Bursting sound on turbo system

Tiny
ERNANGEL
  • MEMBER
  • 1995 NISSAN SERENA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
Nissan serena 2.0 dsl cd20t engine auto trans why
while speeding at 90+rpm and the turbo rpm 2900 bursting sound exist in turbo system and engine and turbo rpm drop right away. Same time bursting sound stop after I step off the accelarator. It always happened when I travel long distance.
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Friday, May 6th, 2011 AT 11:28 AM

1 Reply

Tiny
MMPRINCE4000
  • MEMBER
Turbo cars are equipped with a compressor bypass valve, also called a blow off valve.

This protects the compressor wheel from damage when under boost and you suddenly let off gas. The compressed air on compressor side is vented to atmosphere or back to compressor side.

If you did not have this the compressor wheel would be damaged.

Sounds like the valve is venting somewhere other than what it is supposed to.

Check tubing and connections to bypass for leaks or missing/loose clamps.
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Friday, May 6th, 2011 AT 12:28 PM

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