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Old 10-20-2018, 05:26 AM   #23
vwengineer
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That's right as I noted with 40% E85 the LTFT goes up to ~13%, so yes your mileage is a bit reduced, so without a tune if E85 does not come at a 30% discount it does not make sense (also taking into account that 98 RON is about 5% more expensive than 95).

The reason why you don't go to E85 directly is because of the higher fueling requirements? As I understood methanol injection can be unreliable sometimes?
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Old 10-20-2018, 03:25 PM   #24
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Quote:
Originally Posted by vwengineer View Post
That's right as I noted with 40% E85 the LTFT goes up to ~13%, so yes your mileage is a bit reduced, so without a tune if E85 does not come at a 30% discount it does not make sense (also taking into account that 98 RON is about 5% more expensive than 95).

The reason why you don't go to E85 directly is because of the higher fueling requirements? As I understood methanol injection can be unreliable sometimes?

No, mostly availability of E85 in my area. Only one brand of fueling station is currently carrying it at some of their locations in my area. Also I have used water meth quite successfully over the last 18 years on a number of forced induction cars so I am comfortable with it. E85 would be all new area to learn about for me.
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Old 10-21-2018, 04:06 PM   #25
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Ok I get it. I think it's also complicated to use E85 in big turbos setup because you need that much fuel. You cannot even do a stage 1 on E85 without replacing the HPFP so I think you are quickly limited in power even with bigger injectors and an upgraded HPFP.
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