AFR for max torque vs max hp
04-03-2008, 10:11 PM
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AFR for max torque vs max hp What is the optimal AFR for torque and what is optimal for HP? I have seen this info posted before but I cannot find it. The weather is starting to warm up a bit and I'm about to start working on my tune again. I have driveability decent and want to start working more on WOT.
04-04-2008, 02:57 AM
#2
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Richer for max torque - 12.5 to 12.8, leaner for max hp - 13.1 to 13.4. I saw an excellent chart on this too but I too can't remember where, if I think of it I'll post up.
04-04-2008, 12:35 PM
#4
He's probably referring to setting one AFR at the rpm range of max torque produced on a dyno, and setting a different AFR at the rpm range of max hp.
Some folks like to run richer in the range of peak cylinder pressure to help prevent detonation there. While letting it lean back out as the pressure/torque drops back off when the engine becomes less efficient at the higher rpms, which helps to broaden the torque curve, and extends the HP curve a bit longer.
Can be done with timing, afr, or combination of the two. Hard to pin it down exactly without running on a load controlled dyno though.
04-04-2008, 06:54 PM
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Yes.
He's probably referring to setting one AFR at the rpm range of max torque produced on a dyno, and setting a different AFR at the rpm range of max hp.
Some folks like to run richer in the range of peak cylinder pressure to help prevent detonation there. While letting it lean back out as the pressure/torque drops back off when the engine becomes less efficient at the higher rpms, which helps to broaden the torque curve, and extends the HP curve a bit longer.
Can be done with timing, afr, or combination of the two. Hard to pin it down exactly without running on a load controlled dyno though.
He's probably referring to setting one AFR at the rpm range of max torque produced on a dyno, and setting a different AFR at the rpm range of max hp.
Some folks like to run richer in the range of peak cylinder pressure to help prevent detonation there. While letting it lean back out as the pressure/torque drops back off when the engine becomes less efficient at the higher rpms, which helps to broaden the torque curve, and extends the HP curve a bit longer.
Can be done with timing, afr, or combination of the two. Hard to pin it down exactly without running on a load controlled dyno though.
Thanks for the replies
04-04-2008, 09:16 PM
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Yes.
He's probably referring to setting one AFR at the rpm range of max torque produced on a dyno, and setting a different AFR at the rpm range of max hp.
Some folks like to run richer in the range of peak cylinder pressure to help prevent detonation there. While letting it lean back out as the pressure/torque drops back off when the engine becomes less efficient at the higher rpms, which helps to broaden the torque curve, and extends the HP curve a bit longer.
Can be done with timing, afr, or combination of the two. Hard to pin it down exactly without running on a load controlled dyno though.
He's probably referring to setting one AFR at the rpm range of max torque produced on a dyno, and setting a different AFR at the rpm range of max hp.
Some folks like to run richer in the range of peak cylinder pressure to help prevent detonation there. While letting it lean back out as the pressure/torque drops back off when the engine becomes less efficient at the higher rpms, which helps to broaden the torque curve, and extends the HP curve a bit longer.
Can be done with timing, afr, or combination of the two. Hard to pin it down exactly without running on a load controlled dyno though.
