[Gmecm] 181 merc 730 mixture trim adjusting tool

[Avery Nisbet]

For the O2 sensor a lot of people like the LC1 from inovate motor sport.
There are gauges available for them.  The code$59 stuff can use it as an
input to tune cruze.

Just keep your laptop in the car/truck until you start getting really
really confident in your tune.   You don't want to muck with the signals the
ECM is getting.   You will probably not find any great advantage between
batch and Sequential injection.  Most Sequential systems go into batch fire
mode at high load.  I think the GM systems did it somewhere around 3krpm.
 This is mostly due to injector flow rate and the amount of time needed to
put the fuel in the intake.

The priming is not really needed.  There is a table to edit for cold start.
 Tuning that during a couple of really cold mornings should get you going
just fine.  If you are really worried about it you could put a switch on
the Ignition relay to turn off power to the coil and then crank without
start.  Then turn the switch back on and start the engine.

-Avery

On Thu, Aug 18, 2011 at 1:11 PM, alan mays <truckeez at yahoo.com> wrote:

> Ok again thanks for everyones patience.  was reading the 18 yr old  fuel
> injection /Jeff Hartman book again,  I tried to find contact info on the
> net-came across magazine articles he did and got more questions,
>
>   1.   My most intriguing one is-------- about a tuning mixture trim device
> (with one or two lenier potentiometer knobs) to instantly lean or enrich the
> fueling when mapping,
>
> Does moates sell a tool like this-to use with gm computers?   I have heard
> of aftermarket efi systems that actually have one the enthusiest installs on
> th dash to control things------------ just like early autos up to the late
> forties had a spark adjance lever attached to the steering wheel (when
> drivers were not idiots and actually knew what the engine needed).
>
>  2.  Hartman says that the 91,2 TPI's were just batch fire,  is it simple/
> possible to run it sequential as long as I have a tdc sensor and a cam
> sensor?
>
> 3.  Some enthusiests have rigged what amounts to a "spark  trigger" causing
> the ecu to trigger injections before cranking--providing a primer dose of
> fuel--like pumping the throttle on a carbed car before starting. is this
> do-able with the gm 730
>
>   the hard parts are easier for me to grasp--and  installing sensors too,
> 4. Oxygen sensors----  we must be light years ahead of what this book
> knew ,  whats a good affordable wideband tuning oxygen sensor  for
> tuning--one that also uses a dash guage?
>
> 5. There were add on knock sensors avalable in 93 when this book was
> written- would one of those cancell out that part of the prom on a 730?
>
>                                                            Again thanks for
> the input,  Alan
>
>
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