- Mon Aug 10, 2020 9:49 am
#44685
Maybe I can build a FP ECU from Speedy products to mainly control/ shut the fuel pump on & off during normal driving.
noisymime wrote: ↑Tue Aug 11, 2020 2:36 am Do you mean PWM pump control?He doesn't know what PWM means.
JayCarShopper wrote: ↑Mon Aug 10, 2020 9:49 am Maybe I can build a FP ECU from Speedy products to mainly control/ shut the fuel pump on & off during normal driving.An FP ECU (fuel pump controller) is not a feature of Speeduino at this time. A FPC may be created stand-alone, or coded into Speeduino, or purchased aftermarket. To verify we are on the same topic, an FPC may:
JochemsTR wrote: ↑Wed Aug 19, 2020 7:47 am David, if there is a way to build or get such controller, I would be very interested. In order to have a return-less system I am struggling to solve this with the UA4C...Have you looked at this?
Jochem
JochemsTR wrote: ↑Wed Aug 19, 2020 7:47 am David, if there is a way to build or get such controller, I would be very interested. In order to have a return-less system I am struggling to solve this with the UA4C...@Jochem - there are many uses for FPCs, and your example is common, as are several other needs. In your case, @dazq offered a reasonably-priced minimal unit for fixed pressure control that may do the job for you. More specifics on your use and setup would allow more specific suggestions for design.
Jochem
moonie223 wrote: ↑Wed Aug 19, 2020 8:19 am Pretty much all fords from like 96+ have a FPDM. It's a PWM multiplying fuel pump driver that can switch like 20A.True that, but there are many reasons for using PWM pump control, as we see here from time-to-time. Likely the one of the most common with users here is vehicles with small or non-existent charging systems. Drag racers, motorcycles, scooters, ATVs, etc. In these cases the fuel system is typically regulated by an inline fuel pressure regulator, bypassing excess pump flow when not needed.
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You can have a returnless fuel system, you just need to mount the pressure regulator in the tank and have it atmospheric referenced. That's how all NB miata work from the factory in the USA, and they can all be tuned just fine without advanced fuel pump control.
Only reason anyone working with these levels of standalones should be messing with PWMing a pump is to ...
Have you looked at this?Yes, I stummbled upon this site before. This seems most interesting at this point since I hardly need to modifiy anthing, just putting the FPC between Pump and ECU....
https://www.madhu.com/content/Main/FuelPumpController
JochemsTR wrote: ↑Thu Aug 20, 2020 7:11 am…So the debate is really, keep FP in all modes consistent or not....The general question is if there is advantage to varying fuel pressure to MAP. In your case, it is running well and apparently has reasonable control of the injectors across the full range, so adding MAP reference may or may not help. MAP-referenced tends to provide a "flatter" fueling table as pressure differential is maintained, but do you need that?. It would not appear to be required in this project, so at this point, my perspective is to not complicate more than necessary to reach the goals. Your perspective may be different.
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