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Curious George
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Discussion Starter #1
Some had experience with oversized TB on FI ?

I got 56 mm, and another one of 60... Does it sound good to get actual y8 intake out of engine bay, match it with TB, so for the gain ?


thanx
 
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The only reason you would want to on a FI car would be if that is the primary restriction before the head. Generally you want to keep you boost loss under 10% of the total pressure you are running, so if you have 20psi you don't want to lose more than 2 psi from the compressor cover to the intake plenum. To find out where your restrictions are just use your normal (plenum) boost gauge and then place one before the suspected restriction, in your case a throttle body. this 10% includes the entire system from compressor to head so while the TB may only loose 5%. the total loss should be kept under 10%.

go measure it and tell us :)
 

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Curious George
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3,569 Posts
Discussion Starter #4
Very good, but so what about 60mm tb instead 56 ? I want to know how much I can gain or not at wheel and if It can resulter greater trottle response or not ?!



thanx
 
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