Author Topic: Turbo Compressor "Surge" (Read 10684 times)

Smokey Eddy · « **on:** March 03, 2009, 03:33:40 am »

When you're boosting in excess of 15psi and you release your foot off the smoke pedal and you hear that incredible WOOOOOOOOOSSSSSSSSSH sound, is that compressor "surge"? and can it be harmful? what exactly is making this enormous sound?

with just a 2.5" down pipe that ends at the shifter its a super loud wooo-er-ing sound.

There is a bloke on here who has a video of his turbo making the sound in the distance. Mine is way way louder than that. I hope i'm not breaking things?

its t3 and it hit 25+ psi a couple times and that's when the surging sound was loudest (which makes sense)
i have an aaz head on a 1.6td MF bottom end everything attached to the head (except the block) has been ported and polished.

rallydiesel · « **Reply #1 on:** March 03, 2009, 12:13:45 pm »

I think turbo surge is more of a barking sound and yes it is very bad. I'm pretty sure the sound you hear is normal as mine makes it too.

spencebm · « **Reply #2 on:** March 03, 2009, 05:40:18 pm »

omg my turbo is blowing up cause it makes noise, turbo bark, better take turbo off, throw away, turbo bad :wink:

8v-of-fury · « **Reply #3 on:** March 03, 2009, 06:52:58 pm »

Quote from: "spencebm"

omg my turbo is blowing up cause it makes noise, turbo bark, better take turbo off, throw away, turbo bad :wink:

RACIST!!!!!

I love being random... lmao ED your car is gooood

Run It HARD lol

Smokey Eddy · « **Reply #4 on:** March 03, 2009, 08:07:17 pm »

sooooooo
it has nothing to do with this oil leak i have? I thought it was from the oil pan but now (removing the exhaust) I see an oily mist all over everrytthingg...

8v-of-fury · « **Reply #5 on:** March 03, 2009, 09:12:01 pm »

an oily mist!? like.. is it coming from .... where is it coming from? have you narrowed it down yet?

Smokey Eddy · « **Reply #6 on:** March 03, 2009, 09:47:29 pm »

I just found it this evening =)
It was coming from the oil cooler sandwich plate sensor. I tightened it a bit (its a 24mm for reference) but i think it's stripped out.

Good thing i have a sandwich plate for an oil cooler! Phew. Just gotta drill and tap it PRE cooling.

it would dribble down the block and disperse because of the flow of the wind from moving. And it would just mist off of everything.

I'm still having turbo issues though but its boost related not necessarily turbo related. I'm glad the WWWWWWHIIIIIIIERRRRRRRRR sound is okay

definitely doesn't sound alarming like barking.

dillenger1 · « **Reply #7 on:** March 04, 2009, 02:19:15 pm »

I think the sound your talking about is the backfire when you let the pedal go.The pressure built up has nowhere to go so it tries to escape out the compressor.

Smokey Eddy · « **Reply #8 on:** March 05, 2009, 02:43:29 am »

now THAT makes sense...

does one want to avoid this? I would imagine so...

spencebm · « **Reply #9 on:** March 05, 2009, 06:18:43 am »

where are you Tom when we need you

truckinwagen · « **Reply #10 on:** March 05, 2009, 08:54:43 am »

compressor surge is a big problem with gasser motors, when the throttle is closed quickly there is a huge spike in pressure as there is nowhere for the air to go, this causes the turbo compressor to try to drive backwards, very bad for the turbo it can break the shaft.

that is why gassers have blow off valves or diverter valves, to relieve this pressure before it breaks something.

on a diesel letting off the throttle changes nothing about where the air can go, there is still an unobstructed path into the cylinders.
the noise you hear is the compressor de-accelerating because the exhaust turbine is not driving as hard due to less exhaust gasses.

don't worry about it, surge is not a big issue in diesels.

zukgod1 · « **Reply #11 on:** March 05, 2009, 12:36:01 pm »

Quote from: "truckinwagen"

don't worry about it, surge is not a big issue in diesels.

Really?

I have a couple turbos that would disagree.. Snapped shafts, ground down compressors etc etc.

Where I do agree it's not as a big of a deal on diesels it's still a issue and it's an issue that can destroy your turbo.

truckinwagen · « **Reply #12 on:** March 05, 2009, 01:11:46 pm »

how much boost were you running?

diesels don't have the inherent tendency to deadhead the turbo the way a gasser does when the throttle plate closes so it should be much less of an issue.

dillenger1 · « **Reply #13 on:** March 05, 2009, 04:15:48 pm »

if your boosting 20psi the cylinder may not inhale all the pressure left therefore it tries to escape out the inducer.

zukgod1 · « **Reply #14 on:** March 05, 2009, 07:36:37 pm »

Quote from: "truckinwagen"

how much boost were you running?

Just a coulpe lbs :twisted: :twisted: :twisted:

Well ok maybe a tad more than that but as dillenger1 pointed out throttle plate or no if that suka is pushing 20 psi and you let off the fuel its still pushing 20 psi for a sec. That air has to go somewhere and back past the compressor is the sound you hear. Not good for the turbo either way

Author Topic: Turbo Compressor "Surge" (Read 10684 times)

8v-of-fury

8v-of-fury