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1.8T Cold weather Start-ups (93 octane)
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Topic: 1.8T Cold weather Start-ups (93 octane) (Read 5927 times)
kenmac
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1.8T Cold weather Start-ups (93 octane)
« on: December 02, 2012, 11:06:16 AM »
As the cold weather sets in, I've noticed poor ignition for about 1-2 seconds while cranking. I noticed if apply some throttle while cranking, this seems to shorten the rough start.
This is a stage 3 tune for a AWP 1.8T. (2003 20th anniversary GTI). 1000cc EV14 injectors. 044 fuel pump in-line. My KRKTE and TVUB values appear to be spot on... 0.00 at idle and -0.1 at run.
I am trying to get a better understanding how the warm-up enrichment maps work. Reading through the FR seemed to help a bit, but then comparing the appropriate tables between the 2.7T and 1.8T platforms really lost me. For example, see the attached image of a FKSTT comparison between the S4 and GTI and TT225. Why are the data points for the 1.8T so non-linear?
I'd like to adjust this map, along with KFWKSTT, but I'm not really sure what direction I should move the factor. Plus I'm really lost as to why OEM would have a factor of +32 at -10degC while at 0degC there's a factor of only 0.045. This makes me nervous to make any changes at all. I'll see if I can somehow log whether or not I'm rich or lean during cranking (I assume too rich?), though the O2 sensor will be cold.
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kenmac
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Re: 1.8T Cold weather Start-ups (93 octane)
« Reply #1 on: December 02, 2012, 11:13:51 AM »
Another attachment comparing the actual maps.
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kenmac
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Re: 1.8T Cold weather Start-ups (93 octane)
« Reply #2 on: December 05, 2012, 01:11:53 PM »
I thought this would generate more interest. The 2.7T FKSTT seems to be predictable and consistent while the 1.8T FKSTT seems to make no sense at all.
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sn00k
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Re: 1.8T Cold weather Start-ups (93 octane)
« Reply #3 on: December 05, 2012, 06:29:28 PM »
try adding +1 to the adress you have for that FKSTT map, i.e if its located on 154CD, then make it 154CE
..and watch the magic..
(ive found 6-7 definitions with this error.. so far..)
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kenmac
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Re: 1.8T Cold weather Start-ups (93 octane)
« Reply #4 on: December 05, 2012, 10:32:27 PM »
Oh man...
Thank you! That did it.
I have 3 different OEM 1.8T files with this error. Glad I didn't try changing any values.
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sn00k
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Re: 1.8T Cold weather Start-ups (93 octane)
« Reply #5 on: December 06, 2012, 03:27:14 AM »
youre welcome!
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