM   #2 (permalink)
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An evo X throttle body SHOULD work. Why do you need 68mm specifically?
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Old March 25th, 2020, 09:54 AM   #3 (permalink)
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My friend said anything bigger than that and i might have to bore my engine. But im not so sure about that which i why i asked on here.
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Old March 25th, 2020, 10:17 AM   #4 (permalink)
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Ah, you should stop taking advice from that friend.

You want to have your throttle body size and intake manifold size, including the plenum and the runners, set up for the amount of flow your engine will be taking. You want the air to be moving as fast as possible in order to get the highest volumetric efficiency, as that will allow more air to get crammed into the cylinder at once.

Runner lengths affect when the peak flow happens, plenum size has to be tuned to provide the air available(eg, if you bored out the motor, you'd need a larger plenum, if you revved higher, you'd need a larger plenum and throttle body), the throttle body lets that air in, or restricts air, depending on throttle level.

Unless you have a ported intake manifold, going larger than stock will not help, you'll just add turbulence and slow down the airflow. Bigger is not always better. Too big will result in poor jerky throttle control, and general loss of power.
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