E85------when does E85 become E70 and back?

[HellPIG]

I think I read that most turn to E70 around this time?

When does it return to full E85? May/June?

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[Mook]

E70 is still more than fine.

But most stations start testing higher again around May from past experience.

 

[willizm]

It depends on the station and what level of ethanol they have still but usually it's around early November I start to see winter blend roll in. If you are tuning for ethanol try to tune for 85% summer blend. This way when 70% ethanol comes in and if you don't have a flex fuel system it will make you run slightly richer because you are commanding a higher percentage of ethanol which has a lower stoich afr.

 

[Mook]

Shut up, Will.

 

[willizm]

Shut up, Will.

 

[Pressure Ratio]

I've posted a chart from the EPA in other threads that shows zones and when winter blend production starts and summer blends start. May is when summer blends start in our area. But not sure when winter blend production starts.

 

[95SC]

I got E85 by my house today , gauge shows 84%

 

[b4black]

It depends on the station and what level of ethanol they have still but usually it's around early November I start to see winter blend roll in. If you are tuning for ethanol try to tune for 85% summer blend. This way when 70% ethanol comes in and if you don't have a flex fuel system it will make you run slightly richer because you are commanding a higher percentage of ethanol which has a lower stoich afr.

Even if you don't have a flex fuel system, the ECM should be able to handle a 15% swing in ethanol and still run at stoichiometric. (Many cars were calibrated for E0, but can easily handle E15 or higher before the LTFTs drift too far).

But at WOT open loop, they will run richer, but also have less octane, so you still need to watch you knock retard closely.

 

[willizm]

Even if you don't have a flex fuel system, the ECM should be able to handle a 15% swing in ethanol and still run at stoichiometric. (Many cars were calibrated for E0, but can easily handle E15 or higher before the LTFTs drift too far).

But at WOT open loop, they will run richer, but also have less octane, so you still need to watch you knock retard closely.

True but most stock tunes are conservative on afr and timing making that swing a little more wide while being plenty safe.

 

[HellPIG]

Yea, the flex tunes are dialed in on Diablo software for our cars yet.....some shops have had great success with HP tuners with it. I'm not changing any pulley setup, just want to run E85 and extra 50-60rwhp if wanted.

What gauge do you guys use to monitor. If I did go this route, I don't want to pull a damn testing kit out at a station.

 

[HellPIG]

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