Jump to content
SAU Community

Recommended Posts

hey guys

looking at getting a plenum for my rb25 there are alot of cheap chinese manifolds that need alot of cleaning up (porting) and dont flow that well. does anybody know of any plenums available with good flow short runners and preferably fabricated alloy plenum chamber something like hypertune.

Link to comment
https://www.sau.com.au/forums/topic/233027-whats-the-best-rb25-plenum/
Share on other sites

well its depends on your setup, cams, turbo application and of course budget, the greddy one works well and i have never had an issue with one, the hypertune stuff is killer but more expensive and would suit somehting more radical. The cheap thai stuff on ebay seems to work real weel on RB20 but im yet to use one on a rb25.

well its depends on your setup, cams, turbo application and of course budget, the greddy one works well and i have never had an issue with one, the hypertune stuff is killer but more expensive and would suit somehting more radical. The cheap thai stuff on ebay seems to work real weel on RB20 but im yet to use one on a rb25.

whats the finish like on the cheap thai stuff how well does it fit?

whats the finish like on the cheap thai stuff how well does it fit?

i get these ones : http://motors.shop.ebay.com/merchant/pnt_performance

the other ebay ones (Greddy Copies) ive used are shit, i will NOT fit them regardless... ive seen quite a few leak coolant into Number 1 runner and various others crack after a few months (dont ask me how in the world they could make it so crap that it cracks but they did)

well its depends on your setup, cams, turbo application and of course budget, the greddy one works well and i have never had an issue with one, the hypertune stuff is killer but more expensive and would suit somehting more radical. The cheap thai stuff on ebay seems to work real weel on RB20 but im yet to use one on a rb25.

i buy heaps of those ebay plenums made in thailand but i only buy the plenum half

i sent them an email asking if they would sell me the plenum half on its own and they agreed the reason why i dont use there whole plenum is because i dont like there runners and trumpets, i dont like the shape of the trumpets and i dont like the ruff casting of the trumpets so i only buy there plenum half on its own and use my own custom runners/trumpets

the plenum half is unreal! its casted, nice looking shape, good size and its very very thick and they also sell the plenum half on its own for a pretty good price

the plenum half is unreal! its casted, nice looking shape, good size and its very very thick and they also sell the plenum half on its own for a pretty good price

tuff maybe you can supply me one of your "modded" versions next time to have a play with? i would rather pay some-one local (and a community memmber) than send the coin offshore ? providing of course they are indeed superior in the runner department.

i buy heaps of those ebay plenums made in thailand but i only buy the plenum half

i sent them an email asking if they would sell me the plenum half on its own and they agreed the reason why i dont use there whole plenum is because i dont like there runners and trumpets, i dont like the shape of the trumpets and i dont like the ruff casting of the trumpets so i only buy there plenum half on its own and use my own custom runners/trumpets

the plenum half is unreal! its casted, nice looking shape, good size and its very very thick and they also sell the plenum half on its own for a pretty good price

thats the kind of info thatim interested in thanks for the info ill see whati can get my hands on as far as runner

if any body else has helpfull info it is greatly appreciated

thanks

plazmaman use factory runners which are fairly long aswell i was trying to steer cleer of the long ugly runners

thanks guys im thinking jun copy plenum chamber and custom runners might be the trick

ill let you all know how well it works (before and after dyno results)

thanks

keeps ideas coming if you have any others

I got a plazmaman one and no comlaints here, but yeah the factory runners look like dick. Thinking if i take the head off to clean out the casting marks on the inside of them and then getting the outside chrome dipped to match the plenum :D

  • Like 1

to be perfectley honest the best upgrade ive done on RB25 is std RB26 individual TB's and plenum. on a std GTT (neo) expect a maximum increase of 40hp and no dips below the factory torque or power curve. The response of the ITB's is awesome and the flow of the factory GTR is great (nismo is better all round) but expect to pay similar money for the comlete setup when comparing it to a greddy setup with Q45 tb etc etc... I know RACE PACE now has the (BEST) conversion kit available for this swap, it is based on the BLITZ D1GP kit.

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

    • I have no hard data to report, but I have to say, having driven it to work and back all week, mostly on wet roads (and therefore mostly not able to contemplate anything too outrageous anywhere)..... it is real good. I turned the boost controller on, with duty cycle set to 10% (which may not be enough to actually increase the boost), and the start boost set to 15 psi. That should keep the gate unpressurised until at least 15 psi. And rolling at 80 in 5th, which is <2k rpm, going to WOT sees the MAP go +ve even before it crosses 2k and it has >5 psi by the time it hits 90 km/h. That's still <<2.5k rpm, so I think it's actually doing really well. Because of all the not-quite-ideal things that have been in place since the turbo first went on, it felt laggy. It's actually not. The response appears to be as good as you could hope for with a highflow.
    • Or just put in a 1JZ, and sell me the NEO head 😎
    • Oh, it's been done. You just run a wire out there and back. But they have been known to do coolant temp sensors, MAP sensors, etc. They're not silly (at Regency Park) and know what's what with all the different cars.
    • Please ignore I found the right way of installing it thanks
    • There are advantages, and disadvantages to remapping the factory.   The factory runs billions of different maps, to account for sooooo many variables, especially when you bring in things like constantly variable cams etc. By remapping all those maps appropriately, you can get the car to drive so damn nicely, and very much so like it does from the factory. This means it can utilise a LOT of weird things in the maps, to alter how it drives in situations like cruise on a freeway, and how that will get your fuel economy right down.   I haven't seen an aftermarket ECU that truly has THAT MANY adjustable parameters. EG, the VAG ECUs are somewhere around 2,000 different tables for it to work out what to do at any one point in time. So for a vehicle being daily driven etc, I see this as a great advantage, but it does mean spending a bit more time, and with a tuner who really knows that ECU.   On the flip side, an aftermarket ECU, in something like a weekender, or a proper race car, torque based tuning IMO doesn't make that much sense. In those scenarios you're not out there hunting down stuff like "the best way to minimise fuel usage at minor power so that we can go from 8L/100km to 7.3L/100km. You're more worried about it being ready to make as much freaking power as possible when you step back on the loud pedal as you come out of turn 2, not waiting the extra 100ms for all the cams to adjust etc. So in this scenario, realistically you tune the motor to make power, based on the load. People will then play with things like throttle response, and drive by wire mapping to get it more "driveable".   Funnily enough, I was watching something Finnegans Garage, and he has a huge blown Hemi in a 9 second 1955 Chev that is road registered. To make it more driveable on the road recently, they started testing blocking up the intake with kids footballs, to effectively reduce air flow when they're on the road, and make the throttle less touchy and more driveable. Plus some other weird shit the yankee aftermarket ECUs do. Made me think of Kinks R34...
×
×
  • Create New...