Jump to content
SAU Community

Recommended Posts

  • Replies 54
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

I also installed 3 inch exhaust from the dump pipe ( 2 resonators only, no cat ) and K&N pannel filter. With the RB20DET actuatoer i was hopeing to lock boost at 10psi but the boost goes up to 11.2psi and i have huge power loss.

But with RB25DET actuatoer it holds 7psi through out the power curve and give good power.

Explain the power dip, as u mention some thing about the computer?

dude ...u may wanna check your intercooler piping clamps and make sure they are tight and not leaking ....

check for vacum leaks etc .. and u may wanna re-set ur ECU especially after u have added extra bolt - on modz.

also check the exhaust manifold for cracks and u may wanna replace the gaskets etc... if u have not done that yet ..but if igured u have since u replaced the turbz already ..

  • 7 months later...

finally tried fitting my rb25 turbo onto my rb20 yesterday.

with no success.

seems my water and oil feed banjo bolts on my rb20 turbo are smaller then on the rb25 turbo i got.

all i can think of is that my rb20det engine is a series 1 engine.

is it just a case of using the original rb25 turbo banjo bolts?

or will i need the rb25 water and oil lines aswell?

any info could help me

cheers.

anyone here with first hand experience with a rb25 turbo onto a series 1 rb20 engine?

Edited by RSTME

RSTME- check the link bellow. I've done this a while back and you got all the info in there.

http://www.skylinesaustralia.com/forums/in...5+turbo+upgrade

Hui - My car is Auto as well and I haven't had any issues at all.

Edited by nedb
no.. I have a s1 engine (1989) rb20, and was able to use exact same factory fittings to fit rb25 turbo.. No other changes required.

So either your "rb25 turbo" is not in fact one, or well I don't know :P

it is a rb25 turbo steel front wheel and ceramic rear wheel.

nedb. thanks mate,ill ring around for some new lines.

  • 3 weeks later...

k,i got $120 connections for the new lines,r33 turbo is on now

i have a manual boost controller(T-piece thing)

took it for a spin, hit over 20psi so i turned it down.

also noticed it now runs heaps rough(like an old v8)

will it idle normal when i get a SAFC and get it tuned?

also i noticed the last bolt for my exhaust manifold is missing.

Now ive turned it down so far it only boosts to 5psi in first gear at 5000rpm, then easy makes 15psi in 2nd at about 4500-5000rpm.

automatic

r34smic

3"dump/frontpipe

3"highflow cat

3 1/2" fromt cat-back.

im using a rb20turbo actuator aswell,should i try removing the T-piece boost controller?

the hose from my actuator runs to the T-piece then to the compressor housing.

is that right?

Edited by RSTME
  • 2 weeks later...

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

    • Thanks everyone for the replies and suggestions. Got the seats out (hoping I could find some existing grommets but no such luck). By tapping and measuring etc. I could figure out where I could drill through if needed. But first I borrowed an inspection camera and managed to go through factory holes in the chassis rail and could see that the captive nut was holding steady which is why it could retighten. So it was indeed a stripped section of thread, so I applied downforce by levering the bolt head with a screwdriver and went slowly back and forth until it came out. Camera helped a lot cos I could monitor that the captive nut was holding tight. Now I just have one very seized main subframe nut to tackle 馃槄
    • BOVs do have a purpose, if you ever log pressure before and after the throttle body, you will see a spike pre throttle on lift off from a WOT condition. Enough to bend throttle blades / damage e-throttle motors or simple assist in blowing off cooler pipes. FWIW, the above on really applies to those running at least 2 bar of boost. OP shouldn't have an issue, on the other hand, here are some videos of my shit box over a decade ago with some succulent dose with the airbox on and off. That shit box is unrecognisable these days 馃珷    
    • I've tried all different combinations of BOVs/ no BOV and stock bypass valves over the years, on gear changes the stock bypass valve seems to get the car back on boost quicker because in part the turbos wheel speed isn't being slowed down by reversion, although they have issues holding boost much over the stock setting. Most aftermarket BOVs you can adjust the spring, tighter will make it open later and close sooner, but in my experience it'll cause a bit of flutter at low load/rpm anyway. I've also got some input into this whole no bov causing turbo wear, never had an issue on any on my turbos HOWEVER, I got my R33 GTST with 200k kms on it, with from what I can see still has the original turbo, no lateral shaft play but has about 4-5mm of play in and out which to me seems like a worn thrust bearing from years (100-150k kms?) of turbo flutter running no bov, so maybe there is some truth to it in the long run. But that'll never stop me loving the Stutututu while I have the car.   OP just wants to know if he can run a atmo vented BOV with no major issues and the answer is YES, plenty of people do it, there's no harm in installing it and seeing how it runs before spending $$$ on an aftermarket ecu, last time I bought a Nistune it was $2400 for install and a tune , unsure of todays prices but you get me. Crazy money to spend just to fix the minor inconvenience of stalling that can be overcome by letting the revs come down to near idle before putting the clutch in or a little bit of throttle to avoid it. You're better off leaving the ecu and tune for after a bigger turbo/injectors have been installed to take full advantage of the tune and get your moneys worth.   Let OP have his Whoosh sound without trying to break his bank haha
    • I see you missed the rest of the conversation where they have benefits, but nothing to do with avoiding breaking turbos, which is what the aftermarket BOV made all the fan boys, tuners, and modders believe was the only purpose for them...
    • But they do so for the other reasons to have a compressor bypass. It's in the name.
  • Create New...