E85 L67 fuel economy

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vlad01
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Re: E85 L67 fuel economy

Post by vlad01 »

Wade wrote:Sorry to change the subject. What’s involved in changing to e85? Fuel pumps, injectors, filter, fuel lines and change the fuelling by around 25% ect?
Its actually 50.5 % more fuel for exactly E85.

I see a lot of people stating around that 30% mark which I can't seem to figure out where that number comes from.
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Re: E85 L67 fuel economy

Post by Wade »

krusty wrote:
Wade wrote:I’m finding that I’m really knock limited with pulp 98 and by the time I remove timing the car runs like a pig around 3000 to 4000rpm
Using E85 to cover knock without a dyno to monitor torque gained/ loss is not a great idea. Feed back of 98 on road tune/ log is a handy thing.

Remember that the more efeccient a cylinder is, the less timing it will use most of the time so probably means you need to run less timing and more boost :thumbup:
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Re: E85 L67 fuel economy

Post by dusto »

you use about 1/3 less petrol then E85, i think thats where the 30% comes from, the maths works back to 1.5 times the amount of petrol roughly
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Re: E85 L67 fuel economy

Post by Wade »

vlad01 wrote:
Wade wrote:Sorry to change the subject. What’s involved in changing to e85? Fuel pumps, injectors, filter, fuel lines and change the fuelling by around 25% ect?
Its actually 50.5 % more fuel for exactly E85.

I see a lot of people stating around that 30% mark which I can't seem to figure out where that number comes from.
I was just taking a wild guess. I’ve never tuned or ran e85. So it’s all new to me.
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Re: E85 L67 fuel economy

Post by Wade »

dusto
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Re: E85 L67 fuel economy

Post by dusto »

9.8 stoich

14.7 Stoich


9.8 * 1.505 = 14.75 pretty close there, thats how i adjusted all my tables
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Re: E85 L67 fuel economy

Post by vlad01 »

yeah stoich E85 is about 9.76:1 give or take, most round to 9.8 and call it done.

I have done plenty of testing on E85 on the dyno and checked this against calculated/adjusted tables vs actual WB lambda and its pretty spot on, actually slightly leaner as E85 is more often E90 from united, its within 2% so well within the margin of error on the equipment and hardware.
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Re: E85 L67 fuel economy

Post by dusto »

so maybe better to aim for 9.7 stoich with united?
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Re: E85 L67 fuel economy

Post by vlad01 »

yeah you can but its pretty forgiving either direction without any noticeable change to power output or timing requirements
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.
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