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Old 08-08-2019, 09:57 AM   #1
JohnnyDrfiter22
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SR20det does not rev past 4k

Hey guys,

I have a fully built sr20 tuned with a AEM v2 and map sensor. It starts up and revs fine until it hits 4k and backfires and will not rev past 4k. Zero boost leaks as I tested it. Any ideas would be appreciated or if you are super familiar with AEM and want to read my data log.

Again AEM v2 with a map sensor.

Thanks
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Old 08-08-2019, 10:14 AM   #2
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Just curious as to if the 2 step was set up incorrectly?
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Old 08-09-2019, 04:28 PM   #3
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Have you checked the coil packs ? Boost leak test ? What about your plug gap and heat range ?
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Old 08-10-2019, 11:34 AM   #4
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Coil packs are good, they have spark. That was my first assumption.

No boost leaks, I bought a tester.

Plugs are BKR7E gapped to .27.
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Old 08-11-2019, 08:17 PM   #5
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Quote:
Originally Posted by JohnnyDrfiter22 View Post
Coil packs are good, they have spark. That was my first assumption.

No boost leaks, I bought a tester.

Plugs are BKR7E gapped to .27.
Spark doesn’t mean they are good. Can you swap with a known good set. Or put yours in a good running car?
Typically failing coils will fire under light load and breakup badly once you start to get under more load
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Old 08-13-2019, 02:14 PM   #6
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That makes sense. I have a few spares. I'll throw them in and see what happens.
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Old 08-16-2019, 05:24 PM   #7
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I changed out the coil packs and no changes. I'm stumped!!
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Old 08-16-2019, 08:53 PM   #8
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Have you checked your tune? No mention of that reply.
Are you map or mf?

Have a great day,
jared
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Old 08-16-2019, 10:18 PM   #9
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what does your wideband read when this happens??
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Old 08-20-2019, 12:38 PM   #10
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How much boost? I remember with stock coil packs, my engine worked better with the copper plugs. As soon as I switched to the ls style coil packs, I switched to iridium plugs and those worked better.
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