need advice. odd noise

[Paddy]

okay... last night was out cruising around. i gave it full throttle in second gear, at spike boost / full boost or 3250ish rpm it developed a loud screaching like sound. its the type of sound i would associate with a slipping belt. it is also similar to the induction note of my hks suction filter... except much higher pitched. its recreatable too, full throttle in second gear and i hear the noise

boost-wise i'm running stable at 0.8 bar, but i have seen spikes up to 1.1bar!

the boost gauge is reading as it normally does. i cant see any pipes off, eg the actuator, boost sensor, relief valve. i'm swithing back to the factory solenoid to see if its in the relief valve.

i suspect that it maybe the fmic piping with a pin hole leak, exhaust leak or could it be on the fresh air side of the turbo?? i would be very interested to know if anyone has had similar experiences, and what you think i should be lookin out for. Thanks.

Paddy

BTW what does WOT stand for

 

[pablo]

wide open throttle...?

 

[Paddy]

wide open throttle...?

ah... it all makes sense now!

 

[pablo]

cool

 

[Yakozan]

Could be a small boost leak.
My buest guess of the location are the IC piping or the turbo to manifold gasket.

Could be something else though.

 

[Paddy]

okay...
factory solenoid on, boost is very low. only 0.6 bar and no spiking. fault is still appearant, except now at 6-7k rpm at WOT. seems to be boost leak so.
I guess the relief valve was covering a boost leak, because it used to be 0.75 bar on the solenoid and wmic ??? does that sound right??
Is there any handy way of checking for leaks? how do i pressurise the pipes while stationary?? should i just tighten everything up and cross my fingers?

being negative... which i'm very good at... anyone know if the sound could be the internals of the turbo?

 

[Paddy]

okay...
FMIC pipes all tightened up... no change. I've a sneaking suspicion that the factory dump valve is dying . Does anyone have any experience of one dying on them?
So, my next lil project is the pigeon mod , see if it clears it up... i did a test run with a cork from a wine bottle and my thumb to block the pipe on the rockercover, sounds cool too.
just have to figure out what i might have lying around to block the pipes!

 

[Paddy]

the turbo to manifold gasket.

:thumbs: good call yakozan... thats where it was alright... it just died today, i must not have put the locking tab on correctly when doing the manifold, because one of the bolts dropped straight out there looks to be a lovely hole in the gasket now...

ah well... more fun for tomorrow

 

[japmadlad]

u bac on da road yet?

 

[Paddy]

afraid not... got it all back together... filler the radiator... started the engine.......


and i've a water leak!


the joys of removing the turbo! :annoyed:

ah well tomorrows another day, i'll just borrow a car outta work

 

[japmadlad]

yea but its a kia so wats da point :rotfl:

 

[Paddy]

hey... we make a RWD sorento last week... :rotfl: but still no s15s

ah i'm sure i can find something nice in the second hand cars

 

[japmadlad]

yea it was rwd but u still cudn't drift it . how bout the 1.2 ecotec astra. sure its a gr8 car:rotfl:

 

[Paddy]

yea it was rwd but u still cudn't drift it . how bout the 1.2 ecotec astra. sure its a gr8 car:rotfl:

it wouldn't drift, just spun the inside wheel for ages :nod:
and that astras about as fast a wind erosion :ghey:

hmmm. there might be a celica that i could 'borrow' :rotfl:

 

[japmadlad]

mmmmmm celica u say?
are we talkin new shape vvti:hurl: or older shape gt4 perhaps

 

[Paddy]

mmmmmm celica u say?
are we talkin new shape vvti:hurl: or older shape gt4 perhaps

nah... nothing fancy, 94+ shape but not gt4. just a 2ltr, at least it moves...

 

[japmadlad]

2L twin cam, not to shabby

 

[Paddy]

2L twin cam, not to shabby

3sge not equal sr20det :no:
and understeer??

 

[japmadlad]

aw wel at least its not a kia. got the email bren sent me. its pics of a type 2 fmic & doesn't show the stainless steel elephant trunk replacement pipe