My STFT's are near 0 to -2 for whole histo, can someone look at my log?
04-24-2005, 09:06 AM
#1
My STFT's are near 0 to -2 for whole histo, can someone look at my log? After tuning my STFTs in SD i have gotten all my cells to 0 to -2 but when I replay the log and watch the chart display my STFTs are all over the place. Could someone look at my log and tell me they look ok/or I have an exhaust leak?
ASAP would be great. I dont know how to link a file to these pages!
ASAP would be great. I dont know how to link a file to these pages!
04-24-2005, 11:44 PM
#2
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Originally Posted by 99whitews6
After tuning my STFTs in SD i have gotten all my cells to 0 to -2 but when I replay the log and watch the chart display my STFTs are all over the place. Could someone look at my log and tell me they look ok/or I have an exhaust leak?
ASAP would be great. I dont know how to link a file to these pages!
ASAP would be great. I dont know how to link a file to these pages!
04-25-2005, 12:01 AM
#4
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Originally Posted by CAT3
Is there a way to average them that works best, built into HPT or what? Still learning the program so maybe newb "?"
as far as being all over the place... that's what you want... corresponds w/the VE table....
04-25-2005, 12:18 AM
#7
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Originally Posted by CAT3
? Standard dev near zero?
use the average option in the histogram and you'll be fine
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04-25-2005, 12:20 AM
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Cool. Thanks again Mike. I am waiting to get into the SD/VE tuning until I replace my IAC Valve. Its sticking and giving me issues, so figure its best to replace it first, as well just ordered my analog output cable for the LM-1. Soon, very soon.
04-25-2005, 12:22 AM
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Oh, so do the average on the ST's, is there a way to copy it from the log (ctrl+c) to the editor, or do you have to go cell by cell and subtract/add the ST histogram??
04-25-2005, 01:07 AM
#14
Originally Posted by soundengineer
seems to be automatic in HPtuners.... I have never touhed my secondary table..and all the #'s match what I have done to the Primary table
lol..never mind...looked a little closer...found a variance...guess I gotta fix that real quick...
04-25-2005, 01:11 AM
#15
Originally Posted by soundengineer
lol..never mind...looked a little closer...found a variance...guess I gotta fix that real quick...
I dont see any variance betwwen my Primary and secondary tables....
other than secondary does it by 10s and primary does it by 5's on left side of my tables
04-25-2005, 05:17 AM
#17
Originally Posted by Silverhawk_02TA
Yep, the chart will show your STFT's all over the place because they are all over the place. Go to the histogram, and display both the min and max values of your STFT's, and you'll see that they vary wildly. This is because during closed loop the AFR is in a constant rich/lean cycle, with the STFT's compensating accordingly. This is why we use the average STFT value for tuning.
04-25-2005, 06:06 AM
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Originally Posted by 99whitews6
alright, i have been tunign in SD mode for a while now and all my histo values were near zero. I re-enabled LTFT learn and plug the maf back in with the calibrated data. A good section of the histo for LTFT stayed right around 0 to -2 but the rest (40%) were in the negative teens. I set the MAF fail frequency back to zero and disabled LTFT learn again. Now my STFT histo is all over the place and my LTFT histo is pegged from 0 to -2 with no outlying values. Any ideas. I guess I am going to start tuning SD again and try to compile some more MAF calibration data this time.
