Jump to content
SAU Community

Rb Turbos Induction Noise

TTT

By TTT,
in Engines & Forced Induction

 Share

Recommended Posts

TTT Grand Master

TTT

Posted
Posted

What is it about the stock turbo's on RB20/25's that make the induction sound so loud.

even with the stock air box in.?

I'm sick of it already.

Is it something with the design in the wheels or maybe the compressor inlet?

my SR was never this loud.

neither was the 4G63.

and no, there is no leaks or gasket issues.

it's just the standard skyline turbo sucking sound.

Link to comment
https://www.sau.com.au/forums/topic/101348-rb-turbos-induction-noise/
Share on other sites
Cubes Grand Master

Cubes

Posted
Posted

The VG30DEt turbo is much quieter... No loud whooshing as it comes on boost yet it runs the same core (comp and turbine wheels) as the rb20det turbo only larger turbine and compressor housing. The other difference is the compressor housing snout is smooth in to the compressor, the rb20 and rb25 turbo's have a slight step in front of the compressor wheel. I assume this causes a little turbulence causing the loud whoosh noise as its building boost. :unsure:

LatinR33 Experienced

LatinR33

Posted
Posted
fit an airbox with a panel filter, that will shut it up

This is true,just make sure the sponge stuff on the lid is on if you want to reduce induction noise take it off and it increases the sound surprisingly.

Cubes Grand Master

Cubes

Posted
Posted

GTST,

The VG30DET turbo and the Rb25 turbo run the same sized comp cover, the only differece once again being the vg30 is smooth where as the rb25 has a step up. The Rb25 turbo is a noisy bugger like the rb20 turbo. I am 99% sure its this little step in front of the comp wheel that causes the noise.

Mr Italy! Proficient

Mr Italy!

Posted
Posted

Do you have the stock BOV fitted?

For some reason on both mine and a mates GTS-T, when we had the Stock BOV working it makes a much different and louder aray of sounds when its spooling.

When the aftermarket item went back on and the stock one was blocked off, less sound during spool up...

Cubes Grand Master

Cubes

Posted
Posted

I run the stock bov.

The VG30DET turbo is so much damn quieter than the rb20 and rb25 turbo's. It HAs to be the step in the turbo's intake. :unsure:

If you block off the little bleed hole in the stock bov it also makes spool rather quiet, I experienced roughly part throttle acceleration through the hills so I removed screw I used to block the bov's bleed hole.

TTT Grand Master

TTT

Posted
  • Author
Posted

I blocked off the bleed hole on my last skyline.

but like you said, it's not a smooth transition between on and off throttle or part throttle.

so I'm leaving this one as is.

I'll have to put up with it for a while as is.

once I settle in to QLD, and everything is back to normal and bank account is a little beefier, THEN, I can build the RB30 that I want and stick the gt30 to the side of it.

I hate having it all planned out and no funds to make it happen.

NOTE TO MEN: Don't pay for your own wedding.

oh and don't have your UNINSURED car stolen.

oh oh.. and don't do all of the above when paying a MORTGAGE.

Lets hope 2006 brings better luck than 2005.

:unsure:

TTT Grand Master

TTT

Posted
  • Author
Posted

the only new part to this engine build will be bearings, turbo, sump adapter, idler pulleys and timing belt and ECU

bottom end will be stock.

just checked and tested.

and I will use the pistons it came with.

head will be stock with second hand 25det springs to be sure.

oil pump, second hand.

injectors I will get GTR ones.

B

U

D

G

E

T

We'll see how long the gts4 box holds up.

and I will only have it tuned with 14-17psi... don't want to really go over 1bar.

what ever power that yields is cool with me.

TTT Grand Master

TTT

Posted
  • Author
Posted

yep.. new rings, bearings, and new gaskets.

all parts will be OEM nissan/holden bits.

I just want it to be reliable.

so I will replace parts that are required.

nothing forged though.

I don't think it will be required for my needs.

I should also add oil cooler kit to my list of NEW things to buy.

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • The Bogan
      NC MX5

      By The Bogan · Posted

      Version 1 aluminium airbox is.......not acceptable No pics as I "didn't like the look.....alot" Even after all my "CAD", and measurements, the leg near the fusebox just didn't sit right as it ended up about 10mm long and made the angle of the dangle look wrong, the height was a little short as well, meh, I wasn't that confident that Version 1 was going to be an instant winner I might give Version 2 another go, there's plenty of aluminium at work, but, after having in on and off a few times, and laying in the old OEM airbox without the new pod filter and MAF, there may be an option to modify the OEM air box and still use the Autoexe front cover and filter.... maybe This >  Needs to fit in here, but using the panel, and not the pod, the MAF will need to fit in the airbox though> I'm thinking as the old OEM box and Autoexe cover that is sitting in the shed is just sitting around doing nothing, and they are relatively abundant and cheap to replace if I mess it up and need another, it may well fit with some modifications to how the Autoexe brackets mounts to the rad support, and some dremiling to move it get in there, should give me some more room for activities, as I don't want to move the MAF and affect the tune Sealing the hole it requires to stick it in the air box is simple, a tight fit and some pinch weld will seal it up tight  I am calling this a later problem though
    • Dose Pipe Sutututu
      Ethanol Content Sensor - Always at 11%?

      By Dose Pipe Sutututu · Posted

      and it ends up being already priced in as though you're just on 91RON without any ethanol. Car will lose a bit of economy as the short and long term fuel trims bring down the AFR back to stoich or whatever it is for cruise/idle for the engine.  
    • soviet_merlin
      Ethanol Content Sensor - Always at 11%?

      By soviet_merlin · Posted

      Oh, you are right. But, in Australia E10 is based on 91RON fuel and ends up being 94RON. Hence it being the cheaper option for economy cars. The more performance oriented cars go for the 98RON fuel that has no ethanol mixed in. The only step up we have left then at some petrol stations is E85.
    • niZmO_Man
      Lock up the old for sale / wtb threads.

      By niZmO_Man · Posted

      There is a warning that "this thread is super old" but they ignore that anyway...
    • TurboTapin
      Ethanol Content Sensor - Always at 11%?

      By TurboTapin · Posted

      With 10% Ethanol, we're talking 2-3% fuel consumption difference. The emissions reductions and octane boost in my opinion far outweigh this almost non existent loss.    My tanks sitting at 80%. Luckily that should go down fast as I'm on vacation again for the next two weeks. 
×
×
  • Create New...