j200pruf

iTrader: (4)

Hey all for a street port motor what would you all consider the best TB size out of the following sizes:
3x45
3x50
4x48
4x54
The TB will go on a stock 6PI LIM with a custom UIM.

RX200013B

i was curious as to the 3x throttle body VS th 4x tb , would you get any problems the center tb sharing the 2 pri ports?

looking to do same project

rotarygod

iTrader: (1)

That's what it does from the factory.

j200pruf

iTrader: (4)

The 2 3x tbs are actually stock ones from and FC or FD.

j200pruf

iTrader: (4)

Also for setting up a plenum in an N/A application is it better to have it before or after the TB? I noticed a few engines that live at higher RPMs, older F1 engines (not sure on current) and sport bikes, have the plenum after the TB.

Black91n/a

No, the FD has 2x50mm and 1x45mm as far as I know. I've heard that the 20B has 3x50mm, but that might just be rumor.

RX200013B

i was imagining a itb set-up over the stock lower

j200pruf

iTrader: (4)

It would work the same way if you used 3 ITBs.

peejay

I'd do 4x48, or 2x48 and 2x54 (primary/secondary, don't need to be progressive) and throw away the stock intake manifold altogether.

RX200013B

would those size plate be a little too big?