RPM offset for VE Table

[David Piper]

Hi Jason

I need your advise on how to handle an application involving a supercharged
'91 GTA.  We have replaced the stock inj with 42 pph Lucas. We have removed
the FMU.  After a week of adaptive learning, it was drivable, but very rich,
leaving black stripes on the pavement from the exhaust.   We are
reprograming the ECU via mailorder, but are having problems with leanout mid
to top end.  We have a scanner and a dynojet.  I am computer literate with
some digital design experience, having had electronics as a hobby since the
age of 13.  Have extra class amateur radio license.  I am trainable and love
learning new things, but dont know where to start.  I know I need a reader,
like a Diacom, since the scanner belongs to someone else.  Irrespective of
long term aspirations to programming myself, we have to solve this GTA
application near term.  You have acquired some experience, what do you
suggest?  I would prefer to discuss on phone if OK.  Please provide your
number and we can make short work of this or you can call me.


Thanks

TurboDave

David Piper, owner
Performance Chassis Dyno
239 Beverly Road
Greenville, SC 29609
dapiper at one.net
864-322-2737

At 11:05 PM 10/14/98 -0400, you wrote:
>the 7747 again so not to confuse anyone
>
>The RPM offset for the VE table (0x37d)  is 10 hex = 16 dec * 12.5  =
>200 RPM.  Well that would lead me to assume that the VE table should
>start at 200 RPM and not 400 as it is shown everywhere in the archives
>and the 101 pages... Does that mean that the RPM offset uses the 25
>conversion factor instead of the 12.5 .. Well if that is true then the
>spark table's offset would be 20 hex = 32 dec * 25 = 800 RPM.... So
>either the VE table starts at 200 rpm or the spark table starts at 800..
>Anyone know which is right, I would tend to believe that the VE table
>starts at 200.... but thats just me...
>
>--
>Jason Weir
>88 Wrangler - 258 Chevy TBI
>Fayetteville, North Carolina
>http://home.att.net/~jweir/tbi/inject.htm  --- TBI Installation Page
>mailto:jweir at att.net
>
>
>