V6 Vortec to V8 Vortec Conversion

[Len Sabatine]

>  Check out obd2.com , B&B Electronics- Auto Tap , etc
   Most GM Flash PCMs can be re flashed with a Tech2,
     providing the PCM you have is the correct Hardware ID.
     Len


>I think I can figure out how to interface the obd-ii interface with my pc...
>but haven't stumbled upon any applications out there that can communicate
>with it.
>
>AL
>
>
>-----Original Message-----
>From: Len Sabatine [mailto:sabatine at epix.net]
>Sent: Thursday, August 16, 2001 10:35 AM
>To: gmecm at diy-efi.org
>Subject: Re: V6 Vortec to V8 Vortec Conversion
>
>
>      While the PC Dyno program may be giving some cool gross HP numbers ,
>      I would be looking at the shape of the torque curve more closely ,
>especially
>      with an OBD2 PCM. Overall , a LT1 F-Y Body production cam w 1.6 rockers
>      will drive better and be easier to get up and running.
>      A '96 Vortec PCM is not identical to a 98  Vortec PCM , just close.
>       Len
>
> >Hello All...
> >
> >My name is Al Janetsky.  I'm a Systems Engineer with a telecommunications
> >organization... and for fun I'm converting a 1996 GMC Sonoma sportside
> >equiped with the 4.3L Central Sequential Fuel Injected Vortec to a 5.7L V8
> >Vortec. I'm hoping to keep the truck streetable with occasional runs on
> >Saturday nights at the local drag strip (for fun).
> >
> >The donor motor, wiring harness, and PCM is out of a 1998 3/4 ton GMC
> >Sierra.
> >
> >I currently have the engine at Kendricks of San Antonio for my machine
>work.
> >
> >Modifications include porting and resurfacing the Vortech heads.  An LT4
>Hot
> >cam package... 1.6 roller rockers, and upgraded valve springs.  The specs
>on
> >the cam are 218/228 at .525/.525
> >
> >I plan to swap out the v6 pcm for the v8 pcm... (even though they are
> >identical except for the programming).  I plan to use the existing v6
>wiring
> >harness and run a few of the pinouts from the pcm to the fuel injector
> >assembly. I've already traced the pinouts from the ecm to the injectors,
>and
> >think that it will be a fairly straight forward swap.
> >
> >There are a couple of major concerns that I have regarding my project.
> >First off -  Does anyone think this cam is too large for my conversion.
>The
> >vehicle should weigh in at about 3275 after the v8 is installed.  Gearing
>on
> >the vehicle is a 3.08 locker, and the transmission is a 5 sp New Venture
> >3500 that I just rebuilt.  I know that I can give up some low end torque...
> >and it looks like this cam will make gobs (in comparison to existing) of
> >power way up in the rpm range.
> >
> >A computer program at the machine shop speced out about 330HP with the use
> >of small tube headers and somewhere near the 400 ft/lbs of torque mark.
>I'm
> >concerned that the PCM will not be able to handle all of the duration.
> >
> >Some other areas that I would like to address are the identification of the
> >98 OBD-II PCM and how I might be able to custom program the system to be
> >more compatible with the modifications... (including tach, gearing, manaul
> >trans, etc. etc.)
> >
> >I'm willing to spend time doing the research... but so far it appears that
> >most of the information on the web is related to older efi systems.  I've
> >considered the hypertech solution... but to me, it's only a duct tape
> >solution being that I can't fine tune the system to my needs.
> >
> >I'd really appreciate any information about the 98 pcm, communication
> >protocols, etc that would get me started in the proper direction.
> >
> >Thankyou,
> >
> >Albert Janetsky
> >aj5242 at txmail.sbc.com
> >---------------------------------------------------------------------------
>-
> >To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> >in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>
>----------------------------------------------------------------------------
>To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
>in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>----------------------------------------------------------------------------
>To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
>in the body of a message (not the subject) to majordomo at lists.diy-efi.org

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org