Strange Noise M35 Arx

[andy65b]

3-4k RPM is consistent with max boost.

Sounds like Jetwreck is right.

Highflow time...............

[iamhe77]

  andy65b said:

3-4k RPM is consistent with max boost.

Sounds like Jetwreck is right.

Highflow time...............

Doesn't make sense.

If we all have the same sound, it can't be the stock turbo as I don't have one!!

Wait a minute! Highflow a highflow!?!?!

[Jetwreck]

Description is like the same sound as mind made.....did it for a while then stopped, thats when the rattling started......then there was nothing, not even boost....I could not describe it either at the time(I thought it was the gearbox)......I put the new turbo in, no more rattle and know more strange sound thats hard to explain. Tell me does you turbo seem as though it has multiple boost settings sometimes under full peddle?

P.S. Danny I got 40,000K's out of my turbo from the start of that noise....you will know when you are close as that will be when the rattling sound starts to really irritate you.

Edited May 25, 2009 by Jetwreck

[iamhe77]

  Jetwreck said:

Tell me does you turbo seem as though it has multiple boost settings sometimes under full peddle?

Che?

There are definite rises in boost at 3200rpm and ~3800rpm if that is what you mean, but it does not spike, just holds.

Edited May 25, 2009 by iamhe77

[zei20l]

lol @ che?

mine is smooth all the way to redline........

[iamhe77]

  zei20l said:

lol @ che?

mine is smooth all the way to redline........

So are you telling me you do not have that "surge" at 3200rpm (stock max boost)?

[Jetwreck]

  iamhe77 said:

Che?

There are definite rises in boost at 3200rpm and ~3800rpm if that is what you mean, but it does not spike, just holds.

lol....I know that ....this will not feel right in the way it delivers the power.....can tell you this though, mine no longer makes any strange indescribable sounds. Hey did you go BB or are you still the standard setup just highflowed....maybe you still have a problem with your turbo??....just kidding.......I'm not an expert at sounds I have never heard but his description fits mine exactly. I searched all over the car for the F#$KING sound....even got to the stage that I was going to pull the gearbox out and have it rebuilt.

Edited May 25, 2009 by Jetwreck

[iamhe77]

  Jetwreck said:

lol....I know that ....this will not feel right in the way it deliverers the power.....can tell you this though, mine no longer makes any strange indescribable sounds. Hey did you go BB or are you still the standard setup just highflowed....maybe you still have a problem with your turbo??....just kidding.......I'm not an expert at sounds I have never heard but his description fits mine exactly. I searched all over the car for the F#$KING sound....even got to the stage that I was going to pull the gearbox out and have it rebuilt.

Not BB. Standard setup highflowed.

I have spoken with the guys at RE about it, but have just not had the time to take it in (they are not there on weekends).

Dunno man, sometimes it feels a bit weak (?) whereas other times it blasts through the revs and feel like it could haul an B-double up a mountain.

Maybe the eManage will help...

[iamhe77]

Just been on the phone with the guys that installed my highflow.

They seem to think that it sounds more like something to do with a lack of air getting to the turbo than anything.

Will try to organise a time next week, maybe, to get my car onto their dyno and (hopefully) replicate the sound.

[Vegie1]

+1 for that noise in the 3-4 K rev range.

not always there, but did improve a lot after i serviced the auto.

im convinced that its a slipping clutch pack or simular in the auto.

mine no longer does it unless i really load it up, like 4/5 people in it or a full tank and a heap of gear in the back...

the weird thing is, when the sound appears, giving it more jandel (thong for you aussies), makes it go away. maybe a bit more heat makes it lock up quicker?

mine has the stock turbo, but has had a kakimoto R system fitted, and is running around 14 psi.

[GoldZilla]

Here's one theory that might fit the sound - do you have a paper-element air filter or anything that might flap about or vibrate only at certain revs?

[iamhe77]

  GoldZilla said:

Here's one theory that might fit the sound - do you have a paper-element air filter or anything that might flap about or vibrate only at certain revs?

OE replacement filter (Amsoil Ea) Nick.

Definitely wouldn't be flapping around or vibrating.

[Jetwreck]

  iamhe77 said:

sometimes it feels a bit weak (?) whereas other times it blasts through the revs and feel like it could haul an B-double up a mountain.

Thats what my standard was doing, in fact it was just all over the place. Andy will confirm this story....I was beaten from a set of light one day by a NA Forester....I am still hunting him for a re-run

  iamhe77 said:

They seem to think that it sounds more like something to do with a lack of air getting to the turbo than anything.

That does not make sense....mine is BB, I have no cat, good airfilter, an exhaust system and it does not make that sound(If it's the same sound). My pull from the turbo (although very laggy from standing start....need a transbrake) is in short awesome and violent from about 4,500rpm all the way to the rev limiter and does not drop in any way to the speed limiter(tested on a track ). Not trying to shit you either mate....If you were Ian I would be though!!!.... .

PS. FTG Nissan was were I was broken down in March.....pity I didn't see your car parked around anywhere....would have saved some money in spare parts

[zei20l]

  iamhe77 said:

So are you telling me you do not have that "surge" at 3200rpm (stock max boost)?

of course, its called lag but after that its all smooth sailing...... no pun intended with our boats

[iamhe77]

  Jetwreck said:

My pull from the turbo (although very laggy from standing start....need a transbrake) is in short awesome and violent from about 4,500rpm all the way to the rev limiter and does not drop in any way to the speed limiter(tested on a track ). Not trying to shit you either mate....If you were Ian I would be though!!!.... .

PS. FTG Nissan was were I was broken down in March.....pity I didn't see your car parked around anywhere....would have saved some money in spare parts

4,500? Seems a bit laggy for me mate. Give me 1bar from 3700-3800 with no tapering off to redline.

What were you doing near FTG Nissan? I thought you broke down on the way back from Phillip Island??

Yeah I agree, could've saved a bit of money on parts - namely that pretty little powerduct you got there

(would've looked at your springs, but I got my suspension coming soon)

Back on topic

It sounded to me as if there is a slight blockage in the oil line to the turbo which clears pretty quickly (when the noise goes), but I am told that the turbo would seize almost instantly if this were the case.

Or could it be a bit of vibration from the turbo?

Edited May 26, 2009 by iamhe77

[[[d a n n y]]]

nah it's no rattle noise..

it's a grinding noise..

like a heavy chair grinding against a wooden floor but as long as im in 3-4K rpm itll just make that noise..longer i keep it half throttle the longer the noise..

it's a very dull sound...

i doubt it's turbo...

i know how stuffed compressors wheels sound like..

[dozzer]

Hey, i know its been a while since this was talked about, but, did anyone fix this strange noise without changing the turbo???

My rx is doing the same thing. I thought it was an exhaust leak but now ive changed the exhaust and noise still persists!!

I find that accelerating up up hills is when it happens most.

[Jetwreck]

  dozzer said:

Hey, i know its been a while since this was talked about, but, did anyone fix this strange noise without changing the turbo???

My rx is doing the same thing. I thought it was an exhaust leak but now ive changed the exhaust and noise still persists!!

I find that accelerating up up hills is when it happens most.

Ended up being the turbo....complete rebuild.

[dozzer]

  Jetwreck said:

Ended up being the turbo....complete rebuild.

Did this noise occur every time you took it in the 3-4k rev range or did it only happen on occasion??

It just seems weird with mine because sometimes it boosts nicely all the way through and other times it doesnt

Do you think it could be something in the gear box or possiblly a worn yoke in the tailshaft vibrating???

[Jetwreck]

  dozzer said:

Did this noise occur every time you took it in the 3-4k rev range or did it only happen on occasion??

It just seems weird with mine because sometimes it boosts nicely all the way through and other times it doesnt

Do you think it could be something in the gear box or possiblly a worn yoke in the tailshaft vibrating???

Yes thats the rev range......the reason it works sometimes and not others is because it is binding up. It feels like you have 2 boost settings does it not?