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      01-14-2013, 06:18 PM   #2

Drives: 2016 X5 5.0i
Join Date: Oct 2011
Location: Southwestern PA

iTrader: (0)

Originally Posted by Tag View Post
I'm trying get some information on Stage 1 aggressive maps for AccessPORT regarding octane. The stock ECU can detect the octane level and adjust. For instance, if I put in 89 octane it will automatically detune itself to avoid damage from pre-ignition. If I run the 93 octane aggressive map and end up filling with 91 octane gas because 93 was simply not available in the location I was in would the reprogrammed ECU be smart enough to detect the drop in octane and adjust?
Based on your car, you should probably post in the N54 section. However, my understanding is that the car will NOT adjust with Cobb. Stage 1 aggressive should be run with 93, or at least really good 91 if logs show everything is ok. Crappy 91 and an aggressive map may cause some issues. Someone please correct me if I'm wrong.