Matts440
Well-Known Member
Well with turning up the fuel psi now I go way rich at 4k so time to take a lot of fuel back out.
67 twin turbo dart
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racerjoe
Well-Known Member
Sounds like you found the problem. I bet the flow curve on those injectors isn't linear when below the specified psi. I would continue to monitor psi, and duty cycle just in case. Good luck!
Matts440
Well-Known Member
Yeah working on getting a gauge set up, and wrote megasquirt to see where it might be on their program for data logging.
Pressure Transducers
I use one of these wired to my MS3 to log fuel pressure.
I use one of these wired to my MS3 to log fuel pressure.
Matts440
Well-Known Member
I think it’s an analog input I had to configure and label. I can look it up for you later when I’m in front of my laptop.
Matts440
Well-Known Member
I tried doing that set up and even check to see which wire Mad dart used for the fuel pressure sensor and that wire is not listed on the drop down list.
Matts440
Well-Known Member
Thanks, when you data log do you use the high speed one or the data log tab at the top? I've been using the high speed one and it only shows ign and spark.
racerjoe
Well-Known Member
You need to figure out what analog input the fuel psi is connected to. Use the data log tab at the top. Make sure you are recording that analog input in the Data log Profile editor. After you collect the data, you can open the file with mega log viewer and check out everything that was recorded.
Matts440
Well-Known Member
Yeah I've been using the wrong one, insert forehead slap emogi, next time I'm out I'll use that one, I looked at that one and what it logs and it shows fuel pressure, I know its wire spare abc, checked that last night. Thanks for the help.
The Lowdoller fuel pressure sensor is configured in analog inputs. Once enabled and labeled you should be able to capture it in your logging and view it when importing the log into MegaLogViewer. If you haven't already, I recommend buying the licensed versions of both TunerStudio and Megalogviewer. The extra features are worth it.
Matts440
Well-Known Member
I do have the license of tuner have not done the mega viewer yet now I know where to look I'll check it out when I get home tonight make sure its in and ready for the next drive.
Hemirunner
Well-Known Member
I’ll never understand why these ECU’s can’t compensate for fuel pressure given the fact that fuel pressure is an input to the ecu and the rest is just math to calculate injector pulse width.... sigh... lol
Matts440
Well-Known Member
True or come up with a electronic fuel pressure regulator that it can just adjust the pressure as needed
TT5.9mag
Two atmospheres are better than one
If you have the o2 correction percentage set high enough it will compensate for dropping fuel pressure. But I’m sure you knew that.
Matts440
Well-Known Member
Didn't get around to driving the dart this weekend to check the new setting I uploaded, but did have some proud daddy day with my oldest working on his motor for the 68 Valiant we picked up for him.
What it's all really about. Proud dad moment indeed.
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