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Message: <blockquote data-quote="J101" data-source="post: 1393240" data-attributes="member: 15660">Shirotenshi,somehow or rather i knew this sizing matter would definitely pop in one of the replies. haha. Speaking of sizing, those tiny milimetres do make a difference. I think last time i did mention that small mods do help in future mods, which is true. the best way to find out if your TB is too small for your intake manifold is to determine what is the intake manifold absolute pressure (map) sensor is reading (inside the intake manifold) when you are at full throttle or wide open throttle (wot) while the car is accelerating using a EMS datalogger. the map should be equal to, or close to, atmospheric pressure. if it isnt or almost there the (map) drop at WOT, then your TB is still too small. no no, dont use a vacuum meter.the rest like the length and diametre of the intake manifold which actually can be tuned for optimum performance in both low and high rpms. probably v8_nutter can tell you more about the intake part koz he has experiences in building intakes and did trial and errors formulating a good one. The flow rate between TBs and intake manifold is very important.</blockquote>

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