Common rail diesel discussion thread

diesel1972

Naturally-aspirated

8

01-22-2020, 05:54 AM #92

First of all credits to baldus building and reengineering his diesel ECU from existing diesel engine control strategies. Finally we can get a decent priced aftermarket ECU and what’s in the software makes me happy able to run a basic diesel set-up having a lot in there to get things really working also able to set-up input filtering on analogue inputs for example so we can make a brave attempt to run some of the 3L OM CR engines over 1Kn toque slamming in some massive big injector and a decent size CP3 for example without the PID going metal over rail pressure fluctuation.

Also reading the conversation about small thing that are not really relevant on using mg/stroke or mm2/stroke as the difference is only 0,84 if you take fuel mass per 1000cc and compressing the same diesel fuel close to 3000Bar you end up with about 1Kg/L depending on the impurity of the fuel that make it able to compress a lot so where dos this all go in the calculation of things? And do you need to take action on that part?
Same goes for air temp correction trying to deal with airmass/stroke while you got a ton of oxygen left on hi end RPM unable to burn it all due to small injectors size poring out loads of smoke as for late end of injection or running out of fuel delivery from the CR pump dropping fuel rail pressure also running old type injector with load of return fuel eating away some of that engine power.

Things to ask for should be can we have a injection angle calculation so we know start en end of injection getting a better picture on what is going on not having to calculate all thing things our selfs.
Same goes can we have a EGT fuel reduction option with or without a PID loop or can we make this our self as the software has some options for it?

Depending on what your goal is just having an engine transplant and able to run it with aftermarket ECU to getting some decent power making changes to the diesel injection hardware able to go back to basic on things making it possible to dial in the correct numbers to make them work.
Are there real diesel tuners out there or are they all get the job done by trail and error putting in some timing and mg/stoke in some places and dos a aftermarket ECU get them out of their comfort zone.

This is what landed on my desk some days ago. Hope to find some time to build a wire loom so I’m able to hook it up to one of our diesel test system and start validating injector coil control on some of these injectors and ones that’s done find a small industial engine and run some load test on the dyno getting the feel on fuelpump control and so on.
Got tons of ECU maps for OM Mercedes BMW Cummins QSB/ISB some Duramax from 2.5L to V8 ones Wink