Re: Off idle transistions

["Dominic Sorresso" <surrexi2@home.com>]

Bruce,

I understand what you mean. Under acceleration, it is not dramatic but
rather it seems to gather speed at a rapid pace, especially once you hit
3000rpm, and easily revs past 5000rpm. I am beginning to think that the chip
I have may be close enough to not warrant modification. I bumped FP to 10.5
from  just under 10 and that seemed to smooth out the idle nicely.  I am in
the process of re-reading your tuning tips and also Programming 101. Could I
impose on you to clarify some points you make in the piece? Please let me
know if you would prefer on or off list? As I read it, I am particularly
interested in the light cruise tuning since this is where the vehicle lives
most of the time and where I think it could get better gas mileage
(currently about 20mpg at 75mph with 3.07 gears and OD). Also, cold start
seems to be richer than necessary until it goes into CL.

Dominic
----- Original Message -----
From: "Bruce Plecan" <nacelp@bright.net>
To: <gmecm@diy-efi.org>
Sent: Monday, August 14, 2000 9:19 PM
Subject: Off idle transistions


> Then your close.
> When right, the car will seem almost slow, but will be fast.  That's why
an
> in car timer, is needed.  Even in my ol X-Fire, while kinda quick, what
make
> it fast was it absolute tractability.  After 2 passes (at the drag strip),
I
> could modulate the gas pedal to maintain my "perfect 60' time".
> Grumpy
>
>
> > Bruce,
> > I remember a recent post of yours saying that a good judge of the chip
> > calibration is whether it will pull away at 1400-1600 RPM in direct
> without
> > lugging. I tried that with mine today and except for a very slight
> > hesitation it motorvated away with no problem.
> >
> > Dominic
> > ----- Original Message -----
> > From: "Bruce Plecan" <nacelp@bright.net>
> > To: <gmecm@diy-efi.org>
> > Sent: Monday, August 14, 2000 8:19 PM
> > Subject: Re: TPS boosters?
> >
> >
> > > "our cars" happens to mean the Buick EFI turbos.  On some cars get the
> > > travel right from idlev to max seems to be a problem, from what I've
> > heard.
> > >   They are time to time offered by others for other ecms.   Dunno for
> sure
> > > if there are other applications where they are actually needed.  I
> haven't
> > > ever had a problem with the ecm seeing 100%, which as mentioned can be
> > other
> > > then 4.8x v
> > >   All I ever do is set the idle v to what the manual says, and test
for
> a
> > > resonablely high v, and that when the pedal is fully depressed the
> > throttle
> > > physically opens all the way.   You'd never beleive the number of
loyal
> > > customers I used to have from cutting out the sound deadening from
under
> > the
> > > gas pedal so the cars ran right at WOT
> > > Grumpy
> > >
> > > > Saw this mentioned on one of my other lists, anyone got an opinion?
> > > > Hey,anyone ever tear one of these apart? Seems to me it couldn't
make
> > any
> > > > difference at all, because WOT mode in most ECM's is 70-75%, isn't
it?
> > > > Putting out even 5 v into the ECM from the TPS wouldn't help, would
> it?
> > > > Seems this is an even better way to waste $100 then lighting the
bill
> on
> > > > fire...
> > > > Tom
> > > > >Casper Electronics Throttle response calibrator is available for
our
> > > cars.
> > > > It recalibrates the TPS above
> > > > >70% throttle. It seems to be a good deal at only 89.95 and from
what
> I
> > > > gather it seems to increase the >voltage
> > > >
> > >
> >
>
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