1990 Chevy silverado Z71 5.7 TBI EFI, vortec heads with CSFI conversion. NEED HELP!

[ony]

did you use a 98 fuel punp? they have 60-65 psi when turning on the key.

[Hog]

If you are running a clear see through distributer cap, you don't need the scan tool. The stock CMP retard spec is Plus or Minus 2º.

I'm confused, are you running the blackbox PCM as well as the old TBI ECM at the same time? What did your tuner solder into, the TBI ECM or the blackbox PCM?

If you are running the 1996-99 Vortec blackbox, you cant adjust timing advance with the distributer, it must be adjusted in the calibration. You can only adjust the Camshaft Position Sensor (CMP) retard by loosening the distributer and clocking(twisting it) to get the + or - 2º spec.

https://www.youtube.com/watch?v=4G9_aCu2Bgw

https://www.youtube.com/watch?v=f9tjjxyEnbY

The only reason for the CMP retard adjustment is to prevent adjacent cylinders from crossfiring.

peace
Hog

[Hog]

That is an important part about the Vortec CSFI fuel pump, it will make over 90psi when dead-headed, and the CSFI regulator brings that down to 66 psi at atmospheric pressure. 66psi= approx. 4.5 BAR

peace
Hog

[Hog]

I think your last question is referencing the Roadrunner Emulator that the guys are using n the 512 -411 PCM. Craig Moates did make a Roadrunner work on a Blackbox PCM, but IIRC it was very very temperature sensitive.

The Roadrunner Emulator only allows you to make immediate changes to the calibration without reflashing, but you still need the Tunercats OBD2 or EFILIve software no matter what.

You could rip out your blackbox PCM and your 1990 TBI ECM and use an 0411 PCM to control your whole truck. Theres no reason why you cant use the blackbox to run the whole truck either, its just that fining places to recalibrate it are less common than the 0411 PCM. In other words, the Roadrunner would only save you time lost due to flashing the PCM's, as any changes you make via the TC2/EFILive are introduced into the calibration immediately. It doesn't prevent you from having to buy any tuning software. In fact in order to buy Tunercats OBD2, you must be a Roadrunner owner, or buy the 2 at the same time. I just checked at Moates and the Roadrunner emulator is currently unavailable.
http://www.moates.net/gm-1996present...-c-100_56.html

peace
Hog

[Aksl]

Ok, so I guess I got you all confused a bit.
Let me try to make it clear.
I have a standard small block 5.7 EFI basically a TBI.
I installed Vortec heads with standard Vortec manifold and standard spider injectors. Throwing away my original ecu, and installed black box computer, with all the original Vortec wiring under the hood, inside cabin I left all original wiring, and joint the two together, the Vortec wiring under the hood and original in cab, it was a pain I the ass, to fined and join all necessary wires. Fuel pump I changed as well, for a more powerful one, don't remember the make, it is used for extra powerful tuned cars, so it has enough power, and standard Vortec CSFI regulator. So that is my setup.

[Aksl]

I will make some pictures and post.

[Hog]

I guess what was confusing me, it that you said your programmer soldered something into it. Are you talking about the black PCM?

peace
PAuly

[Aksl]

Yes, the black box PCM, 1996-1998, mine is 1998. Well, he soldered a socket for the chip, so he can take it off any time and reprogram it.

So now, the chip can be easily taken off, programmed and installed just by clicking it in the socket place..

[Hog]

That's an odd way to recalibrate those PCMs as they are a flash based PCM. Most people simply flash new calibrations through the OBD2 port. I use Tunercats OBD2 and I can recalibrate the 1996-97 and the 1998-2000 blackbox PCM's by plugging into the OBD2 port.

peace
Hog