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closed loop-runs poor

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Old Oct 8, 2008 | 12:09 PM
  #11  
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Running in closed loop speed density allows the fuel trims to compensate for temp changes. This set-up works best with the long term trims disabled. No need to check your maf tables, if the fail is set at 0, or it is off the truck completely the engine will not use the tables.
I agree with the 02 placment issue....
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Old Oct 8, 2008 | 12:18 PM
  #12  
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Originally Posted by 7845
the placement of your 02s sounds like the issues. my 2 02s are .....one is in the crossover like in the stock driverside location the other is in the Log manifold on the passengerside. teh WO2 is only one in downpipe.
Agree. You want at least one bank to be able to fuel independently.


Originally Posted by t_thall
i can't remember, i'll check.

Will open loop still adjust for temperature and stuff? Is it possible to just run off the wideband?
In EFILive there is an IAT VE modifier table that you can use to adjust for temps. Not sure about HPT.

Originally Posted by 7845
my truck runs souly off the wideband. its to the point the tune is good enough to not need the laptop in truck anymore. to answer your question no, the truck in OLSD will not adjust for temps
Running in OLSD the PCM runs in open loop, with no fueling correction at all. Just wanted to clarify - it sounded a little misleading when you said your truck runs off the wideband, like it's using the wideband to make fueling corrections. Also, check to see if there is an IAT correction table in HPT. It usually has the same features as EFILive, and EFILive does have the IAT correction table.

Originally Posted by nonnieselman
Why would you want to go back to CLSD if you don't have a MAF?
I'm just running OLSD with no MAF and have no issues.
Once I get my VE tables dialed in I plan to go to CLSD so I don't have to retune for altitude, pressure, or temperature changes.
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Old Oct 8, 2008 | 12:20 PM
  #13  
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It only needs to correct for temp changes...
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Old Oct 8, 2008 | 12:22 PM
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Originally Posted by Wilde Racing
It only needs to correct for temp changes...
In theory, yes, but if I run from Phoenix to Flagstaff (1400 ft to about 7000 ft elevation) my tune is way off.
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Old Oct 8, 2008 | 12:25 PM
  #15  
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Originally Posted by thunder550
Agree. You want at least one bank to be able to fuel independently.




In EFILive there is an IAT VE modifier table that you can use to adjust for temps. Not sure about HPT.



Running in OLSD the PCM runs in open loop, with no fueling correction at all. Just wanted to clarify - it sounded a little misleading when you said your truck runs off the wideband, like it's using the wideband to make fueling corrections. Also, check to see if there is an IAT correction table in HPT. It usually has the same features as EFILive, and EFILive does have the IAT correction table.



Once I get my VE tables dialed in I plan to go to CLSD so I don't have to retune for altitude, pressure, or temperature changes.
thanks chris. sometimes my words that come out arent as clear as they need to be. good explantion to the OP
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Old Oct 8, 2008 | 02:51 PM
  #16  
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Originally Posted by thunder550
Once I get my VE tables dialed in I plan to go to CLSD so I don't have to retune for altitude, pressure, or temperature changes.

AHHH... cool stuff! learned something new today..
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Old Oct 8, 2008 | 03:32 PM
  #17  
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ive been running OLSD for 6 months now. I plan on going clsd here someday. I think me Ve is finally done.

With the values i picked up of the efilive forum, my truck has been lean her recently. Ve was lined up with the approp temp and what not as well. I need some other ones to put in A0014. Got any thunder?


0.864990
0.883301
0.899902
0.916748
0.933350
0.949951
0.966553
0.983398
1.000000 at 104* which was my average during autove.
1.016601
1.033447
1.050049
1.066650
1.083252
1.100098
1.116699
1.133301
1.149902
1.149902
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Old Oct 8, 2008 | 04:19 PM
  #18  
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There is definatly no way to use my wideband instead of my reg 02's that anyone knows of? Just thought it might respond a little better.
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Old Oct 8, 2008 | 04:23 PM
  #19  
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not that I know of
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Old Oct 8, 2008 | 04:23 PM
  #20  
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Nope, not unless you go to a standalone aftermarket ECU setup.
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