An interesting read on redrilled injectors

[eficalibrator]

I've been trying to make the point to the tuning community for quite some time that not all injectors are created equal. Hence, my original article on fuel injectors on my website.

Paul Yaw from Injector Dynamics finally got the time to perform the test that I knew would confirm what I already suspected about redrilling. Simply put, the idea that "you can just use the original offsets and short pulse adjust values with modified injectors" is bullcrap. Read Paul's article for the details.

The short story is that there is indeed a very significant shift in offsets and short pulse adjust values that comes with changing the orifice plate. Get these wrong and you'll find yourself baking a lot of unnecessary changes into your MAF, VE, and idle control tables.

[GAMEOVER]

Good read...

[redhardsupra]

Paul and Greg, THANK YOU!

Short Pulse Fueling tables and such are there to make up for the particular physical characteristics that show up as the nonlinear portion of the injector flow. If you change the physical characteristics (I think drilling holes counts as such), wouldn't then all the numbers whos entire purpose in life is to describe these nonlinear oddities, have to change accordingly? Why is this so hard to understand?

[injectordynamics]

I don't think it is hard to understand. I think it just needs to be presented with real world data so that it is more than an abstract concept. I get frustrated sometimes because these myths still exist. Fact is, I just need to quit bitching, and get off my ass and do the work so that people can see it.

The emails coming in within hours of posting the article make it clear that people understand it now. I'm glad you liked it.

Paul Yaw
Injector Dynamics

[samh_08]

So what injector are we supposed to get if we need bigger ones? Sometimes stock ones with 'stock' data aren't big enough. Any suggestions?

Great read by the way. Your work is appreciated!

[L31Sleeper]

So what injector are we supposed to get if we need bigger ones? Sometimes stock ones with 'stock' data aren't big enough. Any suggestions?

Great read by the way. Your work is appreciated!

Um.............Injector Dynamics Of course.

[eficalibrator]

All of the Ford Racing Injectors can be used in a GM application too. I have reverse engineered the characterization data from Ford to GM units for these injectors and include that data as part of my professional training material.

The major point here is that it's OK to use new injectors. You just need to make sure you have complete data on them to avoid creating tuning errors from the start.

[joecar]

All of the Ford Racing Injectors can be used in a GM application too. I have reverse engineered the characterization data from Ford to GM units for these injectors and include that data as part of my professional training material.

The major point here is that it's OK to use new injectors. You just need to make sure you have complete data on them to avoid creating tuning errors from the start.

Greg, is that data available on your DVD...?

[eficalibrator]

Greg, is that data available on your DVD...?

Yes, the data disc that comes with the "GM Tuning Beginner's Guide" DVD includes raw injector data for all of the FRPP injectors in GM table format. You may still find that some high-flow injectors require scaling to fit older PCM limits and that some PCMs also have a minimum raw pulse limit (transient fueling) that must also be reduced to allow my data to work properly. The nice thing is that Ford rates their injectors at 2.7bar of rail pressure, so running them on a GM vehicle with 4bar yields higher flow rates and supports more power.

[samh_08]

The nice thing is that Ford rates their injectors at 2.7bar of rail pressure, so running them on a GM vehicle with 4bar yields higher flow rates and supports more power.

So running a Ford injector at 4bar doesn't change anything but actual fuel flow? No adverse changes to injector data?