Changes in weather effect tune?
Thread Starter
On The Tree
Joined: Jul 2010
Posts: 196
Likes: 1
From: Pensacola, Fl
Changes in weather effect tune? If I were to get a street tune on a hot summer day when the temp is 96+ would this cause my tune to be way off when the winter rolls around and the temp is down in the 30's. or will the computer compensate for the change in weather to keep the tune spot on?
If you're tuned to run in closed loop, it will pull fuel at cruise when winter rolls around. However, it's likely that WOT will be rich. The only way around that is to tune the car so that you have some positive fuel trims (i.e. ~+5%).
The tune swings around a bunch anyways - different gears, different loads, sensor deviation, engine temp, etc....
The small drift due to weather is just noise. As long as your IAT is plugged in and not simulated then you should be fine.
The small drift due to weather is just noise. As long as your IAT is plugged in and not simulated then you should be fine.
I agree with above. A MAF based tune should tolerate the temp swings better, but CLSD still isn't bad. From hot to cold I richen up about .3-.4 points AFR at WOT, but all closed loop cells stay trimmed to stoich. If you run LTFTs (I don't) it would probably be a touch better. I like the response of SD tuning, so I just load a cold, mid, or hot weather tune based on the time of year. One tune will do the job as long as it's not tuned right on the ragged edge, though.
