Discussion: E85 N/A Performance Gains
#23
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As an aside, I hit the dyno for one last number before I make the switch in a week. Car made 137whp/123tq on 91, however I did notice the duty cycle was showing ~73% near redline. I am starting to question if I need injectors, the most cost efficient would be re-manufactured RX-8 injectors from RockAuto ($130 a set). I may give it a shot without them at first, but it's something to keep my eyes on.
#24
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For those that are interested I took the plunge 2 days ago and made the change to E85. I ordered some GB Manufacturing RX-8 injectors from RockAuto. $155 shipped to my door and they are re-manufactured Denso. Swapped these in, made sure nothing leaked and ran the car nearly dry. Obligatory picture of injectors.
![](https://www.miataturbo.net/attachments/engine-performance-56/98252-discussion-e85-n-performance-gains-11535670786_cc15ebdd48_b.jpg?dateline=1388010749)
After looking like a moron driving my car endlessly around my neighborhood with fuel jugs in the car I got the car nearly sputtering and shut it off. I filled with 5 gallons of E85 and it fired up. I altered my req fuel by changing the stoich number from 14.7 to 9.76 and everything worked fairly well. I got the car drivable and went straight to the E85 pump 5 minutes away and filled the tank up the rest of the way
![](https://www.miataturbo.net/attachments/engine-performance-56/98253-discussion-e85-n-performance-gains-11535665546_df0e00ea76_b.jpg?dateline=1388010749)
For the fuel map I left my AFR targets at 12.8 for my 100kpa rows and left my timing the same. I will be on a dyno within a week or two and from there I'll start playing with a leaner mixture and more timing. I have noticed I need to decrease the cranking pulse in the colder areas, it really sputters at first and doesn't always catch. I attached my map if you care to look at it, I've noticed the injectors are at about 57% duty cycle with the car as it is.
![](https://www.miataturbo.net/attachments/engine-performance-56/98252-discussion-e85-n-performance-gains-11535670786_cc15ebdd48_b.jpg?dateline=1388010749)
After looking like a moron driving my car endlessly around my neighborhood with fuel jugs in the car I got the car nearly sputtering and shut it off. I filled with 5 gallons of E85 and it fired up. I altered my req fuel by changing the stoich number from 14.7 to 9.76 and everything worked fairly well. I got the car drivable and went straight to the E85 pump 5 minutes away and filled the tank up the rest of the way
![](https://www.miataturbo.net/attachments/engine-performance-56/98253-discussion-e85-n-performance-gains-11535665546_df0e00ea76_b.jpg?dateline=1388010749)
For the fuel map I left my AFR targets at 12.8 for my 100kpa rows and left my timing the same. I will be on a dyno within a week or two and from there I'll start playing with a leaner mixture and more timing. I have noticed I need to decrease the cranking pulse in the colder areas, it really sputters at first and doesn't always catch. I attached my map if you care to look at it, I've noticed the injectors are at about 57% duty cycle with the car as it is.
Last edited by Lincoln Logs; 12-26-2013 at 10:30 AM.
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