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Old 02-28-2013, 12:44 PM   #3678
absubie
Scooby Newbie
 
Member#: 196235
Join Date: Dec 2008
Chapter/Region: South East
Location: North Georgia
Vehicle:
2004 WRX
JBP

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As I understand, it's all about knock threshold and resistance to detonation. Tuning for E85 allows for much more timing advance. I believe due to its high octane rating. I'm sure someone else can expound on this further.
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