VWDiesel.net The IDI, TDI, and mTDI source.

Engine Specific Info and Questions => IDI Engine => Topic started by: drrtybyl on February 09, 2009, 05:16:15 pm

Title: Can a high altitude comp. be altered to act like an LDA?
Post by: drrtybyl on February 09, 2009, 05:16:15 pm

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)?

Title: Can a high altitude comp. be altered to act like an LDA?
Post by: AudiVWguy on February 09, 2009, 05:56:21 pm

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

Title: Can a high altitude comp. be altered to act like an LDA?
Post by: vwnut84 on February 13, 2009, 11:03:08 am

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)