# Getting Tuned During Winter Months **URL:** \ **Category:** Shift518 Automotive\ **Created:** [December 8, 2009, 8:19pm UTC](https://forums.speedlife.net/t/getting-tuned-during-winter-months/248924 "2009-12-08T20:19:29Z")\ **Posts on this page:** 1\ **Showing post:** 41
**Author:** ![Auto0utcast1](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/auto0utcast1/32/6546_2.png) [@Auto0utcast1](https://forums.speedlife.net/u/Auto0utcast1)\ **Post date:** [December 11, 2009, 8:18am UTC](https://forums.speedlife.net/t/getting-tuned-during-winter-months/248924/41 "2009-12-11T08:18:02Z")
> [@Wii Play](https://forums.speedlife.net/t/wii-play/24909/38): > > air is totally different during the winter than in the summer. I dont know the answer but i know simple air density, and air is more dense in cold than it is in warmer climate. Since air/fuel is important i would think that it would have a lasting effect on your tune. no. ive said this multiple times. there are 3-4 different realtime maps for the ecu to pull from at any given time. it takes the info from the IAT and MAF sensors and choses the right realtime map to run. you dont run injectors past 85% duty cycle and you tune the basemap properly and you only need one tune. anyone that has to go back for retunes depending on weather isnt getting a good tune to begin with. --- _[View the full topic](https://forums.speedlife.net/t/getting-tuned-during-winter-months/248924)._