lt1 ee Injector tables

[kur4o]

Hack was done long time ago but I didn`t have the time to test.
After I changed oil due to fuel contamination, I managed to idle the car with the patch at 3 bar with the vacuum disconnected. It runned real smooth and the afr was really stable. I put an aeromotive fuel pressure regulator and have plans to bump the pressure to 4 bar if the pump can handle it. It does make some unusual wine when the car is turned off.
Initial version is only for auto bin. It may need some tweaking. I hope the PCM is fast enough to handle the dynamic fuel flow calculations. Otherwise I will have to move the patch at different locations and test untill sufficient results are obtained.
I had really hard time interpolating injector data. At least I have the tables done for the ls1 injectors with part number #???#, I will dig it later.

I did research ls1 fuel system. 97 ls1 corvettes have a fuel pressure regulator on rail at 4 bar, no vacuum applied. Later years they moved it to fuel filter. Ls1 f-bodies have fuel pressure regulator in tank and the return line is close to the tank with a t-union.
So ls1 is indeed a return system. The return line is not on the rail though.
It is missing the vacuum reference at the regulator and the PCM calculates the dynamic fuel flow based on manifold vacuum. If you have the correct calibration data it is much more accurate and predictable.

[kur4o]

After initial testing was done, I made a slightly modded version that works with all cars.

Any input will be appreciated.

Installation notes.

Install all patches in the folder. Save bin. Than you can modify the tables if you need to.
Stock calibration data that is loaded is for stock Gm injectors part number 12554271 at 4 bar with vacuum reference disconnected.
Values are taken from 98 PCM calibration and interpolated to suit new tables size.

I hope someone with great excel skills can make a spreadsheet to interpolate data between different formats.
Manual interpolation is possible but it took me two days to accomplish.

[kur4o]

Does anybody knows el cheapo Factory GM flex fuel sensors or fuel pressure sensors, part numbers, usage, and what signal they produce?

Thanks

[vilefly]

I have a chart of pressure transducers from various brands that is rather complete, but I have the printout at work. Will have to check back monday, but in the meantime, I have this ebay link that allows you to select various ones with very detailed descriptions on thread, voltage output, and measurement range.

https://www.ebay.com/itm/Pressure-tr...-/132258293597

and they are cheap as you can get.

[kur4o]

Thanks for the link.

Meanwhile I found some good delco candidates.
https://www.amazon.com/ACDelco-13579.../dp/B00HQSPFYK
https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1
These are used on later model camaro, impala and others. After 2012 MY.

It has female thread and I need somebody to confirm that the thread is the same as the schrader valve on the lt1 rail.
If it is the same thread, it will be direct fit and easy hook on some of the free ad channels.

[dzidaV8]

I've made a little spreadsheet to interpolate between the injector data, it hurts me to read that you had to do it all manually ;)

Fill the tables with data from LS calbration on LSx Data tab, and the $EE Data tab will update automatically.

Enjoy!

You have to install XonGridd Excel add-on first, for the interpolation functions to work!

[kur4o]

Thanks alot. It will save alot of times. If you have data for others GM or Ford stock injectors, we can make a different preset data for them.

I am still trying to revive old laptop with excell to test it. Do you know what version of excell this add on will work with.