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Target AFRs: 91, 95, 100 octane?

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Old Aug 23, 2005, 09:31 AM
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Target AFRs: 91, 95, 100 octane?
What are good target AFRs for 91-104 octane between 5500-7500 RPMs, 22 psi, on a car with UTEC, Tuner, TBE, 272s, MBC, Walbro, ARP HS, Injen Intake/UICP:

91?
95?
104?

Looking at my first UTEC log on 104 octane I'm seeing ~10.5 AFR between 5500-7500. Seems rich for 100+ octane.

TIA
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Old Aug 23, 2005, 10:11 AM
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I don't know much about the evo's but when I tune my civic I always keep af at 12.0 or a little under while in boost and 14.7-15.4 in vac.
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Old Aug 23, 2005, 10:16 AM
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91-11.1

95-11.3

100-11.5
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Old Aug 23, 2005, 11:11 AM
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Thanks for the feedback... looks like I'm pretty rich.
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Old Aug 23, 2005, 11:18 AM
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Originally Posted by lbcevo
What are good target AFRs for 91-104 octane between 5500-7500 RPMs, 22 psi, on a car with UTEC, Tuner, TBE, 272s, MBC, Walbro, ARP HS, Injen Intake/UICP:

91?
95?
104?

Looking at my first UTEC log on 104 octane I'm seeing ~10.5 AFR between 5500-7500. Seems rich for 100+ octane.

TIA
91? 11.0-11.1
95? 11.5-11.6
104? 11.7-11.8

It is relative to boost also. Don't expect 30-32psi on any of those octane fuels not to knock. Yes, the stock turbo is capable of 32-33psi spikes. I have logs.
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