Jump to content
SAU Community

Recommended Posts

Hi Guys,

I'm just about to fit a GReddy/Trust plenum to my car - and will be doing back to back dyno runs before and after the swap with no other parts else being changed, maybe a bit of a teak on the tune depending on what we see. - So I'll have a good idea finally on exactly what gains to be expected. (My car not stock tho, so results will be in the context of my car)

I'm very excited about this change so I'll post the the results after I get them.

Cheers,

  • Replies 64
  • Created
  • Last Reply

Top Posters In This Topic

Why would nissan put it on most of the skyline models if it wasent efficent and obiously they have spent alot of R&D on it.

I'm not necessarily convinced that these plenums are a good bang for buck upgrade, but I'm always amazed that people say this!?

anyone who has ever worked in an engineering environment knows that in design, there are two considerations

1.) is the design fit for purpose

2.) cost

the notion that nissan spent years pondering the best way to extract small HP improvements and maximum flow from their plenums is just ridiculous. The factory plenum is designed to be as cheap as possible to manufacture, whilst still performing the job adequately for purpose - i.e. low boost road use applications.

it's like saying that they spent a bucketload on r&d for their gts-t intercoolers - because nissan engineers and nissans are good. yet everyone knows that the factory intercoolers have got knobs.

the question for me on the plenum is - can you get it at a cheap enough price to justify the opportunity cost against other mods. i.e., if I spent that (up to) $2500 on something else, could I have acheived a better end result? I'd say no, unless you've done a lot already.

however, if you start talking about $800 instead of $2500...... :D

Why would nissan put it on most of the skyline models if it wasent efficent and obiously they have spent alot of R&D on it.

And why would TRUST/GReddy sell these plenums if they did nothing. And a Good 99% of Jap-tuned beasts have aftermarket plenums.

That's the biggest load of rubbish I've ever heard.

well basically what i'm doin is replacing the plenum on a stock as a rock RB25DET - my reasons are - because i'm putting it in a Silvia and i want the plenum to be clear of the bonnet and for cooler piping reasons - also because i "thought" it gave it a bit more power

so - does the Greddy plenum give the stock RB25DET some more power - if so .. is it worth it because i can get the greddy plenum (surge tank they call it as well?) for about $1100 (about that) delivered to my door.

cheers

BRAD

does the Greddy plenum give the stock RB25DET some more power?

evidently, yes.

if so .. is it worth it because i can get the greddy plenum (surge tank they call it as well?) for about $1100 (about that) delivered to my door.

that, my friend, is up to you to decide.

do you want it because of the performance increase or because of the ease of piping/fitting or both?

bear in mind that you will probably save some money on piping a FMIC if you have a front facing plenum.

thats what i'm still trying to decide - whether its better to pay extra for cooler piping (being stock p[lenum) and puit some of the money towards other shit. but keep thinking as its going into a s13 and the stock plenum does cause some trobbles with the bonnet clearing - as the greddy plenum will sovle it :D i dno hey i still need some "Steering" in the right direction

well basically what i'm doin is replacing the plenum on a stock as a rock RB25DET - my reasons are - because i'm putting it in a Silvia and i want the plenum to be clear of the bonnet and for cooler piping reasons - also because i "thought" it gave it a bit more power

so - does the Greddy plenum give the stock RB25DET some more power - if so .. is it worth it because i can get the greddy plenum (surge tank they call it as well?) for about $1100 (about that) delivered to my door.

cheers

BRAD

Think you might find it's a bit more than that , especially if Customs wants their bit.

Cheers

Ken

o hey Ken :D  quote from Greenline - "Hope that you had a good Christmas and New Year.  

Thanks for your enquiry. Pricing information as requested:  

TRUST Surge Tank (Intake Plenum) R33 GTSt: 78,540 yen  

Shipping: 14,100 yen  

TOTAL: 92,640 yen AU$1158 "

:)

Yep agreed and I actually have one coming and is in Melbourne clearing depot.

They are looking VERY hard at stuff from Japan atm , and I expect to pay customs and duty which will add approx $500 to the cost.

If your lucky you will get it for the price quoted but don't rely on that being the final price.

Cheers

Ken

$500 ??? How does that work ?

Damn - I hope I don't get slugged that much  ! ! ! :(

On the amount already paid for shipping, you can get slugged for import duty (from 11-15% if I recall correctly depending on the type of goods). On top of that you'll then be slugged GST on the original amount with shipping plus the import duty (tax on a tax). Might not be $500, but then I'm not sure how much Ken's got coming in.

I got some HKS dump pipes for my 'R from Greenline, paid just over $700 I think including shipping, unfortunately the shipping bill said the value was $0.00 which of course on a brand new HKS box made them suspicious. So being the honest person I am, I took down the correct invoice and got charged about $190 extra in import duty and GST.

In either case, it bites big time.

Price of plenum $1158

Duty @ 15% $174

Total $1332

GST @ 10% $134

Total $1466

$1466

- $1158

Extra $308

Sorry , forgot that the price of $1158 included shipping.

The price that any company o/seas quotes does not usually include these charges.

If you are lucky , it may come to your doorstep without paying the extra charges but do not rely on that.

cheers

Ken

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

    • Maf is a question mark but TPS  I have set at 0.47, the fact that I’m getting proper voltage range out of it with the key on leads me to believe it’s functioning properly. I’m getting proper voltages on basically everything. I still need to look up voltage ranges for z32 maf and test that 
    • Honestly no not at all, but it’s a very basic tune, it’s stock injectors q45 tps and z32 maf. Other than that it’s a completely stock base map. The file is from nistune and from my understanding if it was tune related I would be able to unplug maf and tps and it would still start even if it was a really shitty start. I have tried starting it with coolant temp, maf, and tps unplugged none of those 3 togethor or individually changes anything 
    • 🏆 Skyline Supremacy Meets Mount Panorama Magic 🏆 Join SAU NSW as we take the long way to Bathurst, the home of GTR greatness. Saturday 30th August 2025 7:00AM Meeting Hanna Park North Richmond 7:30AM Departure Cruise Via Bells of Line Road 9:00AM Arrival to Stop 1: Golden Poplars Meadow Flat 9:45AM Arrival to Final Destination: Mount Panorama Motor Racing Circuit Meet Location: Hanna Park North Richmond Stop 1: Golden Poplars Meadow Flat Final Destination: Mount Panorama Motor Racing Circuit   *Disclaimer* There will be a lead and follow car so no one should get lost. If you would like to attend or bring others along please put your name down and a +1 as numbers will be needed prior! This is NOT a race and we will all be adhering to all road rules. If this is what you want please come to one of our many track days. This is an official SAU:NSW event and will be run under a CAMS permit. One of the things that really sets our club apart is our commitment to being true enthusiasts. When on normal roads we strive to maintain good relations with the authorities as well as the public in general. When attending one of Skylines Australia NSW events please try to: • Be aware of surrounding environment and act accordingly. • Drive courteously on the state’s roads as a true enthusiast should. • Understand how important it is to maintain the good name of SAU NSW and thus, treat others accordingly. • Any misbehavior will not be tolerated and you will be asked to leave.
    • What does it look like with highway driving? And yes, I had a similar thought as Duncan. It looks quite similar in my Stagea and I have made myself accept it as normal. Might have to look into it some day   Highway gets as low as 10l/100km on my end so I'm not as worried about it being a mechanical issue. More likely just the tune on the haltech.
    • While I was waiting for the new parts to come in for the charge pipe and radiator I decided to do some turbo modification. The drive pressure (exhaust backpressure) was a lot higher that I thought it should be. For 32lbs of boost drive was 55lbs. The turbine housing is a 1.10AR and my turbo builder has suggested to go to a 1.25AR. To test if a larger AR would do anything to reduce drive pressure AND not spend any money I decided to hog out the divider in my current housing. I removed it from the inlet and the whole way through the housing.  After reassembly and testing it doesn't look like this modification did anything for reducing drive pressure or requiring more fuel (making more power). Oh well, it was worth a shot. We'll get some data at the track if it makes it past the 60ft. I also machined a $7 shift knob off Amazon to fit my Stillway shifter since I didn't like the Stillway shift knob. Next on the list was the radiator replacement and fabrication of a new intercooler tube that had no silicon coupler. No pictures of this - I was short on time each night after work to get this done and didn't stop to take pictures.  Next was to get the clutch disks out and replaced. Previously when installing the dogbox I had ordered a set of the same sintered iron disks I had been running because I switched to the 26-spline input shaft. I thought it was odd that they didn't have any markings or brand name on them like all my old disks had but installed them anyway. At the track I could not get the clutch to lock up using my normal strategies. After two track nights I reached out to the clutch manufacturer and ask their thoughts. They said they had to switch the material out because they were having trouble getting the original material and that this new material would not take to being slipped very well.  So out with the first set of 26-spline disks and in with the correct material 26-spline disks. While I had the trans out I added an inspection/service hole. I've wanted one of these for a while. Now I can have a look at things and change the front cover shimming when needed (clutch wear). I hustled and got the clutch change done in a few hours on a Saturday. Hopped in the car and drove home. On the way home I did a 1-3 pull. When shifting from 2nd to 3rd the core plug in the back of the cylinder head popped out and dumped all the coolant. Thankfully I was only 30 seconds from home and coasted it there. Datalog showed nothing unusual and 2.5psi of coolant pressure. That plug has been in there since 1992 but I guess it worked its way out. Pulled the trans AGAIN and replaced the plug, JB welded it in, and made a brace. Also deleted the head drain I had added in during the bearing issue fiasco.  I am currently changing my boost control plumbing to make it cleaner. After that is done I'll make another attempt at getting past the 60.
×
×
  • Create New...