flat out Posted September 24, 2009 Report Share Posted September 24, 2009 the way i see it is any thing that doesnt run an intercooler doesnt run a bov, like 3tgte's, maxima's vl's, put an intercooler on and you get flutter/does. i have had a turbo setup with no intercooler and a bov, it blew off, blocked it off and made some retarted noise, put in a cooler and dosage come, each to there own Quote Link to comment Share on other sites More sharing options...
Evan G Posted September 24, 2009 Report Share Posted September 24, 2009 you can also hear a does before it goes boom and lets remember these things run 40psi++++ Quote Link to comment Share on other sites More sharing options...
Trev Posted September 24, 2009 Report Share Posted September 24, 2009 Diesels don.t have a butterfly so they don't need a bov and they limit the boost by the size of the exhaust, intercooler is just being lazy Normally diesels have internal waste gates or vein vane control. Quote Link to comment Share on other sites More sharing options...
Evan G Posted September 24, 2009 Report Share Posted September 24, 2009 ^ correct a moundo Quote Link to comment Share on other sites More sharing options...
GTS-T_Sedan Posted November 29, 2009 Report Share Posted November 29, 2009 finally found a video that shows true compressor surge, and not flutter this is what you don't want, whereas flutter is for the kicks Quote Link to comment Share on other sites More sharing options...
Sam_Q Posted December 4, 2009 Report Share Posted December 4, 2009 I have read in more than one place now that factory blow off valves are to reduce noise when the throttle shuts, which if true is really ironic Quote Link to comment Share on other sites More sharing options...
styler Posted December 4, 2009 Report Share Posted December 4, 2009 (edited) also all factory blow off valves are recirculating / plumb back as far as i know Edited December 4, 2009 by styler Quote Link to comment Share on other sites More sharing options...
irokin Posted December 4, 2009 Report Share Posted December 4, 2009 I have read in more than one place now that factory blow off valves are to reduce noise when the throttle shuts, which if true is really ironic If they're plumbed back you really can't hear them. Quote Link to comment Share on other sites More sharing options...
oh what a nissan feeling! Posted December 5, 2009 Report Share Posted December 5, 2009 Surge is explained on the garrett website, they supply detailed compressor maps for each turbo so surge under load can be avoided. on the topic of bov. From the garrett website: Surge is also commonly experienced when the throttle is quickly closed after boosting. This occurs because mass flow is drastically reduced as the throttle is closed, but the turbo is still spinning and generating boost. This immediately drives the operating point to the far left of the compressor map, right into surge. Surge will decay once the turbo speed finally slows enough to reduce the boost and move the operating point back into the stable region. This situation is commonly addressed by using a Blow-Off Valves (BOV) or bypass valve. A BOV functions to vent intake pressure to atmosphere so that the mass flow ramps down smoothly, keeping the compressor out of surge. In the case of a recirculating bypass valve, the airflow is recirculated back to the compressor inlet. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.