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Evo 8 stutters and goes lean above 20 psi.All of a sudden.

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Old Jan 29, 2018, 05:40 PM
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Originally Posted by 4b11slayer View Post
0.5 counts. 1 count. 1.5 volts. So it isnt bothering me since knock voltage is like 1.3 at idle..

Ive used the bpr7 and felt sluggish.
.5 is impossible with the stock ECU.

I'm with letsgetthisdone. Gap on the low side for that amount of boost. I can't remember if the CT9A has coil dwell tables defined but that helped my 10 a little too, which has all four COP stock. I run 0.18 on my 10.
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Old Jan 29, 2018, 05:43 PM
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Originally Posted by razorlab View Post
.5 is impossible with the stock ECU.

I'm with letsgetthisdone. Gap on the low sid88e for that amount of boost. I can't remember if the CT9A has coil dwell tables defined but that helped my 10 a little too, which has all four COP stock. I run 0.18 on my 10.
Lol really. It shows 0.5 knock. And 1 count after. Ill have to look at it again. Im not looking at the log. So i may be wrong.

So i shouldnt run the 0.25 gap? I thought go as big as blow out alows?
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Old Jan 29, 2018, 05:54 PM
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felt sluggish, on your coils that I told you were getting tired months ago...
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Old Jan 29, 2018, 06:06 PM
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Originally Posted by letsgetthisdone View Post
felt sluggish, on your coils that I told you were getting tired months ago...
Your right man. Ill throw in some 7s
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Old Jan 29, 2018, 07:19 PM
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ill chime in with some anecdotal experience. I change my plugs every 3k when i do my oil, I use bpr7es and decided to try 8's. I didn't even keep them in for the full 3k, swapped em out at like 1000. The car just felt....less good. Same gap and all that stuff, i have a C.O.P. with S2000 coils, 28psi, e85.
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Old Jan 29, 2018, 07:21 PM
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Originally Posted by Biggiesacks View Post
ill chime in with some anecdotal experience. I change my plugs every 3k when i do my oil, I use bpr7es and decided to try 8's. I didn't even keep them in for the full 3k, swapped em out at like 1000. The car just felt....less good. Same gap and all that stuff, i have a C.O.P. with S2000 coils, 28psi, e85.

Thats crazy i felt the opposite but i had 155k og coils. Ill give it a shot. What gao you run biggie
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Old Jan 29, 2018, 08:33 PM
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I opened them up to a .024 when i did the cop and I had no missfires or issues at all so I left them that way. I did try as large as a .026 and strangely enough i threw a DTC for missfire but it pulled clean. So i took it back down to a .024. Keep in mind i change em every 3k miles so that might contribute to being able to run as much gap. Also my gap tool could just be off so my advice would be to try a few different gaps and feel em out.
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Old Jan 29, 2018, 08:58 PM
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Originally Posted by Biggiesacks View Post
I opened them up to a .024 when i did the cop and I had no missfires or issues at all so I left them that way. I did try as large as a .026 and strangely enough i threw a DTC for missfire but it pulled clean. So i took it back down to a .024. Keep in mind i change em every 3k miles so that might contribute to being able to run as much gap. Also my gap tool could just be off so my advice would be to try a few different gaps and feel em out.
Same here man i replace my plugs every oil change as well. I used a feeler guage to gap it. It aint no half dollar autozone gapper.
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Old Jan 30, 2018, 07:34 AM
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The goal of spark plugs is to run the hottest one that works. Too cold of a plug doesn't retain enough heat, and THAT will make the car feel sluggish because it won't ignite the charge as well, it can cause a rough idle and drivability complaints. Conversely, too hot of plug will retain to much heat- and at WOT/high load conditions may cause knock, predet, or just melt, which is also bad.


It's sort of like ignition timing, you need to find the happy medium. Too much and too little both have their down falls.
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Old Jan 30, 2018, 07:55 AM
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Yah, just like all tuning its about finding out what works best in your setup. Im actually tempted to try going a half step hotter which i think would be br7es? Just to see how that behaves. Its why i went colder, just to see how it liked it. Im sure at some point compression becomes a factor too, like running aftermarket pistons and raising the ratio probably has some effect on this.
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Old Jan 30, 2018, 08:02 AM
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Cool ill gove some br7es a shot. Also try bpr7es. Thanks fellas
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