Wird Turbo Sounds

[Sammy34]

This may not be a problem at all, its probably just me being over protective of my car.

Currently Im running standard turbo on r34 gtt at 13psi. The turbo sounds fine up until around 10psi then it makes lick a loud flickering sounds, possible could be described as a vibration sound under heavy load. I need to do some more testing myself while driving but i seems to only happen when i put my car under heavy load once its already moving NOT on a fast take off.

I thought it may be a bit of shaft play or something along those lines.

One again I may be being over protective of my car but it just doesnt sounds right to me. Anyone got any ideas of what it may be?

[d1_drifter]

Turn the boost down.

12psi and beyond is lethal on a stock ceramic Neo turbo. The vibrations you're experiencing might well be shaft play...

How long have you been running 13psi for?

[Sammy34]

Turn the boost down.

12psi and beyond is lethal on a stock ceramic Neo turbo. The vibrations you're experiencing might well be shaft play...

How long have you been running 13psi for?

ah the better part of 3 months I guess, and I dont really drive my car llike a maniac. If its shaft play, its already starting to happen at 10psi so i may as well start looking for a new turbo regardless yeh?

[2LV8ETR]

12psi and beyond is lethal on a stock ceramic Neo turbo.

I may be wrong, but don't they use a nylon wheel?

[Sammy34]

I may be wrong, but don't they use a nylon wheel?

yeh nylon. Done a quick squizz aroudn the ent and it does seem to be shaft play :S looks like i will be starting my cars upgrades sooner than i thought.

[d1_drifter]

It's a ceramic bearing with a nylon based compressor wheel.

[SiR_RB]

nylon compressor wheel with ceramic exhaust turbine wheel

Edited March 12, 2009 by SiR_RB

[Sammy34]

nylon compressor wheel with ceramic exhaust turbine wheel

MM so I spoke to my mechanic, could be anything, worst case senario turbo is Mcrooted. could be a intercooler piping problem which could result in the turbo overworking so we have the same outcome of turbo Mcrooted. Gana look at getting it repaired and hi flowed. Or a resonably priced bolt on.

[blockasR32]

make sure the intake pipe is not sucking shut

go with a hyper gear turbo. really good service, very decent price and pretty good quality.

hypergear

done really well with me

[Sammy34]

so this is really starting to concern me as i would have thought, if this weird vibration im getting above 10psi was the turbo i would have expected it to die by now... i probably need to get a recording of it, but its difficult as it only happens when the car is moving, if i park the car and rev the engine it doesnt happen :S

Its like a vibration sound could be closely related to the sound of a helicopters blades starting to pick up speed.

[ClutchBurndout-:(]

are you sure its not the engine making the noise?

[Sammy34]

are you sure its not the engine making the noise?

it could be, but it only happens when the i start to boost over 10psi, doesnt happen if i launch from a stand still position.

[SS8_Gohan]

you got a boost controller?

[Sammy34]

you got a boost controller?

yeh mate using AVCR

[Equinox]

It's probably the AVCR's solenoid ticking.

My old PowerFC boost control kit (which used the same solenoid as the AVCR) went nuts when I neared full boost. Could hear it easily in the cabin.

[paulr33]

its detonation

back off the boost

[SS8_Gohan]

paul is waaaaay more learned than me so i'd be inclined to list to him, but yeah, the reason why i asked about the BC because i've just recently found out they can make a ticking noise when coming onto or around boost.

we just put some foam behind the solenoid to stop the ticking. It "could" be what's happening to you, but you are running a decent amount of boost for a stock turbo

[Sammy34]

paul is waaaaay more learned than me so i'd be inclined to list to him, but yeah, the reason why i asked about the BC because i've just recently found out they can make a ticking noise when coming onto or around boost.

we just put some foam behind the solenoid to stop the ticking. It "could" be what's happening to you, but you are running a decent amount of boost for a stock turbo

So ive found out it could be compressor surge, non the less, get new highflow turbo, plenum, airflow meter and injectors done this week, so we will see waht happens.

I highly doubt its detonation as this car is so well looked after, gets a FULL services every 5,000 km's. The engine has only done jsut over 100,000 or so Km's and has had the timing belt and everything done. Never gets touched by anyone bar my mechanic who i trust with my car more than I trust myself. The car is never thrashed, infact its very unlikely the cars see the likes of that 13psi more than 4 times since it was last tuned.

But the car will be tested and dynod this week and ill post up dyno charts and any problems we encounter in the process.

[sIIgtst]

So ive found out it could be compressor surge, non the less, get new highflow turbo, plenum, airflow meter and injectors done this week, so we will see waht happens.

I highly doubt its detonation as this car is so well looked after, gets a FULL services every 5,000 km's. The engine has only done jsut over 100,000 or so Km's and has had the timing belt and everything done. Never gets touched by anyone bar my mechanic who i trust with my car more than I trust myself. The car is never thrashed, infact its very unlikely the cars see the likes of that 13psi more than 4 times since it was last tuned.

But the car will be tested and dynod this week and ill post up dyno charts and any problems we encounter in the process.

Detonation is down to the tune not the general upkeep of the engine .. even brand new engines can have det.. its all in the tune i.e ignition timing.. are you running an aftermarket ecu or just the standard one? did you check the base timing when the timing belt was done? these could be some possibilities , not having a go at you or your tuner just trying to help..

Goodluck with it

[Sammy34]

Detonation is down to the tune not the general upkeep of the engine .. even brand new engines can have det.. its all in the tune i.e ignition timing.. are you running an aftermarket ecu or just the standard one? did you check the base timing when the timing belt was done? these could be some possibilities , not having a go at you or your tuner just trying to help..

Goodluck with it

ah ye hi understand that but I trust the tuner I used as he learnt from matt spry. Yeh I have a nistune vg30 chip.