Cut And Shut Plenum

[StevenCJR31]

no...but it does make spark plug changes sooooo much easier

hell yeah, depending on the particular intake / car some other stuff may have to be moved around (battery??)to accomodate the repositioned tb

but it would be worth it just for the better accesss to plugs/ignition coils

[StevenCJR31]

When the AUD was trading at USD55c and Greddy and Nismo plenums were extremely expensive a cut and shut might have made sense to someone.

Today you can buy a buckchoy front facing plenum for a round of drinks.

hopefully the quality will have improved with time, id be annoyed if i spent hours fitting up a china intake just to have the bastard leak on me

[WMDC35]

you'd definitely want to pressure test & check the top hose insert isn't too loose, may need to surface it as well, after that should be fine

[AMR33]

Example

Is that yours mate? Any problem with it, leaning out etc?

[Soundboyracer]

It's not mines but I got the picture online. The one below is my friend car. Rb25. He literally beats his car. Drifting, burning out and he also daily the car. No problems so far. 3rd year it's like that

[AMR33]

It's not mines but I got the picture online. The one below is my friend car. Rb25. He literally beats his car. Drifting, burning out and he also daily the car. No problems so far. 3rd year it's like that

Did he notice significant or any improvement at all?

[Soundboyracer]

Nope. He just did it so he can easily service his car. Coilpacks ect

[GTSBoy]

sigh.

[Ben C34]

Maybe we need a pro and cons list.

pros

less pipe work

easier to change plugs

cons

unknown effect on air distribution

better chance of a defect

then it's just a matter of weighing it up.

[Ben C34]

That sucks there is no formatting ... stupid phone

[AMR33]

I guess the best way is if someone goes on dyno with normal plenum and then does the C&S job and see difference. Highly doubt there would be any volunteers.

I also add to SUPERBEN's con list that it could lean cylinders out although we have no proof of this thus far

[Kinks]

sigh.

Don't worry mate, I agree with your sentiments exactly.

If people want to screw up their cylinder balance that's their prerogative. It is just a big flashing RUN AWAY sign if I see a car like that, I instantly know the owner has taken many other shortcuts.

Mostly I just feel sorry for the car. Nissans deserve better.

[WMDC35]

ok here's the list

Cut & Shut Plenum:-

PROS: CONS:

None It's a POS

Seems to cover it?

[Kinks]

ok here's the list

Cut & Shut Plenum:-

PROS: CONS:

None It's a POS

Seems to cover it?

but bro, my mate Habib said it would be fully sik and give me 20kw more powah!

how can you argue with THAT.

[ARTZ]

but bro, my mate Habib said it would be fully sik and give me 20kw more powah!

how can you argue with THAT.

but bro, a bunch of internet people just told me it wouldn't work with no factual evidence to back up their claims..

how can you argue with that?

reading through some toyota forums and they have the same arguments on there about the old 7m intake and the jz ffp...now it looks to me the JZ just put the throttle body on the front of the plenum...there was no dramatic changes to the runners or anything its all the same shit...but the TB is on the front now....maybe they realized it makes no difference whatsoever where the TB is when the charge supplied is under pressure...Thats what a plenum is for to accumulate and store the intake charge..the cylinders will then suck in what they need, when they need it..maybe it would make a difference on a NA that has to draw the air in itself..but a boosted car has a plenum full of boosted air...there is plenty there for everyone...

now i imagine the internet theorists are now saying but the forced air is getting pushed to the back cylinders more which is causing it to lean out there...but by that theory one would have to assume the stock design is just forcing more air into the middle cylinders in which case the end cylinders would still be leaning out

So while I do agree it looks like balls...I'm not convinced it is a bad idea.....its just an ugly one and we have all been balls deep in an ugly one before..

[AMR33]

but bro, a bunch of internet people just told me it wouldn't work with no factual evidence to back up their claims..

how can you argue with that?

reading through some toyota forums and they have the same arguments on there about the old 7m intake and the jz ffp...now it looks to me the JZ just put the throttle body on the front of the plenum...there was no dramatic changes to the runners or anything its all the same shit...but the TB is on the front now....maybe they realized it makes no difference whatsoever where the TB is when the charge supplied is under pressure...Thats what a plenum is for to accumulate and store the intake charge..the cylinders will then suck in what they need, when they need it..maybe it would make a difference on a NA that has to draw the air in itself..but a boosted car has a plenum full of boosted air...there is plenty there for everyone...

now i imagine the internet theorists are now saying but the forced air is getting pushed to the back cylinders more which is causing it to lean out there...but by that theory one would have to assume the stock design is just forcing more air into the middle cylinders in which case the end cylinders would still be leaning out

So while I do agree it looks like balls...I'm not convinced it is a bad idea.....its just an ugly one and we have all been balls deep in an ugly one before..

I think thats the most plausible response on the topic thus far

[FBRacing]

The only down fall I see with a cut & shut is the way the air travels. If looking a stock manifold from the side, it makes a flow able loop from TB to head ports. No hard hitting junctions. When I see the cut & shut manifold, I see the air damning in the back before it starts making a loop around. Looks like extra work for the air flow. I think the Greddy version helped with that hiccup while gaining air volume for less restriction. But then again it still rams the back. If you also compare to Honda motors which are insanely mechanical marvels making a 100hp per liter N/A, it has the same style of engineering as a Greddy style manifold from factory. Just my thoughts. It does seem like a lot of work though to gain easier access to the plugs and coils. But I must admit it does look unique. First time I've seen that to be honest. But that is what is so cool about this engineering stuff with motors, it just might work better than a Greddy. It'd be awesome if someone had some dyno tests done between the different styles. Low, mid, and high end lost or gains.

[BLITZ-26]

2 mates cars run a cut and shut one has 300kw other has 360kw both running for 2-3 years tuner noticed decreance in intake temps but no leaning on cylinders.

I have one I am about to throw on mine as in a 180sx the crossover section hits the bonnet etc

[jet_r31]

but bro, a bunch of internet people just told me it wouldn't work with no factual evidence to back up their claims..

how can you argue with that?

reading through some toyota forums and they have the same arguments on there about the old 7m intake and the jz ffp...now it looks to me the JZ just put the throttle body on the front of the plenum...there was no dramatic changes to the runners or anything its all the same shit...but the TB is on the front now....maybe they realized it makes no difference whatsoever where the TB is when the charge supplied is under pressure...Thats what a plenum is for to accumulate and store the intake charge..the cylinders will then suck in what they need, when they need it..maybe it would make a difference on a NA that has to draw the air in itself..but a boosted car has a plenum full of boosted air...there is plenty there for everyone...

now i imagine the internet theorists are now saying but the forced air is getting pushed to the back cylinders more which is causing it to lean out there...but by that theory one would have to assume the stock design is just forcing more air into the middle cylinders in which case the end cylinders would still be leaning out

So while I do agree it looks like balls...I'm not convinced it is a bad idea.....its just an ugly one and we have all been balls deep in an ugly one before..

agree with this 100 percent..funny as..maybe its not worth doing..i agree with that....will it lean out cylinders..i highly doubt it, have a funny feeling you

have more problems with tapered plenums in that regard, but i have no factual evidence to back that up

cheers

darren

[zebra]

Just beacuse the jz manifold looks similar on the outside they are vastly different internally