Jump to content
SAU Community

Recommended Posts

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

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:

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.

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.

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...

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.

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:

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.

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


  • Similar Content

  • Latest Posts

    • The hot exhaust light will come on not from just the cat being blocked, but it's just a temp sensor, and it's designed to warn you to not do things like park in long grass.   If you've been pushing the motor a bit, it can cause the light to come on.   Second if the cat is rattling, I'd suspect it's not blocked, but instead falling apart inside.   The easiest "fix" until you can get a cat put back in, is to unbolt your one, bash the rest of the insides out, and then bolt it back in.   For a daily driver/street car, I am in agreeance of put a cat in the car. If it were race car I wouldn't care if it were removed.
    • No worries at all 🫡 I think the most satisfying things to make are the little bits that are just impossible to find or they're no longer manufactured. Generally I always try to replace parts with OEM wherever possible. This little project is also great because it'll never see the light of day, but strengthen these brackets so it's not just relying on the little standard screws in the headlight plastic. As soon as I saw the standard brackets and screws I thought, "well I'm not going to install with just the screws, the plastic tabs will just snap off". It's crazy how expensive everything has become yeah. But I suppose that's supply and demand; granted it's a lot easier to get brand new genuine parts these days which is fantastic 😊, I don't have to get totally reamed at the local Nissan dealer ha ha We sure are lucky we have all these manufacturers making parts these days, a few really great Australian companies too like Platinum Racing Products and Fit Mint Automotive, what a time to be alive ❤️ . I've got my eye on the RB26 head by PRP as mine has a very fine hairline crack, so that'll need to be addressed some time in the future. If you have any requests or odd things to make feel free to let me know and I can have a crack at making replacement parts ✌️
    • Thanks for sharing this, and BTW if your headlights are in good condition they are worth thousands....you might want to consider replacing them with brand new LED ones like this (https://www.nengun.com/78works/full-led-headlights-r32-skyline) and making enough profit to buy a house in Sydney
    • I'm not sure what sort of shops are nearby, but I'd expect any reasonable exhaust shop could put a cat in it that will not restrict the power that engine makes. Otherwise, if you want to remove it, short lengths that replace the cat are readily available online, search for "de-cat pipes" or "test pipes"  
    • Howdy friends, So another weird one today, I was looking into replacing some broken clips holding the front grille for the R32 GTR (part number 01553-03831), and noticed the brackets which are supposed to hold the grille in place were also missing 😑. I do recall seeing this issue many years ago, but didn't fix it at the time. A quick look on eBay and I was able to find the genuine brackets, along with all the screws which suited the headlights (part numbers 26042-08U05,26092-08U05). Happy days!....  Once they arrived however there was an extra nut in the packaging which implied that there should also be a bolt or a stud, and sure enough, after a bit of searching I found this thread from 2013, and @Ants clearly shows a stud should be present. Reading around a bit more, it's possible the headlights on my car are the "povo pack" headlights as mentioned by @funkymonkey in this thread way back in 2008. This could explain why the studs are missing on my set of headlights. Looking at the headlight diagram I wasn't able to see a suitable part number for the stud itself. The headlight did indeed have a recess that looked like it would accept a stud, but interestingly no thread or anything obvious how the stud would be affixed to the headlight, I suspect it may have been glued in, press fit, or melted into the plastic at the factory. Another member may be able to clarify if they happen to have a genuine set of N1 headlamps. The only thing we have to work with within the recess is a keyway which likely is there to prevent the stud from rotating within the recess. In any case, back to 3D printing, I put together a model which acts like a pug with a friction fit inside this recess, making use of the keyway so it doesn't rotate while tightening a bolt. Printing in TPU will allow it to slightly swell making a nice snug fit without cracking the part. I've designed the adaptor it to accept an 20 mm M6 bolt (stainless with a cap head in my case), as opposed to the standard M5 stud and I made use of the standard galvanised split washer that came with the genuine brackets from Nissan. Once the bolt and screws were all in place, giving the bracket a gentle shake gave the classic "shaking the car" feeling, very solid, which gives me confidence this is going to be able to hold on much better than the janky solution which seems to have been here for the past decade or so. Overall I'm really pleased with how this turned out and maybe there are more people out there running these headlights without a centre stud at all! Link to the freely available model on Printables: Click here Regards, Sean  
×
×
  • Create New...