Jump to content
SAU Community

Recommended Posts

Gday all after some longggg hunting im thinking of seeing anyone thoughts on modifying a rb30 turbo exhaust manfiold to suit a rb25 as i really want to stay low mount with my rb25/30 not to keen running a external gate on a stock rb25 manifold as i dont think i will hit the 320rwkw mark on lowish boost hence after looking at the rb30 turbo manifolds it looks like it would be perfect to fit a wastegate right on top of the merge collector

just looking to see how much roughly this would cost and if its just a matter of cutting and re welding the flange to suit the rb25 im trying to keep my manifold budget under 450 and cant really find a hks manifold around for this

any help would be great cheers

Link to comment
https://www.sau.com.au/forums/topic/378986-rb30-manifold-on-rb25/
Share on other sites

you wont have a proper external gate setup for under $450, simple as that.

the hks manifolds can be had for around 600, but as with any aftermarket manifold theres other costs in getting it all together and running.

ive found a few hks manifolds for 400 but they sell before i get a chance to buy them

all i want to know is if i get the exhaust flange on the rb30et manifold changed to a rb25 are all the spacing correct is it only 2 or 3 flanges that need to be changed also will it fit and will it flow better then a stock rb25 manifold

i can get a vl turbo manifold for 100 another 150 to get a wastegate flange welded and the flanges changed

stock rb25s ive been told and after reading a lot of dyno results they hit a brick wall around 280-30rwkw mark im currently aiming for 320rwkw atm then push it to 350rwkw on my rb25/30

i have a highmount but would love to try something different with the rb30 idea

wait your talking about a standard vlt manifold? they flow the same if not worse than a standard 25 manifold. absolute waste of time modifying it to fit.

you cant set it up to handle 350rwkw with a budget of only $450. either use a standard manifold and setlle for less power or keep saving and do it properly

ive seen alot of guys including my mates make well over 320 out of a stock vlt manifold my old hr31 coupe made that out of a rb30

my $450 budget is only for a manifold nothing else

if i cant get 320rwkw out of a low mount manifold

i will keep my highmount and settle with that

but would love a low mount

really on a stock 25 manifold???

all the results ive seen on the rb25/30 thread i couldnt see more then 2 on there

320rwkw is a personal goal im trying to reach i want more then what ive had before ive had a hr31 coupe with 310rwkw a charged 355 with 308rwkw its just something i want

no idea what a r33 with a rb25/30 fitted with a gt3582r with 320rwkw will be like to drive on the road but hey thats the fun part

it just came across my mind i wonder if a rb30 manifold could fit but if it wont its ok ill stay highmount if i cant find anything else

only reason why i like the 30 idea is it looked alot like the hks manifold design

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

    • That's a good point. The rears of the covers themselves have no baffling at all though. Higher up more chance of air for venting the crank case. Lower on the side more likely to be submerged. I might be able to fit them on the sides but with both the sump drain fittings being on the drivers side the passenger one will need to make a U Turn and be nearer the turbo. But it will look neat being not up on top.
    • It won't likely matter where along the cam covers you put the big fittings. I would suggest putting them on the sides if you can, simply because it will reduce the flow up through the baffles and thus reduce the amount of oil that gets put into the foam. It might not matter, but it seems like something to consider as a worthwhile thing to avoid.
    • Well, I have my IM240 results with a cammed LS1... My Nox was 0.11 and my CO g/km was 0.2. Euro4 is 0.08 and 0.1 respectively. I'm gonna say for a stock RB this is actually plausible, BUT in Australia they were complied pre-Euro2, so the limits were: Which as you can see, is way higher. I'd say a stock RB with a new OEM Cat could? actually pass Euro4 for NOX but you'd probably have to do a hell of a lot of testing to prove it, and getting a car emissions tested and carrying a certificate of emissions when/if you get pulled over may be cost prohibitive if it's even allowable to get your car tested and re-classified. You'd have to find out what the UK Govt is using as reference material. It may be non-negotiable.
    • I made a little more progress last night and added some E85 safe fuel tank baffle foam in behind the stock cam cover baffle plate.  It still feels really wrong shoving foam inside the engine but apparently its fine based on it pretty much being the MINES/Hi-Octane RB26 cam baffle kit and the few posts here I have found of people doing it and the lack of posts saying the foam broke down and ruined the motor... Still plan to check it frequently though lol The last step for this round of oil control modifications I plan to make is to add some -12AN fittings to the cam covers and connect them to some (already existing luckily) -12AN fittings on the sump. Basically a sudo head drain/sump breather/pressure equaliser without having to remove the motor and do the one on the rear of the head. My plan is to add them to either the tops or the sides of the cam covers at the back. unless there is a compelling reason to have them at the front on the sides which i have seen a few times though they were all on RB26 cam covers from memory so that may be due to the stock breathers being on the back and the integral baffle being different ?    
×
×
  • Create New...