Jump to content
SAU Community

Recommended Posts

got a stock RB to go in my 180 and also have a stock rb25 turbo. Can i just bolt it on and boost away. Or am i going to need to get a tune, custom ecu, remapped ecu???

Also, what sort of power gain am i going to get with a RB25 turbo and 3inch exhaust, and what is an RB20's stock power output at the wheels anyway??????....... thanks

Link to comment
https://www.sau.com.au/forums/topic/176854-rb25-turbo-on-stock-rb20/
Share on other sites

it wont muck up fuel economy, and you will notice an increase in power but you wont get the full benefit untill it is tuned, to give you an idea my car was making 135rwkw at 10psi with the rb25 turbo then tuned it and at the same boost i made 150rwkw and then 180 with 13psi, it is a good cheap upgrade for the rb20

thanks, guess i will be getting a tune pretty much straight away then, was considering up grading my ecu at the same time, most likly to a link systems one.

Is this a good idea for early mods?? is it going to give me much more power?? cheers

It is definitely a great mod. The rb20 should have came out with the rb25 turbo.

It gives a fair bit more power, fair bit more torque, without much extra lag. Not to mention they're newer and in better condition.

Just to give you a rough idea, the rb25 turbo supposedly flows about 25% more than the rb20 turbo (that's what sydneykid says)

Its deffinately worth the upgrade. As stated the gains r there on 10psi, use the actuator from ur stock turbo and the 25 turbo otherwise u'll run about 6psi. I have the older RB20DET ECCS in an HR31 and with pod, 3 inch exhaust and 33 turbo I was making 130rwkw also, with the SAFC tuned and a Bosch 040 pump to be safe it went up to 152rwkw. Save ur cash and get ur RB20 ecu remapped.

Liam

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

    • So I'll put filler past the repair area a bit to make sure I don't miss anything. Then I'll block it until it's almost level, put the guidecoat, then keep blocking until it's gone. Then it's still wavy.  In regards to hitting the panel, I saw this video might give more context - Skip to 0:47 he knocks it down. But yeah I'm sanding until the guidecoat is gone then checking because otherwise my filler is still well above the bodyline. Unless what you're saying is I should put guidecoat around it early, surrounding the filler then stip once it's gone?
    • I refreshed the OEM injectors with the kit and connected it up. It now ideals okay even with the IACV removed. Driving still has the same cutoff issue like the 550cc injectors so the issue is somewhere else. I bought FPG's Fuel Pump Hanger. I will be installing it next, but it is not as straightforward as I thought it was with my limited wiring knowledge and no instruction on the specific model I purchased (FPG-089). I also got the incorrect billet clamp as I could not find info on the OEM sizing.
    • Stop looking at the garage floor, and turn the radio up a bit louder if there's any strange noises...
    • No. Turbo shuffle and surge/flutter are not the same thing. Specifically, on a GTR, turbo shuffle has a definite meaning. On a GTR, the twin turbos are assumed to be the same thing and to operate the same way, exactly. In reality, they do not. Their exhaust sides are fed and exhaust a little differently, to each other. Their inlet sides are fed and exhausted a little differently, to each other. Consequently, when they are "working" they are often at slightly different points on the compressor map compared to each other. What this means, particularly when coming on boost, is that one of them will spool up and start producing extra flow compared to the other, which will put back pressure on that other compressor, which will push the operating point on that other compressor up (vertically). This will generally result in it bumping up against the surge line on the map, but even if it doesn't, it upsets the compressor and you get this surging shuffle back and forth between them That is "turbo shuffle" on a GTR. It is related to other flutter effects heard on other turbo systems, but it is a particular feature of the somewhat crappy outlet piping arrangement on RB26s. There are plenty of mods that have been attempted with varying levels of success. People have ground out and/or welded more material into the twin turbo pipe to try to prevent it. Extending the divider inside it works, removing material doesn't. There are aftermarket replacement twin turbo pipes available, and these exist pretty mush purely because of this shuffle problem.
    • You can temporarily* use lock collars to keep it in place until you can do the bushes, back the nuts off, slide them in, snug back up. *temporarily is often for ever
×
×
  • Create New...