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Old 12-02-2012, 05:41 PM
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SergioK SergioK is offline
Location: N35 29.359 W119 32.670
Join Date: Aug 2002
Posts: 3,680
Mein Auto: HP2Sport - R1200GS - F30
Originally Posted by White05X3 View Post
Sergio - welcome to the world of FI! In boosted motors the 100 octane does more good than it did in your e46. Turbo motors generate a ton more heat and are more likely to detonate. So regardless of whether the car is tuned or not, I always run as much 100 as possible during our schools. It is critical to keep these motors away from the threshold of detonation during prolonged WOT sessions. The 100 doesn't add power, it simply helps keep the motor happy and safe.

When you drove my car it was about 2/3 100, 1/3 91.
Yeah, my concerns with the lead levels aren't related to the engine itself... but to the emissions system. High lead levels can damage catalytic converters. I don't know if modern cats are more/or less sensitive than those of 15 years ago. FWIW even with the countless track days on my E46 (and almost at 200k on the odo) it still passed emissions so I guess all that 100 octane 'unleaded' didn't do much if any damage, just not sure how sensitive the new cats are to this.
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