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Old 01-02-2008, 11:12 PM   #2
Scooby Specialist
Member#: 115021
Join Date: May 2006
Chapter/Region: MAIC
Location: R.I.P Edwin 1985-2009
335i TurboXs~juiced


Originally Posted by williaty View Post
OK, so we got hit by a cold snap today, about 20F colder than I've ever logged the car. I actually recorded an IAT of 5F as I started up the car! For some reason, the car was knocking LIKE MAD today. Very, very frequent knock and HUGE corrections (like 5-7 degrees FLKC+FBKC). Once the car got hot enough than the under-hood temps pushed the IATs up into the 60s (about 30 minutes of driving), the knock dropped back down to about what I've been seeing lately.

What gives?

At first I thought maybe the colder air was dense enough to raise my load (increased load->increased knock), but once I looked at the data again, it's was having a fit even at part-throttle where the loads were no higher than I had been seeing (~0.6-0.8g/rev). What the heck was going on while it was so cold?

What kind of oil do you use?, & And when have you changed it? It is common for a slight knock in the Bloody cold, Thats why its good to use 0w30 or 0w40 In the Cold...
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