High altitude operation with a 3.8 EFI = CRAP? - Defender Source
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Old December 31st, 2005, 07:47 PM
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Join Date: Jul 2004
Location: Palm Beach
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High altitude operation with a 3.8 EFI = CRAP?

My girlfriend took my 92 Range Rover Classic out to Colorado for the winter and it lives around 9000-13,000 feet. The car was operating perfectly when it left Vermont and now has ZERO, NADA, BOOBOO, NOTHING for power. Is this typical of high altitude operation or does the car need to be re-tuned specifically for altitude? I'm assuming a D90 with a 3.9 is the same as a RRC.

Any thoughts would be appreciated.

Thanks and happy new year.

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Old January 1st, 2006, 03:35 PM
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Robert Dassler
1994 D90
D-90 Source Vendor
Join Date: Apr 2004
Location: Albuquerque, NM, USA
Posts: 987
About the only thing you can do is bump up the initial timing...take it from 6BTDC to 10 or 12BTDC Typically you lose 4-5% of an engines power for every 1000 feet of elevation...having lived at altitude my whole life, I am always amazed how much more power my truck has at sea level. I guess it's a matter of perspective.

Rob Dassler
SWR Automotive
505-872-7818 (shop)
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Old January 2nd, 2006, 06:15 AM
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Jason Herring
94 D90 ST #1253
Join Date: May 2004
Location: San Pedro, CA, USA
Posts: 561
A turbo or supercharger will solve your problem nicely.. of course, it's not cheap!
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