VSS- Part 1 solved

[mrvette]

Feeding the 2k pulse nto the 4k pulse input should work fine,  as I have driven
extensively the 730 'puter without the VSS hooked up at all, for about 6
months....then I bought that expensive adapter thingy to hook up....only thing I
noticed was that the idle speed upon sitting at a light settled down to ~700
rpm's and stopped that incessant pulsing up and down....that is the oly reason I
added the VSS....that idle speed variation drove me crazy.....I think the 2k
pulse rate should be enuff to tell the computer that you are stopped
still.....after all the signal is mostly useless otherwise, afterall you cold be
in any gear (stickshift) or have any final drive ratio....so just what the
computer would use with a VSS signal in a running/driving mode I don't know....
seems to be a useless input considering the other more important larger
variables,  load, rpm's.  etc.....just when it's standing still....it needs to
know that to set idle speed......GENE

Mike Hoenes wrote:
> 
> sorry to flog this horse again, but most of the contributors here are about
> two feet over my head regarding electronics.
> anyhow - just so i'm clear on this....
> does this software change mean i can run a DC 2000ppm VSS signal into my 91
> TPI 730, and this will replace the normal AC 4000ppm VSS signal the 730
> expects?
> i dont have an electronic speedo so i dont care about feeds to the
> speedometer.
> 
> thanks for indulging me.
>  ----------
> From: Bruce Plecan
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: VSS-  Part 1 solved
> Date: Tuesday, September 29, 1998 11:52PM
> 
> OK, this just in and verified.  If you are running a 1227730 ecm,
> from a 90-92 TPI that uses prom aujp, and you want to run a 2000ppm speedo
> input do the following,
> 
> Change prom address 0018 from D8  to 98
> Then use C-6 as the speedo input.
> 
> As run on my bench in side beside testing they were +/- 1 mph..
> Speed was set, and the the diacom reset and run on the other
> ecm to compare mph's.  747 to 730.
> Cheers
> Bruce         Grumpy lost a dime on this bet, and has been in a
>                     fit over it (course that's a days wages here).

-- 


                                ____________
Fun under the sun in          //~~~~~~~~~~~~\\
Jacksonville, Fl.  :-)))     //______________\\
                       /~~~---~   |      |   ~---~~~\
                      /|    /______\____/______\    |\
                    (( | /      |          |      \ | ))   
     Mako 'Vettes    | \============================/ |   
 Shift better with   |\ \\[  ]    |mrvette|   [  ]// /|
     Automatics      | \/+========================+\/ |
                     |~==============================~|
                     |_____|                    |_____|
-------------------------------------------------------------------