Date: Wed, 30 Jun 2004 07:38:30 -0400
Reply-To: vw4x4@FYI.NET
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Eric Zeno <vw4x4@FYI.NET>
Subject: Re: audi 3A Swap -- Jetronic LH 2.4 question
In-Reply-To: <vanagon%2004063005074286@GERRY.VANAGON.COM>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Let me make sure I understand this. Yuo are putting an Saab fuel system
on an Audi/ VW inline 4 cly. Is this correct?
Eric
Sam Payne wrote:
>I'm in the delirious beginnings of putting an audi 80 2.0 engine in my
>86 vanagon and running it off of a Bosch Jetronic LH 2.4 FI--a result of
>poaching Frank Grunthaner's painstaking research in his pursuit of the
>Turbo Audiagon.
> I got the Saab Bentley and Probst's excellent book 'Bosch Fuel
>injection & Engine Management' and read for awhile. Turns out the post '86
>non-turbo Saabs use a non-advancing distributor just like the audi 80, so
>I'll be spared Frank' distributor mods. I decided to try for an '88 Saab
>donor because it ran LH 2.4 (which is a bit more refined than 2.2 in that
>it has does away with the throttle dashpot and has adaptive idle and
>mixture control and on-board diagnostics) and because it had the hall
>sensor in the distributor. The Saab '89 and '90 models mount the sensor
>beneath the crank pulley. The Audi 80 has the hall sensor in the
>distributor.
> Armed with this knowledge I set forth into the wilderness of 5 local
>Pick 'n Pull yards and a couple of independant ones--sheer undiluted
>pleasure--and found several strange phenomena. First, every year but the
>one you want is there. Second, there are a bunch of guys who go from car
>to car stripping only the relays out. There was at least one in every yard
>I visited, they got to every Saab I saw first. (What do they do with all
>those relays?) Third, most of the air-mass meters were gone, especially
>the plastic-bodied post '87 ones, which aren't interchangeable with the
>earlier ones. This last I expected.
> So in the heat of the mid-day California sun I broke down and stripped
>the only complete (minus relays) contender I could find: an '89. The
>wiring diagrams in Bentley show three wires coming from the Hall sensor in
>both the distributor-mounted version and the crank pulley mounted version.
>They attach to the same terminals in the ignition control unit, BUT the
>crank pulley mounted version uses thicker wires: .75 instead of .5. I
>guess that the point of the crank-pulley mounting is to improve sensor
>accuracy, so (now that I'm out of the sun) it seems likely that the Bosch
>engineers also reprogrammed the Ignition Control unit and the FI control
>unit to take advantage of that. If they did, will it work well with my
>audi 3A's distributor-mounted hall sensor????? I looked into pulling the
>pulley mounted sensor out of the '89 Saab, but the crank pulley is right
>up against the firewall (backwards-mounted engine!) and I think I'd have
>to pull the engine first.
>
>
> Advice? Absinthe?
>Congratulations to Alastair, thanks to Frank for an interesting project.
>
>
>
>
| 
