Jump to content
SAU Community

Recommended Posts

hi im doin a RB 25/30 specs include :

spool RB30DET (DOHC) Rebuild Kit CP 9:1 , RB head oil drain kit, Camtech 268/272 cams , RB25det head , RB20 covers, oil pump spool, crank collar, turbo manifold 6booost,

RB26dett plenum, HTA GT3586R turbo , water pump N1, R34 RB25det 5 speed gearbox

some pics :

RB30 as i got it

301807_10150785934155974_1967304187_n.jpg

RB25det head as i got it

467552_10150585369340974_1778638164_o.jpg

RB25det head sittin on the RB30 block with the RB20 covers and with a modiffied KKK turbo just for looks!

544993_10150851561440974_1152166161_n.jpg

will add more pics as i go

CHEERS Oscar

Edited by MRHD66
Link to comment
https://www.sau.com.au/forums/topic/403700-my-rb2530-build/
Share on other sites

  • Replies 43
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

How is the rb26 plenum going onto the rb25 head? Pretty sure they aren't compatible without a shite tonne of modifications.

Also, you should have put this in the build section!

power tune do a manifold adapter kit that I will be using
Link to comment
https://www.sau.com.au/forums/topic/403700-my-rb2530-build/#findComment-6423063
Share on other sites

how so mate

The water galleries are offset from one another so the plates need to mismatch to create an angle. You cannot use a gasket in between the two halves as it will block the outer one

They may be ok but from personal experience they are a complete f**k around to seal properly. Most people just use a tonne of silicon but that can block the water gallery and present its own problems

They may have changed the design since I saw the last one though so put up some pics once you get it

Link to comment
https://www.sau.com.au/forums/topic/403700-my-rb2530-build/#findComment-6423240
Share on other sites

how much f#cking around Is gettin VCT to work on a RB26 head

For me.....none at all.

I'm not suggesting you go RB26 head but there are no gains by going RB26 plenum and throttles. In fact, your tuner is going to have an extremely hard time making it run nicely. You have essentially lengthened the intake runner by another inch or more which creates all kinds of problems with air bouncing back from the valve head and transient throttle at lower revs.

You are definitely better off with a Greddy or similar.

Link to comment
https://www.sau.com.au/forums/topic/403700-my-rb2530-build/#findComment-6423271
Share on other sites

For me.....none at all.

I'm not suggesting you go RB26 head but there are no gains by going RB26 plenum and throttles. In fact, your tuner is going to have an extremely hard time making it run nicely. You have essentially lengthened the intake runner by another inch or more which creates all kinds of problems with air bouncing back from the valve head and transient throttle at lower revs.

You are definitely better off with a Greddy or similar.

how much it cost to make RB26vct and do u use a RB25neo intake cam? I know it's not just cam too Edited by MRHD66
Link to comment
https://www.sau.com.au/forums/topic/403700-my-rb2530-build/#findComment-6423277
Share on other sites

how much it cost to make RB26vct and do u use a RB25neo intake cam? I know it's not just cam too

It's about $2500 with the head off.

No we designed our own custom camshafts. It's also important to consider valve clearance so not something I would recommend attempting at home

Link to comment
https://www.sau.com.au/forums/topic/403700-my-rb2530-build/#findComment-6423279
Share on other sites

It's about $2500 with the head off.

No we designed our own custom camshafts. It's also important to consider valve clearance so not something I would recommend attempting at home

yeh mate I will get all that done when I get the VCT oil feed welded up
Link to comment
https://www.sau.com.au/forums/topic/403700-my-rb2530-build/#findComment-6423368
Share on other sites

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

    • Old Son, did you re-use the Holden ABS in the new shell or try a different module?
    • Yeah, nah. I had the actuator rod off it today. The arm will not move at all. Neither out, nor in. Yeah, you'd think so, but I've been thinking about that. Even when the actuator rod fell all the way off at the beginning of this saga, it would build more boost and faster in lower gears than it would in higher gears, and you'd think that that was the opposite of what should happen. But I strongly suspect that there is a thing with the gearing getting the revs to rise faster, that there must be some transient effect with the gas flow rate rising quickly, that you don't get with the more steady state case of the higher gears. Keep in mind - the gate is not shut in either of my weirdnesses. So things are not "normal". We normally think about a turbo spooling up (below the wastegate target) with the gate shut. I have all sorts of mental models running now where the gate is a little bit open, and having it stuck open allowing gas out while it should be going through the turbine has all sorts of weird effects (in these mental models). I'm thinking in the higher gears, the ex mani pressure builds to the point where enough gases spill out the wastegate to just prevent the pressure rising much more at all, or just creeping up, all the whole the revs are increasing and getting closer to the point where a gear shift becomes necessary.
    • Is it possibly wastegate actuator itself is sticking, or even the rod to flapper? Otherwise I reckon things are getting a bit rusty/worn   Also odd it won't boost in 3rd to 5th, but will in 1st, I'd expect the other way around with it slightly open as there's more time on your way to redline for it to spin up
    • Does anyone know ow what these two plugs are for and if they should be unplugged? Just put the dash back together and can't remember if these were plugged in before or unplugged! (Blue and white plugs) 🤦🏽‍♂️
    • Did some FASTing ...got the impression that the actual part# was a moot point ; seems all of these hardlines for coolant are discontinued/NLA... like, I take it you're after the hardline that bolts onto to the manifold...that's NLA according to amayama & nengun .... ...just to clear up some confusion, they typically mounted the AAC valve to the intake manifold somewhere near a coolant passage, so the body of the valve heats up & holds it open when engine's up to temp - no coolant flows through the valve, it's a mechanical, thermal connection.
×
×
  • Create New...