Whistling/whining noise when accelerating?

[LeeHammy]

I have recently noticed this noise. It is not my mirror, or anything silly like that. It only occurs when I put my foot down. Sounds like the turbo? Its a 2.8L Pajero. Ideas?



(Side note.. my head is spinning with put in a pyro!, 2.25" exhaust, no 3", remove catalytic converter, direct fro K&N.. ahhh
Where do you get a pyro?
Whats the point of 2.5" exhaust if your not upgrading your manifold size?
Magnaflow?
K&N OEM or direct flow custom dealio?
I just want to to run like a top and have more kick off the line in a healthy sorta way. sigh.... shoulder to cry on? Spare some change?)

Cheers all!

[Pajerist]

I have recently noticed this noise. It is not my mirror, or anything silly like that. It only occurs when I put my foot down. Sounds like the turbo? Its a 2.8L Pajero. Ideas?

Does it happened when engine cold or even when it warmed up?

[jessef]

I have recently noticed this noise. It is not my mirror, or anything silly like that. It only occurs when I put my foot down. Sounds like the turbo? Its a 2.8L Pajero. Ideas?



(Side note.. my head is spinning with put in a pyro!, 2.25" exhaust, no 3", remove catalytic converter, direct fro K&N.. ahhh
Where do you get a pyro?
Whats the point of 2.5" exhaust if your not upgrading your manifold size?
Magnaflow?
K&N OEM or direct flow custom dealio?
I just want to to run like a top and have more kick off the line in a healthy sorta way. sigh.... shoulder to cry on? Spare some change?)

Cheers all!

come to the meet here and there's enough ears to tell you what the sound is and enough heads to answers the other q's

http://www.delica.ca/forum/let-s-do-ano ... 12747.html

Installing a pyro should not have any relation to what size exhaust you use

[dfnder]

Just to widdle it down a little, is it speed related or rpm related? I had a whirring sound and it took me the longest time to figure it was a foam gasket over the headlight that was loose... speed related

[LeeHammy]

Only when it has been warmed up well. After an hour of driving or so.

[LeeHammy]

Ok so... It turns out my turbo was audible because I had a loose intercooler hose so I was hearing the turbo. Nothing wrong with hearing its sexy voice.
So here's the plan.
The intercooler is dirty because of oil from the dump valve as will be my turbo. So I could install a catch can. But whats the point. Why not just cap off my dump valve (cant remove it its built into the intake manifold) and add my own blow off into the intercooler hose which I will re-pipe with aluminum and silicone hose. Then I can adjust it to the 13.7psi it is from factory or a bit more if I want. Then if I wish to blow it off to atmosphere for that cool but kinda douche baggy whoosh noise I can. If not I can dump it into the turbo intake and no need for an oil catch can because it is dumping from before the intake manifold. No oil!
I can remove my old air intake system and put in a K&N filter. Build my own heat shield and re-pipe my forced air intake from behind the grill to slam loads of cold air in the nose of the K&N.
My next step..... get a 3" exhaust put on.
Recap: Now it is sucking in cold air no restrictions, no oil to the turbo intake, cleaned and flushed intercooler ($50 at a rad shop) then I have efficient heat transfer so my intake air is cold. The blow off will maintain and keep my boost and I can adjust it higher if more power is needed. Then no restriction to the exhaust so the turbo spins like it was born to (depending if my waste gate is operating correctly or not). Only step after that is get a turbo tune at CVI to clear out all the crud from years of running the poor thing with out these mods.

Good or bad... Feed back?

[jessef]

Then I can adjust it to the 13.7psi it is from factory or a bit more if I want.

9 psi from factory. 13.7 is too high without mods.

get a 3" exhaust put on.

There is no gain above 2.5" exhaust unless you put on a larger turbo with a 3" dump pipe (if you can fit it in there).

[LeeHammy]

Oh ok, my Pajero manual says max boost is 13.7psi. I guess that is the point at which the waste gate then regulates open to maintain 13.7 but if the throttle shuts you don't want to keep 13.7psi in the intercooler because it is hard on the turbo and throttle? So you are saying anything over 9psi is to be vented out of the intercooler when the throttle closes and keeping 9psi in the intercooler for a boost to minimise turbo lag next time I accelerate? Is that correct? What determines the pressure you should keep in the intercooler when the throttle is shut without stressing your components but still keeping pressure for your next acceleration?

And yes.. 3" would just be for sound looks and so I have no restrictions. I will be piping out the back of the Paj so that means I will have some bends I have to keep over the rear axle and going to 3" might make it seem as though I had 2.5" and piped it straight out the side... I think. I want some back pressure but that will be provided by my muffler so my thinking is everything else wide open. What are your thoughts on 2.5" to the muffler and 3" down stream of the muffler?

Thanks for your feedback!