Fw: [Diy_efi] EFI bug

Wed Jan 5 10:35:52 GMT 2005

I have a VN/VP factory workshop manual that explains this stuff in =
detail.
I could scan a few pages if you think it will help you?

The 3X slots are asymmetric - 1 is 10deg, the next is 20 and other is =
30.
This means that during the first (10 deg) 3X 'window' there is 1 18X
transition, during the second there are 2 18X transitions, and 3 in the
third.  This is how the coils are sequenced.  Note however, that this is
only important during startup - once the engine runs, the coils are just
fired round-robin.

AFAIK, You cannot 'fool' this module to run 4 cyl - it will spend a =
1/3rd of
it's time firing the third coil even if it isn't there, no matter how =
you
clock it.

Cheers,  HTH

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] =
On
Behalf Of Justin Albury
Sent: Wednesday, 5 January 2005 12:32 AM
To: A list for Do-It-Yourself EFI
Subject: Re: Fw: [Diy_efi] EFI bug

if you have a close look at the spacing of th 18x and th 3x on the =
balancer=20
you will see that they are not in the same place ...ie 120 apart.  this =
is
how=20
the dif module knows which cyl or in a v6 which pair of cylinders (being
waste=20
spark and all)
hope this helps

justin

Quoting Geoff Harrison <geoff_h at smartchat.net.au>:

> Hi all, I am also a new member. Still learning the techniques used in=20
> EFI. Please correct me if I am incorrect with the following=20
> suggestions. The V6 GM EFI used on Australian Commodores is US=20
> manufacture. The Ausie V6 is the US Buick 3800 or 231CID. Mine is a 91 =

> model, and stayed the same till 96. It uses 2 interrupters mounted on=20
> the back of the harmonic balancer. One interrupter has 18 slots, the=20
> other has 3. 2 Hall sensors are mounted adjacent to each other. It has =

> direct fire ignition, using 3 double sided coils.
>=20
> This unit should work on a 4 Cyl if interrupters can be made, using 12 =

> and 2 slots, discarding the 3rd coil. What I haven't figured out yet,=20
> is how the EFI controller knows which stroke a given cylinder is on.=20
> There has to be a mechanism to determine which coil gets the spark.=20
> The post 96 models have a cam position pickup, and uses sequential=20
> firing of the injectors. The earlier unit used a MAP sensor, the later =

> a hot wire airflow sensor.
>=20
> You could use oil temp in lieu of the usual coolant temp sensor. Your=20
> idea of the V6 throttle body on a VeeDub. It wont be undersized! You=20
> could probably set up the idle valve as a cruise control.
>=20
> As for the Ford IL6. Our Ford sixes of the early 90s came with MPI.=20
> This was a 4 litre with alloy head, OHC. I don't know if its the same=20
> as US 6s. But the injection system was good. I too have been thinking=20
> of IL6 with EFI. Rather than turbo, I like the idea
> of 6 TBs with ram tubes.
>=20
> Cheers for now
>=20
> ----- Original Message -----
> From: "Michael Kaczmar" <abbynrml94 at yahoo.com>
> To: <diy_efi at diy-efi.org>
> Sent: Tuesday, January 04, 2005 3:26 PM
> Subject: [Diy_efi] EFI bug
>=20
>=20
> > Hello:
> > I am a new member to this list, and have been lurking for a short=20
> > time now. I am interested in two DIY-EFI projects, and am looking=20
> > for a little info. As a brief resume, previous EFI projects include, =

> > Ford EEC-IV Mass Air 5.0L Engine into my 53 F-100, converting a 93=20
> > GM LT1 harness over to the 94-95 8051 controller in my buddies=20
> > Porsche 944, and some LT1 tuning via TunerCat, as well as other late =

> > model GM stuff. So, I do not consider myself a pro, but probably a=20
> > little over a novice. I am a Mechanical Engineer struggling to get=20
> > these circuit boards to tell my engine what to do. I have no problem =

> > with wiring, and have access to a chip burner.
> >
> > My first DIY-EFI project is to setup EFI on an Air cooled VW bug=20
> > motor. I was planning on using a version of the GM-TPI controller. I =

> > have experience with newer and late model GM-EFI systems, and TBI,=20
> > but not too much on the older speed-density controllers. I have been =

> > doing some research, and is seems the "730" controller is what=20
> > everybody refers to. Other research indicates that the early 90's=20
> > V6's used this same basic controller? Finally, it also seems that=20
> > the software has a constant for # of cylinders. I plan on using GM=20
> > sensors, and a GM throttle body. A batch fire system should be fine, =

> > and once I have this running, I will be adding a turbo, and 2/3-bar=20
> > MAP sensor. Since I understand GM EFI better, I'd like to use a GM=20
> > controller if possible. I have considered the Megasquirt, but I=20
> > trust OEM-spec controllers over aftermarket stuff. Call me crazy if=20
> > you will.
> >
> > The questions I have are:
> > 1) Ignition. Can I run a coil pack setup, or do I modify a VW=20
> > distributor to work?
> > 2) What other sensors do I need to run a distributorless ignition?=20
> > Is it just a crank sensor,  a cam sensor or both? Just trying to=20
> > figure out how the controller determines which bank of=20
> > injectors/what cylinders to fire? This is where I am not clear.
> >
> > Plumbing high pressure fuel lines and fab work is not a problem for=20
> > me, it's getting the basics working on the EFI-side. I'd like to=20
> > figure out how to setup the firing order, and what needs to be done=20
> > to make this controller work on a flat-4 engine.
> >
> > I think this is enough typing for now, if I am off the deep end let=20
> > me know. In the long run, I would like to also do a turbo EFI Ford=20
> > L6.
> >
> > Thanks folks..
> >
> > =3D=3D=3D=3D=3D
> > Michael Kaczmar
> > Creator 77/94/95/96 Caprice a.k.a. Frankenstein LT1/MN6 2004 Impulse =

> > Blue GTO, LS1/M12 53 F-100 5.0/T5, Mustang II, T-bird IRS.....
> > 70 F-100 302/C4, Edelbrock, MSD, 1-off bodywork ;-)
> > 65 F-100 289
> > see http://www.geocities.com/abbynrml94 for project pics!!
> >
> >
> >
> > __________________________________
> > Do you Yahoo!?
> > The all-new My Yahoo! - Get yours free!
> > http://my.yahoo.com
> >
> >
> > _______________________________________________
> > diy_efi mailing list
> > diy_efi at diy-efi.org=20
> > http://lists.diy-efi.org/mailman/listinfo/diy_efi
> >=20
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