EGT placement and cylinder fuel trim balancing
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Honda-Tech Member
Joined: Sep 2002
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From: Twin Falls, ID, USA
EGT placement and cylinder fuel trim balancing
I have a D16z6 turbo that I'm having issues with uneven fueling. I'm 99% sure it's due to intake manifold providing an uneven amount of air to each cylinder. I would like to install EGT probes on each exhaust port. They will be open element type. How close to the head is ideal?
Is the goal in EGT tuning to get each one reading equal temperature?
I have a wideband down stream of the turbo so I'm not expecting to use them to tune AFRs unless there is a good way to. How does AFR effect the temperature and how does ignition timing effect it? If I understand correctly, temps peak at stoichiometric mixtures and get cooler lean of peak and rich of peak. They get hotter if the ignition is retarded which would indicate too much ignition retard? Anyways, I'm more focused on balancing the fueling across a wide load range. I have already tested and replaced my fuel injectors just to cover my bases. I have already read the plugs which is why I'm doing this.
Is the goal in EGT tuning to get each one reading equal temperature?
I have a wideband down stream of the turbo so I'm not expecting to use them to tune AFRs unless there is a good way to. How does AFR effect the temperature and how does ignition timing effect it? If I understand correctly, temps peak at stoichiometric mixtures and get cooler lean of peak and rich of peak. They get hotter if the ignition is retarded which would indicate too much ignition retard? Anyways, I'm more focused on balancing the fueling across a wide load range. I have already tested and replaced my fuel injectors just to cover my bases. I have already read the plugs which is why I'm doing this.
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From: The South - Roll Tide !!!
Re: EGT placement and cylinder fuel trim balancing
I have a D16z6 turbo that I'm having issues with uneven fueling. I'm 99% sure it's due to intake manifold providing an uneven amount of air to each cylinder. I would like to install EGT probes on each exhaust port. They will be open element type. How close to the head is ideal? Within a few inches of the exhaust port. Make sure that the probes are equally distanced on each exhaust tube and not in a turn... straight pipe only.
Is the goal in EGT tuning to get each one reading equal temperature? Yes.
I have a wideband down stream of the turbo so I'm not expecting to use them to tune AFRs unless there is a good way to. How does AFR effect the temperature and how does ignition timing effect it? If I understand correctly, temps peak at stoichiometric mixtures and get cooler lean of peak and rich of peak. They get hotter if the ignition is retarded which would indicate too much ignition retard? Anyways, I'm more focused on balancing the fueling across a wide load range. I have already tested and replaced my fuel injectors just to cover my bases. I have already read the plugs which is why I'm doing this. "Too rich" can falsely increase the EGT's in a cylinder because some fuel is actually burned in the exhaust port/runner.
Is the goal in EGT tuning to get each one reading equal temperature? Yes.
I have a wideband down stream of the turbo so I'm not expecting to use them to tune AFRs unless there is a good way to. How does AFR effect the temperature and how does ignition timing effect it? If I understand correctly, temps peak at stoichiometric mixtures and get cooler lean of peak and rich of peak. They get hotter if the ignition is retarded which would indicate too much ignition retard? Anyways, I'm more focused on balancing the fueling across a wide load range. I have already tested and replaced my fuel injectors just to cover my bases. I have already read the plugs which is why I'm doing this. "Too rich" can falsely increase the EGT's in a cylinder because some fuel is actually burned in the exhaust port/runner.