Can a high altitude comp. be altered to act like an LDA? - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• Can a high altitude comp. be altered to act like an LDA? by drrtybyl on 09 Feb, 2009 17:16
• I remember reading a thread about this a while ago, but couldn't find it.
  
  Can an IP with a high altitude compensator be altered to act like an LDA?  Or rather, does an HAC operate just like an LDA (but in reverse maybe)?
• #1 by AudiVWguy on 09 Feb, 2009 17:56
• Yes you can. The diaphragm must get boost pressure going to the top side of the diaphragm, thus pushing down the pin under the diaphragm to increase fueling. The underside of the diaphragm should be vented to allow the air to escape. I have one on my shelf that worked fine until it developed a leak.
  Good luck,
  -JB
• #2 by vwnut84 on 13 Feb, 2009 11:03
• That's correct, I just did this myself last fall, all I did was swap over the fittings to the new pump (boost line and the vent below it as the HAC has slightly different connections)