Turbo flutter?

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Kirby

Kirby

Lifer
Apr 10, 2006
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I've got a 2000 Jetta 1.8T with ~145k miles on it. When I accelerate hard, normally where I hear the turbo spool up and "pssss", I hear a weird fluttering sound. It goes away when I let off the gas. Diverter valve maybe? Anyway I could test it to see if it's working correctly?
 
Bartman39

Bartman39

Elite Member | For Sale/Trade
Jul 4, 2000
8,867
51
91
Could be a blown boost tube boot (either blown off or a hole)...? There are boots (short hoses) that connect the turbo to tube that go to the intercooler and from it to the intake... Should be a total of 4 but possibly more...? Any loss of power with the sound...?

Could also be the waste gate coming in to soon...? Dont think it has a VVT turbo...?
 
Kirby

Kirby

Lifer
Apr 10, 2006
12,028
2
0
I can't really tell if there's any power loss. It's not like there was much to begin with.
 
Spicedaddy

Spicedaddy

Platinum Member
Apr 18, 2002
2,305
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91
Probably a leak in the piping between turbo and intercooler. (Google "1.8T pancake pipe", that's the most common place it leaks)

Or DV. Take it out, push piston with a pen and hold finger on the other hole. If the piston stays in place, it's good.
 
Fenixgoon

Fenixgoon

Lifer
Jun 30, 2003
32,924
12,259
136
if it's a hiss that gets louder as you need more boost, chances are there's a leak somewhere.
 
L

lavaheadache

Diamond Member
Jan 28, 2005
6,893
14
81
my a4 1.8t had a similar thing going on. I swapped out my diverter valve for a Forged 007 valve and the problem was fixed. My stock valve was cracked. I also had a similar like problem when I forgot to toque one spark plug in the card and was leaking compress out of it
 
C

coxmaster

Diamond Member
Dec 14, 2007
3,017
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I assume its not tuned/running extra boost?

Either way a new DV is probably a good choice
 
Kirby

Kirby

Lifer
Apr 10, 2006
12,028
2
0
Nope, it's all stock. Are those Forge 007s loud? I don't want anything obnoxious.
 
DivideBYZero

DivideBYZero

Lifer
May 18, 2001
24,117
2
0
Flutter is often boost returning back through the turbo, so I would check the DV, too. If you get a new one and you aren't a hooligan, don't get a VTA one, get a recirculating one like the stock unit.
 
zerocool84

zerocool84

Lifer
Nov 11, 2004
36,041
472
126
DivideBYZero said:
Flutter is often boost returning back through the turbo, so I would check the DV, too. If you get a new one and you aren't a hooligan, don't get a VTA one, get a recirculating one like the stock unit.
Click to expand...

Yea unless you tune specifically for it, changing your recirculating unit to an external venting one would create problems in the long run since the system is expecting the recirculation.
 
Kirby

Kirby

Lifer
Apr 10, 2006
12,028
2
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zerocool84 said:
Yea unless you tune specifically for it, changing your recirculating unit to an external venting one would create problems in the long run since the system is expecting the recirculation.
Click to expand...

If it's the problem I'll just get an OEM one. I'm not really looking to show off my massive 150HP.
 
DivideBYZero

DivideBYZero

Lifer
May 18, 2001
24,117
2
0
zerocool84 said:
Yea unless you tune specifically for it, changing your recirculating unit to an external venting one would create problems in the long run since the system is expecting the recirculation.
Click to expand...
It's not really a problem. I ran a Forge VTA DV on my Scooby for a while. The worst thing that can happen is you have a few cycles with less air than the ECU has measured, meaning you get a few rich cycles. Running rich in a turbo car is never a problem, running lean is.
 
B

basslover1

Golden Member
Aug 4, 2004
1,921
0
76
nkgreen said:
If it's the problem I'll just get an OEM one. I'm not really looking to show off my massive 150HP.
Click to expand...

Probably the DV. You have a few replacement options. You could use an OEM part for your car, the OEM part for the 225HP Audi TT, or an aftermarket valve.

I went with a used aftermarket valve, I think it was like 50 bucks.
 
Kirby

Kirby

Lifer
Apr 10, 2006
12,028
2
0
Probably not the problem, but the crankcase vent valve hose isn't in great shape.
 
S

SuperSix

Elite Member
Oct 9, 1999
9,872
2
0
Sounds like a damaged/weak diverter valve allowing boost past, then closing, and opening again - etc.
 
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