Why does my 1.8t feel very slow in the cold weather,, its about 35 degrees
01-07-2003, 01:21 PM
#6
normally in hot weather the ECU doesn't increase boost to maintain o2 levels, it just reduces fuel.
basically in hot weather the car doesn't run at it's maximum capability under the stock programming. In cold weather, the ecu will possibly lower boost pressure to compensate for denser air, but you will at least be at max performance for the programming. So yes it will be stronger.
01-07-2003, 01:41 PM
#7
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Check out my post about Boost Controllers
<ul><li><a href="https://forums.audiworld.com/performance/msgs/48505.phtml">https://forums.audiworld.com/performance/msgs/48505.phtml</a</li></ul>
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01-07-2003, 02:13 PM
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It is not the ecu that is lowering the boost level in cold weather
has more to do with how colder intake charge temps will always have a lower PSI level. That and the fact that lower temps will have a higher barometric pressure causing the motor to actually make more vacume.
01-07-2003, 04:23 PM
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Here's your answer!!! READ!
Hopefully this will help you as I'm glad to share it. I just got my 99.5 1.8TQTip a couple months ago and noticed the same thing. I'd start her up cold and she felt like she was running on 3 cylinders. I agree with Manuel, once the car is warmed up she runs like a champ.
The fix however (at least for me) was to change over to Mobil 1 5W-40 synthetic. I live in Utah. The oil isn't as heavy when cold and so far I'm VERY happy with my $30 oil change. I can honestly say that I noticed a difference in cold performance the second I drove it after the oil change. Get the filter from audi, and the oil from autozone/pepboys/etc. Ran me $7something for the filter, $26.00 for the case of 6 quarts at autozone.
The fix however (at least for me) was to change over to Mobil 1 5W-40 synthetic. I live in Utah. The oil isn't as heavy when cold and so far I'm VERY happy with my $30 oil change. I can honestly say that I noticed a difference in cold performance the second I drove it after the oil change. Get the filter from audi, and the oil from autozone/pepboys/etc. Ran me $7something for the filter, $26.00 for the case of 6 quarts at autozone.