ATAP Reults before using LS1 Edit
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Teching In
Joined: Dec 2001
Posts: 33
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From: MA
ATAP Reults before using LS1 Edit I'm getting ready to reprogram ala LS1 Edit. So I've been doing some test runs before I change anything to establish a base line.
Here are my ATAP results.
Do you think I should adjust my LTFT to around -5 or just leave it alone.
<img src="http://home.attbi.com/~cocalis/C5/Autotap/020417-LTFT.jpg" alt="" />
02's are a little rich @ WOT
<img src="http://home.attbi.com/~cocalis/C5/Autotap/020417-WOT.jpg" alt="" />
Here are my ATAP results.
Do you think I should adjust my LTFT to around -5 or just leave it alone.
<img src="http://home.attbi.com/~cocalis/C5/Autotap/020417-LTFT.jpg" alt="" />
02's are a little rich @ WOT
<img src="http://home.attbi.com/~cocalis/C5/Autotap/020417-WOT.jpg" alt="" />
Re: ATAP Reults before using LS1 Edit I would say that your Lfuel trims are PERFECT!
You are maybe a little rich @ WOT and the timing @ WOT is really good with no KR.
There will be very little gain in HP from where you are now on your tuning. You might try to lean out the PE RPM table a little bit and see if you can get the O2s down to 880mV at WOT with no KR.
Anyway, just my 2 cents worth.
Doc
You are maybe a little rich @ WOT and the timing @ WOT is really good with no KR.
There will be very little gain in HP from where you are now on your tuning. You might try to lean out the PE RPM table a little bit and see if you can get the O2s down to 880mV at WOT with no KR.
Anyway, just my 2 cents worth.
Doc
TECH Apprentice
Joined: Jan 2002
Posts: 384
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From: Murphy, TX
Re: ATAP Reults before using LS1 Edit Kosta, I have collected data for all cells except 16-19. Some cells are definitely harder to capture than others. I think the meaning of some of the higher index cells has changed among model years. I've never seen anyone report values for 16 and 17. Speculating, it looks like maybe '99+ use 18 and 19 for idle... All I have ever seen used for idle in my '98 is 20.
In pricipal, it would be ideal to weight cells immediately preceeding transition to 22 more heavily in your average. My hypothesis was that this would be the boundary cells (those representing high MAP or high RPM) but as it turns out most of mine seem to be either decel or idle. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> This makes sense in retrospect given that I'm working w/ an A4 and am often decelerating prior to WOT bursts.
In practice, I'm not sure the performance return on investment is worth the time spent doing a careful analysis of the trims. (Although I get a kick out of it since I'm a geek. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ) I think you can do just as well by ensuring that all of your trims are negative enough that you can all but guarantee a negative LTFT cell before a transition to cell 22. You really want to look at the range of values in each cell and standard deviations in addition to averages values.
<small>[ April 23, 2002, 10:41 AM: Message edited by: ToplessTexan ]</small>
In pricipal, it would be ideal to weight cells immediately preceeding transition to 22 more heavily in your average. My hypothesis was that this would be the boundary cells (those representing high MAP or high RPM) but as it turns out most of mine seem to be either decel or idle. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> This makes sense in retrospect given that I'm working w/ an A4 and am often decelerating prior to WOT bursts.
In practice, I'm not sure the performance return on investment is worth the time spent doing a careful analysis of the trims. (Although I get a kick out of it since I'm a geek. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> ) I think you can do just as well by ensuring that all of your trims are negative enough that you can all but guarantee a negative LTFT cell before a transition to cell 22. You really want to look at the range of values in each cell and standard deviations in addition to averages values.
<small>[ April 23, 2002, 10:41 AM: Message edited by: ToplessTexan ]</small>
