Dead time

[Ugly56]

Running a 6.0 58x and am trying to get injectors setup. Running Bosch 95lbs. Do I just input the data sheet at the psi fuel pressure I'm running or is there a formula? Attached is the data sheet

[kaeman]

You need to give us more info. what unit are you using ms1, ms2, or ms3? post your msq. If you are running the ms3 then you should do the injector testing and put in the real numbers you get from doing the testing.

[Matt Cramer]

Also - that chart is missing the top that would show what the numbers actually mean.

[Blue Coupe]

I am very interested in understanding what real numbers need to be captured and how? I reviewed the MS3 Set-up, MS3X357 hardware and TS manuals, how to enable a test from TS seems to be clear. I cannot seem to find an clear end to end MS3 procedure as to what to test, if special tools are required i.e. oscilloscope, flow bench etc and what to capture for the injector Deadtime test.

Thanks!

You need to give us more info. what unit are you using ms1, ms2, or ms3? post your msq. If you are running the ms3 then you should do the injector testing and put in the real numbers you get from doing the testing.

[jsmcortina]

The test mode is a bit simpler to use now, but the principle is the same.
See https://m.youtube.com/watch?v=lJgi8l-2XG4

James

[Blue Coupe]

Excellent link!
Thank you!

The test mode is a bit simpler to use now, but the principle is the same.
See https://m.youtube.com/watch?v=lJgi8l-2XG4

James

[lutorm]

Speaking of measuring the injector performance, I did this with my injectors and discovered that I got slightly different values depending on how long the injector was *closed* between each injection event, unless the closed time is much longer than the open time (which it likely won't be during a WOT run.)

I assumed this had something to do with "fluid hammer" in the injector, causing the pressure against the pintle to be higher for some time after the injector has closed (because the flowing fluid needs to be slowed down). But it brings up the question of what the most appropriate cadence to use when testing is. At the very least, if you inject much slower than the max rpm the engine will see, you might be thinking you get less flow than you really do.

[Blown88GT]

I am very interested in understanding what real numbers need to be captured and how? I reviewed the MS3 Set-up, MS3X357 hardware and TS manuals, how to enable a test from TS seems to be clear. I cannot seem to find an clear end to end MS3 procedure as to what to test, if special tools are required i.e. oscilloscope, flow bench etc and what to capture for the injector Deadtime test...

I have the same injectors as you Blue.
Ford Motorsport M-9593-BB302

https://performanceparts.ford.com/parts ... -bb302.pdf
They've been around for a long time, was sure they've been tested by many & here it is:
http://injector-rehab.com/shop/lag.html
This looks like a copy of the same table:
http://www.turbochargerkits.com.au/efi- ... ell-times/

No 30's but the Ford Motorsport 36's should be very close.
I've been using the default dead time of 0.900ms, the 36's are 0.530ms @13.0V
30's would be real close to 0.500ms @13.2V
Battery voltage correction of 0.200ms/V is good.

Am hoping this will give me a more stable idle.
However,

Beware that dead time numbers can only be used on identical hardware. If the injector driver circuit is different, the deadtime can be different too.
James

[Blue Coupe]

These are my settings;

Percentage 220.0 185.0 127.0 92.0 75.0 60.2
Voltage 7.2 9.6 12.0 14.3 16.8 19.0

I'm not certain why TS uses percentages, just seems to make more work while all tables I've seen are not in percentages.

[Dennis_Zx7r]

I'm not certain why TS uses percentages, just seems to make more work while all tables I've seen are not in percentages.

Here's a little spreadsheet I made for this conversion.

The left part converts measured deadtimes to their corresponding percentages for the MS3 table.
Put in the voltages you want to generate data for into column A. I selected row 6 as 100% (no correction), in this case 13.2V as I upgraded from MS2.
After that, put the deadtimes you measured for the respective voltages into column C.
The resulting percentages will show in column B. Voltage and Deadtime [%] are next to each other on purpose, you can just mark and copy them for TunerStudio if you use the dot as decimal separator.

The right part may be of use when upgrading from MS2 to MS3, or to extrapolate linearly if you have only a few datapoints.
If you want to use this, put in the voltages you want to generate data for into column E. Put the measured deadtime [µs] at your 100% voltage into G6 (13.2V when upgrading from MS2), and the BattVoltCorr [ms/V] you previously used or want to extrapolate with into E10. As a control, the calculated deadtimes will be shown in column G. The resulting percentages will be shown in column F. As with the left part, you can copy&paste columns E&F into Tunerstudio.

https://dl.dropboxusercontent.com/u/106 ... rcent.xlsx

[Blue Coupe]

Thanks Dennis!

I'm not certain why TS uses percentages, just seems to make more work while all tables I've seen are not in percentages.

Here's a little spreadsheet I made for this conversion.

The left part converts measured deadtimes to their corresponding percentages for the MS3 table.
Put in the voltages you want to generate data for into column A. I selected row 6 as 100% (no correction), in this case 13.2V as I upgraded from MS2.
After that, put the deadtimes you measured for the respective voltages into column C.
The resulting percentages will show in column B. Voltage and Deadtime [%] are next to each other on purpose, you can just mark and copy them for TunerStudio if you use the dot as decimal separator.

The right part may be of use when upgrading from MS2 to MS3, or to extrapolate linearly if you have only a few datapoints.
If you want to use this, put in the voltages you want to generate data for into column E. Put the measured deadtime [µs] at your 100% voltage into G6 (13.2V when upgrading from MS2), and the BattVoltCorr [ms/V] you previously used or want to extrapolate with into E10. As a control, the calculated deadtimes will be shown in column G. The resulting percentages will be shown in column F. As with the left part, you can copy&paste columns E&F into Tunerstudio.

https://dl.dropboxusercontent.com/u/106 ... rcent.xlsx