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Old 10-24-2012, 10:39 AM   #6576
jnorth85
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Quote:
Originally Posted by Jdub.csu

Ah so lower miles then but hard miles Conservative E85 tune I assume?
We chose to make power with boost instead of timing to save the motor. I'm at 17* of timing and 26psi its not a weak tune but far from agressive. I plan on building a motor so I can get more agressive. As far as mileage I've driven about 3-5k with it at this level with hard driving.
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Old 10-24-2012, 10:40 AM   #6577
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depending on the dyno being used, if he is making the kind of power he says he is, it isn't going to be a conservative tune.
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Old 10-25-2012, 11:37 AM   #6578
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I've been looking into running e85 but i just was wondering what everyone seems to avg. on their dd for gas mileage?
I think I'm just going to do a TBE, 1200cc or so injectors, and upgraded pump, along with a protune very conservative tune,and a mild tune.
Just food for thought.
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Old 10-25-2012, 11:50 AM   #6579
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Quote:
Originally Posted by Chuck2012
I've been looking into running e85 but i just was wondering what everyone seems to avg. on their dd for gas mileage?
I think I'm just going to do a TBE, 1200cc or so injectors, and upgraded pump, along with a protune very conservative tune,and a mild tune.
Just food for thought.
It just depends. My buddies bugeye still got 20. I was down at 14 with my 06 sti before my motor build and bigger turbo. Once I'm in the freeway I get to 65 and cruise and I'm getting around 18 now.
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Old 10-25-2012, 12:03 PM   #6580
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Originally Posted by ryanveld

It just depends. My buddies bugeye still got 20. I was down at 14 with my 06 sti before my motor build and bigger turbo. Once I'm in the freeway I get to 65 and cruise and I'm getting around 18 now.
That's really the only thing I'm worried about. I get an avg of 23ish now on 93 stock and I avg about 400 or so miles a week or more. So gas mileage does a have an effect on my decision. But I'd be interested to see what others have to say.
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Old 10-25-2012, 12:13 PM   #6581
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I have a walbro 300, IDE 1000cc, and about 420 WHP at 24psi. Normally, I average about 17 mpg on E85 about 50/50 hwy and city driving. Driving hard, it has gone as low as 14 mpg for a tank of fuel.

I have not run this setup on gasoline, so i have no numbers there to compare it to.
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Old 10-25-2012, 12:16 PM   #6582
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Quote:
Originally Posted by Chuck2012 View Post
That's really the only thing I'm worried about. I get an avg of 23ish now on 93 stock and I avg about 400 or so miles a week or more. So gas mileage does a have an effect on my decision. But I'd be interested to see what others have to say.
I'm getting around 220-240 on a tank of fuel. I can't see any way you will get close to 300-400 miles to a tank of E85.
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Old 10-25-2012, 12:50 PM   #6583
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My numbers are close to others here. 16-17 in mostly mixed driving. If it's all highway (read 75-80mph) I'ts 19 or better. I've never tried to see how much I could manage out of it. 220-250 on a tank is about avg.
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Old 10-25-2012, 01:29 PM   #6584
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Quote:
Originally Posted by Squidz

I'm getting around 220-240 on a tank of fuel. I can't see any way you will get close to 300-400 miles to a tank of E85.

I didn't expect that at all. I get around 230 miles per a tank now but I never push the last quarter of the tank.
I just really want around a solid 300whp reliable DD with the mods I posted above if that's doable. That does get horrible gas mileage.
Does that sound right or am I dreaming?
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Old 10-25-2012, 01:31 PM   #6585
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my 500whp bugeye was getting 17-18mpg in mixed city and highway driving on 93oct, and it was getting 16-17mpg in mixed city and highway driving on E85. on the interstate, with cruise control set at 80mph, it got 23-24mpg on 93oct and 22-23mpg on E85.


the drop in mpg will vary so much depending on tuning style, driving style, location, etc that it would be really hard for you to get a good idea as to what your personal mpg will turn out to be without actually trying it. for example, I have a few people that have seen ZERO drop in mpg on pretty much stock setups, but then others I have tuned on pretty much stock setups have told me they dropped ALOT.
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Old 10-25-2012, 03:07 PM   #6586
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Quote:
Originally Posted by amalgrover
my 500whp bugeye was getting 17-18mpg in mixed city and highway driving on 93oct, and it was getting 16-17mpg in mixed city and highway driving on E85. on the interstate, with cruise control set at 80mph, it got 23-24mpg on 93oct and 22-23mpg on E85.

the drop in mpg will vary so much depending on tuning style, driving style, location, etc that it would be really hard for you to get a good idea as to what your personal mpg will turn out to be without actually trying it. for example, I have a few people that have seen ZERO drop in mpg on pretty much stock setups, but then others I have tuned on pretty much stock setups have told me they dropped ALOT.
This^ here's my .02. I have a 10'wrx headers,dp, injectors,fp obviously on 85. On the highway Im getting an average of 260 per tank ( straight hwy), on mixed Im getting 220. Car is at 360whp and in crappy hot /humid Miami. Prior to this on my 93 map i was getting 325 hwy and 280 mixed.
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Old 10-25-2012, 03:17 PM   #6587
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I think the cost difference for E85 and the lower mpg about equals out. So in the end you just get more horsepower

A heck of a lot better deal than paying $8/gallon for race gas...
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Old 10-25-2012, 04:08 PM   #6588
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sometimes...its a percentage; so as long as the price spread is greater than the mpg difference percentage, E85 wins out.


...for example, until premium got above $4/gallon and the price spread dropped below $0.40/gallon, it was cheaper for me to run E85 than 93oct, even with the mpg loss.





IMO, i agree that E85 will always win when comparing it to racegas
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Old 10-25-2012, 04:21 PM   #6589
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Well thanks for helping. Eventually I will be apart of the E85 army. Hopefully by the spring ill have enough tucked away to start buying parts an Ill probably go to Cobb Plano. Also should have a nice oh sh@t fund built up by then too.
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Old 10-25-2012, 05:55 PM   #6590
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anyone make the switch to E85 without changing much else?

interested in how much it improves spool.
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Old 10-25-2012, 06:48 PM   #6591
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Quote:
Originally Posted by vicious_fishes View Post
anyone make the switch to E85 without changing much else?

interested in how much it improves spool.
Recently switched a 20G from pump to E85. I didn't compare boost plots back to back, but I don't think it effected spool itself all that much really. The physical characteristics of the turbine wheel are obviously the biggest factor there. Anyways, not my area of expertise, but what I can tell you is that we cranked up the boost and timing. That is where we got a majority of our gains. More power, more torque, more smiles
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Old 10-25-2012, 07:46 PM   #6592
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Quote:
Originally Posted by vicious_fishes
anyone make the switch to E85 without changing much else?

interested in how much it improves spool.
You will see better spool because E85 has a higher density burn i can feel quite a difference with my fp green vs 93oct.
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Old 10-25-2012, 08:28 PM   #6593
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Quote:
Originally Posted by mecpgh View Post
You will see better spool because E85 has a higher density burn i can feel quite a difference with my fp green vs 93oct.
Would be interesting to see back to back boost plots of the same exact setup running pump vs E85. Anybody have one?
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Old 10-25-2012, 09:01 PM   #6594
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Quote:
Originally Posted by Juks

Would be interesting to see back to back boost plots of the same exact setup running pump vs E85. Anybody have one?
Wish I did. My 91 map is 19.5 with my E85 being 24. But when I switch to I mode, it's only hitting 20. And we never did I pull on the dyno is I mode. But we're assuming its around the 400wtq mark.
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Old 10-25-2012, 09:03 PM   #6595
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Quote:
Originally Posted by vicious_fishes View Post
anyone make the switch to E85 without changing much else?

interested in how much it improves spool.
Go to:

http://accessecu.com/dyno

or

http://www.efilogics.com/dyno/

Type 'Subaru E85' into the search.

There you go, dozens of E85 vs. pump comparisons on the same car / same dyno / same tuner. Some will even be same day.
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Old 10-25-2012, 09:19 PM   #6596
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Quote:
Originally Posted by mecpgh View Post
You will see better spool because E85 has a higher density burn i can feel quite a difference with my fp green vs 93oct.
Quote:
Originally Posted by Juks View Post
Would be interesting to see back to back boost plots of the same exact setup running pump vs E85. Anybody have one?
this. i'd LOVE to see the difference!
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Old 10-25-2012, 09:35 PM   #6597
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Quote:
Originally Posted by vicious_fishes

this. i'd LOVE to see the difference!
Its enough for me to hate running 93 because the car is much less responsive in and out of boost, but i am running am aggressive timing map on both fuels... because i can!
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Old 10-25-2012, 10:26 PM   #6598
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Quote:
Originally Posted by Concillian View Post
Go to:

http://accessecu.com/dyno

or

http://www.efilogics.com/dyno/

Type 'Subaru E85' into the search.

There you go, dozens of E85 vs. pump comparisons on the same car / same dyno / same tuner. Some will even be same day.
Very cool, I've seen this but never actually tried it. Thanks.

Here's a stock turbo comparison. Boost curve looks the same except it just goes higher with E85.

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Old 10-26-2012, 08:17 AM   #6599
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I'd pretty much agree. I didn't see much change in spool. Maybe a little. More that I got way more torque. Here's one of my old Virtual Dyno plots. There may have been other changes between Stage 2 and E85. It was not back to back in my case.

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Old 10-26-2012, 03:33 PM   #6600
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Quote:
Originally Posted by Maxwell Power View Post
There is a turbocharged BRZ making 400whp on e85.
It is 12.5:1 compression, direct injected.
Was more talking about E85 specific engines... that cannot run on pump due to octane requirements.

E85 conversions take advantage of the octane for power, I'm more talking OEM applications that would balance the extra octane for power and fuel economy... think a stock 2.5L WRX powerband from a 1.8 or 2.0L that gets a real world ~35 MPG... that kind of thing.

You know how all these people in college talk about the SAE Formula team? Yeah, I was one of those wierdos on the SAE high mileage vehicle team. I'm an odd duck.
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