Bluetop Bigport or Redtop Smallport?

[gordon77]

the blue tops have a bit more 'pep' down low in the rev range due to tvis (which restricts it a little in the higher revs) where the small port doesnt have as much down low but when they get past 4-5k itl go like stink

bullshit

shit thats an awesome comment...

i have driven both small port (extensivly) and blue top big port fxgt's and thats what i have noticed

[AE85coupe]

thats odd... cause the big thing i noticed between my smallport and bluetops i've driven, is the smallport has more torque down low

and... if i remember rightly t-vis does its thing up in the revs anyway?

you sure you don't have them mixed up?

[no_8wire]

tvis closes half of the air ways low down...eg air travels faster through 4 runners...at 4.5rpm the 4 butterflies open, to allow more air to flow...

[docTRD]

yea ive driven all types of 16v 4age engines id have to say smallport is my fav. (also because i stil have one hehe) but yea most bigport seem to only have most tug in the high rpm whilst the smallport has a smoother torque all the way up. i have made this even more so with a lightened flywheel. def the best choice !