Jump to content
SAU Community

Recommended Posts

Ive got an R33 with the stock turbo on the RB25DET

Now ive heard different stories so it seems the amount of boost the stock turbo is debatable.

I recently installed an R34 SMIC on my car and was wondering what PSI i could comfortably run the stock turbo at? Without risk of damaging it or any other parts.

Im wanting to crank it up to at least 10 PSI, but 11 or 12 would be better, is this possible? Has anyone else done this and what was the result? And how good is the stock turbo?

Link to comment
https://www.sau.com.au/forums/topic/299581-rb25det-stock-turbo-capability/
Share on other sites

i have the r33 series 2 turbo on my r32 gtst and i run 15psi high boost and it hasnt faulted me but low boost is set to 10psi what usually gets drivin round on but i think with the African American engine u should stay 12 max!

holy shit i just said the african american engine hahahahahahaha trippin... was ment to say witth the bigger engine should stay 12 psi max

^^ lol WTF haha

Anyway I rann 14psi on mine.....and it eventually snapped the shaft so i would be keeping it at around 12psi too, it starts to make more het than power after then anyway as it is well and truly starting to run out of puff

I run 12 PSI on stock ECU & catback with no issues so far (6 months), 150rwkw on a mainline dyno.

But anything above stock be prepared you are taking a risk, stock 33 turbos can be picked up sub $400 if you do pop one though.

I'm on a budget but have similar setup

running 10psi with no dramas on r33 with catback and r34 smic

next step is dump, fuel pump and safcii

12psi should be fine as long as your not doing circuit work,

eg constantly on boost. Occasional blat like on public roads

won't get ur egt's that high

interested in results rb25 owners have from vg30 steel

wheel turbos. Seem to go cheap and bit tougher

Sorry, i didn't mention, i have fully replaced the exhaust system, including the dump pipe. Had it custom made 3inches all the way back.

Im running it at 10 PSI and it seems to be working fine, but with this set up you guys reckon dont push it past 12? until i get an aftermarket ECU?

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

    • Haha luckily we don't have emissions, inspections, or any laws against power adders here. They only thing they somewhat keep an eye out for are ridiculously loud exhausts. 
    • Just wanted to pop in an update on my setup. The CD swap has been great, I love the mazworks housing for the overall simplicity. I ended up sealing my trans tunnel with a thin sheet of aluminum reused some of the holes on the trans tunnel, and laid some window sealing EPS foam around the edges. Works great, really quieted things down and sealed up the car.  As for the power comment. Right now I am also running about 650whp. with the way the bell housing is attached to the face of the transmission I have zero doubts it would be fine, mainly because the input shaft and main shaft bearings are seated into the bell housing adapter. This means the load is NOT on the bolts to maintain the power, rather into he casing of the bell housing; Yes the bolts are doing some work there, but with both shafts locked in zero worries.  End of the day, the Mazworks solution is the easiest and safest. no need to take your trans to a shop to get milled perfectly, it fits with minimal clearancing, and you can use all your existing clutch and flywheel.  Driving wise the CD has been great compared to the big box, I'll probably swap my final drive at some point. The serial 9 shifter is gooooood, my only qualm is how tight it is, it takes a fair bit to get use to, 5th and 6th are a bit eh/hard to find at times, but maybe I need re-adjusting, and I think my clutch master is very tired and needs a rebuild. 
    • If you are keen, have a look at my build thread. Car is for sale for the right money or straight swap for a F80 M3 LCI.
    • Welcome mate.  No point in over thinking it, buying any one of those cars you mentioned is not a smart or logical choice with the availability of many "better" (re price to performance) cars available to you.  The heart wants what the heart wants, buy whatever it leads you too.
    • Hey everyone! Im so grateful to be apart of this community and ill do my best to be apart of this. Firstly, i'm not disclosing my real name due to in real life circumstances surrounding my privacy and public image (sorry lol) Secondly, The only thing personal I am willing to share is that I'm from Sydney and a descendant of one of Sydneys largest mortgage firms. I got gifted my first ever car, a 2022 Porsche Cayenne and I love it to death. Ive been driving it for about 5 or 6 months now and honestly Im so grateful for my parents for gifting me this vehicle. However recently I've been working my ass off to afford my second car (which I need help deciding soooooo community help me out please?). Once decided, im planning to try modify it myself. Recent I've been thinking about getting a Skyline, particularly a 25GT or GT-V, yes I know overrated as hell, but I'm also considering a Chaser which I recently came to love. However my dream is to one day own a 180SX (So hard to find clean versions and im not really into importing).  Lastly before I send this off, I want to apologize if I sound tacky or pretentious. I try not to and want to genuinely learn from everyone and anyone. (Im no expert in this area) Thanks for reading!
×
×
  • Create New...