[Booher]

Hey guys, I have another question for you all. I just got a drum of ignite red which is e90, after I bought it, someone told me e85 gives more horsepower than the e90, but had a hard time explaining it. He gave me the option to trade it in for e85 if I would like. E90 has a higher octane than e85, shouldnt it make more power? E85 is $50 less per drum, would it make more sense to just stay with the e85, or is the extra e5 worth it? On the website it says for na cars and compression of 14 or higher, obviously higher than our cars. I thought worst case, I could cut the e90 with some 91 to bring down the ethanol content. I haven't seen much info about anything higher than e85 anywhere really, so any information on this would greatly help

[Joshinator99]

Very little difference in fuels at that point IMO. Most of the ethanol benefits are in play by E60 anyway. Your fuel system (low side pump, HPFP, and injector size) coupled with modification/HP level will determine how much E you can run safely. No idea what your combo is so cannot comment further on your situation.

[Booher]

I'm just a simple bolt on man with an n/a car. So I shouldn't have a fueling issue at all. /fingers crossed So the cost of the e90 doesnt out weigh its perfomance, and I should just stick with e85 then?

[6spdhyperblue]

Keep the e90

[KingLT1]

It isn't going to make a difference. Octane is for keeping detonation at Bay. You can get all of your timing to reach MBT on E70. Anything above that is just taxing the fuel system harder. If you had really high compression like 13:1, then yes perhaps more Ethanol would be needed.

[Booher]

Alright, I think you guys persuaded me to trade it in for the e85. Thanks as usual, this forum is the best!

[parish8]

I am running 1000+rwhp on pump e70-e85. If you have pump “e85” I would go with that. If you have to buy it by the barrel I would go with the cheapest. I wouldn’t bother sending anything back.

[Booher]

Sounds like that is the general consensus, I'm going to return the 90 for the 85 and save $50. I appreciate everyone's input.

[DorkMissile]

Higher octane actually doesn't make more power. Now it's a loaded statement.

The higher the octane, the higher the resistance to detonation.

If you are optimized on your current tune with your current fuel, change nothing other than the fuel, and higher octane will make less power.

however how you can get power with higher octane if you are in a situation where you can run more timing or cylinder pressure.

I would be cautious with your fuel expert - he doesn't know what he is really talking about. 5% of ethanol content is really splitting hairs as far as how much "better" it is. And on top of it, the E-Content has nothing to do with the octane as you can buy "E85" with octane ratings anywhere between 105, 108 and 110octane.

But so you are aware, for pretty much any street driven engine, you really don't gain much after E60. You can get 80-100hp when going from gas to E60, but you might only gain a HP or two going from E60 to E85. Once you are at E60 you are getting pretty much all the gains to be had. Beyond that you need a lot of compression and/or boost to take advantage of it.

But also understand that one you get past E60, your fuel supply volume really ramps up.

And if you are considering E90, might as well switch it to strait methanol.

[6spdhyperblue]

Why not just cut it with 93

[parish8]

Originally Posted by DorkMissile

And if you are considering E90, might as well switch it to strait methanol.

Methanol is a whole different animal than even e98.

[KingLT1]

Originally Posted by DorkMissile

Higher octane actually doesn't make more power. Now it's a loaded statement.

The higher the octane, the higher the resistance to detonation.

If you are optimized on your current tune with your current fuel, change nothing other than the fuel, and higher octane will make less power.

however how you can get power with higher octane if you are in a situation where you can run more timing or cylinder pressure.

I would be cautious with your fuel expert - he doesn't know what he is really talking about. 5% of ethanol content is really splitting hairs as far as how much "better" it is. And on top of it, the E-Content has nothing to do with the octane as you can buy "E85" with octane ratings anywhere between 105, 108 and 110octane.

But so you are aware, for pretty much any street driven engine, you really don't gain much after E60. You can get 80-100hp when going from gas to E60, but you might only gain a HP or two going from E60 to E85. Once you are at E60 you are getting pretty much all the gains to be had. Beyond that you need a lot of compression and/or boost to take advantage of it.

But also understand that one you get past E60, your fuel supply volume really ramps up.

And if you are considering E90, might as well switch it to strait methanol.

"E85" is labeled generically at the pump. Often times it ranges anywhere from E65 to E80, that is why the Octane varies. So E-content has a lot to do with octane. However It can vary a couple octane points depending on what octane pump fuel it's mixed with.

[JohnE]

Am curious how much and where you bought a barrel of E90 or E85. Up here in Northern Illinois, E85 is cheap. About $2.00 / gallon right now.


I didn't know you could buy it in barrel drum format.


thanks,


John

Originally Posted by Booher

Hey guys, I have another question for you all. I just got a drum of ignite red which is e90, after I bought it, someone told me e85 gives more horsepower than the e90, but had a hard time explaining it. He gave me the option to trade it in for e85 if I would like. E90 has a higher octane than e85, shouldnt it make more power? E85 is $50 less per drum, would it make more sense to just stay with the e85, or is the extra e5 worth it? On the website it says for na cars and compression of 14 or higher, obviously higher than our cars. I thought worst case, I could cut the e90 with some 91 to bring down the ethanol content. I haven't seen much info about anything higher than e85 anywhere really, so any information on this would greatly help

[DorkMissile]

Here - E85 has to be a minimum of 51% ethanol to be called “E85”, but there is actually no regulation on the octane of E85 fuel.

Even with the same Econtent, the octane rating can fluctuate between 100-108 according to the state of MN.

And in comparison between VP, Sunoco and Renegade, their labeling of canned E85 varies between 104-112 octane.

Stuff like this is why I run meth injection on top of E85