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Backfiring when shifting and getting into boost, help?

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Old Aug 28, 2006, 06:20 PM
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Originally Posted by sleet
Should I try out 7's or 8's for the new plugs?
8's all the way
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Old Aug 28, 2006, 06:32 PM
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The NGK BR8EIX is a really nice plug. I get a super smooth powerband with them gapped at .027
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Old Aug 28, 2006, 06:38 PM
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Isnt .027 a little high on stock ignition?
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Old Aug 28, 2006, 06:47 PM
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The stock plugs call for a gap around .029-.033 if I remember correctly so considering you're just going one step colder and keeping an iridium plug with the BR8EIX I see no problem with .027. It's always worked very well in my Evo.
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Old Aug 28, 2006, 07:38 PM
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So what should I gap them at? I really hope this solves the problem.
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Old Aug 28, 2006, 07:43 PM
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Go with the 8s and I gap mine to .026.
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Old Aug 29, 2006, 02:53 PM
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K, i'll probally pick them up tomorrow.
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Old Aug 29, 2006, 03:56 PM
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Originally Posted by mitsuorder
The NGK BR8EIX is a really nice plug. I get a super smooth powerband with them gapped at .027
I got the 7 equivalent (BR7EIX) and I will never use copper NGK's ever again. Spraying W/M on them at 25 psi gapped to 0.025 with stock coils and haven't had any misfires, fouling, or whatnot.

Have you checked your afrs lately?
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Old Aug 29, 2006, 04:38 PM
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Not saying this is the problem on your car for sure but I had the same problem and it was my BOV. It wasn't closing fast enough / lagging open and would cause rich spikes and backfire right when getting on the gas after a shift.

Swapped the plugs, swapped wires, still there. Swapped BOV, went away.
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Old Aug 29, 2006, 06:49 PM
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Originally Posted by razorlab
Not saying this is the problem on your car for sure but I had the same problem and it was my BOV. It wasn't closing fast enough / lagging open and would cause rich spikes and backfire right when getting on the gas after a shift.

Swapped the plugs, swapped wires, still there. Swapped BOV, went away.
Would a stiffer spring close it faster? I'm going to check for the exhaust leak first, then change plugs, then mess around for a boost leak and such. Hopefully i'll find a tactrix cable so I can get some logs aswell.
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Old Sep 8, 2006, 09:14 AM
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Ok so I re-gapped my plugs down to .22-.23 and now the car doesn't backfire at 7k anymore, only when I shift at 7.5k.
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Old Sep 8, 2006, 09:36 AM
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If you replace your wires and your coil boots you will most likely be able to retain the higher plug gap and the benefits of the hotter spark.
Last edited by mitsuorder; Sep 8, 2006 at 09:46 AM.
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Old Sep 8, 2006, 01:41 PM
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Right now I put in new BPR7ES with a .23ish gap. I also tried to put the stock BOV back on just to see, still did it.
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Old Oct 6, 2006, 12:52 PM
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that gap size is pretty small try 26
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Old Oct 7, 2006, 07:30 PM
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ya .26 is real nice.
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