EFIDynoTuning Forum

Doing DIY tuning to learn, gotten what I feel like is a solid tune from the write-ups.

Doing some searching I found that injector data being wrong or not dialed in would be the culprit for my fuel error between gears. I am running Siemens Deka 60#@43.5psi FI114961 injectors with the inj data found from: https://www.usa.vdo.com/media/747298/fi ... ksheet.pdf

Something to note as well: Fuel pressure is 39psi iirc stock 96 cobra setup, so I am unsure if the data would be still be the same or need adjustment due to the test data being at 43.5psi? What's entered into tune is of course not scaled, keeping it simple and straightforward solely for the question.

Low slope: 63.6956424
High slope: 60.6865752
Breakpoint: 0.0000318069
Min PW: 1.312070161

vs what's entered into tune:

Low slope: 63.697 (0.0013576 difference)
High slope: 60.687 (0.0004248 difference)
Breakpoint: 0.00003180
Min PW: 0.00000 (stock for cdan4/llx3)

The difference is due to resolution for the data points. I am unsure if this calibration/strategy-specific or specific to the ECU.

Voltage offsets are as following but I had retained stock:
15v 0.4066
14v 0.4879
13v 0.5992
12v 0.7059
11v 0.8367
10v 1.0174
8v 1.5462
6v 2.756084309

• Do I need to set Min PW if idle causes to be entirely too rich?
• Do I need to adjust high / low slopes due to what's entered into the tune being slightly off?
• What about voltage offsets? Like the above, the Y resolution is 0.0313 which means at 12v the voltage offset would be 0.7188 instead of 0.7059. Close enough and see what happens or will they need to be dialed in as well?

data is on the homepage

k constant has to be 30

minpw ahould be 0.099 their data includes the offset

By data are you meaning fuel injector data is? I see the FRPP - LU60 Siemens Deka @ 40psi, wanted to verify if that's what you meant is the correct data for my injectors

Does k constant go by another name perhaps? Probably going to abandon BinaryEditor for diy at this rate.

The LU60 is the siemens 60. The data is for stock Ford fuel pressure.

dleach1407 wrote: ↑2023 Apr 20, 20:42 The LU60 is the siemens 60. The data is for stock Ford fuel pressure.

Thanks.