The only altitude correction is the O2 sensor correcting the final fuel mixture. As for stalling the idle stabilizer should have been able to maintain idle. As for the power loss, all normally aspirated engines will lose approximately 3# for each 1,000 feet of elevation. This is due to the loss of cylinder charge, compression, and O2. Yes, at 12,000 feet you will lose 36% of your engine. You should have seen my motor struggle through Denver. This is also way gasoline sold at higher altitudes is a lower octane. High octane is not needed at the reduced pressures.
 
Dennis
 
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com]On Behalf Of Forhan, Thomas
Sent: Tuesday, September 04, 2001 1:30 PM
To: vanagon@GERRY.VANAGON.COM
Subject: High Altitude Problems -'90 WBX

Can the Digifant system be reset for high altitude operations?

 I thought there was supposed to be altitude correction, but on my recent vacation in my '90 Syncro Westie, above 12,000 feet I had consistent stalling at idle and a very significant loss of power. Engine freshly tuned, off course.

Any ideas?

Thanks

Tom F.
90 Syncro Westie
83.5 9 Pax S/R GL