RPM offset for VE Table

[Roger Heflin]

I put 30 lb injectors on my 93 Z, I originally had 22 lb.  The tuner I
used (someone named shalin patel) we only tuned with diacom, I did not
use a dyno, and from that info we got things to idle good, and run
good on the top end.  He had to adjust the idle and part throttle
settings several times to get the idle working right, and had to add
quite a bit of fuel at higher rpms.   Do you have something that gives
numbers like diacom or a standard scanner that cannot log several
seconds of data.  Diacom was what allowed us to be able to tune it,
because it could save about 30 seconds of data, at 7 samples per
second, so we got pretty good wot data runs at all rpms.   My tuner
was asking for a couple of idle runs out of get, a couple of runs in
gear (auto), and a couple of part throttle runs (not in wot mode), and
a couple of 3gear wot runs.  With all of that it took 3-4 revisions to
have it driving well, and running reasonable, if your scanner cannot
keep seconds of data that would make it much harder to tune. 

				Roger

On Thu, 15 Oct 1998, David Piper wrote:

> 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
> >
> >
> >
> 
>