Results 1 to 5 of 5

Thread: Turbo Blow valves?

  1. #1
    Hotcrusader76
    Could someone please explain to me the reason for a turbo blow down valve for a turbo charged motor? Theory of operation and the sole reason it is there or was added to the car or truck?
    I am leaning towards the reasons being:
    It saves the turbo...but how and why?

  2. #2
    BrendellaJet
    is this the same as a waste gate?

  3. #3
    Hotcrusader76
    BrendellaJet:
    is this the same as a waste gate?That's what I thought....but no its not..?????....I think 78Eliminator can comment on this, since he has the expierence in it...
    He has a turbo civic he built.....I guess I'll wait for his response, unless someone else can clue me in...

  4. #4
    Jordy
    Are you talking about a pop-off valve? If so, that is to relieve excess boost spikes before you start blowing parts of your motor apart. They react a little quicker than a wastegate. Also, the wastegate is more of a bottom end tool to cut down on the turbo lag.

  5. #5
    HeavyHitter
    It all has to do with slamming the throttle shut. Ever hear a really hopped up turbo engine? Rally cars, GTP's, LMP's, all have that chirping noise as they go into corners. That's the turbo going to surge. Surge is when the compressor wheel can support the pressure any more and the air flow backwards over the blades. The easiest way to get this to happen is drive at WOT and full boost. Turbo is putting out a lot of air. Slam the throttle shut and the pressure goes sky high until it can't hold it in any longer(big shirping noise follows). It all happens at sonic speed so the impact on the turbo can shorten life dramatically. Big popoffs are now popular in the import drag racing scene. Turn the line lock on and rev the engine till the turbo is spooled up. Instead of sitting there at surge you blow off the excess air until you snap the throttle open. Viola, full boost just like a blower.

Similar Threads

  1. would titanium valves work in turbo
    By badbug in forum Gear Heads
    Replies: 9
    Last Post: 12-02-2007, 08:59 PM
  2. Boost referenced Power Valves or No Power Valves
    By john f2000 in forum Gear Heads
    Replies: 22
    Last Post: 09-09-2006, 02:40 PM
  3. valves
    By 454-ways-to-go in forum Gear Heads
    Replies: 24
    Last Post: 01-08-2006, 11:13 PM
  4. BBC Valves?
    By sanger rat in forum Gear Heads
    Replies: 10
    Last Post: 01-05-2005, 09:07 PM
  5. Valves
    By Bow Tie Omega in forum Gear Heads
    Replies: 7
    Last Post: 01-19-2003, 06:20 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •