Working on my tune some more. VE table is dialed in. I'm struggling with transient fuel (tip-in or accelerator pump on a carb). When I goose it, the wideband very momentarily goes offscale lean then just as fast swings rich, down to 11:1 or so before coming back to stoich. As a result, the truck bucks a little bit if you stab it.
I know there's a parameter to adjust that would correct this, but I'm having trouble figuring out which one. Changing FN1303 (accel enrichment) by up to 50% plus or minus doesn't have a noticeable effect. Do I need to try FN1321? Is there another parameter to try?
Tip-in fuel
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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
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decipha
- Posts: 6296
- Joined: 2021 Feb 15, 12:23
- Location: Metairie, LA
- Vehicle Information: Work Truck
'25 F-150 5L
Re: Tip-in fuel
thats a misfire from flooding out from too much accel enrichment
sounds like you need to reduce it significantly
sounds like you need to reduce it significantly
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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
Re: Tip-in fuel
Hmmmm. I hadn't considered that. Like I said, I did try messing with FN1303 significantly in both directions and it had no discernable effect on anything.
Just out of curiosity, what's the difference between FN1303 vs FN1321 with respect to how they affect function of the engine?
Just out of curiosity, what's the difference between FN1303 vs FN1321 with respect to how they affect function of the engine?
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decipha
- Posts: 6296
- Joined: 2021 Feb 15, 12:23
- Location: Metairie, LA
- Vehicle Information: Work Truck
'25 F-150 5L
Re: Tip-in fuel
accel enrichment is based on throttle movement
transient is based on load changing
transient is based on load changing