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I had the chance to test the new throttle body. I didn't test it thoroughly, because there was traffic and then it started raining. However, I managed to make a few pulls up to 4-5k RPM with partial throttle and one with full throttle. The car has definitely more torque and the engine runs much smoother. I was a bit puzzled how this can happen with just a small size difference, so when I arrived home I studied the stock part.
It looks that the stock tb has some design issues like that the inside surface is quite rough and overall the tapered shape is not very smooth. It is like they glued two different pieces together, but without fitting them exactly. I am not sure if this was made on purpose or just for keeping the cost low. However, these differences together with the size increase (+2mm) of the new tb, gave an impressive result.
Additionally, I didn't see any disadvantages like higher idle RPMs etc. I heard at the beginning there were such kind of issues, but it looks that Toda managed to solve them because this is a revised part (16400-FA2-002 instead of the older 16400-FA2-001).
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