Ed

Can you send me the pin outs for the chips? I can do a PC board with

Tango

in

an hour or so and get some made. How is it working lately?

BTW What is the status of your airplane? You have got to get it tuned

up

so you can enter the  NC to Oshkosh race and win the Everett Hatch
memorial prize. Over $400. Do you think it can average over 200 MPH?

Paul Lamar

Paul,
    Hopefully the pin out numbers can be read from this schematic, let

me

know if not and I will fax you a copy.  From the limited time I had the
air/fuel mixture on the running engine, it appeared to work fine.  If
anything it may be a little on the sensitive side but I did not get a

chance

to really nail things down for the reason stated below.  I wanted to see

how

much my mixture meter really could vary the air/fuel ratio but did not

make

it that far.

    Well, if I were the superstitious type I would think the aviation

gods

did not want me in the air.  While I was last out checking out the air

fuel

meter, all of a sudden my laptop and the HALTECH would not talk.  And of
course, it was after I had made some changes to the timing for the fuel
injectors as I played with the response of the air fuel mixture.  In any
case, I either have a wiring problem or my HALTECH went south.  The

primary

injectors are triggered continuously anytime the HALTECH is on (which
injects amazing amounts of fuel into the intake), this is without the

engine

running or an EFI trigger signal.  Since the HALTECH is only suppose to
trigger on a rising or falling edge of a pulse even a wiring short

should

not provide such a trigger without the engine running.

   I am going out this week end to take the HALTECH out and ship to
stateside repair facility in Dallas.  But, this may be a blessing in

that I

have been wanting a good reason to buy Tracy's unit.  Was a pain trying

to

program in the air anyhow.  So does not look like I will be in the air
anytime soon.  Disgruntle but not discouraged or defeated, just delayed.

  Also still waiting on my HP oil seal to come in.

Ed

I guess what I wanted to know was; are the chips a standard 18 pin .3 inch
wide dip?

Is there something going on with that oil seal that I don't know about?

:-)

Just kidding Ed. I think I know what the problem is. I think your oil

level

in the engine is higher than most because of your oil sump design.

I too think you would be better off with Tracy's EFI unit. You might want

to

sell that Haltech to the road racers.

Paul Lamar

Ed Anderson wrote:

Yes, the LM3914 is a standard 18 pin Dip type chip that fits the 0.1 holes
in a printed circuit board.

 You right - my oil level is higher than most due to the sump shape.  I have
the material for a new oil pan that will put all the oil below the block,
just keep having so many diversions that I have not gotten around to putting
it together.

  Regarding the seal, if it were made of rubber, I would say they are
waiting for the rubber trees to grow from seed.  But, since its synthetic
they must be waiting for the oil stock to get here by slow boat.{:>),

 Yes, I have Tracy's EFI hook up schematic that he was kind enough to send
me and it looks like I have an abundance of wiring that can be easily
adapted to it.  My biggest concern has always been the lack of redundancy
and the fact that I have to manually switch the trigger signal from one
ignition module to the other in the event of ones failure.  Of course with
Tracy's all signals derive from the Crank Angle Sensor which should
theoretically not wear out until long past me caring about it. Also
eliminates the need for me to haul the laptop out to the airplane everytime
I want to change anything as well as looking up from programming and finding
myself in a 60 deg bank..

One of these days I am going to get into the air again, just don't ask me
when.

Ed

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