Hello again, I have a feeling that the answer is out there, but for the life of me cant seem to find this data online anywhere. Im basically trying to splice my EBL flash 1227747 based Ecm into my 1999 Vortec 5.7 wiring harness. I want to do this in a way that if possible, I could retain my Vortec Obd2 systems sensors and diagnostic functions for more accurate diagnostic codes, and have the EBL run the engine managment.

Im not ******* the EBL in any way...that is the only reason I took on this project. The EBL is the most user friendly, gm based system ive found on the market, and I love it. I want the user friendly tuning features the EBL has to offer, but retain OBD2 diagnostics, such as, multiple cylinder misfire detection, ect. .

The engine will be a vortec 5.7 with a 218 duration cam, holley stealth ram intake, 42 lb injectors, dual walbro intank 255 pumps, and twin T04E turbos @ a 5 psi start point.


Can I accomplish this, or am I completely off in my thinking? In theory I think it could work. The only real question I really have is... What is every single wire that needs to be SPLICED or connected to my EBL. I seem to have a LOT of wires left behind from my TBI harness to splice over to the Vortec system.

Do I need to keep the fuel pump relay and wiring from the EBL over to the new truck, or keep the original wiring from the stock vortec pcm?

You know, I have questions like that, I just dont want to post all my questions at once.


Please help if you can, I am a learning tuner...and appreciate all the things you guys do for this sport to keep it moving.

Thanks for any info-89377stroker

 

It will be tricky getting the two system to play nice together. The fuel pump control can stay with the VCM (vehicle control module). Will need to add a second CTS & IAT sensor, they can't be shared and both the EBL & VCM require them.

Can also add a 2 or 3 bar MAP sensor just for the EBL.

Note that I'm looking at a VIN R wiring (5.7l) for a '99. Not sure if that is correct.

The TPS signal can be shared. The VCM handles the hall effect crank position sensor. May need to use an older style small cap distributor and ICM to interface to the EBL ECM.

The EBL should get the Port Mod. If the injectors are 14.5 ohms or more they will work without it. But still better with it as it also changes the injector firing rate.

For an O2 signal just use one of the front ones to the EBL, can be shared.

Not sure what to tell you about the EGR or AIR system. The EBL won't handle either as the stock EGR is a linear unit. Then again, with twin turbo's they just may be going away.

Note that there are EBL wiring diagrams on our web site.

RBob.

 

Thanks Rbob, always a clean and to the point answer, helps many of us out to our ignorance in these systems.

A few more questions if your up to it?


Now, im looking at your wiring diagram for the ebl, and comparing it to my pinout for the vortec... I see that the VSS goes into a "buffer" module to be processed. My question on this is, Can one of the two outputs from the module (spedo) or (ecm output) be shared to the ebl for VSS sensing?


My second question/comment is.... I ohm checked my injector resistance, and each injector individually ohms at between 15.1-15.3 ohms, multimeater set to 2k. When I ohm all injectors together (dont know if this is the way the ecm sees resistance, so I checked it anyway) I get 002, no decimal, thats the way it reads on the multimeater.

You mentioned if the injectors ohm higher than 14.5, that the ebl can run them without the port mod. Ive read that this may be a problem possibly due to the injector opening being to long and it fights back against the system? I belive thats how I understood it atleast. I wont be running this thing to 6,500rpm or anything close to that, id like to stay around 5,200-5,400 for a shift point.

Do you see the injectors at least working efficently enough to keep up with this motor, or do you recomend I just send my ecm to you for the port mod, be honest I want it DEAD right the first time, and its not going in anytime soon. I dont mind spending the insanely low $25!!!! you charge for the port install. But if you belive that it will work, your word is what I will take.

What would be any drawbacks to not doing the port mod on this specific type of forced induction motor, if any?

Thanks for any info...89377stroker

 

For the VSS, likely the wire to the speedometer can be shared.

With the injectors at 15+ ohms, the drivers won't peak off before they open. That is the issue when the resistance is lower.

On the EBL Flash ECM four injectors get wired in parallel on each driver.

They will still fire either twice or four times as often as they need to. This cuts into the available time and increases the duty cycle.

RBob.