IFR table
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
I got a quick scan with wideband hooked up and OL commanded (set water temp activation to 240* in table). I didn't know that the AFR error was not set up, so I have ARF readings but not error. In both the histogram and graph, it is showing around 13-1 at idle and when I run it up to around 1800 it goes down to around 11-1 
I have the AFR commanded 14.7 in that range
The VE table is already around 1/2 what other tables are, and it is still pig rich
Any ideas??
I have the AFR commanded 14.7 in that range
The VE table is already around 1/2 what other tables are, and it is still pig rich
Any ideas??
Burning Brakes
Joined: Aug 2010
Posts: 771
Likes: 40
From: killeen TX
I got a quick scan with wideband hooked up and OL commanded (set water temp activation to 240* in table). I didn't know that the AFR error was not set up, so I have ARF readings but not error. In both the histogram and graph, it is showing around 13-1 at idle and when I run it up to around 1800 it goes down to around 11-1
I have the AFR commanded 14.7 in that range
The VE table is already around 1/2 what other tables are, and it is still pig rich
Any ideas??
I have the AFR commanded 14.7 in that range
The VE table is already around 1/2 what other tables are, and it is still pig rich
Any ideas??
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
Attachment 47927919
copy and paste the injector data from this file. This is good data for the 80's pending how your fuel system is setup.
copy and paste the injector data from this file. This is good data for the 80's pending how your fuel system is setup.
Thinks Jimbo
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Drifting
Joined: Nov 2007
Posts: 1,261
Likes: 26
From: Concord NC
I glanced at the scan real quick. You need to add commanded afr to the table in order to log afr error. Seems odd to me that your stft's are 1-2% when idling at rich afr/s (11-12) then when holding rpm at 1500 stft's go up to 10ish% when the afr is actually way closer to what it should be commanding. Is your wideband setup correctly/does the display on WB read same as in the scanner?
Also is that a cold start ? may be good to add engine coolant temperature to primary table as well.
Is this supposed to be a speed density only tune ? (the maf is still enabled if so)
Also is that a cold start ? may be good to add engine coolant temperature to primary table as well.
Is this supposed to be a speed density only tune ? (the maf is still enabled if so)
Last edited by Shoaf85; Nov 11, 2015 at 06:47 PM.
Drifting
Joined: Nov 2007
Posts: 1,261
Likes: 26
From: Concord NC
Going thru the tune a little more in depth shows a few things that need to be changed, fuel transient parameters need to be altered with this size injector as well. A lot of times this will cause a rich condition that wont change regardless of changes made to the tune. Bring it to Concord NC and I will do a street to for ya or dyno tune if you'd like 
Burning Brakes
Joined: Aug 2010
Posts: 771
Likes: 40
From: killeen TX
Haven't had a chance to look at the last two scans. Shoaf may be correct about the transient tables. I still suspect proportional tables are the problem. We need a faster way to communicate. Hit n miss over PM's is gonna take forever.