Quote:
Originally Posted by Desert Rider
Darin,
My first post, but here goes. My LS-3 arrives in two weeks. I live in the Four Corners and so will be breaking in the engine at 5,500-6,500 ft elevation. I plan to find a long hill to climb (over and over), on a 4-lane road w/ 70 mph limit.
Do you recommend any changes in your "normal" break-in procedure (described above)?
Also, since I won't develop as much engine HP with only 11.73 psia ambient air pressure, do I need to run high octane (91 here) fuel? Would lower octane fuel (87) reduce engine output at this elevation? Any other impacts from low ambient air pressure?
Thanks,
DR
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Sorry. I did not catch the octane question.
The answer is , I dont know. I dont know for sure so I will do some research and find out if those cars have a high altitude fuel and timing map from the factory. I doubt very seriously that these cars come in a "high Altitude" combination like some of the trucks I owned. I did own an F150 with a high altitude PCM and engine combination from the factory. The engine had 1 point more compresion and the PCM was tuned to try and makeup the deficiency's of high altitude operation. Again, I doubt VERY seriously that these cars have any such tune or combination but I will find out. First and foremost yu should call your dealership and ask for the service manager. The service manager should know what octane and if the PCM is tuned for high altitude operation.