# Spark plug heat range

**URL:** <https://forums.speedlife.net/t/spark-plug-heat-range/141812>\
**Category:** Canada Nissan Automotive\
**Created:** [March 13, 2006, 3:37pm UTC](https://forums.speedlife.net/t/spark-plug-heat-range/141812 "2006-03-13T15:37:18Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Dynamo7](https://avatars.discourse-cdn.com/v4/letter/d/5fc32e/32.png) [@Dynamo7](https://forums.speedlife.net/u/Dynamo7)\
**Post date:** [March 13, 2006, 3:37pm UTC](https://forums.speedlife.net/t/spark-plug-heat-range/141812/1 "2006-03-13T15:37:18Z")

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How much will this affect mileage and drivability? Especially on a stock CA18?

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**Author:** ![mikesim](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mikesim/32/5561_2.png) [@mikesim](https://forums.speedlife.net/u/mikesim)\
**Post date:** [March 14, 2006, 11:42am UTC](https://forums.speedlife.net/t/spark-plug-heat-range/141812/2 "2006-03-14T11:42:31Z")

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you might foul them if you don’t need them. for a stock CA18, don’t bother.

for example: if you had turbo back exhaust, T28 and running 14psi, then you might want to go one heat range colder.

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**Author:** ![sr20s13rhd](https://avatars.discourse-cdn.com/v4/letter/s/ad7895/32.png) [@sr20s13rhd](https://forums.speedlife.net/u/sr20s13rhd)\
**Post date:** [March 14, 2006, 11:40pm UTC](https://forums.speedlife.net/t/spark-plug-heat-range/141812/3 "2006-03-14T23:40:51Z")

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what sort of symptoms would call for a colder or warmer plug?

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**Author:** ![Jason\_Lange](https://avatars.discourse-cdn.com/v4/letter/j/65b543/32.png) [@Jason\_Lange](https://forums.speedlife.net/u/Jason_Lange)\
**Post date:** [March 15, 2006, 12:46am UTC](https://forums.speedlife.net/t/spark-plug-heat-range/141812/4 "2006-03-15T00:46:00Z")

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> [@sr20s13rhd](#):
>
> what sort of symptoms would call for a colder or warmer plug?

Usually higher boost or higher compression situations will call for a colder plug.

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**Author:** ![RS13](https://avatars.discourse-cdn.com/v4/letter/r/46a35a/32.png) [@RS13](https://forums.speedlife.net/u/RS13)\
**Post date:** [March 15, 2006, 6:22am UTC](https://forums.speedlife.net/t/spark-plug-heat-range/141812/5 "2006-03-15T06:22:46Z")

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If you are fouling plugs go hotter.  
If you are missing at high rev’s or high boost go colder.

Stock heat range is a 5. Turbo engines is a 6. Most people with upped boost and exhasut run a 7.

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<div class="post-metadata">

**Author:** ![sr20s13rhd](https://avatars.discourse-cdn.com/v4/letter/s/ad7895/32.png) [@sr20s13rhd](https://forums.speedlife.net/u/sr20s13rhd)\
**Post date:** [March 15, 2006, 6:16pm UTC](https://forums.speedlife.net/t/spark-plug-heat-range/141812/6 "2006-03-15T18:16:50Z")

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will an engine act differently if a different plug is needed? What should be looked for?

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**Author:** ![sil\_eightyRPS13](https://avatars.discourse-cdn.com/v4/letter/s/2bfe46/32.png) [@sil\_eightyRPS13](https://forums.speedlife.net/u/sil_eightyRPS13)\
**Post date:** [March 19, 2006, 2:14pm UTC](https://forums.speedlife.net/t/spark-plug-heat-range/141812/7 "2006-03-19T14:14:54Z")

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NGK BCPR6EIX-11 number 6 is the heat range…

[http://www.ngk.com/results\_app.asp?AAIA=1212444](http://www.ngk.com/results_app.asp?AAIA=1212444) u can find these at canadian tire or part source…