ITB's are the ultimate if tuned correctly (I dont mean ECU tuned, I mean engine tuned)
ITB's can set your car backwards if done incorrectly which is EASY to do, some just give a small gain, some give massive improvements in torque, which is what you want.
Mechanical tuning is often associated with a must from ITB's due to their response they offer under sudden throttle position changes.
Pros:
Improved throttle response
Much more midrange/high end torque
Intake noise
Cons:
Increased fuel consumption
Hard to tune
Can be sensitive on minimal throttle
I have obviously missed a few pros and cons as I cant think of it all right now.
In my honest opinion, There is no point in going ITB's without the addition of camshafts to offer the extended duration and lift the ITB's work best off. N/A tuning is all about matching the right combination. Many people buy big compression pistons, big cams, big intakes and exhausts and what not, just a shopping trolley full of aftermarket goodies. These are meant to be made to work in conjunction with each other.
The ITB's are to be designed LAST of the engine. They are based around the camshaft specification, which is further dependant upon compression ratio, valve sizing/timing and a myriad of others.
I can go on forever but im getting off-topic.
Originally Posted by Chr1s
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