Checked out my wideband today because it was really cold outside and the car is boosting ALOT harder...i can generate almost 5lbs of boost by revving at idle

anyways at 10.5psi I was tuned for 10.8afr...now the upper rpms on the wideband read

5-5.5k - 11.2-5afr
5.5-6.5k-11-11.2afr
6.5-7.8k-10.8afr

I have a zeitronix...car runs so much faster in this weather...should i add more fuel to bring it back to 10.8 across the board or will the colder air allow it to run leaner w/o blowing

 

Colder air = dense air = More air

Add fuel.

 

yea well our cars can't compensate for the IAC on their own? do most guys here add fuel and retune in the winter

 

They can

Are you using a stock ems + piggyback?

I run a wolf and have an air intake temp sensor, and when setup properly (unlike mine ) it will add or remove fuel correctly depending on intake temps maintaining correct afr's across the board

 

i have stock ecu w/ pfs purple box...i have the fuel pump mod and had to subtract out alot of fuel to get it to run nicely

car just runs soo perfect right now i dont want to touch it but dont want to blow this thing!.....is 11.2 too high for powerband

 

I would think your AFR's would remain the same if your boost level was the same. This is why people blow there motors, just limit the boost pressure to where it was before it got cold.