Well its winter time now and my car seems to be taking an un healthy long time to warm up. My only hypothesis is that since I am running a Si Ecu on the DX motor it is running possibly a little on the rich side. This doesnt seem like the correct answer allthough.

Takes about 20 min at idle in sub freezing temp to reach shy of the midway temp mark.
d15b7 motor with p28 ECU short ram intake 2 1/4" exahust, very soon to be mini me with z6 head
My reasoning to be running the p28 even without the head swap is a richer mixture would suit the free flowing intake and exhaust.

Does anyone have any ideas as to why my car wont warm up?