Fw: Fw: [Diy_efi] EFI bug

Wed Jan 5 11:16:42 GMT 2005

Thanks Andrew. The factory manual has more data than the 2 non factory 
manuals
I have. I have never seen the interrupter in real life. In fact the heads 
have never been
off. Its on its 2nd speedo, and an Ign coil replaced years ago. Over 300Ks. 
Going for
500.
The timing sequence makes sense now.
----- Original Message ----- 
From: "Andrew Hopton" <ahopton at optusnet.com.au>
To: "'A list for Do-It-Yourself EFI'" <diy_efi at diy-efi.org>
Sent: Wednesday, January 05, 2005 9:32 PM
Subject: RE: Fw: [Diy_efi] EFI bug

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
you will see that they are not in the same place ...ie 120 apart.  this is
how
the dif module knows which cyl or in a v6 which pair of cylinders (being
waste
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
> EFI. Please correct me if I am incorrect with the following
> suggestions. The V6 GM EFI used on Australian Commodores is US
> 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
> the back of the harmonic balancer. One interrupter has 18 slots, the
> other has 3. 2 Hall sensors are mounted adjacent to each other. It has
> direct fire ignition, using 3 double sided coils.
>
> 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,
> is how the EFI controller knows which stroke a given cylinder is on.
> There has to be a mechanism to determine which coil gets the spark.
> The post 96 models have a cam position pickup, and uses sequential
> firing of the injectors. The earlier unit used a MAP sensor, the later
> a hot wire airflow sensor.
>
> You could use oil temp in lieu of the usual coolant temp sensor. Your
> idea of the V6 throttle body on a VeeDub. It wont be undersized! You
> could probably set up the idle valve as a cruise control.
>
> As for the Ford IL6. Our Ford sixes of the early 90s came with MPI.
> This was a 4 litre with alloy head, OHC. I don't know if its the same
> as US 6s. But the injection system was good. I too have been thinking
> of IL6 with EFI. Rather than turbo, I like the idea
> of 6 TBs with ram tubes.
>
> Cheers for now
>
> ----- 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
>
>
> > Hello:
> > I am a new member to this list, and have been lurking for a short
> > time now. I am interested in two DIY-EFI projects, and am looking
> > 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
> > GM LT1 harness over to the 94-95 8051 controller in my buddies
> > 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
> > little over a novice. I am a Mechanical Engineer struggling to get
> > 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
> > 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,
> > but not too much on the older speed-density controllers. I have been
> > doing some research, and is seems the "730" controller is what
> > everybody refers to. Other research indicates that the early 90's
> > V6's used this same basic controller? Finally, it also seems that
> > the software has a constant for # of cylinders. I plan on using GM
> > 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
> > MAP sensor. Since I understand GM EFI better, I'd like to use a GM
> > controller if possible. I have considered the Megasquirt, but I
> > trust OEM-spec controllers over aftermarket stuff. Call me crazy if
> > you will.
> >
> > The questions I have are:
> > 1) Ignition. Can I run a coil pack setup, or do I modify a VW
> > distributor to work?
> > 2) What other sensors do I need to run a distributorless ignition?
> > Is it just a crank sensor,  a cam sensor or both? Just trying to
> > figure out how the controller determines which bank of
> > 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
> > me, it's getting the basics working on the EFI-side. I'd like to
> > figure out how to setup the firing order, and what needs to be done
> > 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
> > me know. In the long run, I would like to also do a turbo EFI Ford
> > L6.
> >
> > Thanks folks..
> >
> > =====
> > 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
> >
> >
> > _______________________________________________
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> > http://lists.diy-efi.org/mailman/listinfo/diy_efi
> >
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