WHat AFR should you be seeing on...
WHat AFR should you be seeing on... Sorry if the question sounds redundant or basic, but still new to the tuning scene and would like to know what AFR should I be seeing with my MS4 cammed LS1 in the following conditions:
-IDLE hot/close loop
-Cruising at light throttle
-Cruising moderate throttle
-Cruising WOT
I have an LM-1 wideband and using EFI live. I changed the settings in the LM-1 to the settings suggested by EFI live in Analaog1 and Analog 2 outputs.
TIA
-IDLE hot/close loop
-Cruising at light throttle
-Cruising moderate throttle
-Cruising WOT
I have an LM-1 wideband and using EFI live. I changed the settings in the LM-1 to the settings suggested by EFI live in Analaog1 and Analog 2 outputs.
TIA
Originally Posted by 808ws6
Sorry if the question sounds redundant or basic, but still new to the tuning scene and would like to know what AFR should I be seeing with my MS4 cammed LS1 in the following conditions:
-IDLE hot/close loop
-Cruising at light throttle
-Cruising moderate throttle
-Cruising WOT
I have an LM-1 wideband and using EFI live. I changed the settings in the LM-1 to the settings suggested by EFI live in Analaog1 and Analog 2 outputs.
TIA
-IDLE hot/close loop
-Cruising at light throttle
-Cruising moderate throttle
-Cruising WOT
I have an LM-1 wideband and using EFI live. I changed the settings in the LM-1 to the settings suggested by EFI live in Analaog1 and Analog 2 outputs.
TIA
-14.7
-12.2-14.7
-12.2-13.2
Originally Posted by 808ws6
Sorry if the question sounds redundant or basic, but still new to the tuning scene and would like to know what AFR should I be seeing with my MS4 cammed LS1 in the following conditions:
-IDLE hot/close loop (14.63:1)
-Cruising at light throttle (14.63:1)
-Cruising moderate throttle (14.63:1 or 12.5:1~12.8:1 if PE kicks in)
-WOT (12.5:1~12.8:1)
I have an LM-1 wideband and using EFI live. I changed the settings in the LM-1 to the settings suggested by EFI live in Analaog1 and Analog 2 outputs.
TIA
-IDLE hot/close loop (14.63:1)
-Cruising at light throttle (14.63:1)
-Cruising moderate throttle (14.63:1 or 12.5:1~12.8:1 if PE kicks in)
-WOT (12.5:1~12.8:1)
I have an LM-1 wideband and using EFI live. I changed the settings in the LM-1 to the settings suggested by EFI live in Analaog1 and Analog 2 outputs.
TIA
Originally Posted by foff667
-could be skewed depending on overlap
-
-
What does PE do and how does it kick in?
Thanks again guys!
Gil
Originally Posted by 808ws6
That is what I was thinking. it has 239 duration 649 lift on intake and 609 242 dur on exh, so I was wondering if I am looking at a skewed AFR of 1.7 at idle?
What does PE do and how does it kick in?
Thanks again guys!
Gil
What does PE do and how does it kick in?
Thanks again guys!
Gil
Thats a good bit of duration. Do you know the LSA? From that you can calculate overlap. THATS the magic number as far as idle tuning.
Also manifold vacuum at idle.
Thanks for the PE explanation, always wondered what that was all about 
I am seeing a range from 15.3 to 16.7 AFR at idle right now.
I tried enrichening the whole MAIN VE table in 5% increments and seems to slightly bring the numbers down and the LTFT (idle and driving) comes down but it smells really really rich. It also seems to be having a harder time starting when I got to about 20% enrichment over stock VE.
If I follow the AUtoVE process, should this be able to help me out with my AFR?
Thanks everybody for trying to help me out!
I am seeing a range from 15.3 to 16.7 AFR at idle right now.
I tried enrichening the whole MAIN VE table in 5% increments and seems to slightly bring the numbers down and the LTFT (idle and driving) comes down but it smells really really rich. It also seems to be having a harder time starting when I got to about 20% enrichment over stock VE.
If I follow the AUtoVE process, should this be able to help me out with my AFR?
Thanks everybody for trying to help me out!
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Well, if you don't want it to smell rich at idle, you'll need to change the closed loop idle settings. Either set up a custom operating system or futz with the PE settings for <1200 RPM's & the TP% PE Enablers so that it idles in open loop. Then, you can lean it out without the fuel trims getting in the way.
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Originally Posted by SSpdDmon
Well, if you don't want it to smell rich at idle, you'll need to change the closed loop idle settings. Either set up a custom operating system or futz with the PE settings for <1200 RPM's & the TP% PE Enablers so that it idles in open loop. Then, you can lean it out without the fuel trims getting in the way.
SSpdDmon,
Thanks for helping me out with this, much appreciated.
So do I change the PE settings in "PE Modifier based on RPM"? If so, what value do I enter in the below 1200 rpm fields?
I've noticed there are no clear cut and dry mininum RPM for closed loop setting I can change.
Once I can get it to stay in open loop at idle, I can change the "Commanded Fuel when in Open Loop" chart to get it to not smell so rich, correct?
Just in case I did not mention it, I am using EFI live.
Many thanks again
Originally Posted by edcmat-l1
Idle A/F will definitely be skewed. Are you seeing 1.7:1, or 17:1?
Thats a good bit of duration. Do you know the LSA? From that you can calculate overlap. THATS the magic number as far as idle tuning.
Also manifold vacuum at idle.
Thats a good bit of duration. Do you know the LSA? From that you can calculate overlap. THATS the magic number as far as idle tuning.
Also manifold vacuum at idle.
The LSA is 111.5 deg
Thanks!
Originally Posted by 808ws6
SSpdDmon,
Thanks for helping me out with this, much appreciated.
So do I change the PE settings in "PE Modifier based on RPM"? If so, what value do I enter in the below 1200 rpm fields?
I've noticed there are no clear cut and dry mininum RPM for closed loop setting I can change.
Once I can get it to stay in open loop at idle, I can change the "Commanded Fuel when in Open Loop" chart to get it to not smell so rich, correct?
Just in case I did not mention it, I am using EFI live.
Many thanks again
Thanks for helping me out with this, much appreciated.
So do I change the PE settings in "PE Modifier based on RPM"? If so, what value do I enter in the below 1200 rpm fields?
I've noticed there are no clear cut and dry mininum RPM for closed loop setting I can change.
Once I can get it to stay in open loop at idle, I can change the "Commanded Fuel when in Open Loop" chart to get it to not smell so rich, correct?
Just in case I did not mention it, I am using EFI live.
Many thanks again
Originally Posted by SSpdDmon
Your best bet is a custom OS. If you decide to try and make it work as I described above, you need to have closed-loop enabled. You set the PE table for your idle regions at the AFR you want for idle (ie: 800=15.8 & 1200=15.0, which would make 900=15.6). You'll have to set the Commanded Fuel in Open Loop (in the idle regions around operating temps and MAP) similarly. Then, change the PE Enable table so that 0% TP% will turn PE (open-loop) on. I'm assuming with that cam you won't be driving it hard at 1200 rpms. This is still somewhat experimental and I've only heard of a couple people doing this. So, there may be some side effects. But, it'd be worth a try.
Hmmm...very interesting. Maybe I'll try this for sh*ts and giggles.
R/
Frat
Teching In
Joined: Apr 2006
Posts: 1
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From: Placentia, CA
Your best bet is a custom OS. If you decide to try and make it work as I described above, you need to have closed-loop enabled. You set the PE table for your idle regions at the AFR you want for idle (ie: 800=15.8 & 1200=15.0, which would make 900=15.6). You'll have to set the Commanded Fuel in Open Loop (in the idle regions around operating temps and MAP) similarly. Then, change the PE Enable table so that 0% TP% will turn PE (open-loop) on. I'm assuming with that cam you won't be driving it hard at 1200 rpms. This is still somewhat experimental and I've only heard of a couple people doing this. So, there may be some side effects. But, it'd be worth a try.
SSpdDmon was right when he suspected there might be side effects. After about 30 seconds it set the DTC P0131 (B1S1 O2 sensor low output) and P0151 (B2S1 O2 sensor low output). After that it goes into OL-Fault and won’t go into CL. I killed the DTC’s (both processing and MIL) it ran about 30 seconds again then set P0137 and P0157. Same codes except for the rear O2’s. Killed those DTC’s (again both processing and MIL).
After all that I have OL below 1200 RPM and it pops right into CL at anything above 1200 RPM until you stand on it hard enough for “real” PE. Because I have not changed any values in any of the PE tables as far as AFR I don’t see any reason that “real” PE should not work as before.
I’m a little surprised I did not see DTC’s for slow response or insufficient activity on the O2 sensors after letting it idle for about 15 min. Maybe the PCM only checks that at speed? I’m hoping that I don’t have to kill anymore O2 DTC’s so if down the road I do have one go bad I’ll get a MIL. I’ll have to drive it some more to see I guess. Drove it about 2 hours today, some freeway some stop and go, and it seemed fine to me. From the drivers seat I can’t feel the transition from OL to CL when I take off from a stop. Time will tell………
Vehicle: 02 C5 Coupe Cam: 224-224 on 114’s OS: 12221588
