Enable Open Loop

A1C calibration can be modified and configured to operate all EFI-SD4x ECUs in 4 cylinder, 6 cylinder and 8 cylinder configurations.
Sevensecondsuv
Posts: 137
Joined: 2021 Nov 08, 22:24
Location: North Central IL
Vehicle Information: 1995 F-250 RCLB with a built 300 and 4-spd running A1C
wbo2_aem_uego

Enable Open Loop

Unread post by Sevensecondsuv »

I see A1C has the following table and scalar, both of which appear to tell the ECM the TPREL setpoint above which to use OL fueling:

FN311 - OL Threshold TPREL

THBP2 - WOT Threshold

My question is how to get it to use OL above a certain TPREL value? Do I need to set one or the other or both? Right now I have THBP2 set at 550 ad counts and FN311 at all 1024 ad counts and I have no open loop (per my datalog I'm seeing ~700+ on TPREL). Do I need to lower FN311 to 550 ad counts to match THBP2?
decipha
Posts: 6384
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'25 F-150 5L

Re: Enable Open Loop

Unread post by decipha »

Yep just set fn311
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