Jump to content
SAU Community

Rb25 Forward Facing Throttle Bodie


ydr030
 Share

Recommended Posts

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

Link to comment
Share on other sites

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 :D

Link to comment
Share on other sites

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 :down:

Link to comment
Share on other sites

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..

Link to comment
Share on other sites

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.

Link to comment
Share on other sites

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.

Link to comment
Share on other sites

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

Link to comment
Share on other sites

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...

Link to comment
Share on other sites

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

Link to comment
Share on other sites

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

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..

Link to comment
Share on other sites

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.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share



  • Similar Content

  • Latest Posts

    • Welcome.  Glad to hear that you have gained some knowledge that has helped you. I believe the only fix for the power steer belt is an electric conversion with a Holden astra pump. If you get a chance, post pics of your car, please. 🙂
    • Just ordered those bosses, hopefully that does the trick thank you very much everyone for your replies it's really appreciated  
    • to have this type of adjustment possible with a curve as I wish, what budget (engine) should be planned?  
    • People still have Skylines? I thought they're non-existent now. 
    • Harness update time have had great fun and learnt so much already so far with this project. I started off making both the ignition and injector sub harnesses in the hope any mistakes i made here aren't as hard to undo and learn from as the main harness.  A cool comparison of the old harness using presumably TXL wire and the new which is using Tezel. Also opted to use DTM plugs to keep the whole setup as neat and tidy as possible and tucked the wiring under the coil bracket to try and keep it all from sticking out too much. Although the injector harness, I'm not overly happy with as I'm still using the rubber boots that are supplied with the type of plugs it just looks ugly and sticks out like a sore thumb with the white identifiers so a slight redesign may be done.   Then it was main harness time and most importantly trying to route it nice and away from the heat it will use the OEM heater hose routing which is no longer present to keep the harness up high and secure. it's amazing how much smaller this harness is able to be compared to the old one. plugged everything into the emtron and with the help of the tuner again attempted to start it up and instantly fired up and running smoothly on all 6 which was a big shock to myself. So still some routing and adjusting to be done for the final fit up and installing a knock sensor harness plug which is in the post all has gone surprisingly well.     The old harness for shits and giggles.
×
×
  • Create New...