Diverter valve on a diesel? - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• Diverter valve on a diesel? by Barry W on 30 Jan, 2007 22:34
• I have a '91 1.6TD, i'm about to rebuild the motor and i'm new to VW diesel's but not to VW's.
  
  Question is: Do turbo diesels use a diverter valve or blow off valve?
• #1 by jtanguay on 30 Jan, 2007 22:49
• the 1.6TD has a 'safety' blow off valve that opens at around 12-13 psi.
  
  you don't really need it... just get a boost gauge and regulate with your foot... thats what i do
• #2 by QuickTD on 31 Jan, 2007 06:54
• A blow off or diverter valve is used to relieve the pressure behind the throttle plate when the throttle plate suddenly closes. This prevents the turbo from "surging" due to lack of airflow. Diesels do not have a throttle plate and continue to flow lots of air on overrun so a blow off valve is of no use.