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Old 04-06-2012, 11:59 AM   #1
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Figure I'd try here first hoping you guys tested e85 more then just "I think"....


Im having my truck tuned next weekend and wondering what other tweaks I can/should do before hand. I'm gonna have it tuned on e85 so I'm wondering if a better plug runs better with e85 or not. Everyone with ls1's use ngk tr-55's but does e85 like a hotter or colder plug or doesn't matter? My truck is a 2011 silvo with a 5.3 with CAI, modded air box and catback with a xr-1 muffler.
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Old 04-06-2012, 03:48 PM   #2
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i dont run e85 so done quote me on this but i dont think you will see much improvement with e85 with such a mild modded vehicle. i think it would be more trouble finding fuel all the time than its worth.
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Old 04-06-2012, 05:27 PM   #3
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I am making the switch tomorrow on my ta, mods in sig. I ran it in our stock 07 tahoe and it did nothing except 3 mpg worse gas mileage and do the math its costs you to run it vs regular. Now in a boosted app it will make more power.
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Old 04-06-2012, 06:47 PM   #4
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One of my concerns is the consistency of the E85. Our pumps say a minimum of 13% but make no claim of the maximum amount. And I don't know how much it matters. Have a 393" blown car and I've worked up a tune for E85, but I'm afraid to actually try it at the strip. Just putting around it seems fine on E85. Was surprised how easy it starts.

Al 95 Z28
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Old 04-07-2012, 01:03 PM   #5
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Being up in the north here too, just make sure to check the fuel by batch where you're getting fuel. There's a ton of variance of gas content in the E85 in our northern climates month by month. A few boat racers up here found that out the hard way.
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Old 04-07-2012, 11:07 PM   #6
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I run TR-6 plugs, and I love the E-85 switch, I dont know how close you are to Meijer gas station. They use the same supplier, and ours is good fuel, I have six buddies that run it in various stuff and I run it in all of my vehicles, it will take about four tanks to get it all evened out. I will tell you this, my 07 Tahoe with E-85 and 5.3 will smoke my brother in laws 10 Escalade with the 6.0...
Go for it, you will like it, and the smell is a lot better, plus it is way cleaner...
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Old 04-08-2012, 10:29 AM   #7
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yea iv been on it for a month now so my truck is "used" to it now, i have about 4 stations about 5 mins from me so thats not a problem. But everything iv been reading its been about a 50/50 replys saying go hotter on a plug then go colder so i dunno.
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Old 04-08-2012, 06:35 PM   #8
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According to Mark Sullen, hotter plug.... I would also agree from findings.
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Old 04-11-2012, 04:51 PM   #9
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some food for thought..
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Old 04-12-2012, 11:06 AM   #10
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I use a -7 plug with 13.25:1 compression. I've run colder plugs and it idles cleaner on the -7s.
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Old 04-18-2012, 05:28 PM   #11
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Quote:
Originally Posted by Taubr Unit View Post
some food for thought..
Is that with timing optimized, or is that just the results of a straight up fuel swap?
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Old 04-18-2012, 06:57 PM   #12
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Not exactly sure, I would assume just fuel change and the computer readjusting for it.
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Old 06-13-2012, 03:09 AM   #13
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There is no way the graph above is with timing added
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Old 06-13-2012, 01:48 PM   #14
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Quote:
Originally Posted by Cam72aro View Post
I am making the switch tomorrow on my ta, mods in sig. I ran it in our stock 07 tahoe and it did nothing except 3 mpg worse gas mileage and do the math its costs you to run it vs regular. Now in a boosted app it will make more power.
E85 picks up power on everything and anything over pump 93. The fuel is oxygenated, octane is somewhere in the range of 114 IIRC and burns cooler so your IAT's go down significantly, which all allows you to tune a bit more aggressive. Ive seen significant torque gains on the honda 4cyls aswell, and with SRT4s too.


Edit: Also if you live in a cold place cold starts tend to be worse, but it all depends on the tune.
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Old 06-13-2012, 03:28 PM   #15
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Well I had my tune on e85 but said I could still run 93 if need-be. If that's the case I'm wondering if there's still power to be had on e85?
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Old 06-13-2012, 10:29 PM   #16
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Quote:
Originally Posted by Taubr Unit View Post
Well I had my tune on e85 but said I could still run 93 if need-be. If that's the case I'm wondering if there's still power to be had on e85?
Im not an expert, but in my opinion you have a lot left in it. With E85 your able to get pretty aggressive with the tuning without getting any knock.
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Old 06-14-2012, 10:20 AM   #17
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Just did it on a LS1. (that's what she said). Check it out.

Stock Internal LS1 tuned on E85 and 93. Dyno charts to compare the 2 inside
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