# How to read plugs

**URL:** <https://forums.speedlife.net/t/how-to-read-plugs/204143>\
**Category:** PittSpeed Automotive\
**Created:** [November 10, 2009, 9:01am UTC](https://forums.speedlife.net/t/how-to-read-plugs/204143 "2009-11-10T09:01:42Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Quik](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/quik/32/5979_2.png) [@Quik](https://forums.speedlife.net/u/Quik)\
**Post date:** [November 10, 2009, 9:01am UTC](https://forums.speedlife.net/t/how-to-read-plugs/204143/1 "2009-11-10T09:01:42Z")

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[http://www.dragstuff.com/techarticles/how-to-read-plugs.html](http://www.dragstuff.com/techarticles/how-to-read-plugs.html)

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**Author:** ![VictorSmalls](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/victorsmalls/32/5944_2.png) [@VictorSmalls](https://forums.speedlife.net/u/VictorSmalls)\
**Post date:** [November 10, 2009, 9:05am UTC](https://forums.speedlife.net/t/how-to-read-plugs/204143/2 "2009-11-10T09:05:43Z")

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Good read. I didn’t know about the heat range readings. I run a 103 in mine and that was a guess.

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**Author:** ![stinkbox](https://avatars.discourse-cdn.com/v4/letter/s/9f8e36/32.png) [@stinkbox](https://forums.speedlife.net/u/stinkbox)\
**Post date:** [November 11, 2009, 9:51am UTC](https://forums.speedlife.net/t/how-to-read-plugs/204143/3 "2009-11-11T09:51:09Z")

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Def good info.

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**Author:** ![Jeff95TA](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jeff95ta/32/5935_2.png) [@Jeff95TA](https://forums.speedlife.net/u/Jeff95TA)\
**Post date:** [November 11, 2009, 9:59am UTC](https://forums.speedlife.net/t/how-to-read-plugs/204143/4 "2009-11-11T09:59:56Z")

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Make sure you note the statements at the beginning of the article:

This is only valid if you shut-off the engine after the finish line then tow the car back to the pits where you remove the plugs for reading !!  
Or if you are on the dyno  
VALID ONLY for full load acceleration or steady state dyno tests