Rb Turbos Induction Noise

[TTT]

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.

[paulr33]

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

[Cubes]

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.

[LatinR33]

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

<{POST_SNAPBACK}>

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.

[TTT]

I believe the second line of my post says "even with the stock air box in"

Cubes - Thanks for that.

I guess it could be that.. Since you've seen both and have compared them.

cheers

[benl1981]

I dont find mine very loud with high flow panel and air box. Maybe somebody has taken the lining out or something

[Cubes]

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!]

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...

[TTT]

yeh stock bov.. and yes it makes a difference when on part throttle when the bov is slightly open but it doesn't make any difference to mine with either bov when foot to the floor.

same induction noise.

I guess I'll wait till the future build up

[AMS]

Yeah I have stock airbox, panel filter etc. But damn does it spool loud! I can see what you mean! But I love it

[Cubes]

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.

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]

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.

[Cubes]

Its been quite a year.

If your only going a gt30 stick with a stock rb30, dont bother with forged rods or pistons.

[TTT]

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.

[Cubes]

Awesome.. GTS4

Make use of the first 2 gears, the rb30's torque really tries to chew up the tyres within the first 2 gears. Not good for rwd.

Just watch that third gear.

[1400r]

anyone know how to make it sound louder my 2530 is heaps quiet running 1.1 bar Ive got a KN pod? and stock bov?

[TTT]

swap your quiet crappy turbo for my superior factory ball bearing LOUD spooling unit.

I won't even charge ya cause I'm in a good mood today.

[Evil]

mine is quite loud even with the stock airbox (K&N filter though)... i don't have the snorkel on either which might make it louder... but i like the sound...

[benl1981]

GTST will you put new rings and bearings in etc? Sorry to deviate...

[TTT]

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.