That's weird because that's the opposite of what usually happens. Usually the cold air makes you run leaner.

 

LOL, that's exactly what I thought it SHOULD do since there is more oxygen per given quantity. That's prolly wrong, but I like my personal philospohy. Please correct me since I'm prolly wrong. Hahahahaha

 

What you thought and what dsm1995gst said is correct...colder air should make you run leaner. The reason being colder air is more dense with more oxygen per part (as you stated).

It's weird that your AF gauge shows you running richer...maybe the ECU is somehow trying to overcompensate for the extra air it measures. I guess it depends on your mods.

Jon

 

You are correct. The colder air is denser resulting in a leaner mixture.

 

Gotta be the ecu adding more fuel for the lower temps...

Do you have a logger and a s-afc?

If so, you could check your logs at higher temps against a current log at the colder temps and see what your IPW was then and is now at a given rpm and boost psi at WOT.

Let's say you were tuned for .90v at wot at 75F. Your setting for 5000rpm was +5%. Now at the colder temps, the s-afc still adds +5%, to a higher number from the MAS. Depending on your mods and what not, it's possible that +5% is now too much. It is just putting you into a different fuel curve, within the ecu's maps and you might be getting more fuel now simply because of this. I'm pretty sure IPW would/could verify this.

I know you have a 1g stryker, do you have a 2g mas installed? (I can't remember.) I've found that they can be temp. sensitive, so I try to tune during an "average" daily temp.

 

First, thanks for the replies everybody.

- Van, I do not have an afc yet, and I should have a pocketlogger within 2 weeks or so. As for the MAS, I still have the 1g stock one. Also, what does IPW stand for? Haha, I feel like such a newbie.

 

Injector Pulse Width, if I'm not mistaken.

 

Alright, well it sounds like I'll just have to wait until I get my pocketlogger to really see what's going on inside then. Thanks for all the input though.

 

My car does the same thing when it's cold. It runs rich as hell around .97 or so. Normally I run -25 from 5 to 7krpm. And when it's 40s out I run -30 to keep it down to .92v. If I keep the car for warmer weather settings it runs dog slow in the cold.