FI on E85
02-26-2009, 09:34 PM
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FI on E85 How many turbo guy are running E85 reliabe? I can't decide if I should go that route. I was told the octane rating is different evey time you go to the pump, so it hard to run a good tune. Anyone have problems running this fuel?
02-26-2009, 10:13 PM
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Im in the same boat as you. I have plenty of stations so it would be easy. I wasnt too happy about buying new injector again and a driver box but thats the FI world for ya.
I have never heard of anyone complaining about it on a fi application.
At about 105 octance and the cooling capabilities it seems a no brainer.
Alex
I have never heard of anyone complaining about it on a fi application.
At about 105 octance and the cooling capabilities it seems a no brainer.
Alex
02-27-2009, 07:03 AM
#3
Since E85 is mandated to be 85% ethanol, I can not see the octane rating varying that much since the major of it is ethanol than that is determining the 'octane' rating. I am sure the 15% of other stuff and affected, but it can not be that drastic. From everything I have read E85 has about the same octane rating as 100 unleaded.
The main reason I have not switched over is that there are few stations here in Denver that carry E85. There is not a single station within 15 miles of my home.
The main reason I have not switched over is that there are few stations here in Denver that carry E85. There is not a single station within 15 miles of my home.
02-27-2009, 07:39 AM
#4
E85 is great fuel... its like about 104 ish but you can tune it like 112-116.. it loves boost and timing and plus i run like 20-30 * cooler with it.. my new motor will be e85 on the street and e98 at the track so 16 160# inj will be needed if i dont stay blow thru...i dont see a 1500rwhp e85 car that hard, seeing a few vipers hit 1800rwhp on it...
02-27-2009, 08:15 AM
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The variance at the pump, can sometimes be attributed to summer and winter blends. They add a little more gasoline in the winter to help cold light off, as E85 gets a little finicky in colder temps. It ends up being closer to E75-80.
Then there are the rumors that some distributors use a sub grade gasoline for blending. I don't know how true that is.....
The ultimate solution, and what I plan to do, is has the blend sensor in the fuel return line to measure the true Ethanol content in your tank. That is how the factory flex fuel vehicles do it.
Then there are the rumors that some distributors use a sub grade gasoline for blending. I don't know how true that is.....
The ultimate solution, and what I plan to do, is has the blend sensor in the fuel return line to measure the true Ethanol content in your tank. That is how the factory flex fuel vehicles do it.
02-27-2009, 10:13 AM
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The variance at the pump, can sometimes be attributed to summer and winter blends. They add a little more gasoline in the winter to help cold light off, as E85 gets a little finicky in colder temps. It ends up being closer to E75-80.
Then there are the rumors that some distributors use a sub grade gasoline for blending. I don't know how true that is.....
The ultimate solution, and what I plan to do, is has the blend sensor in the fuel return line to measure the true Ethanol content in your tank. That is how the factory flex fuel vehicles do it.
Then there are the rumors that some distributors use a sub grade gasoline for blending. I don't know how true that is.....
The ultimate solution, and what I plan to do, is has the blend sensor in the fuel return line to measure the true Ethanol content in your tank. That is how the factory flex fuel vehicles do it.
during the winter you will see e70 cause the car wont start in cold weather with e85,
e70 is around 100.5 oct. and e 85 is around 102 -104 depending on the pump.
so buy 20gallons of winter mix. put it in air tight can and wait till motor is dont. then tune it on that. then no matter what you are safe.
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02-27-2009, 01:20 PM
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I have not found the limit, 9.5 cr and I have logged 21 psi of boost with 24* timing, without any issues. I am still playing with it.
We have run much higher timing and boost on a lower compression LT4 with zero issues.
It is a great cheap boost fuel.
We have run much higher timing and boost on a lower compression LT4 with zero issues.
It is a great cheap boost fuel.
02-27-2009, 03:35 PM
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E85 loves compression. It is very resistant to knock. If you are building a engine with E85 in mind, 9.5 cr, at least, is a great idea. Your off boost throttle response and overall drive ability will be a lot better.
If it were a gasoline engine, then lower cr would give you more room for error.
I stopped at 24*, and did not feel it was worth the risk to keep pushing it. It was picking up power every time we added 2*. I was way rich too, probably low 10's at high boost. I am still dialing it in, I will lean out the AFR a bit, but I probably won't mess with much more timing. Around 1000 hp to the tires now.
If it were a gasoline engine, then lower cr would give you more room for error.
I stopped at 24*, and did not feel it was worth the risk to keep pushing it. It was picking up power every time we added 2*. I was way rich too, probably low 10's at high boost. I am still dialing it in, I will lean out the AFR a bit, but I probably won't mess with much more timing. Around 1000 hp to the tires now.
02-27-2009, 03:39 PM
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so building around boost. and e-85 running 10 cr or 10.5 cr is probly not bad.
now i understand that e85 isnt every where. so should i do two tunes. one for e85 and one for 91. with like no psi. lol
now i understand that e85 isnt every where. so should i do two tunes. one for e85 and one for 91. with like no psi. lol
02-27-2009, 05:20 PM
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I use a 91 octane tune for my motor car when I need to go long range- But I need to take the computer with me some time and see how many freeway only miles I can get on a tank of E85-
Seriously noticing the Winter blend E70- Id hate to have my car boosted right now and not have accounted for the E70 change. ( I dont think it would be that bad but the difference is there )
Seriously noticing the Winter blend E70- Id hate to have my car boosted right now and not have accounted for the E70 change. ( I dont think it would be that bad but the difference is there )
02-28-2009, 06:38 PM
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So, I am planning to do this as well. What are the 400+ CI guys using for injectors and driver box? (I have a 403 CI motor, by the way 
)
This is on my next list of to-do's since I am going through the car again.
)This is on my next list of to-do's since I am going through the car again.
03-31-2009, 09:25 PM
#20
e85 loves the comp. i was about 9.5-1 with 72cc heads now run 64cc heads and it loves it. its like insta spool i have not fine tuned it but i have way more left. i did some real high timing pulls like 28-32 deg at 4-10 psi in break in and it loved the timing with no knock. i will back in down to 15-17 to start when the boost goes to 15-20 soon.... thats if the car willl stay on the road to make the boost.. its real light!!!!!