Moving from Vortec MPFI poppet design to EV6 injectors

[onegonewild]

I have changed the intake setup on my 1997 Vortec 350 to the marine version that requires individual injectors. I have purchased 27lb EV6 version injectors commonly found on the Gen IV LS engines. Do i need to modify my injector tables other than the flow rate?

I'm having a battle with starting issues and i believe this is where the issue is.

Thanks

9527

[ChipsByAl]

Yes, if you know what engine the injectors came from, you can change the data to your current file.
Al

[onegonewild]

Well i know they are replacement injectors for the LS2 engine. This came in GTOs, Corvettes, etc. but not with the current operating system I am using. The tables just dont cross right over. Anyone have an OS of 12212156 with ls2 injector tables??

Any help would be great guys! Thanks!

[joecar]

If you post the LS2 file, the injector tables can be made to fit into 12212156 (interpolation required).

There are 4 tables that can be made to fit like this.

[onegonewild]

There is two files. Hope this helps.

[joecar]

I'll have to do it later tonite.

[joecar]

I got home too late last nite... so give me a day or two (unless someone else jumps in).

Here's how I do it: I paste the E38 table in a graphing program (DPlot), I tell it to interpolate (poynomial) with dx=0.001, then I tell it to interpolate (linear) with dx set to the LS1 table's axis spacing, and then paste this into the LS1 table.

For the voltage correction table, the interpolation has to be done in 3D, or in two directions.

[onegonewild]

I'm in no rush! Thanks for the help!

[onegonewild]

Just wondering what the effects of not administering these changes to my current tune? Basically, what am i suffering from with my current tune?

[joecar]

What is the flow rate of your old injectors...?

Also, since you have the calibration file that used the new injectors, it is good to copy as many injector characteristic tables as can be copied... there are 5 such tables... some of those are easy to copy, a few of those have complex curves so need interpolating to fit into LS1/12212156.

IFR directly affects the fuelmass calculated from airmess (VE and/or MAF), this gets corrected by the LTFT's during closed loop... so the effects will be seen in open loop.

Before doing any tuning it is always good to set the injector tables to match the injectors used.

[onegonewild]

The flow rate has been corrected already to the new 27lb at 43.5psi. My rail pressure is roughly 55psi. These are the settings I am questioning:

B4006, B3701-004, & B4002-005

[joecar]

Yes those other injector tables improve fueling behaviour during transient throttle/airflow conditions (i.e. dynamic fueling).

[joecar]

Is your FPR manifold referenced or un-referenced...?

[onegonewild]

Its vacuum referenced. Its an FPR from a 1997 corvette which specs out at 55psi at idle.

Now that you mention that I think i see an issue with the IFR!

[joecar]

With a manifold/vacuum reference FPR, your IFR table has to be flat same value all across (i.e. the same value for zero vacuum in all cells);

you may still want the other injector characteristics tables.



Measure pressure with the FPR reference temporarily open to atmosphere...

or, do you know what MAP was when you measured pressure...?

More info::
Understanding the IFR Calculation:
showthread.php?t=4821 (http://forum.efilive.com/showthread.php?t=4821)

[onegonewild]

Thanks!

I get 60 psi with WOT

[onegonewild]

Will we need to change all 8 tables?

[joecar]

Will we need to change all 8 tables?It seems to me that only 5 tables might be able to be ported... the other tables have different units so they won't port over... I'll take a close look at it over the weekend.

[onegonewild]

How's this comin along, Joecar?

[joecar]

How's this comin along, Joecar?Give me another day or two, everything's out of control all around me :doh2: , I'm sorry.

[onegonewild]

It's cool! Thought you forgot about me! No rush.
Thanks

[joecar]

Here is your file with the tables that could be interpolated/copied:
B3701: simple copy (ignored columns above 18 volts)
B4002: simple copy of 1.000
B4003: required interpolation
B4005: required interpolation
B4006: simple copy

And of course you already copied B4001, I left that unchanged.

[onegonewild]

YOU DA MAN!!

Thanks for the help! I appreciate it!
I will keep you informed how it works!