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I can't seem to lean her out.

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Old 04-30-2006, 05:56 PM   #1
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Default I can't seem to lean her out.

Ok, I am running the HPT 2Bar SD for the 98's. I have my commanded AFR at 1.13 across the board and am still getting like 11.7 to 12.0:1 AFR's on the wideband. My VE table is at zero at WOT (was positive and kept adding till it zeroed out). Now I have values in the 115 range in 100 Kpa cells over 3K RPM. Any ideas?
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Old 05-01-2006, 07:11 AM   #2
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bump ttt
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Old 05-01-2006, 10:05 AM   #3
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Commanded as in, this is what the scanner echoes back
while running? Or commanded, like what is in some tune
table or other? Because there's a lot of modifiers and
layers that meddle, between the tables and the final fuel
multiplier commanded.
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Old 05-01-2006, 10:39 AM   #4
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I'd like to see the bin file posted so we can look it over.
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Old 05-01-2006, 10:55 AM   #5
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Quote:
Originally Posted by 98Z28CobraKiller
Ok, I am running the HPT 2Bar SD for the 98's. I have my commanded AFR at 1.13 across the board and am still getting like 11.7 to 12.0:1 AFR's on the wideband. My VE table is at zero at WOT (was positive and kept adding till it zeroed out). Now I have values in the 115 range in 100 Kpa cells over 3K RPM. Any ideas?
Using the factory narrow bands to tune your VE?
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Old 05-01-2006, 01:02 PM   #6
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perhaps OLFA table is richer than what you are commanding? (PCM will use OLFA if if it's richer than PE)
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Old 05-01-2006, 04:25 PM   #7
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Quote:
Originally Posted by jimmyblue
Commanded as in, this is what the scanner echoes back
while running? Or commanded, like what is in some tune
table or other? Because there's a lot of modifiers and
layers that meddle, between the tables and the final fuel
multiplier commanded.
Commanded as in the PE table vs Stoich.
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Old 05-01-2006, 04:25 PM   #8
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Quote:
Originally Posted by foff667
I'd like to see the bin file posted so we can look it over.
I'll post it when I get home.
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Old 05-01-2006, 04:26 PM   #9
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Quote:
Originally Posted by white2001s10
Using the factory narrow bands to tune your VE?

I am using a WB02 but for tunning only. It isn't mine and I have to give it back.
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Old 05-01-2006, 04:28 PM   #10
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Quote:
Originally Posted by horist
perhaps OLFA table is richer than what you are commanding? (PCM will use OLFA if if it's richer than PE)
I thought that OLFA was only used in Open Loop. I am using closed loop and am just using the wideband temporarly (until I get it all dialed in).

I am borrowing the wideband and have to give it back soon.
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Old 05-01-2006, 04:38 PM   #11
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oh.. when I saw that you were 11.7-12.0 and wanted to lean out... I assumed you were talkng about open loop


what do the stock O2 sensors show? What are your fuel trims?
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Old 05-01-2006, 05:45 PM   #12
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keep in mind wot is open loop...so it still applies...if that olfa table is richer then the pe it wont lean out. At least thats my understanding.

Last edited by foff667; 05-01-2006 at 06:07 PM..
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Old 05-01-2006, 07:29 PM   #13
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Quote:
Originally Posted by 98Z28CobraKiller
I am just using the wideband temporarly (until I get it all dialed in).
I am borrowing the wideband and have to give it back soon.
So your narrow bands are still hooked up and operating for closed loop?
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Old 05-01-2006, 09:25 PM   #14
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Follow the link to see the tune.

http://www.hptuners.com/forum/showth...8161#post38161
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Old 05-01-2006, 09:26 PM   #15
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Quote:
Originally Posted by white2001s10
So your narrow bands are still hooked up and operating for closed loop?

Yes.......
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Old 05-01-2006, 09:31 PM   #16
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Appears that the OLFA is at 1.13 which should be about 13.0.
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Old 05-01-2006, 09:56 PM   #17
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Quote:
Originally Posted by 98Z28CobraKiller
Appears that the OLFA is at 1.13 which should be about 13.0.
Or more like 12.702:1

When your wideband and narrowbands don't agree then it's time to verify your wideband. If it's okay, then it's time to either fix the problem with the narrow-bands, or simply ignore them.

It sounds like you've just adjusted your high-load VE cells too high based on what your narrow-bands tell you. Personally I don't trust narrow-bands at all.
This is one of the down-sides to using the easy way of VE tuning.
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Old 05-04-2006, 02:34 PM   #18
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http://www.hptuners.com/forum/showth...8488#post38488

Follow the link above to the outcome and to view the final tune and log files.

In a nut shell, lowering my VE (as White stated above) I was able to get control over my PE table and get AFR right.

Thanks guys.
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Old 05-04-2006, 03:23 PM   #19
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That sounds right to me.
If you still find you are getting positive fuel trims in the high-load cells that carry over to WOT, you might consider redefining the boundaries of the high-load cells as was suggested in other threads by Jimmyblue.
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Old 05-04-2006, 03:42 PM   #20
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Quote:
Originally Posted by white2001s10
That sounds right to me.
If you still find you are getting positive fuel trims in the high-load cells that carry over to WOT, you might consider redefining the boundaries of the high-load cells as was suggested in other threads by Jimmyblue.

Please explain or post a link.
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Old 05-04-2006, 03:42 PM
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