LS1 Edit- Adjusting AFR.
Thread Starter
12 Second Truck Club
Joined: Feb 2002
Posts: 5,574
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From: Sacramento, CA
LS1 Edit- Adjusting AFR. WHat charts should I use to adjust the air fuel ratio?
I need to lean my motor out after installing my new cam because it is running so rich but I am not sure which tables to use. Once I find the table could I just use a multiply value say 2% or 4% etc???
I need to lean my motor out after installing my new cam because it is running so rich but I am not sure which tables to use. Once I find the table could I just use a multiply value say 2% or 4% etc???
TECH Addict
Joined: Nov 2001
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From: College Station, Tx
Re: LS1 Edit- Adjusting AFR. Part throttle is controlled by o2's - you have no control over the A/F ratio directly - only the l-trim value (unless you run open loop).
Full throttle is tuned with the PE vs RPM table.
Chris
Full throttle is tuned with the PE vs RPM table.
Chris
Staging Lane
Joined: Nov 2001
Posts: 77
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From: Phoenix Arizona
Re: LS1 Edit- Adjusting AFR. Ok if A/F ratio is controlled by the O2’s then how do I fix a part throttle pinging problem? I was thinking that I need to adjust the MAF tables to richen it up at part throttle. Is this correct?
Re: LS1 Edit- Adjusting AFR. Tim:
If your LTRIMs are consistently high (e.g. +20, +25) you can use the MAF table. Increasing the value across the board by 10% (use the multiply by 110) would be a start.
Just make sure your problem is not due to an air leak letting in unmetered air or bad O2 sensors.
If your LTRIMs are consistently high (e.g. +20, +25) you can use the MAF table. Increasing the value across the board by 10% (use the multiply by 110) would be a start.
Just make sure your problem is not due to an air leak letting in unmetered air or bad O2 sensors.
TECH Addict
Joined: Nov 2001
Posts: 2,207
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From: College Station, Tx
Re: LS1 Edit- Adjusting AFR. If your l-trims are out of whack I would adjust the MAF transfer function to get them around -4 or so.
A pinging problem should be addressed through the timing tables.
Chris
A pinging problem should be addressed through the timing tables.
Chris
Thread Starter
12 Second Truck Club
Joined: Feb 2002
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From: Sacramento, CA
Re: LS1 Edit- Adjusting AFR. Ok got it.
I would like to mention that if you try adding timing INSTEAD of leaning it out hen you are running rich, all it will do is mak eyou more rich as the PCM starts adding more fuel to compensate.
I lowered my timing back to stock which is 28deg on the top end and Iwill lean it out. Then I'll play with timing again.
I would like to mention that if you try adding timing INSTEAD of leaning it out hen you are running rich, all it will do is mak eyou more rich as the PCM starts adding more fuel to compensate.
I lowered my timing back to stock which is 28deg on the top end and Iwill lean it out. Then I'll play with timing again.
