Low PW Compensation

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Posts: 11
Joined: Tue Feb 22, 2011 7:53 am

Re: Low PW Compensation

Postby ShorTuning » Fri Mar 08, 2019 9:10 pm

The new low PW compensation is setup similar to the stock GM ecu stuff which IMO is the best way to characterize the injectors.

First off the flow rate will be different and voltage dead times/offsets will be different when using this model.

Flow rate is to be defined as "ideal flow rate". Meaning you want the injector slope of the linear range of the injector. Usually you can take an injector flow rate at 4ms, 6ms, 8ms, plot it out and find the linear rate. That will be the flow rate at that pressure delta. Pressure delta is another one that is best implemented as the primary axis of your flow rate table. It takes the fuel pressure and subtracts the MAP value from it to give you a final resultant pressure the injector will see.

Offsets, these are determined not by the time it takes to get a drip of fuel from the injector but rather it is the intersect point of the linear flow rate slope. This is what I call "ideal offset". These values will need to be taken at various voltages and pressures to get the information. Or use Injector Dynamics, Fuel Injector Development, Fuel Injector Clinic etc because they will supply GM calibration data that can be used.

Low PW compensation. As most know there is a un-linear portion at lower pulsewidths which usually occurs below 3ms on most modern injectors. This value is the difference in time to the ideal linear flow rate.

As you can see in the illustration below:

Injector Flow.png

Posts: 8
Joined: Sat Dec 21, 2019 7:27 am

Re: Low PW Compensation

Postby charlieye » Sat Dec 21, 2019 7:31 am

Any official instructions on how to configure the low pulse width compensation with ESP?

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