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View Full Version : SR20det does not rev past 4k


JohnnyDrfiter22
08-08-2019, 10:57 AM
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

blksylv
08-08-2019, 11:14 AM
Just curious as to if the 2 step was set up incorrectly?

ultimateirving
08-09-2019, 05:28 PM
Have you checked the coil packs ? Boost leak test ? What about your plug gap and heat range ?

JohnnyDrfiter22
08-10-2019, 12:34 PM
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.

ultimateirving
08-11-2019, 09:17 PM
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

JohnnyDrfiter22
08-13-2019, 03:14 PM
That makes sense. I have a few spares. I'll throw them in and see what happens.

JohnnyDrfiter22
08-16-2019, 06:24 PM
I changed out the coil packs and no changes. I'm stumped!!

Jfornachon
08-16-2019, 09:53 PM
Have you checked your tune? No mention of that reply.
Are you map or mf?

Have a great day,
jared

inopsey
08-16-2019, 11:18 PM
what does your wideband read when this happens??

ultimateirving
08-20-2019, 01:38 PM
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.