# 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:** 22
**Author:** ![Mafdark](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mafdark/32/6322_2.png) [@Mafdark](https://forums.speedlife.net/u/Mafdark)\ **Post date:** [December 9, 2009, 9:41am UTC](https://forums.speedlife.net/t/getting-tuned-during-winter-months/248924/22 "2009-12-09T09:41:41Z")
> [@Battle of the Most PMs!!!](https://forums.speedlife.net/t/battle-of-the-most-pms/27034/5): > > Well the first problem is travis posting > > The colder it is outside the more dense the air is and the more fuel its going to use. If the car is tuned in very cold weather its going to use more fuel then if its warm out. This is why i said the car is going to run very rich in the summer once its warm. This also applys to people(including myself) that have gotten their car tuned on a hot summer day, you have to watch the AFRs when beating on the car on late summer nights when the temps are in the 50’s, car could go lean right, which is why all the modifiers on most tuning software are important. everything from AIT’s to volt readings need to be carefully adjusted to maintain the AFR when everything else changes. However i’ve always found that there is no possible way to set every single one of them perfectly especially when it comes to a BIG difference such as a cold wet winter when you were tuned on a dry summer day. Travis seems to make it sound like the ECU will just take care of itself but I find that hard to believe. just my 2 cents, I would really like to hear from the experts on this topic. --- _[View the full topic](https://forums.speedlife.net/t/getting-tuned-during-winter-months/248924)._