E85 swap on a 97 Cobra

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E85 swap on a 97 Cobra

Unread postby GT_Rich » Thu Sep 06, 2018 11:44 am

I have a ’97 Cobra driveline in an old Mercury Comet that I’ve been running for the past couple years. It’s an autocross car and I’m looking for a little bit more power without adding weight or spending much money. I have decided to give E85 a shot. I swapped out the old 24’s for a new set of 60 lb/hr injectors. I cleaned up the gas tune and I’m ready to drain and fill with E85. I have a good handle on what I need to do for steady state fuel and spark. Are there any transient changes that typically need to occur? Anyone have a template or standard procedure for this? Thanks!
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Re: E85 swap on a 97 Cobra

Unread postby decipha » Thu Sep 06, 2018 3:46 pm

simply set the stoich afr to your e85 value

kick up the cranking pw 25%

subtract 0.05 lambda from the fuel table in enrichment

shoot mbt spark to it in your case 27 degrees same youd shoot to it with premium fuel
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Re: E85 swap on a 97 Cobra

Unread postby SlowBox » Fri Sep 07, 2018 7:17 am

I didn't notice any changes in transient requirements when I used it in my fox. Biggest thing was actually idle spark as odd as that sounds.
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