LTFT's positive, STFT's negative???
#1
TECH Enthusiast
Thread Starter
iTrader: (26)
Join Date: Mar 2004
Location: Long Island
Posts: 589
Likes: 0
Received 0 Likes
on
0 Posts
LTFT's positive, STFT's negative???
I'm trying to learn tuning with HP Tuners and I've been logging and tweaking a little bit. I began by just logging everything that was going on to get a baseline data log. Next I disconnected and turned off the MAF and logged the STFT's. Logging STFT's and looking at the histogram (set on average) showed negative. I made changes according to this, plugged everything back in, logged again and my LTFT's were worse than when I started.
I noticed that my LTFT's are positive but when I logged STFT's they were negative. Why are these opposite if they're both demonstrating how the computer is compensating for the tune? Shouldn't they both be on the same side of zero?
I noticed that my LTFT's are positive but when I logged STFT's they were negative. Why are these opposite if they're both demonstrating how the computer is compensating for the tune? Shouldn't they both be on the same side of zero?
#2
TECH Enthusiast
Thread Starter
iTrader: (26)
Join Date: Mar 2004
Location: Long Island
Posts: 589
Likes: 0
Received 0 Likes
on
0 Posts
BTW I have both histograms (LTFT and STFT) set to average for the playbacks.
Can someone explain why LTFT's show high positive numbers and STFT's show high negative numbers?
Can someone explain why LTFT's show high positive numbers and STFT's show high negative numbers?
#4
TECH Enthusiast
Thread Starter
iTrader: (26)
Join Date: Mar 2004
Location: Long Island
Posts: 589
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by txhorns281
You LTFTs learn to bring your STFTs to zero. Ideally, we want both of these to be as close to zero as possible. Your MAF is the culprit of your ill effects.
Did I do anything wrong here?
#5
TECH Fanatic
iTrader: (12)
Join Date: Jan 2004
Location: Houston, TX
Posts: 1,869
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by My90Iroc
I made changes after logging the STFT's with the MAF disconnected. The STFT's that I logged were negative and I cut the values in half then added them to my VE table. I then hooked the MAF back up and let the LTFT's relearn themselves to see the effects of my changes. My changes actually moved the LTFT's farther from zero rather than closer, so this is where my confusion lies.
Did I do anything wrong here?
Did I do anything wrong here?
#6
8 Second Club
iTrader: (16)
Originally Posted by txhorns281
You LTFTs learn to bring your STFTs to zero. Ideally, we want both of these to be as close to zero as possible. Your MAF is the culprit of your ill effects.
I thought your STFT's teach your LTFT's to get them closer to zero ???
I tuned with STFT's only...
and my LTFT's are always at 0/-2... my stft's are within 0/-4... all the time!!