SR20det does not rev past 4k - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

JohnnyDrfiter22 · 08-08-2019, 09:57 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, 10:14 AM

Just curious as to if the 2 step was set up incorrectly?

ultimateirving · 08-09-2019, 04:28 PM

Have you checked the coil packs ? Boost leak test ? What about your plug gap and heat range ?

JohnnyDrfiter22 · 08-10-2019, 11:34 AM

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, 08:17 PM

Quote:

Originally Posted by JohnnyDrfiter22

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, 02:14 PM

That makes sense. I have a few spares. I'll throw them in and see what happens.

JohnnyDrfiter22 · 08-16-2019, 05:24 PM

I changed out the coil packs and no changes. I'm stumped!!

Jfornachon · 08-16-2019, 08:53 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, 10:18 PM

what does your wideband read when this happens??

ultimateirving · 08-20-2019, 12:38 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.

08-08-2019, 09:57 AM	#1
JohnnyDrfiter22 Zilvia Addict Join Date: Apr 2008 Location: New Jersey Age: 41 Posts: 670 Trader Rating: (0) Feedback Score: 0 reviews	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

08-09-2019, 04:28 PM	#3
ultimateirving Zilvia FREAK! Join Date: Nov 2010 Location: arizona Age: 36 Posts: 1,521 Trader Rating: (1) Feedback Score: 1 reviews	Have you checked the coil packs ? Boost leak test ? What about your plug gap and heat range ? __________________ Z32 with lq4 swap Desert Street Scene \|\| Dssevents.com

08-20-2019, 12:38 PM	#10
ultimateirving Zilvia FREAK! Join Date: Nov 2010 Location: arizona Age: 36 Posts: 1,521 Trader Rating: (1) Feedback Score: 1 reviews	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. __________________ Z32 with lq4 swap Desert Street Scene \|\| Dssevents.com

08-10-2019, 11:34 AM	#4
JohnnyDrfiter22 Zilvia Addict Join Date: Apr 2008 Location: New Jersey Age: 41 Posts: 670 Trader Rating: (0) Feedback Score: 0 reviews	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.

08-13-2019, 02:14 PM	#6
JohnnyDrfiter22 Zilvia Addict Join Date: Apr 2008 Location: New Jersey Age: 41 Posts: 670 Trader Rating: (0) Feedback Score: 0 reviews	That makes sense. I have a few spares. I'll throw them in and see what happens.

08-16-2019, 05:24 PM	#7
JohnnyDrfiter22 Zilvia Addict Join Date: Apr 2008 Location: New Jersey Age: 41 Posts: 670 Trader Rating: (0) Feedback Score: 0 reviews	I changed out the coil packs and no changes. I'm stumped!!

08-16-2019, 08:53 PM	#8
Jfornachon Zilvia Junkie Join Date: Dec 2011 Location: Caldwell Idaho Posts: 300 Trader Rating: (3) Feedback Score: 3 reviews	Have you checked your tune? No mention of that reply. Are you map or mf? Have a great day, jared

08-16-2019, 10:18 PM	#9
inopsey Nissanaholic! Join Date: Jul 2008 Location: canada Posts: 1,701 Trader Rating: (21) Feedback Score: 21 reviews	what does your wideband read when this happens??