Torques

Thanks for pointing this out. I will resolder/rewire the Z32ECU this weekend and dive into the abyss of Nistune I will definitely have questions!

Nooooooooooo! 350 at the rear is what I think would be the target for my car as a 'project' I will need a new turbo, injectors, pump etc.

I am glad we have sorted this out .. I was quite sceptical about the posts saying the turbo can deliver 20PSI+ on the RB25 but did not have enough hard facts to make my statement. Now with that independent other dyno and mine as a comparison there is not much room for speculation. The RB25-Turbo simply can not deliver that kind of airflow/boost (and it would have surprised me if it could) The universe is sound again ..

AMEN!

Yep ... but as per lower post the RB25 eats up more air (higher flow rate), so it's even harder for the RB25 Turbo to keep up on the larger engine. So I have no boost leak, my boost controller is fine, and setting higher values than 13-14 PSI does not do anything since the Turbo is running out of its efficiency range. Clearly: It's all in the dyno graphs! Cheers, Andrew

This Dyno finally answers my question (The question this thread was initially about) As you can see from the 2 boost curves in the picture, the turbo is running out of steam at 14-145PSI. While at the slightly lower boost level the pressure is more or less constant, at 14+PSI the boost eases off gradually. See my own attached dyno and compare to the one in this post. Don't get confused about the 300HP figure, it's calculated from rear wheel power. Conclusion: The standard turbo can not sustain boost over 15 PSI.

LOL, This has really become a fun thread. I like -> 'He is from England' But ... I am half German, so only interested in real and precise numbers. I don't know about the inherent formula to calculate 'clutch hp' but it can not be too far off from the truth. Anyhow, I am aiming at HP 350+ at the rear and hope Nistune was a good investment to eventually get me there. Cheers from the land of clutchpower, Andrew Here are some pictures from last weekend: Jap Event

OK ... good point.

Hi! Thanks for pointing this out ... But it is definitely is not 300 rear wheel. At the Dyno they first plotted the higher figure, I guess to impress customers. Here's (attached) what they said it is RWHP (I wish I had 300 at the rear)

Hi there, I 'know' about the power because of the Dyno .. the 300 figures is obviously calculated. (It's 250HP rear wheel)

Hi! Thanks .. Nistune Z32 ECU + AFM is here for the rescue. I have no idea how R&R feels ... I thought it would be kinda smoother effect. (It feels like the ECU is actually shutting down the whole engine for a moment)

Hello there, I am running R33 GTSTS2 with 14PSI of boost. I am using the standard ECU, not retune has been done. (But Nistune + Z32 ECU will be installed soon) At current the car is making 300HP at the cluch. However there is a bit of a strange behaviour. Sometime when I floor it rapidly it feels as if the engine has been shut down for a few seconds. It's quite violent, but no misfires or stuttering. Then after a second or so the engine comes back to life and everything is back to normal (I have to ease off the pedal though) In contrast when I floor the pedal a bit more sensitive everything is fine. For example I can go to top speed with no problem whatsoever .. Is this R&R?

After all the gloomy replies and off-topic posts this is an uplifting story I can literally see you in your Skyline with the boost over 15PSI and not thinking a moment about destroying the turbo. Yes, ignorance is bliss and for some reason not every R33 turbo explodes if taken to new levels. Cheers ...

Guys, it is working now as designed ... smooth. Anyhow, enjoy watching.

Hi ... Thanks You are right! There seems to be an issue with the provider ... The video normally starts after 1-2 seconds and it is very smooth! Please try again later! Here (in London) it is very slow as well. Sorry about that

Sorry mate .. Sucks and Shit? User Error! The page is perfectly alright. Get your system/browser up to date. For Netscape/FireFox you need a plug-in since the content is based on windows media. There is a note about this on top of the page! Or use Internet Explorer!

Hi there, Interesting read .. and the discussion went quite broad As for damaged standard turbos, have a look at my signature .. It's actually a link to some videos. Click on the second video from the top titled 'Suspension, PowerFC, New Turbo' There's a good coverage of what is likely to happen to the turbo. Cheers, Andrew

Hi guys, Thanks for all the answers ... I was thinking that the turbo was maxing out since I could not get the boost over 14PSI / 1 BAR (around 7+ on the internal boost meter) Background: I am running this turbo on 13PSI (in High Mode of my boost controller) Yesterday I was at this event here in England where you can do the quarter mile. Some pictures if you like -> Santa Pod Just for the fun of it I tried setting the boost to 1.2BAR, but the boost would never go any higher than roughly 13-14PSI, no matter what. My conclusion was that the turbo was maxing out. Very strange ..

Hi there, I was wondering how much boost the R33S2 turbo can actually deliver if being maxed out? As an experiment I set my boost controller to 1.2 bar, but the boost would never go over .9 - 1 bar. Could it be that the turbine has reached it's mechanical capacity at this level and is actually maxing out? And yes ... I know the turbine is not going to last long with this kind of boost. (it was just a test) Cheers, Andrew

Hello Yes, factory ... The thing is that I really like the design of the genuine muffler with the 2 tips. And I could not find a performance exhaust that had a similar design. So I am planning on building my own system I want to modify the standard muffler, changing the 2 pipes (from the muffler) into a larger diameter. By 'changing' I mean cutting the muffler open and change the internals. Used mufflers are cheap (who wants them..?) and I have the time and equipment to give it a try. (Probably a silly idea ..) Cheers from London, Andrew

Hi there .. Is the R34 exhaust system any larger in diameter? (compared to the R33GTST?) Would the muffler fit my R33? Thanks ...

Hello there, Just a question regarding the R34 CAT: Is the R34 CAT any bigger compared to the R33 GTST one? Would The R34 GTT CAT fit (with minor modifications) my R33 GTST S2? Thanks ...

Hi! I wouldn't say that the R34SMIC is not much better. It's clearly not as big as a FMIC but depending on your setup it's a good alternative to the standard R33 SMIC. R34 vs R33

Hi there from the UK Here's my first run ever ... 1998 GTSTS2 Standard exhaust Standard intake system R34 FMIC HKS EVC3 Standard Turbo @ 1bar (14 psi) Standard low octane fuel. 300HP 224KW at clutch 248HP 189KW at rear wheels

Hi there ... I see that you have a digital odometer. This is not the case with my R33 (1998) I could adjust the odometer, but it was a bit of a puzzle. Here it is (I changed the bulbs to LEDs):