Editing Forums/Z31P/z31-performance-upgrade-forums engine-mechanical-aa/Who's running 17+psi

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|op_user=NuCOTech
|op_date=2014-05-02 19:19:52
|post_count=9
|archive_url=/Z31performance_archive/forum/z31-performance-upgrade-forums/engine-mechanical-aa/23711-who-s-running-17-psi.html
}}

'''NuCOTech:''' <small>(2014-05-02 19:19:52)</small>

I'm looking to run somewhere in the 17-25psi range. Are the 6E's plugs going to be fine or will I need to step up to 7's.

Also, anyone running 550cc injectors with nistune? Curious as to what K factor is working for you.

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'''Butter:''' <small>(2014-05-02 19:45:51)</small>

You need 7's after 15psi IMO.

Make sure if you have a gutted plenum, that the top is welded good with nice thick metal. I thought it only happened on Fast and the Furious, but I blew the welds on my intake at 21psi.

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'''matt85turbo:''' <small>(2014-05-02 19:46:24)</small>

NGK 1095'S are one stage colder. I would recommend those as well as lowering the plug gap to around .030 or so. I run mine at .027 and do not have issues with blow out.

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'''300zxturboftw:''' <small>(2014-05-02 19:50:14)</small>

7's at .03-.033 gap. Don't kill your gas millage unless you are having issues with blow out.

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'''NuCOTech:''' <small>(2014-05-02 20:35:00)</small>

Excellent. Guess I'll order me a set of 7s. Thanks guys!

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'''Big Slappy Z:''' <small>(2014-05-08 03:01:38)</small>

{{Quote|user=Butter|You need 7's after 15psi IMO.

Make sure if you have a gutted plenum, that the top is welded good with nice thick metal. I thought it only happened on Fast and the Furious, but I blew the welds on my intake at 21psi.}}

I just lol'd really hard

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'''707Redz31:''' <small>(2014-05-08 14:46:58)</small>

{{Quote|user=NuCOTech|I'm looking to run somewhere in the 17-25psi range. Are the 6E's plugs going to be fine or will I need to step up to 7's.

Also, anyone running 550cc injectors with nistune? Curious as to what K factor is working for you.}}

I have 550s. 553cc to be exact high impedance but I have a mustang gt airflow sensor (the "other" ford maf curve in nistune good for 500whp) So that needed k adjustments back up. With both my k is 200.

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'''NuCOTech:''' <small>(2014-05-20 20:01:17)</small>

{{Quote|user=707Redz31|I have 550s. 553cc to be exact high impedance but I have a mustang gt airflow sensor (the "other" ford maf curve in nistune good for 500whp) So that needed k adjustments back up. With both my k is 200.}}

Great, thanks for that info. I will use 200 for a starting point and I should be able to go from there.

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'''harwood909:''' <small>(2014-06-03 00:06:45)</small>

There is a tick box you can check when adjusting injector size that will recalculate K-value on it's own. I would go by that as injectors swing the K-value one way and the MAF has the opposite affect on it. I don't remember which one is which. It is in one of the Nistune Manuals.