Full e85 tune

Ozzy8690

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Hey guys, I wanted to see what the general consensus was on a full e85 tune on the stock turbo. I have a track day coming up and I wanted to run a custom e85 tune mainly for its cooling properties. But I’m at a crossroads in regards to the reliability of going full e85. At first, it seemed that full e85 was not achievable on the stock fuel system without cutting power or running lean, but then from searches, several tuners have indicated that e85 can be done and was done it just didn’t give the most power as opposed to an e50 blend. So essentially what I want to gather is if a full e85 tune is safe on the stock fuel system with the stock turbo.




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I haven't seen any issues with running full E85. In the early days people just didn't understand how to manage this ECU, and still many people are struggling to figure things out such as fueling and airflow control. The only unknown is if the pumps and everything are going to be 100% fine fater some time. I have about 10k miles on E50 my self and haven't had any issues.

Full E85 can be done but the torque decrease down low is significant. The power is more linear. Dropping to E50-60 gives a decent increase in the low / mid range. I did this way back but found a 50/50 mix was more valued for the power to me personally. But that being said I don't mind doing a custom full E85 tune for people.
 
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Ozzy8690

Ozzy8690

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I haven't seen any issues with running full E85. In the early days people just didn't understand how to manage this ECU, and still many people are struggling to figure things out such as fueling and airflow control. The only unknown is if the pumps and everything are going to be 100% fine fater some time. I have about 10k miles on E50 my self and haven't had any issues.

Full E85 can be done but the torque decrease down low is significant. The power is more linear. Dropping to E50-60 gives a decent increase in the low / mid range. I did this way back but found a 50/50 mix was more valued for the power to me personally. But that being said I don't mind doing a custom full E85 tune for people.
Thank you Marin I appreciate the insight. So with your expertise, a full e85 tune would be safe (relatively) at the track?
 

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Thank you Marin I appreciate the insight. So with your expertise, a full e85 tune would be safe (relatively) at the track?
I can’t say for sure it’s 100% safe on the components. But full e85 with a tuner that knows what they are doing will not lean out.
 

65sohc

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To my understanding the biggest potential drawback of a full e85 tune is that you are running at the absolute limit of the fuel system. For that reason I think tuners dial back the power a bit to add a little bit of insurance against running lean. With e50 there is plenty of headroom with respect to fuel supply so the tune can be more aggressive. I am also guessing that the difference in cooling between e50 and e85 would be small and outweighed by the greater safety margin of fuel.
 

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Correct. Except there isnt a ton of headroom at E50. But this cars ECU/DME has very good conrol so its easier to push closer to the edge ad have it ride it.

As for cooling after about E40 on a DI engine the benefit of the spray is limited. The additional reduced thermal properties from 50->85% are minimal.

There are ways to run full e85 and optimally use the turbo but none of them are cheap. A lot of folks have been using meth for example lately. And it works but the spray doesnt evenly hit all six cylinders and doesn't mix as evenly as a DI firing program.
 

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