# went to the track and got some new times

**URL:** <https://forums.speedlife.net/t/went-to-the-track-and-got-some-new-times/259718>\
**Category:** Shift518 Automotive\
**Created:** [August 1, 2011, 10:05am UTC](https://forums.speedlife.net/t/went-to-the-track-and-got-some-new-times/259718 "2011-08-01T10:05:50Z")\
**Posts on this page:** 1\
**Showing post:** 27

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**Author:** ![jdaniels](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jdaniels/32/6399_2.png) [@jdaniels](https://forums.speedlife.net/u/jdaniels)\
**Post date:** [August 3, 2011, 6:56pm UTC](https://forums.speedlife.net/t/went-to-the-track-and-got-some-new-times/259718/27 "2011-08-03T18:56:44Z")

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> [@MMy New office \> yours](https://forums.speedlife.net/t/mmy-new-office-yours/44164/102):
>
> Why would anyone tune for speed density ? It’s horrible esp if ya have a m.a.f

Speed density is always the way to go with F/I, big cam(s) or when you pass the g/sec limitations of the PCM (pretty easy to do). Mass air flow sensors aren’t as picky about environmental changes, but they can be affected by dirt/dust/grime and become inaccurate over time.

Both are obviously useful in their own sense, in the case of the LS1 PCM it uses both redundantly and I tune both if it’s feasible.

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