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Im currently trying to solder flex fuel on my DIYPNP. I see there is already a wire coming out of the flex pin goin to the middle of the board (Under the Microsquirt Module). would it be OK for me to splice into that wire to solder it to the options port or would I need to cut that wire completely?
The FLEX input is already being used. Your profile says you have a 1994, so go here https://trubokitty.com/#/diypnpassembly and click 94-95. You'll find that 1V on the ECU pinout is the clutch switch, so your FLEX input is currently being used for launch control. As far as I know, the DIYPNP only has 2 inputs, and one is wired for launch control and the other AC. You'd have to give up one of those to have a flex fuel input, but someone correct me if I'm wrong. Also note that MS2 is only able to apply a scale factor to the fuel and spark map with regards to ethanol percentage, which is not enough to go from E0-E10 to E85 without a tune change. But it is useful when running E85 to run corrections since the actual ethanol content of E85 varies a bit.
The FLEX input is already being used. Your profile says you have a 1994, so go here https://trubokitty.com/#/diypnpassembly and click 94-95. You'll find that 1V on the ECU pinout is the clutch switch, so your FLEX input is currently being used for launch control. As far as I know, the DIYPNP only has 2 inputs, and one is wired for launch control and the other AC. You'd have to give up one of those to have a flex fuel input, but someone correct me if I'm wrong. Also note that MS2 is only able to apply a scale factor to the fuel and spark map with regards to ethanol percentage, which is not enough to go from E0-E10 to E85 without a tune change. But it is useful when running E85 to run corrections since the actual ethanol content of E85 varies a bit.
I don’t ever use launch control nor have AC. Would it be easier to wire the FLEX to the DB ports?
I don’t ever use launch control nor have AC. Would it be easier to wire the FLEX to the DB ports?
Whether you run the wire in through the DB connector or use something in the stock wiring harness, you'll still need to then run the signal to FLEX or PE1 in the MS.
Whether you run the wire in through the DB connector or use something in the stock wiring harness, you'll still need to then run the signal to FLEX or PE1 in the MS.
But would it be okay to splice into that black wire coming out of the flex to the middle of the board?
But would it be okay to splice into that black wire coming out of the flex to the middle of the board?
No, not unless you disconnect it from the location in the middle of the board. That wire right now is connected to your clutch/neutral switch. So every time you press the clutch the flex fuel reading would change, if it worked at all.
No, not unless you disconnect it from the location in the middle of the board. That wire right now is connected to your clutch/neutral switch. So every time you press the clutch the flex fuel reading would change, if it worked at all.
@nickalltogether hey on this thread you say the flex sensor changes when the clutch is used. I'm having this happen to me with a mspnp2. Anytime I use the clutch pedal the flex fuel percentage fluctuates. Is this a normal behavior? All I did to use the flex sensor was wire it like you normally would and send the signal to the launch wire. on the options connector. Anyway to fix this do you know?
DIYPNP Flex Fuel
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