Jump to content
SAU Community

Recommended Posts

Check you boost actuator; if it's soft or lazy it will be opening the internal gate too early, causing turbo to be laggy and not boost up properly.

I would personally take it to a mechanic that has a dyno and knows how to diagnose these issues.

*cough* :ermm:

To set the actuator properly the hole on the actuator shaft should be about half a hole short from fitting on the gate pin. You then need to pull the arm so that the pin fits through the hole. This will provide the right preload/tension on the gate.

The std ecu normally runs pretty rich, so if you have a std 7psi actuator i would dare say it would be ok. If you do not have the money for an ecu and tune i would seriously find a w/shop doing a "dyno day", adjust the actuator just before going on the dyno and inform the tuner/mechanic of the situation and to keep an eye/ear out for a/f ratios and detonation. This way it will only cost you about $40-$50, instead of the $120+ w/shops may charge to do a single run.

All the best.

  • 4 weeks later...
  • Replies 40
  • Created
  • Last Reply

Top Posters In This Topic

The rear housing is more of the restriction, not the front

VG30 machine jobbies always choke up

Made over 270rwkw@16psi with mine, proven both on EAS and Racingline dyno's. My old one is now hanging off the side of a std NEO engine making over 270rwkw@16psi too. Any more boost was useless as that's about the limitations of this turbo.

Hardly a "choke up" though :rolleyes:

Made over 270rwkw@16psi with mine, proven both on EAS and Racingline dyno's. My old one is now hanging off the side of a std NEO engine making over 270rwkw@16psi too. Any more boost was useless as that's about the limitations of this turbo.

Hardly a "choke up" though :(

If its @ a limit on 16psi, its choking.

the compressor of that combo is good for over 300

  • 3 months later...

Hello all, I thought i would dig up an old thread.

Have since apgraded injectors AFM and have a blitz front mount and its currently making around 250rwkw on 15psi.

Anyway from other ppls results i have seen that with the 0.62 rear housing this turbo doesnt make much more after around 16psi which i'm nearly at. My question is it worth fitting an adjustable ex cam gear to this setup and getting a retune? I'm running the standard air box with a k&n filter and standard everything else.

Thanks again

James

PS: i did a search but most of the results were in regards to stock turbos. Thought mine might be a little different

Edited by Bond

you should be able to make more power with an adjustable exh cam gear (assuming you are not talking a NEO RB25DET). at the very least you should be able to move the power curve around to where it helps you the most. you can make 5-10kw from midrange to top end.

Also i'm lead to beleive that my 0.62 rear housing is holding me back in regards to top end power (is there any way of testing which side is hiolding me backCan anything be done to get some more out of it or do i have to bite the bullet and upgrade to a 0.82 (or whatever it is).

Thanks

James

check out what the mafia squeezed out of the 0.63 housing on his GT3076.

i am pretty sure you can make at least 270rwkw or thereabouts with the 0.63 housing.

the compressor will clearly flow more but it should make 250rwkw comfortably.

sure you dont want to add Tomei poncams and some head work :P

lol nah, cant comment on that ^ as I havent got my baby back yet, soon my pretties, soon ....

for a larger rear housing, turbo off/on etc, labour from shop, id say $600 to supply/replace rear housing?

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 😅
    • 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 🫠    
    • 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...