e50 vs 85

[Turbolag87]

Maybe I wasn't clear. Just because you can see all the timing on a dyno run by E50, doesn't mean there's no spare capacity for knock resistance on the street in heat soaked conditions.

I can personally watch my knock retard and when the fuel is E70 or below, the car will bury at -6 when cruising on even a slight incline to maintain cruise speed. It pulls less timing when it's E80+.

The benefits are more than just how much peak power you can see with borderline knock. E85 will be much more compliant with real world conditions when the ambients are hotter, the IAT's are elevated and the cylinder head temps are elevated. That translates into REAL world power because it's less likely to go into knock and less likely to pull timing.

Methanol is even better, but with more severe drawbacks.

I don't really see the point in intentionally shorting to E50 unless you're homebrewing out of a canister. If you've already had the hassle of finding an E85 station, I'm not sure what's to be gained by cutting it with 93.

The THERMAL advantages are still there and will help in reducing preignition and detonation and knock.

Thats exactly why... I live in Toronto Canada area and we dont have e85 pumps. So im just gonna order drums of e98.

I was just curious on the difference cause I drive the car alot. I'll probably end up getting 4 tunes.

94
100 boostane
e50
Party Mode e85r


I love hearing different opinions

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[engineermike]

I don’t speak paxtonese….how much boost is that?

 

[Angrey]

Thats exactly why... I live in Toronto Canada area and we dont have e85 pumps. So im just gonna order drums of e98.

I was just curious on the difference cause I drive the car alot. I'll probably end up getting 4 tunes.

94
100 boostane
e50
Party Mode e85r


I love hearing different opinions

I would love to run 98. My first concern would be cost (compared to E85 as an alternative at around $3.50 gallon). The second would be long(er) term storage. Ethanol is highly hydrophilic. I suppose if the drum can stand up to temp/pressure swings you could keep it desecated by simply keeping it closed system.

Truth be told, I'd love to run nitromethane. At $100/gallon is just not practical.

 

[cbrtrx]

E98 mixed 50/50 with 93 octane with 10 percent ethanol is around E53 and equivalent to about 102 octane while still having the benefits of ethanol. That fuel mix would work very well with that setup if tuned properly. I know this from experience. The extra gain to full pump E85 on that particular setup would be marginal.

 

[Deleted member 72210]

Define significant.

20hp at stock power levels is a decent gain. 20hp at 1000+ is pretty insignificant.

Yes, insignificant with people today and how horribly bad drivers they are.. That's why the manual transmission is dying, people just can't drive.

 

[Turbolag87]

E98 mixed 50/50 with 93 octane with 10 percent ethanol is around E53 and equivalent to about 102 octane while still having the benefits of ethanol. That fuel mix would work very well with that setup if tuned properly. I know this from experience. The extra gain to full pump E85 on that particular setup would be marginal.

wow thanks for teaching me something

 

[Turbolag87]

I don’t speak paxtonese….how much boost is that?

3.6 = 10psi

 

[engineermike]

3.6 = 10psi

Honestly at 10 psi there’s not a ton of power benefit going to e-anything. Something like a xdi gdi pump would allow near-mbt timing on pump gas. Most likely there would be almost no advantage going from about e30-40 to e85+ because you’d be running mbt either way.

 

[Turbolag87]

Honestly at 10 psi there’s not a ton of power benefit going to e-anything. Something like a xdi gdi pump would allow near-mbt timing on pump gas. Most likely there would be almost no advantage going from about e30-40 to e85+ because you’d be running mbt either way.

like i said gonna pulley down by seasons end. Most likely end up with 3.33 pulley.

 

[engineermike]

like i said gonna pulley down by seasons end. Most likely end up with 3.33 pulley.

…and how much boost is that?

 

[Turbolag87]

…and how much boost is that?

14 ish-15 psi im assuming

 

[Joshinator99]

14 ish-15 psi im assuming

Definitely worth running E.

 

[engineermike]

To be clear, the lower the boost the less benefit of ethanol. 10 psi is rather conservative and certainly doesn't need E98 to achieve MBT. I'm guessing around E30 would be "enough" but a little safety factor doesn't hurt. At 15 psi, the benefits are greater, but I still don't believe 85-98 is totally necessary. 60-70 would probably be "sufficient", and oftentimes pump E85 is in this range (E51 minimum). Also keep in mind that the fuel system and consumption rate is significantly higher at 98 than 60.

 

[dukecrazy]

To be clear, the lower the boost the less benefit of ethanol. 10 psi is rather conservative and certainly doesn't need E98 to achieve MBT. I'm guessing around E30 would be "enough" but a little safety factor doesn't hurt. At 15 psi, the benefits are greater, but I still don't believe 85-98 is totally necessary. 60-70 would probably be "sufficient", and oftentimes pump E85 is in this range (E51 minimum). Also keep in mind that the fuel system and consumption rate is significantly higher at 98 than 60.

Sorry to jump in here, but my question somewhat ties into the OP's question. I've been trying to find good answers on benefits/drawbacks to running what I consider to be a minimum E rating(E30) vs upgrading the fuel system and running E85(even though the only pump E near me tests at E68-E70) vs running 93 + 4-6oz of boostane professional. I have very limited access to E (1 station within 50 miles) so I'd have to store E regardless of E30 or E85. My mods are listed in my signature for reference.

 

[engineermike]

If e85 was 50 miles away I would focus on maximizing performance on 93.

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