Jump to content
SAU Community

Recommended Posts

Did a search but came up with nothing, so has anyone made their stock 34Gtt plenum forward facing by blanking the original entry point and making a new throttle body mounting plate on the front? Would this actually work or be bad in regards to flow? would like to get rid of the excess pipework across the front of the engine, along then across the engine to the throttle body and the aftermarket FF plenums sound like a P.I.T.A gettting the AAC and everything else connected and working.

Fors and against please guys, and if anyone has done it pictures please.

Because the standard plenum was designed (by some very clever Nissan engineers) to have the air enter from the side and distribute it evenly to all 6 cylinders. That is not a trival exercise, given the shape that the plenum is. You can bet your last buck that there's some rather clever design ideas hiding inside there. It's not just a box.

Chop and change it the way you describe, and despite the people out there who have done it and therefore have a vested interest in defending the results (so they don't look stupid) or are actually ignorant of the results (poor air distribution), what you will inevitably do is wreck the distribution between cylinders. The box was designed to receive air from the side, now it's getting it jammed in from one end, and the box has NONE of the design features that you'd expect to see in an end-fed plenum.

Ok, that's sort of what i was thinking but wanted confirmation. So my only real choice is to fork out heaps of $$ for a FFp and new throttle body and the dramas that come with fitting one i am guessing.

  • Like 1

dunno what GTS kid just said but look at the GTR, those clever little engineers at Nissan designed the forward facing plenum and that didn't cause "uneven air distribution" as he described.

I agree don't chop it tho, leave it or get a good greddy copy instead

dunno what GTS kid just said but look at the GTR, those clever little engineers at Nissan designed the forward facing plenum and that didn't cause "uneven air distribution" as he described.

Seriously, are you just following GTS around trying to flame him? No relavance to GTR plenum, his comment was regarding forward facing the stock Gtt plenum.

dunno what GTS kid just said but look at the GTR, those clever little engineers at Nissan designed the forward facing plenum and that didn't cause "uneven air distribution" as he described.

I agree don't chop it tho, leave it or get a good greddy copy instead

This is the epitome of retarded. Yes, you are correct, Nissan did design a forward facing plenum and yes it does work. But he is quite obviously talking about the RB25 inlet plenum, as is everybody else because that is what the thread is about. He is talking about the uneven air distribution that is created when you convert a standard RB25 side feed (for lack of a better name) plenum to a forward facing one. He is not talking about a the RB26 plenum which was DESGINED to be forward facing.

Using your logic converting the RB26 plenum to side feed would not have any "uneven air distribution"

Anyway, to OP, yes you are better off leaving the standard inlet plenum as it is or puchasing a greddy/plazmaman etc one. As has been stated a standard converted plenum often leans out cylinder 6. Using a forward facing plenum you get power loss in the low/midrange.

Edited by iruvyouskyrine

Why not? You can run a cooler pipe Gibson style from the drivers side over the top of the cam covers.

Cheers Wolverine I will google/search Gibson style, is it similar to gangnam style? :P

Thanks for the input guys.

He is not talking about a the RB26 plenum was was DESGINED to be forward facing.

Um if u look at the RB26 plenum, the 1st 3 cylinders get the majority of the air according to GTS boys theory because its forward facing, but this isn't true. All the cylinders do get even airflow despite the forward intake being closest to the 1st 3 cylinders.

Anyway it was a silly idea by OP, i wouldn't mess around with plenums, get an aftermarket one if that's what u wish

Um if u look at the RB26 plenum, the 1st 3 cylinders get the majority of the air according to GTS boys theory because its forward facing, but this isn't true. All the cylinders do get even airflow despite the forward intake being closest to the 1st 3 cylinders.

Anyway it was a silly idea by OP, i wouldn't mess around with plenums, get an aftermarket one if that's what u wish

You are totally missing the point and comparing apples to oranges. It has even air distribution because it was DESIGNED, i repeat, DESIGNED to be forward facing, unlike a modified standard plenum that was DESIGNED to be side-feed and has been modified to be forward facing, hence having uneven air distribution. If you cannot understand this, then i truly feel sorry for you.

Sorry OP, as i said before your only real options are

- Standard plenum

- Std plenum with different crossover piping as shown by Wolverine

- Plazamama/Greddy forward facing plenum

If you already have a NIStune or aftermarket ECU, and are willing to give up traction and cruise control then you can use an RB25DET Series 2 Throttle body, and it will work fine with your car. The standard 25 Throttle body is exactly the same as the one in the post wolverine made, and will allow you to run that crossover piping no worries :)

Edited by iruvyouskyrine

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



  • Similar Content

  • Latest Posts

    • Ahh...should have been clearer ~ there's 2 ... SMJ = super multi junction (connector)...   ...this is connector 6 & 25 in above image -- body harness to engine loom (6) & body harness to main loom (25) Headlights go to front via connector 6 ; fuel gauge goes to tank sender via connector 25  ...like I say this is R33 diagrams, but at a pinch R34 won't be too far different. *IF* the two ground faults are related, this can be the only place where both wires converge (as one runs to the back, the other to the front)... ....thing is, you probably need to establish if the faults are related (unless you examine that area and find obvious chaffing on the looms there to body ground)....*IF* the fuel gauge is still broken (full needle deflection), I'd be headed for the boot, remove fuel sender wire, key on and measure the voltage there ~ it should be roughly 10volts. If that's ok, check sender to ground resistance...if this is a dead short to ground (and there's fuel in it), then sender has failed or something funky has happened to wiring in the tank. edit: ahh...rereading the thread, this is R32....above fuel sender test still valid tho'
    • I just changed the timing belt on my RB25DET NEO and wanted to get some opinions. I’ve been super cautious, did a lot of research, and took my time. I’ve driven the car, and it runs fine. After warming it up, I revved it to 8000 RPM a few times—no issues, everything held up.   After the drive, I heard a noise that I think is either the clutch or possibly a tight accessory belt. It’s not constant, just comes and goes.   I took the timing cover off to double-check everything:   Belt is on properly, Tensioner is tight, Did the 90-degree twist test—belt isn’t too tight or too loose.     What still worries me is that I noticed the belt seems to sit a little toward the front edge of the gears, especially on the idler pulley. It even looks like it’s slightly coming off the edge there. Is that normal?   My old belt (5 years old, ~3,000 miles) also showed a bit of wear on that same edge, so maybe it’s just how it sits? I’m probably overthinking this, but since it’s my first time doing this on a NEO and the engine is forged, I really don’t want to mess anything up.   Also, I’m thinking of swapping to a clear front timing cover with the glass window. Would you recommend NITO or HPI? HPI looks reputable and their covers have 2.5mm thickness, but not sure if there’s a real difference between the two.   Any advice or reassurance would be much appreciated!
    • 40 grit sounds about right, to start. You make some decent cuts/damage in the coating with that, then rapdily scale up to maybe 80 and 120 for the bulk of the actual removal, then fine it off to 180 or 240 perhaps. No need to go any finer than that, and maybe no need to go even as fine as that. Wrap it on a big block and have at it. At least on the hub face.
    • Do the GKTech rear lower control arm mount relocation, and either alloy subframe inserts or very stiff subframe bushes. Traction is going to be at a premium!
    • Hello,   My name if Frederick, i'm 30 years old and I live in Belgium, Europe! I used to have a Nissan 370z daily but since I got a company car I turned that into my seattime driftcar. About 3 years ago I also wanted something older with more feel, so I got an R32 GTST with an rb26 engine. I am now getting the rb built to have around 800hp and it's close to being finished. I'm very excited for how it will drive and how driveable it will be! Regards, Fred!
×
×
  • Create New...