Jump to content
SAU Community

Recommended Posts

my car hits 14-15psi at 3000 but drops back to 10-11 at redline. pod, fmic, nice big intake piping, turbo-back exhaust. turboxs bleed too. i'm considering a different actuator, EBC or autospeed boost controller (altho i doubt it would hold it any better?)

  • Replies 89
  • Created
  • Last Reply

Top Posters In This Topic

I tested out my boost holding capabilities last night, it seems to hold 15 pound, but does drop off to 13.5psi or so somewhere high i the revs.

It is hard to watch the boost gauge, tacho and the road at the same time hehe

I will try and get the datalogging going and see if I can get a read out some time this week

Adam

ive already got the details about the hks actuator, sorry i should have posted already/

Hi Dean,

Hope you are well. Pricing information as requested:

HKS Actuator Update Kit R33 GTSt: 11,384 yen

Shipping: 2,500 yen

TOTAL: 13,884 yen AU$170

Notes: The above actuator is rated for use 0.8 ~ 0.9kgf/cm2.

I didnt end up gettin it cos one came available here, yet the person sellin hasnt mad any contact since he posted it for sale. Anyway i have no money atm, so will have to wait a while before i get this.

Cool - that would be nice :)

I think 0.8 - 0.9 kg works out to be about 12-13psi isn't it ??

That's pretty good, and pretty much smack on what I'm looking for. I suppose if you were really keen you could bleed off 1-2psi to get to 1 bar. But at least you would drop boost like I am :D

J

when i get some money ill let u know how it goes.

Does any body have any info on the wastgate actuator for R32 turbo ive heard it doesnt open til 10psi.

Is this true?

Would it fit in place of the r33 item?

Anybody else done this?

HKS one is cheap enough but im not keen on running 12 - 13psi with standard intercooler/turbo. Plus anymore the 10psi and my engine seems to ping on hot days. Gets to over 40 deg there in Horsham.

Does any body have any info on the wastgate actuator for R32 turbo ive heard it doesnt open til 10psi.

Would it fit in place of the r33 item?

Anybody else done this?

HKS one is cheap enough but im not keen on running 12 - 13psi with standard intercooler/turbo. Plus anymore the 10psi and my engine seems to ping on hot days. Gets to over 40 deg there in Horsham.

Hi Munna

Is this true?

**Yes

Would it fit in place of the r33 item?

**Yes

Anybody else done this?

**Yes, many times

anymore the 10psi and my engine seems to ping on hot days.

**You have a tuning problem, too much ignition advance or too little fuel. I strongly suggest you get it tuned properly.

Hope that helps

Dean: I found that boost drop on the standard turbo was caused by a combination of reduced ignition timing up top (which reduced combustion pressure and exhaust flow) and the turbo being unable to flow any more air because of high back pressure and cylinder back filling at high rpm. The Vg30 exhuast housing with no other mods on the Rb25 turbo held 15psi to redline. I actually locked my wastegate closed and my RB25 turd and it still still didn't hold boost.... hope that helps

Hi Munna

Is this true?

**Yes

Would it fit in place of the r33 item?

**Yes

Anybody else done this?

**Yes, many times

anymore the 10psi and my engine seems to ping on hot days.

**You have a tuning problem, too much ignition advance or too little fuel.  I strongly suggest you get it tuned properly.

Hope that helps

Thanks Sydney Kid one more thing

where can I get one from?

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...