WTB-multiport intake for vortec head 5.7

[dfarr67]

I had no issues with the kit- but injector drivers were were an problem for some.

[dave w]

I had no issues with the kit- but injector drivers were were an problem for some.

The injector drivers inside the 16197427 are SOLID ELECTRONICS! I would accept a more accurate statement: "some tuners have problems figuring out the INJECTOR PARAMETERS for the injectors being used."

dave w

[dfarr67]

The injector drivers inside the 16197427 are SOLID ELECTRONICS! I would accept a more accurate statement: "some tuners have problems figuring out the INJECTOR PARAMETERS for the injectors being used."

dave w

7747 ecu, this is what Howell told me at one time. With the EBL/7747 there is a schematic that shows injector wiring being tied together (from memory) which I did not do and have had no problems.

At the time with vortec heads on a standard block, poor tune, 255 hp to the wheels in a 4x4 auto. Cannot remember cam.

[dave w]

On the topic of injectors and injector drivers. It can be very challenging, when a tuner does not fully understand the differences between a peak-n-hold vs. saturated injectors. With a good electronics understanding, a tuner can effectively use peak-n-hold injector drivers to effectively operate saturated injectors.

It's very common for an EFI project to be low in cost, and provides better than stock performance. The 1227747 is low cost, the 16197427 is low cost. Sometimes the cost of the EBL system is more $$$ than the entire budget for the EFI project. Sometimes a low cost EFI project combined with a poor understanding of injector types, injector driver electronics, and the injector parameter programming in the chip will lead to the conclusion "injector drivers were were an problem for some"?

dave w

[dfarr67]

Those Edelbrock systems are quite old I think, techniques always change. If I were to do it again the 7747 wouldn't fly, either the 7427 or 0411 even for just the electronic trans control. The impression I got on the drivers is that they were overloaded and damaged. I was having problems with solder joints from the TBI injector harness to Edelbrock MPI harness- Howell refused to put an injector harness together for me.

[Fast355]

Those Edelbrock systems are quite old I think, techniques always change. If I were to do it again the 7747 wouldn't fly, either the 7427 or 0411 even for just the electronic trans control. The impression I got on the drivers is that they were overloaded and damaged. I was having problems with solder joints from the TBI injector harness to Edelbrock MPI harness- Howell refused to put an injector harness together for me.

Edelbrock just did not wrote a very good program in the chips they shipped. Especially for the 93+ trucks. I have fixed several of them. I also ran a GM TPI with the 7427. I also ran the TPI with an EBL without port fuel mod.

[dfarr67]

I bought that MPFI kit brand new at the time- expected it to be a little more solid- you say quality of tune and I remember the literature saying for vortec crate engine only.

[dfarr67]

Edelbrock just did not wrote a very good program in the chips they shipped. Especially for the 93+ trucks. I have fixed several of them. I also ran a GM TPI with the 7427. I also ran the TPI with an EBL without port fuel mod.

What exactly is the 'port fuel mod' ?

[Fast355]

I had no issues with the kit- but injector drivers were were an problem for some.

I have never had an issue with the drivers themselves. I have only run across an issue where I had to bypass the current sense resistors to prevent the driver from going into hold mode used for the Peak and Hold TBI driving method.