[Diy_efi] Audi EFI conversion?

[Torbjörn Forsman]

The K-jetronic systems of Audi normally work very well and reliably.
In case of more recent ones, labeled KE-jetronic, there is an ECU that 
controls the fuel flow via an electromagnetic valve (usually called EHA, 
electrohydraulic actuator) in the fuel distributor. This ECU may be 
either an analog one (similar to the Bosch LE and LU-jetronic systems, 
built with a bunch of quad op amps and possibly a hybrid circuit for the 
lambda integrator) or a microprocessor based one, with typically an 
Intel 8051 or 80535 CPU. In some cases, the same ECU also controls the 
ignition timing and then the system is labeled KE-motronic.

I think it would be wasted work to replace the K (or KE) system with an 
all-electronic one. It is much more fun to learn tweaking the K-jetronic 
system for one's own needs!

Similar systems are used on many other european cars from the 80's, for 
example Saab, Volvo, Volkswagen, european Ford, Mercedes, Porsche.

/Torbj?rn Forsman


Bill Shaw wrote:
>>Bill, that was quite a thread on the Ferrari chat re MegaSquirt, did anybody
>>ever try it?  
> 
> 
> I don't know of anyone that tried Megasuirt on a Ferrari.  They seem to be
> at opposite ends of the spectrum,  cheap engine controller and expensive
> exotic cars.  I've seen Motec and other top $ controllers on Ferraris but
> not MS.  Doesn't mean it hasn't happened,  I just haven't seen it.
> 
> 
>>Same problem of long CIS injector reach on the Audi, so you've
>>given me something to look into, for sure.  Nice that the Audi manifolds are
>>threaded for a brass insert into which the CIS injectors are pressed.
> 
> 
> Yes,  same threaded inserts in my recently departed '81 928 and the k-jet
> Ferrari V8s.
> 
> I don't know what the Audi intake looks like,  but I was looking at the 308
> intake runners when I had them off a while ago,  thinking about upgrading
> from k-jet so I could add some boost.  I haven't done a detailed analysis
> yet,  but I was thinking that I might be able to fill the existing injector
> hole and machine a flat and a bung down lower on the runner to accept a
> newer GM style injector,  like on my Z28 LT1.
> 
> Bill
> 
> 
>>Ernie B.
>>
>>
>>----- Original Message -----
>>From: "Bill Shaw" <b.shaw at comcast.net>
>>
>>
>>>Hey Ernie,
>>>
>>>The CIS injectors are quite different from the efi injectors.  There is a
>>>company that makes an adaptor to convert CIS to EFI bitzracing.com,  but
>>>the
>>>efficacy depends on the design of the CIS system.  It is basically a bung
>>>to
>>>replace your CIS bung that is machined to take the efi injector.  Unscrew
>>>the CIS injector retainer,  screw in the adapter,  install the new
>>>injectors, and build up the rest of the fuel system.
>>>
>>>http://www.bitzracing.com/products/injector_bungs/injectorbungsdetails.html
>>>
>>>It looks like it would work well on my Porsche 928 (I've owned both CIS &
>>>EFI 928s) but might not work so well on my Ferrari,  reference the
>>>following
>>>thread on FerrariChat:
>>>
>>>http://www.ferrarichat.com/forum/showthread.php?t=76848
>>>
>>>Once the fuel side is settled,  you need to work out the sparky side of
>>>things.  Megasquirt is one possibility,  but only controls the fuel.
>>>Junkyard EFI is another.  I've had pretty good luck with the '749
>>>controlling both spark & fuel,  others have done well with different GM
>>>ECMs.  If you're EFI'ing the turbo Audi the 749 is worth a close look.
>>>
>>>Bill
>>>'84 928s 5 sp. Vortech/749
>>>http://p-928.home.comcast.net/749.html
>>>
>>>
>>>>From: "Ernest Buckler" <ebuckler at icehouse.net>
>>>>
>>>>Ernie here, long time lurker, owner of EFI motorcycles and a couple of
>>>>Audis
>>>>('86 5000, and '89 200 Turbo 2wd) that I'm thinking really need EFI to
>>>>replace the messy K-Jetronic constant-flow stuff.  I have a small machine
>>>>&
>>>>welding shop, thus can make brackets, drill  & tap ports and holes, etc.
>>>>I'd really like to be able to build a fuel map on a PC, datalog, etc.,
>>>>even
>>>>tho I know v. little about the process - but figure I've gotta start
>>>>somewhere, eh?
>>>>
>>>>Without a Search Engine for group archives, I'm lost; can anyone direct
>>>>me
>>>>to info on converting an Audi CIS system to EFI, if anyone has done this?
>>>>The inspiration for this hypothetical project derives from noticing that
>>>>the
>>>>O-ring kit for Audi CIS injectors also was spec'd for a whole long list
>>>>of
>>>>true EFI vehicles as well - meaning that one of these EFI injectors (to
>>>>be
>>>>selected) should plug right in to the Audi ports...?   I'd need to make a
>>>>fuel rail,  adapt a TPI and some sort of air flow measurement hardware,
>>>>plus
>>>>adapt the Audi temp sensors to the new ECU, also to be selected per
>>>>suggestions.
>>>>
>>>>Thanks in advance,
>>>>Ernie B.
> 
> 
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