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  • Three pedals are better then two..
  • Donating Members
  • Member For: 17y 11m 6d
  • Gender: Male
  • Location: Melbourne

No, but my sisters brother in laws half cousins mate wrotethis

  • Member
  • Member For: 17y 6m 16d
No, but my sisters brother in laws half cousins mate wrotethis

Im not trying to be a pain but...

If you read many of the topics, some are pro BOV some are Anti-BOV. Its hard to get a straight answer. Your reference says the turbo stalls resulting from the flutter. Other threads say the pressure of the air causing the flutter is sweet F all and wont in any way damage the turbo. If it slows it down, its still negligible..

Why didnt VL turbos run BOV? Are all those turbos ruined or are they still boosting up some 20 years later...

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  • Member For: 18y 1m 19d
  • Gender: Male
  • Location: syd south

yes I would say 90% of the turbos fitted to vl turbos have been rebuilt,theyre old bush bearing units and the public knew nothing about turbos and how to properly look after them,I just removed one the other day and the shaft play was massive.

the bov was first used on air flow meter equipped turbo cars to prevent the air returning after the throttle closes from being "metered" a second time which causes over fueling,not to gain performance between gear shifts.

if you do a bench test with compressed air you will see that even a tiny amount of reversing air has a pretty big effect of shaft rpm,so it definately does slow the spool time.

atmo bov's are illegal on any vehicle made after 1972 so if you want it legal its gotta be plumbed back.

  • Three pedals are better then two..
  • Donating Members
  • Member For: 17y 11m 6d
  • Gender: Male
  • Location: Melbourne

Yeah I know mate, the thing is I went on the same quest a while back and didn't get anywhere.

There a lot's of people with all different bovs and lots or people running no bovs, everyone is going to tell you their setup is best to justify why they have done it.

My opinion is bovs are better for the engine, but that is just my opinion and not based on fact. Maybe if you do some research on other turbo forums you might have more luck or even get in touch with Garret or HKS direct and see if you can get a bit more info from them.

If you do find any factual evidence that proves either theory please make sure you share with fellow members so we might actually get somewhere in the debate.

  • Mmmmm......BOOST
  • Member
  • Member For: 18y 4d
  • Gender: Male
  • Location: central coast

. The inlet charge of air is arguable warmer than that of the plumb back boost dump as its now vented to atmo (the cooler after intercooler air is lost). The stock Bov does not vent enough air, hence the flutter that continues (although less than no bov)

even though the air has been through the intercooler even on the best set ups , it's still a few degrees above the temp of the air coming in through your intake

  • Well-Hard Bangin' Member
  • Member
  • Member For: 17y 8m 12d
  • Gender: Male
  • Location: Perff, WA
Im not trying to be a pain but...

:blush:

If you read many of the topics, some are pro BOV some are Anti-BOV. Its hard to get a straight answer. Your reference says the turbo stalls resulting from the flutter. Other threads say the pressure of the air causing the flutter is sweet F all and wont in any way damage the turbo. If it slows it down, its still negligible..

both sides of the argument are unfortunately correct!

Why didnt VL turbos run BOV? Are all those turbos ruined or are they still boosting up some 20 years later...

our cars do come with them... does that give you any clues as to whether to use them or not??

I've seen plenty of VL's with bov's, does that show indication of purely a noise intent?

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