How to correctly setup the ecu to run e85

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Mobne_s13
Posts: 277
Joined: Sun May 25, 2008 8:56 pm

How to correctly setup the ecu to run e85

Postby Mobne_s13 » Fri Aug 10, 2018 8:39 am

I need some backup in setings for e85 fuel.

At the moment, in setup/fuel

tuning method - VE
fuel type - ethanol petrol blend
percent of ethanol 85%
fuel load type - throttle possition sensor
fuel pressure input - map reference
Base fuel pressure - 300kpa


With the setting 85% blend im locked in the fuel composition scalar table at 85% value 92.

Should fuel composition correction be used? What value?

Also, i run fuel pressure sensor. Does haltech read the fuelpressure from it and calculate ve from that? Or is the 300kpa i enter in the setup doing it? Or is it just for engine protection settings?

Can anyone confirm this is the way to go with e85? I have been told pump e85 often is of less quality and you can expect anything between 75-85.
This alone can be a source for incorrect ve values.

Please help.

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HaltechMatthew
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Location: Sydney, Australia
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Re: How to correctly setup the ecu to run e85

Postby HaltechMatthew » Wed Aug 22, 2018 12:22 pm

You should be using a flex sensor unless you are using fuel from a known origin. But otherwise you have done it correctly by selecting Ethanol Blend with 85%.

The base pressure is only used for engine protection, it does not impact the tune in any way.

When you have a fuel pressure sensor it is a good idea to map your injector flow rate against injector pressure differential. This will then correct for changes in injector tip pressure.

Flat_Rate
Posts: 92
Joined: Wed Jan 20, 2010 12:57 pm

Re: How to correctly setup the ecu to run e85

Postby Flat_Rate » Wed Aug 22, 2018 12:34 pm

i mapped the main fuel map in 4D... seems to work well

Mobne_s13
Posts: 277
Joined: Sun May 25, 2008 8:56 pm

Re: How to correctly setup the ecu to run e85

Postby Mobne_s13 » Wed Aug 22, 2018 9:48 pm

Could you possible explain how it’s done practical?

Can I activate the injector flow against fuel pressure or do I have to set this up with a generic table?

I have a injector flow bench, so I can get really good injector data on different flows.

I have ordered a flex sensor also, it’s a continental sensor which reads temp and ethanol content. Looks the same as the ones you sell.

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HaltechMatthew
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Re: How to correctly setup the ecu to run e85

Postby HaltechMatthew » Wed Oct 24, 2018 10:54 am

Injector flow is mapped against injector pressure differential, you cannot map it against fuel pressure because you have manifold pressure that influences the pressure at the pintle where the fuel comes out.


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