Rb25 Forward Facing Throttle Bodie

[ydr030]

wanting to move throttle bodie to front of inlet manifold... seen a few pics with cars that have it and wondering wats involved. ne 1 done this ?? thoughts ??

cheers.

[VB-]

cut it off at the original position and weld in a bit of flat plate to make it flat the whole way down the side, cut a big hole in the 'front' of the plenum, maybe add a small section of pipe, weld it on again

[Medium Dave]

I have read that this can upset thew flow of air into the engine, the factory manifold is designed to flow air from the side and evenly into the cylinders, when you put the throttle body on the front it will allow too much air into the front cylinders and too little in the rear, so you run rich one end and lean the other... so baisically, do some reaserch before starting

[Travo]

I have actually purchased a factory plenum with this mod and fitted it to my car - there is no change in performance (good or bad) that I have noticed if running most stock items. It makes the engine bay look so much cleaner and installing a FMIC means you dont have to cut your fan down either..

good fun sorting out the accelerator cable though

[linedup33]

were did u get u get that factory front facing plenum from? n ne pics?

[Travo]

  linedup33 said:

were did u get u get that factory front facing plenum from? n ne pics?

I mean it is the factory style plenum, however someone has already done what VB- said above and gave it the chop and move treatment. I can post a pic when I get home if still want to see..

[ydr030]

thanx 4 help,

i got to be careful here cos in other forums i have come across the other way, so dont take ofence ! vb that was d plan just not sure wat u do bout the coolant lines running thro throttle bodie ? do u just blok off ?

and travo no better throttle response ? thats really the only reason i want to do it.

[Travo]

  ydr030 said:

thanx 4 help,

i got to be careful here cos in other forums i have come across the other way, so dont take ofence ! vb that was d plan just not sure wat u do bout the coolant lines running thro throttle bodie ? do u just blok off ?

and travo no better throttle response ? thats really the only reason i want to do it.

Actually yes - throttle response, very good increase from about 60km+ (thats best place i noticed it and the reason i did it... god how i forget that?)

Coolant line is not needed if you move the TB up the front of the plenum. just disconnect and join the coolant lines together. I'll throw a pick up of mine shortly.

[StageaJay]

Theres a company in the uk that do this conversion, most people i`ve spoken to have said you get better gains that a greddy style plenum, mainly in bottom end torque i think. I can`t find the pictures on there website, but if you google image search thor plenum rb25 there`s a few pics

here http://images.google.co.uk/images?ndsp=18&...tart=0&sa=N

hope this helps

[cruzin33]

old pics of my plenum, im changing it soon to a Plazmaman item because no one in Adelaide could flow test the cut/shut item for me

[AntsRB25]

I modded my plenum to front facing and have had no probs at all. My engine makes 280 rwkw with no hassles at all.

[joeyjoejoejuniorshabadoo]

could you make a twin throttle body 3 & 3 cylinder job? is there room?

[75coupe]

um, I've seen a few stock plenums converted into front facing, but that one is amazing... perfect job...

so when are you getting a new plenum...?

so what are you doing with this one? *hint, hint*

cause that one really looks good...

[Venom_VL]

Heres 3 pleniums ive made all have worked very well first one was with the standard tb and the other two i used XE falcoon tb's, my car is making 287rwkw on 13psi on stock rb25 turbo bottom end with 9.5 comp, with the plenium in the last two pics, also using the XE/XF tb you can remove the standard idle air control and use the air bypass in the throttle body, i will be making more of the pleniums in the first two pics for mates as they work well and cut out about 1.5 m of cooler piping

http://tinypic.com/view.php?pic=2q8d9js&s=3

http://tinypic.com/view.php?pic=33crg4p&s=3

http://tinypic.com/view.php?pic=29gmt14&s=3

http://tinypic.com/view.php?pic=vdlaon&s=3

[1400r]

I saw JMS have a greddy plenum secondhand in stock with q45 tb already fitted up

[Venom_VL]

Hey Mikka33

All you have to do is remove the standard idle air control, just disconnect the wiring, plate up the holes and your ready to rock and roll, dont wory about the wiring you unplug, it doesnt have anything to do with the ecu

  mikka33 said:

Hey Venom, can you elaborate on the sentence above?

Currenlty have the FORWARD FACING set up with standard throttle body but looking to change to xe/xf

Cheers..

[cruzin33]

with the xf throttle body dont you need the rb30 tps??

[linedup33]

wen u guys change to the front facing stock plenum..were n how do u fit the stock bov?

[r33cruiser]

weld it onto the intake pipe coming from the outlet from the fmic to the throttle body..

*note this was on a fmic, with the typical setup with the pipe coming through the driver side guard to the plenum. this allows the bov to be hidden from plain sight.

[Venom_VL]

No you need to use a tb with a bleed screw idle control, like an XE/Xf tb other wise it will not idle correctly