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May 16, 2009, 04:44 PM
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#1
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Evolving Member
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Location: santa rosa CA
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E85 from 91oct. Should I close my plug gap some?
Been running BR8ES at .024 and about 22-23psi with no break up. I'll be getting tuned on E85 in a few days and will be changing plugs before hand. With boost going up should I close the gap down some? Maybe 22 or even 20? Also am I good with the 8 heat range plugs?
Mods are full bolt on's and comp 272's on a viii
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May 16, 2009, 09:14 PM
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#2
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Drives: '04 BBY Evo VIII (Gone), '06 GG Evo IX
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I didn't change my plug gap before or after E85 and seems to work fine for me. I'm running the same gap as you as well
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May 16, 2009, 10:17 PM
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#3
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In an Evo8 I suggest copper plugs at 0.020" on E85.
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E85 Hints and Tips
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May 17, 2009, 01:13 AM
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#4
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I had major spark blowout at 26.5-28 gapped down to 20 at 30 psi and no more blowout 
IKH24 one step colder for safe measure
Evo9
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May 17, 2009, 09:43 AM
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#5
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I also had to gap mine down to about .021 running about 28psi. (IX turbo/intake/exhaust/02). I had some serious spark blowout after I initially got tuned. After I regapped my new plugs, the cutting out went away (1-4 gears). However, I still get a bit of cutting out in 5th gear from time to time....
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May 24, 2009, 12:13 AM
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#6
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Drives: 03 EVO8, 05 R6
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Im running .20 gap on 35 psi with e85. The fuel isn't really much of an issue more of how much boost and what ignition system.
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03 Apex silver EVO VIII 12.25@113 1.83 60' @ 4800 ft
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May 24, 2009, 09:54 AM
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#7
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So I got my E85 tune yesterday with my plugs gapped to .022 and it worked great. 30psi peak and no break up.
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May 24, 2009, 12:14 PM
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#8
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I'm still running the BPR7's gapped to .20 on E85 no problems. You shouldn't need BPR8's until turbo upgrade.
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Jun 27, 2009, 10:09 AM
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#9
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If you're on the edge of misfiring now, then E85 will push you over. I'd go with NGK copper 7's and work your way down on the gap until it pulls cleanly.
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Jun 27, 2009, 10:20 AM
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#10
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very interesting i didnt know that about misfiring issue. im tuned on e85 and still using bpr7s and gap still 24 hhmm , so you guys are saying .020 or .021 maybe better?
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Jun 27, 2009, 01:23 PM
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#11
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Quote:
Originally Posted by twabtoxer
very interesting i didnt know that about misfiring issue. im tuned on e85 and still using bpr7s and gap still 24 hhmm , so you guys are saying .020 or .021 maybe better?
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If you're tuned on E85 and running .024" without misfiring then you should leave the plugs alone. The only time you should close the gap down is when you begin misfiring. Running too tight a gap will hurt driveability, fuel mileage, etc..
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Jun 27, 2009, 06:09 PM
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#12
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Quote:
Originally Posted by NewLondon
If you're tuned on E85 and running .024" without misfiring then you should leave the plugs alone. The only time you should close the gap down is when you begin misfiring. Running too tight a gap will hurt driveability, fuel mileage, etc..
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thanks for the heads up
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Jul 10, 2009, 11:29 AM
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#13
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Location: Arlington Heights
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Drives: 2006 EVO IX MR
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Investing in an ignition system wouldn't be a bad idea. E85 can be hard to ignite.
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AEM EMS Tuner
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