34 Gtt Plenums

[r34unit]

hay just wondering what i should look for when buying a plenum for my r34 !

and what will i have to modify to put it on ?

ive found some plenum on ebay ! has any one bought one ? thanks ?

[Tai1or Made]

Search.

On here or google.

[GTSBoy]

The first thing you need to look for is a reason. There are not many good ones. Just wanting one is not enough of a reason.

[Marcus89]

The first thing you need to look for is a reason. There are not many good ones. Just wanting one is not enough of a reason.

Agreed really is not worth it

[r34unit]

shorter cooler piping. and a increase in hp !

or would it be better if i modify the stand one and place the throttle body at the front of the plenum.

[GTSBoy]

Shorter cooler piping is a very marginal benefit. The idea that changing the total length of your cooler pipig will improve response or decrease "lag" in a really noticable way is a nice one to have in your mind, but that's about the extent of its connection to reality.

An increase in HP. Hmmm. Again, a nice idea, but given that it is only a handful of kW, and given that most front facing plenum designs (that replace the bottom half of the inlet manifold as well as the top) end up with shorter runners so that you actually lose some mid range, it isn't actually a big worthwhile benefit.

The only real benefits are that you get the cross over pipe away from the hot side of the engine, making it easier to fit a high mount turbo, and that you tidy up the engine bay a bit. But that tidying is really more aesthetic and provides a little better access to do work. It's not really a major improvement in how well the engine does what it is supposed to.

Sure, for trully massive HP builds, an FFP can be set up with big internal volume and so work better at full noise. But for most builds, it is barely worth the $$ and effort.

[msports180]

I think it comes down to your ultimate power goal and engine bay appearance goal. We all know the appearance is important to most people just as much as power.

I have the stock plenum and it looks like arse, but my goal was a punchy reliable 400rwhp. The stock plenum will do this and more with ease. I couldn't see the point spending at least $700+ for a plenum then more for all the fidly bits people dont acount for to only gain appearance gains.

If you want engine bay your proud of then id consider Plazmaman, they look nice and are the easiest to bolt up, and from most accounts retain the most response.

If your only after say 400rwhp then spend it on something else like suspension or brakes.

[r34unit]

ok fair enough.

how about fmic, is it best buy a return flow kit like the ones that the piping go thought the same existing holes ?

and the a/c fan............. well i think its an a/c fan. the one that sits in front of the radiator. will that have to be removed ?

im sure their is a tread on it ? whats it called ??

cheers !

[GTSBoy]

In some respects, yes, it is better to use a turn flow cooler. That way you don't cut any holes in the inner guards. Non-original holes can get you in trouble with the defect nazis. Having said that, turn flow end tanks are probably not quite as efficient when it comes to pressure drop, and you can only fit a smaller core with turn flow than if you have straight through.

And you don't have to pull the air con fan out unless going for really thick cores.

[KiwiRS4T]

If you want / need you can replace the stock aircond fan with a thinner aftermarket one.

[mystery_kid]

as gtsboy said

pretty much a waste of time unless you have done every possible thing to your engine and turbo and are trying to squeeze every little bit out of it, sounds like you aren't in that position if you don't even have a fmic yet

if you're all worried about cutting a small hole inside the engine bay for a normal fmic setup you can get a return flow cooler

[r34unit]

no i was thinking of doing a front facing plenum and cooler at the same time !

but since ffp are not need unless ur making more than 400 at the rears than i should just get a return flow cooler

[a31rb25]

If you just want to tidy up the engine bay a little go for a GKtech cooler from his 'no holes' kit. inlet & outlet are on the same side. I've recently purchased one to do the same thing after the next track day.

[Crazy Xav]

BTW, don't modify the standard plenum to move the TB, the runners are designed to receive air from top, center. If you move the throttle body to the front the air flow to each cylinder will be effected.

FFP's are nice but more or less unnecessary. I have one but its been more than a 'Bolt-on' affair. Hole cut, throttle cable mounts, extended wiring for sensors etc. Someone correct me if I'm wrong but I think you need a R33 IAC unit for most FFPs into 25neos.

[funki_munki]

ive been looking for the same for my car,i know im not going to gain alot of hp if any,or if the shorter cooler piping will make a difference.the main reason is to tidy the engine bay up as ill be running a top mount setup and dont want pipes running all over the hot side of the engine bay. Ive been reading through many forums trying to decide what the best option for a neo would be that would require the least amount of work for it to fit. alot of people run the greddy/freddy ffp and use an adaptor plate for the iac valve,im not a big fan of this and i have only found 1 other type of ffp that is made for the neo and fits the neo iac and pretty much all the stock parts will fit. Its sold on ebay and made by a company called PnT performance in thailand, i know this is starting to sound a bit questionable but from further investigation to their ffp on 2jz's (alot of reading through supra forums) all of the buyers were happy with the product and only a minor few requiring facing.

Thats what im going for anyways,they sell for about $699+$175postage, nethless to say i am also upgrading pretty much everything else so a ffp is waranted.

Kando TD06h 60-1

Top mount manifold

Turbosmart 40mm compgate

aeroflow billet alloy fuel rail (i know its not needed,i really shouldnt be allowed ebay while drunk lol)

siemens deka 650cc injectors

1.3mm pmslr head gasket

arp head studs

tomei type a poncams (think 252 in/ex)

plus all the other little odds and ends to make the above work

Allready have nistune,splitfires,3" turbo back w/100cell metal cat and a HDi fmic.

if your only looking for around the 400rwhp mark,you shouldnt need a ffp as many people have proven in the past with much higher hp.

[msports180]

Wouldn't worry about the head gasket and studs unless there is another reason for the head coming off?

I have seen the plenums you are talking about, they don't look to bad. Just remember if you have a FFP on a neo you will need a R33 TB or after market, and then if you want to retain your Nistune you will need it to have a Stagea image put into it to remove the TCS.

I have the standard plenum with a fabricated cross over pipe, not the prettiest, but i made 380rwhp @ 17psi with it, we ran out of time to push it more, but showed no signs of restricting anything.

[Tai1or Made]

Similar piping route as mine.

[GTSBoy]

then if you want to retain your Nistune you will need it to have a Stagea image put into it to remove the TCS.

Not quite true. Since that was the wisdom of the time, Matt and I found a number of the DTC switches could be used to turn off the TCS stuff. I actually do not know if it will prevent the strange fuel/boost cut thingo that was happening with R34 Nistunes when at very high TP, but it would be worth a try to do it this way before going to the Stagea image.

[funki_munki]

car was originally a non turbo auto converted to turbo manual. Never had tcs work,got rid of the tcs throttle body and have a r33 s2 which ive fitted the neo tps to. The pnt ffp use the standerd iac valve so no need to swap to an r33 item.

As for the nistune,im not sure what the boys at jaustech did when i had it installed as to what image is on it,either way it worked lol.

Im doing the head gasket as i might aswell do it now instead of it blowing later on and having to get it replaced (while most of the bits are off i might aswell replace it) studs i picked up for 200 and figured it was a worth while investment as you shouldnt reuse head bolts.

thats a nice setup neil,what turbo you have?