Climate changes and SD
11-15-2007, 10:46 PM
#1
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Climate changes and SD So I started tuning my VE tables late summer/ early fall. I still have a little to go but now it has gotten colder. It is in the 40s while when I was tuning the VE tables it was around the 70s. Does the temperature change adversely effect any VE tuning that I did in the hotter weather?
Also unrelated to the temperature when I first turn the car on I'm in open loop SD. The car idles like crap for about two minutes. I have to give it gas to keeps the rpms at 1000 until they level out. if not the car idles way too low like if it was going to shut off and sometimes it does. i have my idle tables set at 900 but the car wont idle at that in open loop SD. any ideas?
Also unrelated to the temperature when I first turn the car on I'm in open loop SD. The car idles like crap for about two minutes. I have to give it gas to keeps the rpms at 1000 until they level out. if not the car idles way too low like if it was going to shut off and sometimes it does. i have my idle tables set at 900 but the car wont idle at that in open loop SD. any ideas?
11-16-2007, 06:36 AM
#2
for the warmup problems, tune RAF.
as for the temp discussions, here's your reading:
http://www.hptuners.com/forum/showthread.php?t=15225
http://www.hptuners.com/forum/showthread.php?t=14486
http://www.hptuners.com/forum/showthread.php?t=6345
https://ls1tech.com/forums/pcm-diagnostics-tuning/309050-iat-relocate-mod.html
and
http://redhardsupra.blogspot.com/200...-modeling.html
these should keep you busy for a while
as for the temp discussions, here's your reading:
http://www.hptuners.com/forum/showthread.php?t=15225
http://www.hptuners.com/forum/showthread.php?t=14486
http://www.hptuners.com/forum/showthread.php?t=6345
https://ls1tech.com/forums/pcm-diagnostics-tuning/309050-iat-relocate-mod.html
and
http://redhardsupra.blogspot.com/200...-modeling.html
these should keep you busy for a while
11-16-2007, 04:38 PM
#6
IAC target RPM vs COOLANT TEMP in P/N
IAC target RPM vs COOLANT TEMP in GEAR
IAC PARK POSITION VS COOLANT TEMP
Those are your idle control tables. If you need to add fuel, as in an open loop lean condition, as in it falls on its face when you try and drive it cold:
OPEN LOOP AFR vs COOLANT vs MAP
Good luck. Hope this helps.
IAC target RPM vs COOLANT TEMP in GEAR
IAC PARK POSITION VS COOLANT TEMP
Those are your idle control tables. If you need to add fuel, as in an open loop lean condition, as in it falls on its face when you try and drive it cold:
OPEN LOOP AFR vs COOLANT vs MAP
Good luck. Hope this helps.
11-16-2007, 04:46 PM
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IAC target RPM vs COOLANT TEMP in P/N
IAC target RPM vs COOLANT TEMP in GEAR
IAC PARK POSITION VS COOLANT TEMP
Those are your idle control tables. If you need to add fuel, as in an open loop lean condition, as in it falls on its face when you try and drive it cold:
OPEN LOOP AFR vs COOLANT vs MAP
Good luck. Hope this helps.
IAC target RPM vs COOLANT TEMP in GEAR
IAC PARK POSITION VS COOLANT TEMP
Those are your idle control tables. If you need to add fuel, as in an open loop lean condition, as in it falls on its face when you try and drive it cold:
OPEN LOOP AFR vs COOLANT vs MAP
Good luck. Hope this helps.
I'll give my open loop afr vs coolant vs map table a look. i can have it fully warmed up and drive it around. turn it off for like two minutes turn it back on and it has that same problem. i'll work on it to see what happens.
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11-16-2007, 05:03 PM
#8
Your idle rpm vs coolant in gear and pn should be higher when its colder, and taper down as the coolant temp increases.
If you have issues on restart after its warm, you amy not be as close as you think on your SD tune. Thats sounds to me like an open loop mixture (A/F) problem, and if its there when its warm, its VE based. Once you have your VE dialed in, it should start up and idle nicely when its warm.
BTW, you can email me your tune and I'll look at it for you if you like.
edcmat-l1@msn.com
If you have issues on restart after its warm, you amy not be as close as you think on your SD tune. Thats sounds to me like an open loop mixture (A/F) problem, and if its there when its warm, its VE based. Once you have your VE dialed in, it should start up and idle nicely when its warm.
BTW, you can email me your tune and I'll look at it for you if you like.
edcmat-l1@msn.com
11-20-2007, 07:59 PM
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Also unrelated to the temperature when I first turn the car on I'm in open loop SD. The car idles like crap for about two minutes. I have to give it gas to keeps the rpms at 1000 until they level out. if not the car idles way too low like if it was going to shut off and sometimes it does. i have my idle tables set at 900 but the car wont idle at that in open loop SD. any ideas?
Glad ya got it worked out. Need anything else you know how to get hold of me.