Quote Originally Posted by VT3C View Post
Hrm I was thining of doing a similar mod to this but I personally wouldnt touch the butterfly valve nor the screws etc. The gap shown in the DIY photos illustrates the potential leaks. PErsonally this would not beacceptable and I would not want to 'tune this out' with the IACV etc.

If you stomp on your throttle and your cable is a litle tight you might just snap the axle/rod that holds the butterfly plate so i definately wouldnt take it down that much.. you REALLY dont want to snap your butterfly plate (or the rod/axle) on the track or EVEN WORSE on the street.. imagine permanent WOT in daily traffic ???!!!

If you look at the science of this (and what spoon has done also) you see that it is increasing the potential air velocity (speed) but it wont actually increase the flow as there is no increase to the diameter of the actual 'valve' itself. I guess the faster moving air would increase the pressure and therefore squeeze more air through the TB.. Those changes to the Butterfly plate and rod/axle (and screws) could also create some turbulence (possibly) however I think the reduced restriction by doing this wouldnt be worth the sacrifice in reliability/durability etc.

The spoon TB's actually have the centre re-bored and a replacement butterfly plate with larger diameter to suit. doing this increases the velocity AND the flow and hence can give you a snappier response and power gain.
Are U saying this mod won't work?