AFRs for Launch Control / Free Revving

s300 and SManager software questions & answers
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Furble
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Joined: Fri Jun 12, 2020 12:55 pm

AFRs for Launch Control / Free Revving

Post by Furble »

Is it typical for AFRs to be quite lean when free-revving / setting up for a launch? For me it's all column 2, the further down it I get the leaner I go when free-revving yet if I hit those cells in any gear the AFRs are fine.

I know when accessing the launch limit it does the fuel & or ignition cut and thus combustion is cut and that will obviously come out very lean, but for example if I hold the accelerator down enough to sit at 4k (before the launch limit) with the clutch in I'll get a very lean AFR like 17:1 in the same cell that would be right on my AFR target if the car were in gear.

Not that I make a regular practice of this but concerned if this is not typical, I just wasn't sure.
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Spunkster
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Re: AFRs for Launch Control / Free Revving

Post by Spunkster »

It will run at a different load when free revving that when there is any load.
Furble
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Re: AFRs for Launch Control / Free Revving

Post by Furble »

How concerned should I be with the very lean AFRs during free revving?
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Spunkster
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Re: AFRs for Launch Control / Free Revving

Post by Spunkster »

I would not be that concerned.
Furble
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Re: AFRs for Launch Control / Free Revving

Post by Furble »

Thank you
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