Intake Mods

[unarmed_skyline]

Just wondering upgrading your throttle body to a bigger item, say a 90mm how much power does gain

would it give you, is it hard to modify a Q45 throttle body to fit an n/a r33??

[BADR33]

an xf falcon throttle body is a common mod. its a 65 or a 68mm. not really sure what you have to do to make it fit. but i would be interested as thats somthing im considering doing on my rb30... unless i got hex throttle

i heard that if you put somthing like that 90mm one you would lose heaps of low down torque. i know it can fit but its best for turbo cars

[someonestolecc]

I thought for a NA there'd be no point upgrading the afm?

[342Four]

not the afm, the throttle

they are diff

the throttle is against the intake plenum, the afm is near the airbox

upgrading both to a bigger internal diameter item will allow a greater flow of air with less restriction and so equal more power

so for a n/a r33 you could try the xf throttle (as the q45 is too large for non turbo plus modyfiying the intake plenum would be a down right pain in the ass - as u have to port the throttle intake on the plenum) and maybe a z32 afm

this should help a bit - maybe a 2-3% gain in power - with most power gained in the lower rev range

Edited February 27, 2006 by usherly

[342Four]

an xf falcon throttle body is a common mod. its a 65 or a 68mm. not really sure what you have to do to make it fit. but i would be interested as thats somthing im considering doing on my rb30... unless i got hex throttle

i heard that if you put somthing like that 90mm one you would lose heaps of low down torque. i know it can fit but its best for turbo cars

to put a larger throttle on, u have to port the throttle intake on the throttle and some other stuff

Click Here for Info

this is from the r31 skyline club website

[BADR33]

thanks for the link. iv been searching for somthing like that for ages.

its quite a bit more work then i first though. but will be well worth it in the end.

[unarmed_skyline]

G, that helped heaps, looks like a worth while mod for me to do whilst i have no licence, might be a little bit different for my rb25 but thankz for the hint of using the xf throttle body, ill post up a tutorial on how i go when i've got mine all done prob wont be for a few months thou,

[SKY031]

No idea about the RB25, but for those considering doing the mod to an RB30, the KA24 tb fits onto the RB30 with a lot less screwing around than the XF one.

I've got one waiting to go on....

plenum is nicely port matched, but i doubt it will make any difference to power at all.

The guts of it.....

[unarmed_skyline]

what size is the ka24?? y do you think it wouldnt do much for preformance?? Your effectively increacing the amount of air that can into the plenum, the more air the better,

[SKY031]

It's around 54mm

I really don't expect to see any noticable power difference.

Proof is in the pudding though...

It probably won't be going on the car any time soon, I want to get the rest of the engine bay sorted out and cleaned up before the shiny bits go on.

If it makes any difference to power, I'll report back.