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Forum name	Performance/Engine
Topic subject	retard spark 15psi or E85 with 10psi.
Topic URL	http://forums.2gnt.com/dcboard.php?az=show_topic&forum=5&topic_id=136742&mesg_id=136742
136742, retard spark 15psi or E85 with 10psi. Posted by freakingbori617, Dec-31-69 06:00 PM Ok so my 10:1 build is alot more knock limited than I thought. At 10psi Im already around 3degrees BTDC. I am running RC 550cc injectros and wanted to know if I could run E85 I read accouple forums where people have done so but not exactly sure. So my question is should I retard the spark and run 15 psi or will I be better off stuck at 10psi with E85?

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