MAxed out LTrims how to correct?
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TECH Junkie
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From: Glen Burnie, Md
MAxed out LTrims how to correct? Shoudl i use the MAF tables or the injector flow rate table. If its 25% positive shoudl i just tell it it has a bigger injector, then redo WOT? using PE forWOT enrichment its at 1.54 to maintain around 12.5-13.0 which seem like a huge adjustment from stock.
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Re: MAxed out LTrims how to correct?
Shoudl i use the MAF tables or the injector flow rate table. If its 25% positive shoudl i just tell it it has a bigger injector, then redo WOT? using PE forWOT enrichment its at 1.54 to maintain around 12.5-13.0 which seem like a huge adjustment from stock.
Need to increase fuel flow so multiply by percentage less than 100% and this will increase fueling (decrease and PCM increases flow as it thinks injectors are smaller). If you tell it you have BIGGER injectors (multiply by a percent greater than 100%) you will REDUCE fueling further- this is NOT the direction you want to go.
Changing the IFR will change your PE values- you'll need to reduce PE values from 1.54. At 1.54 and + 25 LTFTs you're too lean and PCM is adding fuel ( +25 LTFTs)
Multiply your IFR by 90% and give it some time to adjust/learn. Then see what additional adjustments you need for LTFTs i.e. to get to 0-> -7%. At Zero to slightly negative LTFTs they will zero out at WOT.
Are you using a wideband O2 for WOT AFR? You need a wideband for the WOT AFR.
Hope this helps some. Good Luck.
joel
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TECH Junkie
iTrader: (10)
Joined: Nov 2001
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From: Glen Burnie, Md
Re: MAxed out LTrims how to correct? If your MAF is stock then rescale the IFR table. If MAF is NOT stock then you should adjust the MAF table OR get a stock MAF.
Need to increase fuel flow so multiply by percentage less than 100% and this will increase fueling (decrease and PCM increases flow as it thinks injectors are smaller). If you tell it you have BIGGER injectors (multiply by a percent greater than 100%) you will REDUCE fueling further- this is NOT the direction you want to go.
Changing the IFR will change your PE values- you'll need to reduce PE values from 1.54. At 1.54 and + 25 LTFTs you're too lean and PCM is adding fuel ( +25 LTFTs)
Multiply your IFR by 90% and give it some time to adjust/learn. Then see what additional adjustments you need for LTFTs i.e. to get to 0-> -7%. At Zero to slightly negative LTFTs they will zero out at WOT.
Are you using a wideband O2 for WOT AFR? You need a wideband for the WOT AFR.
Hope this helps some. Good Luck.
joel
Joined: Nov 2001
Posts: 34,629
Likes: 2,550
From: Schiller Park, ILL Member: #317
Re: MAxed out LTrims how to correct?
Vacuum leak? i mean it's not normal to be running that lean... do you have a ported maf?
I had just a minor leak and mine were in the low 20s. Fixing the leak brought them back down into the single digits where they used to be, then I brought them even closer to 0 by usings Binks meathod (X .95 for the whole IFR table). I did not mess with my PE table though, I wonder if I should have?
