Injector Offset ?'s vs LS1 edit

[bink]

is that 36 ls/hour@58 psi or 43.5

Neither, that's at the GTP pressure (48 psi?).
From the Bosch Motorsport Catalog, that Marcin found they are:

34.54 lb/hr @ 43.5 Psi ( 3 Bar)
39.89 lb/hr @ 58.02 Psi (4 Bar)

Cheers,
joel

[WicketMike]

Neither, that's at the GTP pressure (48 psi?).
From the Bosch Motorsport Catalog, that Marcin found they are:

34.54 lb/hr @ 43.5 Psi ( 3 Bar)
39.89 lb/hr @ 58.02 Psi (4 Bar)

Cheers,
joel

so what numbers would you put into the spreadsheet 39.89 @ 58.02?

and what about 42lb injectors?

thanks!!!!

[Tordne]

I have been watching this thread for a while hoping for the silver bullet that suddenly made all the injector tables make sense, especially the Voltage Offset table. Sadly it appears that it is still a bit of a black art.

It would be nice to be able to produce a map that essentially used a factor (similar to BEN) to map out the correct Offset table.

Anyone?

Cheers,

[MN C5]

Without the performance characteristics of the injector coil you wouldn't be able to calculate the injector offsets. It's really not a black art, the unknown value is the reluctence of the injector coil at various voltages. Could be that some manufactures cheat the larger injectors by changing the offset value.

[bink]

so what numbers would you put into the spreadsheet 39.89 @ 58.02?

and what about 42lb injectors?

thanks!!!!

39.89 lb/hr = 5.026 g/sec.
This is the flow rate at 0 kPa Vacuum (101.3 kPa atmospheric).

Here are the values I use:


Injector Flow Rate (Grams/Second)
Manifold Vacuum kPa Value
0 kPa - 5.031250 g/sec
5 - 5.093750
10 - 5.101563
15 -5.148438
20 - 5.179688
25 - 5.203125
30 - 5.218750
35 - 5.250000
40 - 5.304688
45 - 5.335938
50 - 5.359375
55 - 5.375000
60 - 5.406250
65 - 5.421875
70 - 5.468750
75 - 5.484375
80 - 5.539063

Cheers,
joel

[bink]

Without the performance characteristics of the injector coil you wouldn't be able to calculate the injector offsets. It's really not a black art, the unknown value is the reluctence of the injector coil at various voltages. Could be that some manufactures cheat the larger injectors by changing the offset value.

And you also have tables B3702, B3703, B4001, B4003, B4004 and B4005 - which all seem to be injector specific.
I wonder if RC Engineering. or similar injector service co., can determine these values when they flow and blueprint??


joel

[joecar]

If there was a means of measuring and correlating the mechanical motion and the electrical waveform
for opening and closing of injectors, that would clear all this up...

[MN C5]

And you also have tables B3702, B3703, B4001, B4003, B4004 and B4005 - which all seem to be injector specific.
I wonder if RC Engineering. or similar injector service co., can determine these values when they flow and blueprint??


joel

Good question Joel, I wonder if they could. You'd think they certainly should have the answers.

Perhaps because the values being dealt with are so small (millisecounds) that changing some of the other values has little affect on how the injector performs.

[TAQuickness]

Unless I missed something, I don't think you need a MAF to do this. Just to make sure my foot doesn't fit in my mouth, I'm gonna go try a few things before I elaborate too much.

[turboberserker]

A way around this may be to look at a peak and hold injector driver. I went with an acceleronics versafueler, which allows me to run stock offset tables (Perhaps with minor tweaking down the road) and get very high quality, low pulsewidth performance from the new 72# delphi (low z) injectors. As of my last drive this morning, I am sometimes seeing a steady 1.7-1.8 pulsewidth at decel and idle. From a fuel point of view, it is almost like my wife's stock Avalanche (you have look past the cam bumpin )

I ran the truck briefly (~15min) at idle with the old 60# motos and it was smoother than without the versafueler for sure... My idle AFR was 15.0 without the device, and 13.8 after installation (and no change to the tune file) -- thats pretty good pulsewidth that could be reclaimed.

The driver works with either high or low z injectors.