RB making odd sound, with video..

[Rezlo]

http://www.rezlo.com/Pages/Toys/Silvia/rb/Vid/Funny%20sound.AVI <- click

Sounds like a band saw almost as soon as i boost over .7bar,

Its definatly on the intake side, checked everthing for leaks and its not my BOV because thats plumb back on the turbo side,

Any idea's?

[punxva]

it's really hard to tell what it is in the video, is there any way you could make one thats a little bit clearer sounding?

[Rezlo]

you can hear it quite easily, almost sounds like a warning buzzer when i boost ;)

I will try get more vid tommorow when the sun comes up,

[drift freaq]

ya I could not get much out of the video sound wise.Nothing sounded abnormal but the sound quality was horrid. Oh ya in case your wondering the RB has quite a howl under boost and revs. There are a lot of Ferrari's in my area and my car has been likened to sounding like a Ferrari under hard boost going up the street.
OK I went back and turned the volume up high, I heard what your talking about. I have no idea what it is. What is your underhood setup. I.E. stock blowoff? aftermarket? stock actuator? boost controller? Something could be vibrating loose on your setup under upper revs and boost and hitting something in your exhaust or downpipe setup.
We are here you are there. There is only so much we are going to deduce over the net. I would be out looking at everything underhood and whatnot to isolate this issue

[Rezlo]

Definatly from the intake region, starts making the sound over .7 bar in any gear, almost sounds like a gasket leak, but it isnt.

I was thinking maybe its one of the sensors but it doesnt seem like it, only thing i can think to do is get it on a dyno and check, but the dyno's in South Africa dont like any cars that make semi decent power.

Little list of things:
GT3040
Tial gate
Greddy RS plumb back bov
and pretty much everything else i made myself,

Greddy intake manifold arrives soon, hope fully its somthing in the old manifold that has the problem.

Here are some pics:
http://www.rezlo.com/Pages/Toys/Silvia/rb/Front%20(Medium).JPG
http://www.rezlo.com/Pages/Toys/Silvia/rb/Side%20(Medium).JPG
http://www.rezlo.com/Pages/Toys/Silvia/rb/Side2%20(Medium).JPG

[Rezlo]

well went over every hose that hooks to it, tightend up the bov, checked everything else, and it all looks good.

I think i must just wait for my greddy manifold to arrive and take it from there :(

[drift freaq]

By the way, thats interesting how you modded the stock intake manifold. Supposedly according to the guys in Australia the stock manny gets really great HP results, in comparision to the aftermarket ones.

[LB.Motoring]

yah we have modded one just like that, and another using only the lower portion cut short and custom the rest for responce.

http://i5.photobucket.com/albums/y193/Drift3rx240sx/Limit%20Break/DSC00002.jpg

[MELLO*SOS]

:werd: I was just going to comment on that; your intake manifold looks good. That's how it should have came stock... Do you have any more pictures or details on what you did there? Looks like you welded a TB flange onto the front and chopped & sealed the original opening... Anything else?

I tried listening to your video but it was really hard to hear anything. Maybe you can make another video?

gl

[Rezlo]

By the way, thats interesting how you modded the stock intake manifold. Supposedly according to the guys in Australia the stock manny gets really great HP results, in comparision to the aftermarket ones.
Hope this isnt the case because ive ordered a greddy intake mani :) though i do plan to run pretty high boost levels soon.

Yeah i pretty much just cut the TB off the side and cut the front off and welded it on, had to add a nipple for the crank case ventilation but that was simple,

Here are some more pics:
http://www.rezlo.com/Pages/Toys/Silvia/rb/RBd8pic2.JPG
http://www.rezlo.com/Pages/Toys/Silvia/rb/PICT3424%20(Medium).JPG
http://www.rezlo.com/Pages/Toys/Silvia/rb/PICT3422%20(Medium).JPG

[eh?]

Do you have a boost guage? That would really help troubleshooting a leak. Also do you have a SS autochrome exhuats manifold? There have been cases where the head flange straight and level causing an exhaust leak..

There are pretty big gains with the greddy IM, I know some went from ~245whp with just an aem ems/8psi to ~310whp with full exhaust/fmic/greddy im/8psi. You will need a standalone to up the low end timing though.

[Rezlo]

im going with the power FC, its not an SSAC manifold, but its similar, its definatly from the intake side, only when i go over .7bar (my car looks 100% stock so i use the profec B to watch boost)

I think im going to have to get it on a dyno and check it :(

[MELLO*SOS]

Thanks for the pictures, looks like you flipped the TB for clearance issues?

[Rezlo]

Yeah but it wasnt for clearance, my car is a RHD so the throttle cable is to short to get to the other side :)

Rezlo=Getto

[Rezlo]

http://www.rezlo.com/Pages/Toys/Silvia/rb/Movie1.wmv

There we go

[MELLO*SOS]

Much better video...

What an odd sound? Sorry I have no idea, maybe someone else here will recognize it.

[Rezlo]

I can hear it perfectly, especialy the first 1/2 of the clip, sounds like one of those band saws they use at butcheries, only under boost.

It must be somthing in the stock manifold or one of its sensors around it.

Im going to remove it all tommorrow and check.

[drift freaq]

There are pretty big gains with the greddy IM, I know some went from ~245whp with just an aem ems/8psi to ~310whp with full exhaust/fmic/greddy im/8psi. You will need a standalone to up the low end timing though.
Going to a FMIC with bigger exhaust would definitely help in the HP. Though I seriously question that the HP gain was from the Intake.
I would want to see dyno sheets before and after to back up that claim and you would be surprised by what tuning and a little boost increase can do.
I have a Greddy Intake and I aslo read the Australian Skyline forums. No one has ever reported big HP gains from the Greddy intake in fact its been the opposite. People have noticed a loss of bottom end power and on equally setup up cars have seen the same numbers off a stock manifold setup vs the Greddy. Its a known fact that the Greddy is pretty much an esthetic upgrade that just cleans stuff up.

[eh?]

Rezol:
I had a turbo going bad make that sound. Where did you get the turbo from?

Drift
Going off topic, should make another thread about the Greddy IM. But no- I cannot produce a before and after from the same car. The guy was the test car for aem, has his own store that sells RB parts (BNE custom) and I've sold parts to him. So to me he's reliable, maybe not to others.

The car ran the same boost, yes timing will play a factor but how much? In my opinion the Greddy allows you to add timing up top. Because of that gains may not be realized with a stock ecu (my opinion).
The Greddy does in fact produce a loss of bottom end power. True, but like I said you must tune the low end timing. You have a Greddy and a PFC go a head a try it.

[Rezlo]

I buy alot of stuff from BNE customs, good guys, he told me about the awsome gains when fitting the AEM and tunning,

Its a GT3040 from Eric, has the correct built in oil restrictor and all that, oil return is 100% fine to. The turbo is near brand new, car only has 1000miles on it odd and its been doing it from the get go, I highly doubt its the turbo, it definatly sounds to be coming from the intake side, looks like i might be able to get it in the dyno tommorow to get a proper listen to it with the hood open

[eh?]

Maybe it's just the sound those front facing stock IM's make?

[Rezlo]

I doubt the manifold would be making the noise, non of the other ones ive done have, especialy considering its a straight shot in with zero restriction.

Once ive done my next oil change ill crank the boost up a little with some race fuel and see if it changes anything.

[Captain_Impossible]

Have you considered that the BOV may be leaking? Sounds to me like air whistling or metal scraping at a really high speed. My guess would be bad turbo or a leak somewhere.

[Rezlo]

Well,
I put a Nismo fuel regulator in, adjusted it correctly, I cranked the boost up a bit (to .9bar) Then worked out just how fussy these RB's are on A/F, we normaly run our SR20's as low as 11.2 but this RB will just not pull nice unless its spot on 12.5, any richer and it just bog's down, got me going side ways nicely just coming into boost in 2nd with 235wire tires.

Took the manifold off while i was working around the fuel regulator and nothing is wrong there, I think it might be a leak right out the back of the turbine housing where the 4 bolt flange meets it, or the bov, will pop the Greddy RS off and plug the intake and run it atmospheric and see if it changes the sound.

Ahh the fun of trying to do trial and error with a semi fast car :(

[ViZion Zs]

its the death whine from the turbo.. i know that sound from rx7s.

[Rezlo]

better bloody not be, its a brand new GT3040

Just took the plumb back Greddy RS off and put a knock off type S on and it still does the exact same thing besides sounding very intertaining and scaring kids off the streets when i change gears.

[Rezlo]

http://rezlo.com/Pages/Toys/Silvia/rb/Vid/Rezlo's%20RB2.wmv

There we go,,, Doesnt sound like a turbo, it's frequency doesnt change threw higher rpm's and different boost level's... sorry about the semi poor driving, hard to hold a camera, drive and change gears while trying to watch the road...

Ill go beat the dyno guy up tommorow if he doesnt let me on to check where the hell its coming from.

[Rezlo]

Well after stripping near everything with no change i hooked up a high flow compressor (1" ID air line) and pressurised my whole system and found the leak very fast.

My one boot coming out the intercooler I couldnt get from my one chinese silicon supplier (temp out of stock) so I braught in one from the US at 16 times the price, It was from one of the very reputable silicon retailers, it has 9 pin hole leaks in it, it only leaks when presurised to over 8psi, replaced it with my now instock chinese silicon reducer and noise gone :)

VERY VERY happy !!!!