Ppl running full e85???

[Shadows_mkv]

So im seeing a couple people running Full E85, without port injection and without a upgraded fuel system such as lpfp or hpfp.

all they have is a flex fuel kit and flex fuel tune.

how safe is this for the stock fuel system? Disregard the power gains/loss of full e85, im curious about the fuel system itself

Sponsored

 

[Mason]

No

 

[Rocksandblues]

not safe. lean condition is a function of luck and time.

 

[razorlab]

Safe on system. Safe *if* tuned correctly for it.

You would just make more power with a lower ethanol content. Running full e85 hinders the ability to run a good amount of boost.

 

[andy_nunez]

I fill the tank with 3 gal of e85 and the rest with 93 octane. It feels a little more power and it's safe. My supra is stock.

 

[suicidaleggroll]

I fill the tank with 3 gal of e85 and the rest with 93 octane. It feels a little more power

It’s not, if anything it probably makes less power.

and it's safe.

Debatable. I sure as hell wouldn’t feel comfortable running E30 on a stock tune and relying on the slow, long-term fuel trims to try to fix things for me, but you do you I guess. Either way this has nothing to do with OP’s question.

 

[razorlab]

It’s not, if anything it probably makes less power.


Debatable. I sure as hell wouldn’t feel comfortable running E30 on a stock tune and relying on the slow, long-term fuel trims to try to fix things for me, but you do you I guess. Either way this has nothing to do with OP’s question.

3 gallons to a tank is more like e23. I ran e2X on track last year on stock tune. Logged every session. Perfectly fine. Fuel trims short and long fine. Cleaned up timing pull I was seeing with just 93 so not slower at all.

 

[suicidaleggroll]

3 gallons to a tank is more like e23. I ran e2X on track last year on stock tune. Logged every session. Perfectly fine. Fuel trims short and long fine. Cleaned up timing pull I was seeing with just 93 so not slower at all.

Assuming it’s not completely dry and you’re adding 11 gallons total, 3 gallons of E85 + 8 gallons of E10 is exactly E30. If his “E85” is closer to E60-70 then it would be lower, but that’s a big assumption.

All things being equal (same boost/timing) the car will make less power on ethanol than gas. If the car is pulling timing on gas and ethanol fixes it, then it might make more, but I don’t think thats very common on a stock car on the street. Mine wasn’t pulling timing when stock.

 

[razorlab]

All things being equal (same boost/timing) the car will make less power on ethanol than gas.

Maybe on car from the 90's with no dynamic programming. Either way, it's not suddenly going to make a TON more power but I wouldn't assume it will make less.

 

[racebuild]

Assuming it’s not completely dry and you’re adding 11 gallons total, 3 gallons of E85 + 8 gallons of E10 is exactly E30.

All things being equal (same boost/timing) the car will make less power on ethanol than gas. If the car is pulling timing on gas and ethanol fixes it, then it might make more, but I don’t think thats very common on the stock tune on the street. Mine wasn’t pulling timing when stock.

Could go both ways… most guys don’t test pump content on each fill. Majority of e85 pumps aren’t full e85, I’ve tested some at e56… can’t trust the pump, ever. Users that just wing the calculations without a sensor/gauge are on borrowed time.

 

[Thraxbert]

E50 is what the stock fuel system can handle. Everything above that is gambling.

 

[razorlab]

E50 is what the stock fuel system can handle. Everything above that is gambling.

You can run full E85 if you tune the car correctly. This has been proven many times. Would you make more power with less Ethanol? Yes, because you can run more boost and not just make power on MBT timing.

 

[jRuN]

You can run full E85 if you tune the car correctly. This has been proven many times. Would you make more power with less Ethanol? Yes, because you can run more boost and not just make power on MBT timing.

What is the reasoning behind not being able to run as much boost on E85 ?

 

[razorlab]

What is the reasoning behind not being able to run as much boost on E85 ?

Limit of the stock HPFP. It goes by angle and 126 is max. In simple terms, more boost means more fuel means more HPFP angle and E85 creates higher fuel demands so it all compounds.

Non simple is it’s not just the HPFP at play.

A good trick is to ramp up the boost as there are more fuel demands down low in the rev range. Still won’t be able to support full e85.

 

[jRuN]

Limit of the stock HPFP. It goes by angle and 126 is max. In simple terms, more boost means more fuel means more HPFP angle and E85 creates higher fuel demands so it all compounds.

Non simple is it’s not just the HPFP at play.

A good trick is to ramp up the boost as there are more fuel demands down low in the rev range. Still won’t be able to support full e85.

So to take full advantage of e85 and make the most power from it, we still need - lpfp, hpfp upgrades at a minimum? Or do we also need either port injection or upgraded direct injectors?

Sponsored