Setting injector deadtimes

Would I be able to disconnect my ecu and injector feeds from my pmu temporarily, connect them to a variable benchtop power supply to get measurable dead time values?

Im thinking get the car running in a cell at lambda 1, alter the voltage that ecu and injectors are receiving and then increase/decrease the deadtime value to get me back to lambda 1? Then repeat for other voltages?

You should be able to do that.

Depending on running quality it may be easier to target slightly rich of stoic as you shift and compensate.

Thanks, I get what you're saying. I used lambda 1.0 as an example but essentially any starting lambda could be used, the aim would be to get back to the starting lambda after changing voltage using the injector deadtime settings.

Yes

This type of test doesnt confirm the deadtime is correct, it only gives you the difference in deadtime between the different voltages tested.

For example say you started testing at 13V with the deadtime set to 1.5ms, you adjusted the fuel table so that measured lambda =1, then when you increased voltage to 14V you found you had to reduce the deadtime to 1.1ms to get lambda back to 1.0 again, that only tells you the deadtime at 14V is 0.4ms smaller than the 13V value, the original value that you started with at 13V could be no where near correct.

The other issue is you would likely be doing this test under no load so the injector is operating in PW's where its behavior is not linear.

From memory you have a Link ECU, if so, you would be better to use the advanced injector test function to do 2 flow measurements, you can usually do this on the actual car without any special hardware or engineering with a little bit of imagination. Those two measurements will give you accurate deadtime and true dynamic flow (slope).

I explained the procedure on the Link forum in this post here: https://forums.linkecu.com/topic/24564-ve-at-max-value-but-i-need-more-fuel-suspect-bad-injectors/#findComment-134405 and further down the thread you will find the spreadsheet and pictures of another users setup.

Thanks Adam, I was looking for this post but couldn't for the life of me find it.