Injector Adjustments

Used on mid 90s mass-air broncos and F-Series trucks. SMD-221 Hardware.
Cal Codes: HOG0, HOG1, TIP1, VEX1, WAY1
big_bertha
Posts: 12
Joined: 2022 Feb 27, 18:50
Location: Houston
Vehicle Information: 1990 Bronco, 351w with MAF swap ('94 computer, calibration DIX0, part number F4TF-12A650-BEA), 36# injectors.

Injector Adjustments

Unread post by big_bertha »

I have TFS-89036 installed and set at 45PSI. I'm following the fueling page in the guide, I've attached a screenshot of the values read from the ECU before modification. Do the AHISL (255.996 lbs/hr) and ALOSL (286.184 lbs/hr) values make sense, or is there a possible mismatch between the adx/xdf and my ecu?

Also, just to confirm, SP**Global Fuel K-Constant is the value to set to 30, as per the guide?
Attachments
fuel.png
decipha
Posts: 4956
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Injector Adjustments

Unread post by decipha »

That all looks correct. If you want to see the stock values you have to open the scaling percentage - do not change scalar and set it to 1.

ADX is only used for datalogging has nothing to do with the tune.

You can only change 1 value at a time in a specific order as specified in the fuel write up on the homepage.
big_bertha
Posts: 12
Joined: 2022 Feb 27, 18:50
Location: Houston
Vehicle Information: 1990 Bronco, 351w with MAF swap ('94 computer, calibration DIX0, part number F4TF-12A650-BEA), 36# injectors.

Re: Injector Adjustments

Unread post by big_bertha »

Not quite sure about how to adapt the fueling writeup to tunerpro, since the SP integral to the definition file. The default values from my ECU for AP** AHISL and SP** Global Fuel K-Constant give a DO NOT CHANGE - Scaling Percentage of 13.3171, but according to the writeup it should be closer to 19#/30?

So to modify the bin with the TFS injector values (HS=38.557, BPT=0.00001284, LS=38.557, SP:38.557/30 = 1.2853), I would:
1. set SP** Global Fuel K-Constant = 30
2. set SP** (WARNING) AHISL - Injector High Slope = 38.557 ? Or scale by SP to 30? Not sure as this param used to calculate the Scaling Percentage param.

3. set SP** ALOSL - Injector Low Slope to 38.557 scaled by SP = 30?
4. set SP** FUEL_BRKPT - Injector Breakpoint (2 of 2) to 0.00001284 scaled by SP = 9.6e-6?

And then would I need to rescale the remaining tables/params (maf curves, SARCHG, etc), or would tunerpro do that for me with this xdf?
decipha
Posts: 4956
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Injector Adjustments

Unread post by decipha »

there is no such thing as scaling with the k-constant

you simply put in the actual values in the order the fuel write up tells you to
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