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my Z is almost finished just a few more parts need to be installed. I am wondering when would be the best time to tune? winter summer? fall?

I know i have a EFI car but even EFI cars have imperfections in certain weather, i was thinking of tuning in winter but im not sure it would run rich in the summer? or maybe do you think im just over worrying about it?

It doesn't matter when you tune your car. You tune it for when you tune it. There's no "best time". It will eventually go out of tune depending on the weather, temperature, how long you drive it, how often you drive it, what the engine and electronics condition are; etc. It's like a musical instrument. When it feels bad, either troubleshoot or tune it again. If you're just trying to tune for all around, just tune in the dry on a day when you can tune at a time for the average yearly temp. The car might still run lean on very cold or rainy days but it will still work.

EDIT: try not to tune your car in temperature extremes unless it's going to be stuck in that type of weather for a while.

This post has been edited by JKaiba on Oct 24 2012, 12:14 PM

Most ecus can easily compensate for changes in weather, barometric pressure and humidity automatically. So tuning it at any particular time shouldn't effect anything unless you have a shitty tuner who fails and doesn't bother mapping out any of the important areas. Since your running something similar to a Nistune it should be able to compensate for changes in weather.

This post has been edited by HorizontalMitsubishi on Oct 24 2012, 02:14 PM

Location: Miami, FL

Cares about winter

this up coming winter is going to be really cold LOL turbo season is here. LOL!

This post has been edited by s12drifter on Oct 24 2012, 02:49 PM

It doesn't really matter on pump gas, as stated.

I'm going to add simply so that the information is in here that on E85 it's most beneficial to tune during the 'Blend 2' transitional period between summer and winter where the fuel is actually E78. This allows for the most minimal change between seasons giving the car the best chance of not having issues with E70 during the winter months or E85 during the summer if otherwise tuned during one or the other. You'll have the same swing in AFRs over the course of the year, but your starting point is neutral, keeping the car within acceptable ranges instead of it going too lean or rich and requiring a retune during the opposing season.

This. We tune cars all year round here at MMP and it doesn't really affect your vehicle what time of the year you tune it. You will notice more of a change when you get at higher/lower altitudes when a tune can affect your car, but if you're staying in the same state or near by states you will be fine.

Might need to drop some cash and get the Z tuned hrm... Does anyone have links to research on weather effecting the tune?

Ask any tuning shop, any proper one, anyway. Their tuner should be able to cover it. Hell, DB Performance has a weather display IN the dyno room, FOR the dyno room, with humidity and everything.

I run a summer tune and a winter tune and switch over for the various seasons.