[Diy_efi] Holley projection questions

Lee M. Lemoine llemoine
Fri Mar 10 16:39:03 UTC 2006

btw:  as far as the enrichment thing..  you should be able to dial back the
fuel til your astoch on your meter at idle, and adjust your accelerator pump
to prevent that bogging in the throttle movement area.  Not sure how it
adjusts on your particular setup...   Just a quick thought.

On 3/10/06, Lee M. Lemoine <llemoine at gmail.com> wrote:
> Welcome to the list...
> I had issues similar to this with my Haltech -- there were two sets of
> 'grounds'..  some were 'sensor grounds' (floating 'grounds') and the other
> type was a chassis ground.  I got those confused at first and got some funky
> readings, as the grounding strap between the engine and the chassis had some
> corrosion...    This caused intermittent leaning out / stalling conditions,
> the ECM would reset as soon as it the ground.  I had to repin all the
> connectors on the factory ECU)  so....  sure enough, i figured out it was
> the ground after really looking closer at all the black wires in the
> harness... and the diagram a little more :P
> As far as this wiring harness goes... Can you e-mail me a copy of the
> PDF?   I'll take a look at that wiring and see what i think.  If i don't see
> anything glaringly obvious, i'll post it on my website and post a reply with
> the link so that i can share this with the others..
> I've never seen the Pro-jection
> On 3/10/06, Simon Juncal < sjuncal at erols.com> wrote:
> >
> > Hello new to the list here. I found some of this lists posts googling my
> > pro-jection problems and thought maybe I could find some help and
> > opinions.
> >
> > I got the digital 1d system used for next to nothing, open loop for now,
> >
> > So I've got a bunch of ideas and questions... like has anyone hacked the
> > ECU so that the fuel maps can be programmed via laptop?
> >
> > I notice the closed loop "system" they sell for 200 dollars is just an
> > o2 sensor, 3 wire harness and a proprietary connector... has anyone
> > patched in their own o2 sensor? Does anyone know which post in the input
> > connector accepts signal from the sensor?
> >
> > I've asked holley tech sup a few basic questions and gotten canned
> > replys and multiple copies of the instructions sent to me in PDF :)
> >
> > The PO of the system had it on a Sazuki Samurai, on which it ran super
> > rich... it's now on my Jeep 4.2, (with 4.0 head conversion, original
> > intake and 4.0 header) which is the target aplication of the 1d system.
> > The PO along with the help of someone at Holley had the TPS wiring
> > turned around and spliced in the harness ground, the voltage range is
> > 3.7 to 4.7 nowhere near the 0.63 holley's instructions recomend. I can't
> > explain why, because as near as I can determine this range ENRICHES the
> > overall fuel mix (making it harder to lean out via the ECU knobs) and
> > makes the fuel curve more drastic.
> >
> > That said this TPS setting get's me a running, smoothly idling (for a
> > jeep) engine but it runs constantly rich, doesn't start easy, gets 10
> > MPG (16 to 18 is normal)... SLOWLY leaning it out in the tuning process
> > gets me JUST to the Stoich on my autometer gauge, better MPG, hessitant
> > acceleration, and inconsistant dropout's where it leans totally out if I
> > _barely_ touch the throttle, but riches back up when I get further into
> > the pedal. Crusing with foot resting on pedal leads to long off the
> > scale lean conditions, and occasionally it leans out at idle, and will
> > stall if left alone without pedal.
> >
> > Problem is just reversing the wiring back to what the instructions show
> > doesn't get me any fuel, the ground as I said is spliced in or Y'd to
> > the Grey TPS wire both then going to the black harness wire back to the
> > ECU... Seems strange to me but I can't find anywhere else in the harness
> >
> > that the ground wire might actually have been attached to.
> >
> > There's only one black wire at the ECU input connector, the TPS has a
> > black wire, and this ring terminal ground. are they really supposed to
> > be Y's together like that?
> >
> > Sorry for the long assed post, but I've never been too worried about
> > being in over my head. I'm too used to the feeling :)
> > _______________________________________________
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> >
> --
> Sincerely,
> Lee M. Lemoine
> http://www.turbochargedsoul.com/
> '06 Subaru Legacy GT Limited - 250/250 AWD 5EAT
> '93 Chevy Cavalier Z24 Convertible - 300/330 FWD 5MT (Mclaren Turbo!)


Lee M. Lemoine
'06 Subaru Legacy GT Limited - 250/250 AWD 5EAT
'93 Chevy Cavalier Z24 Convertible - 300/330 FWD 5MT (Mclaren Turbo!)

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