hi, i believe the b16a & b16b hve the same diameter [60mm]; i had the spoon 70mm t/b and replaced it for the itr [62mm]...
this mod is especially required when you hve internal mods. tho stock you will notice little diff in power gains
however note i hve an ek4 not a '9'
Isnt the EK9 SPOON TB 70mm before the butterfly and 60mm after the butterfly? 62mm is for ITR?
If this is the case then just a simple and cheap bore to your stock TB is all you need rather than spending $600+. I remember RVM bored his TB.
Ok thanks, So I should just get an ITR throttle body and bore the front of it out to 70mm and leave the back of it standard right? Are 96 & 98 spec itr throttle bodies the same?
They are the same size. You can reproduce the venturi/spoon effect by doing exactly what they do.
It's a modification small shops have virtually perfected long ago from where I'm from and if I recall, charged $75.00cad back as early as 1998.
your wasting your time with a 70mm tb anto,a stock itr one will be a good upgrade for b16b
anything over that is pointless unless you have more aggressive cams
x2!
this is wot i opted for, as the 70mm t/b is best for internal mods
You meant 70>60mm TB right? A 70mm TB is way too big for a B16. 70>60 venturi is ideal for you