How do I lean out part throtle AFR?
03-14-2008, 06:56 AM
#1
How do I lean out part throtle AFR?
I have got my tune set up how I want it on the WOT, but under part throttle acceleration if youre in the throttle at AFR is 11.0-11.5. It all started with the .68 AR exhaughst housing. My milage went from 14 to less than 6MPG
I running a MAFS tune. I have been messing with the VE table and it does nothing. I think it is in the MAFS freq calibration, but I don't know which way to go to adjust it. I just need to be pointed in the right direction.Thanks, J
I running a MAFS tune. I have been messing with the VE table and it does nothing. I think it is in the MAFS freq calibration, but I don't know which way to go to adjust it. I just need to be pointed in the right direction.Thanks, J
Last edited by stock48; 03-14-2008 at 07:05 AM.
03-14-2008, 07:45 AM
#2
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Sounds like you need to log and retune the MAF. Kind of like you do with the VE table only you need to log the correct parameters for the MAF.
AFR error vs. MAF Frequency I believe. Then scale the MAF accordingly.
What tuning software are you using?
Here is a link from the HPT site. Should be good info even if you are using EFI.
http://www.hptuners.com/forum/showthread.php?t=570
AFR error vs. MAF Frequency I believe. Then scale the MAF accordingly.
What tuning software are you using?
Here is a link from the HPT site. Should be good info even if you are using EFI.
http://www.hptuners.com/forum/showthread.php?t=570
Last edited by truckmann; 03-14-2008 at 07:55 AM. Reason: added link
03-14-2008, 08:55 AM
#4
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At which point on the map are you running that rich? you can adjust the p.e fueling and lean it out a bit at lowwer load levels. Are you running maf'ed open loop?
03-14-2008, 04:49 PM
#5
I think it is a closed loop tune but Im not sure. I have been messing with the VE table, but it seems to do nothing. The problem is under moderate load part throttle acceleration. Any time you are over 20%-100% the AFR is 11-11.5:1. I want it 13-13.5AFR up untill about 65%, then go 11.5. This .68AR is allways in boost or 0 vaccume. With the .96AR I didn't have this problem. It was around 13. Which way do you go with the MAF freq to lean out? Thanks, J
03-14-2008, 05:12 PM
#7
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O.K so you disabled the maf?
changing the frequency of the maf while it is disabled will do nothing. Also changing the V.E while the maf is enabled will do nothing (for the most part)
One other question? Are you using 2bar?
Start over, fail the maf, and tune the V.E, then move on to the maf. Take your time, I would also suggest reading the tunning guide on the top of this forum. As far as open loop closed loop, remember this, closed loop equells 14.68 thanks to the 02 sensors corecting the air/fuel.
If all other aspects of the tune are o.k and you are still overlly rich, lean it out with the p.e multiplier table and the p.e enablers......
Posting up a log or two as well as your tune will help us help you!
Good luck
changing the frequency of the maf while it is disabled will do nothing. Also changing the V.E while the maf is enabled will do nothing (for the most part)
One other question? Are you using 2bar?
Start over, fail the maf, and tune the V.E, then move on to the maf. Take your time, I would also suggest reading the tunning guide on the top of this forum. As far as open loop closed loop, remember this, closed loop equells 14.68 thanks to the 02 sensors corecting the air/fuel.
If all other aspects of the tune are o.k and you are still overlly rich, lean it out with the p.e multiplier table and the p.e enablers......
Posting up a log or two as well as your tune will help us help you!
Good luck
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03-14-2008, 06:10 PM
#9
HA! I just disabled the MAF and went foe a drive. It idled wierd for a few seconds and smoothed out. Truck runs perfict.
I wish I had read your recient post. I went 3/4 throttle a few times under boost while watching the AFR. I guess I got lucky, because AFR went to about 12.2-12.5. Driving under cruise conditions AFR is about 14.5-14.9, and under moderate accelleration AFR is 13.2-13.7. Light Acceleration AFR is 14.2 or so. Im happy with that. Now how do I get it to run that way with the MAF hooked up? After seeing how well it drives without it, I can see it needs to be gotten rid of.
Thanks, J
I wish I had read your recient post. I went 3/4 throttle a few times under boost while watching the AFR. I guess I got lucky, because AFR went to about 12.2-12.5. Driving under cruise conditions AFR is about 14.5-14.9, and under moderate accelleration AFR is 13.2-13.7. Light Acceleration AFR is 14.2 or so. Im happy with that. Now how do I get it to run that way with the MAF hooked up? After seeing how well it drives without it, I can see it needs to be gotten rid of. Thanks, J