Sale ends todayGet 30% off any course (excluding packages)

Ends in --- --- ---

EFI Tuning Fundamentals: 2d vs 3d Injector Deadtime Compensation

Watch This Course

$99 USD

Or 8 easy payments of only $12.38 Instant access. Easy checkout. No fees. Learn more
Course Access for Life
60 day money back guarantee

2d vs 3d Injector Deadtime Compensation


00:00 - In the last module, we learned about injector deadtime and how it can affect our tuning.
00:04 We also learned that the deadtime is affected by both differential fuel pressure and the battery voltage.
00:10 This is important because it affects how we would set up deadtime table in the ECU.
00:15 Let me explain this a little more thoroughly.
00:17 In a fuel system equipped with a manifold pressure-referenced fuel pressure regulator, the differential fuel pressure should always be more or less the same.
00:26 It's the fuel pressure regulator's job to maintain a consistant differential pressure.
00:31 This means that we don't need to worry about the differential pressure varying, and we can use a simple, two-dimensional deadtime table that's relative just to battery voltage.
00:41 We simply choose the data from our injector supplier's deadtime data sheet, for the differential fuel pressure we have chosen to run, and enter this into our two-dimensional table.
00:52 This is a little more complex with a returnless fuel system though, where the fuel pressure is fixed.
00:58 In this case, as I mentioned in the previous module the differential pressure changes any time the manifold pressure changes.
01:06 If we want to properly account for deadtime with this sort of fuel system, we really want to use a three-dimensional deadtime table that's relative to both battery voltage and differential fuel pressure.
01:17 Some ECUs may not give us the option for a 3D deadtime compensation table, and in that case we need to accept that the results are going to be slightly compromised.
01:28 If you're faced with this situation, I prefer to use the deadtime data that closest matches the differential fuel pressure you're seeing at idle, as this is the area where deadtime compensation will have the greatest effect.

We usually reply within 12hrs (often sooner)

Need Help?

Need help choosing a course?

Experiencing website difficulties?

Or need to contact us for any other reason?