LS-7/Speartech/Racepak Question

[Ummgawa]

C'mon man I need some help here....and you are married!!!

Ok, so I have gone over to the other side as far as LS motors and am currently shopping for an LS-7. I also wanted to run the Racepak dash with a Speartech harness. For ease of install and the fact that I really like the Racepak set up for its simplicity(relatively speaking of course).John(at Speartech) and I have gone back and forth a time or two and he has a question concerning sending units, data acquisition and the Racepak unit:

from his email:

I would have to know more about the sending units(LS2 & 7) though, as none of these engines use direct gauge sending units from the factory. All of the late model LS2 and LS7 engines take PCM data and send it to the factory gauge cluster thru a serial data line. Are you saying that's how this unit operates?



Here is where I need help-

1. Can I get a heads up on the factory sending units and their operation (or function) and how is this info transmitted to the ECM.(I hope I am asking the right question)

2. Does the Racepak set up recieve its info from a serial data line AND is their a diagram or schematic for the Racepak set up as far as plugs and ports on the rear of the unit. John bascially stated that if he can get the data on the plugs (There are 4 stations on the back of the Racepak) he could incorporate it into the Speartech unit that is a plug and play for the LS-7.

If their is indeed a better way-tell it. The MEFI4 unit has the data to start and run the LS-7, but how about if you run headers and a "Hot Cam". Is that a limitation of the MEFI4 unit vs the Speartech ECM? IE adjustability via programming through soft ware.

I hope I am not coming across as a dummy here, but I am definately more of an old schooler Fortran/Cobal thinker trying to change his ways to this new fangled modern tekknologie. If their is a better way- Please tell me and be as gentle as possible as I have a delicate constitution. I am not calling for a pissing match this vs. that mind you, just strait info based on experience and installation.