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Old 03-11-2012, 04:16 PM   #1
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Default AFR's changing, no changes to fuel map

I've been fighting this for a long time and never got to a solution so I think its time to make a thread about it.

My target AFRs in boost were set to 11.5ish, and after some tuning I would see 11.2-11.4. Not bad. However, these values have moved all on their own.

In boost sometimes I will see 11.2, sometimes 10.9, and sometimes 10.4, which is way richer than I want to be. It doesn't really seem dependent on weather conditions, I have no leads as to why this is happening. This is all without ever even plugging my laptop into the MS. I have not changed anything. I'm going to retune tonight and see what happens over the next couple of days. I would say this is not an LC1 problem, I've gone through new sensors, rewiring, complete removal and reinstallation over the past 3 years and my AFR's never stayed stable for more than a couple weeks.

My question is: Has this happened to anyone else, if so, what did you do to fix this?
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Old 03-11-2012, 04:25 PM   #2
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Sounds like you have some compensation messing with it (air temp, coolant, MAP, etc) or your fuel pressure is changing (but it would have to change a lot to do that). Take some logs and compare.
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Old 03-11-2012, 04:41 PM   #3
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Quote:
Originally Posted by cardriverx View Post
Sounds like you have some compensation messing with it (air temp, coolant, MAP, etc) or your fuel pressure is changing (but it would have to change a lot to do that). Take some logs and compare.
I still have not figured out how IAT and CLT compensation works. What would I be changing to make this problem go away?

Here are my settings.
How many people here are running the clt advance? I thought mine was on but I guess not.
I guess I'm gonna run some logs later, and then run VEAL after that.
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AFR's changing, no changes to fuel map-ms1.jpg   AFR's changing, no changes to fuel map-cltadvance.jpg  
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Old 03-11-2012, 10:13 PM   #4
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Wow. Well I never remember my logs looking this bad.

Observe/opinions?? Ignore the beginning I guess, I was stuck in an awkward traffic situation.
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File Type: msl 2012-03-11_17.28.52.msl (337.9 KB, 49 views)
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Old 03-13-2012, 02:44 PM   #5
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Anyone? I've spent 3 hours searching and fiddling with stuff and have gotten nowhere.
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Old 03-14-2012, 11:12 PM   #6
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I can't make sense of the log, there is no TPS, lambda, and whats up with the sudden drop in boost during the accel event at 3111 sec?
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Old 03-15-2012, 03:48 AM   #7
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That may have been me letting off, either that or overboost protection. I'm not really sure...

Yea, no vTPS. I was looking at AFR, not lambda.
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