xf tb, which size?

[hosedogg]

hey guys, just wondering which one of the xf tb's would be better suited to a n/a vl ? the 68mm or the 80mm?
cheers for any info.

[warney]

urs will prolly be a 60mm or there abouts throttle body any ways i wouldnt bohter to change it

[Stewart1000]

i didnt even knwo there was an 80mm on the XF's
the 80mm would be better but if you already have the 68mm on it yeah probably not worth making it even bigger because you wont notice much increase in anythign because the inlet manifold isnt big enough for the 68mm let alone the 80mm

[hosedogg]

i've only got the standard vl tb and i've been told that this one i should be getting pretty soon is an 80mm. when i put it on i'll be replacing the whole intake to suit, so it gets a nic even flow. cheers.

[bangers]

how are you oing to replace the whole intake? the opening on the plenum isn't big enough for 80mm to be of any benefit. the air flow is only good if the plenum can get it in.

[hosedogg]

by the intake i meant the intake piping not plenum, forget to wrinte piping. the plenum u just get a die grinder and take it out to the same size as the tb. i've read articles on how to do it. i was just wanting to know which would be the better size to use. i'm thinking the 80mm would be the better size.

[bangers]

the plenum won't have enough meat on it to grind out that far.

[hosedogg]

well i myself am not 100% sure as i have not checked. i am just going by what i read on this site here... http://wiki.r31skylineclub.com/index..._Throttle_body

[gungazza]

wy bother

[hosedogg]

only bothering because i can get the 80mm throttle body for free of one of my mates.

[atrail308]

its only gonna pay off if you were force inducting, the standard size will give you next to no power increase...

[Stewart1000]

i doubt the OD of the plennum inlet is even 80mm, you wanna get a caliper onto it and check it out, also you will need different bolts to attach the throttle body.
and because the xf tb's are a lot longer you have to shorten the accelerator cable, dont do what the wankers do, use a long bolt and spacers on the throttle cable bracket, just mount it like normal and pull more cable through down at your pedal, its actually easier and then your motor doesnt look stupid.

just doign over it in my mind 80mm would be covering the bolt holes in the plennum chamber.
check your measurements first before you go modifying things because i have read the hot-to's and guides and i did it all myself without help from any of the guides cos they all had the wrong info or really dodgy ways of doing things. It sounds easy but its actually quite hard to fit the 68mm xf tb onto the rb30 manifold, very tedious. It took me the best part of a day