A given throttle angle movement on a bigger TB is going to move alot more air then the smaller one. What you will end up with is a touchier throttle/less resolution in the pedal when its almost closed.
Ideally you want a throttle just little big bigger than the volumetric flow rate of the motor. And i mean that fits JUST the motor. Not boosted mass flow rates converted to CFM (a volume)
If your motor uses a 70-75mm N/A, use the same size one boosted, i dont see how going to a huge throttle is going to really help all that much.
Also to point out, if your needing a special coupler to connect the smaller pipe, to the larger throttle. The way i see it, your already/still going to adapt a smaller cross section to a larger one, so it doesnt really matter if its the thottle itself being the change point or the silcone coupler. So makes more sense to me to have the smaller throttle that better matches the motor and pipe and have better low throttle response rather than just use the huge throttle just because its big and not going to really do anything.
91 GT 302 CID c4 w/brake
TFS TW heads, f-cam, typhoon
70mm masterpower single turbo setup.
Last edited by foxfan88; 05-03-2011 at 09:43 PM.