CIS to Digifant 2 conversion

[timjmcconnell at gmail.com (Timbo)]

Digifant injectors will work in the JH head. Use a 12mm or 10mm allen
(depends on the year) to remove the CIS inserts.  Put the Digifant
inserts in after cleaning the holes out (make sure to remove any
copper sealing rings)  - seal the cups in with some teflon tape to
prevent vacuum leaks around the cups. This blocks off the vacuum
ports.

I suggest going to your FLAPS such as Advance autoparts, and buying a
new set of 8 fuel injector o-rings.  Sometimes they even come with a
conical tool to make that easier.

The brackets for the digifant fuel rail bolt right on to the JH head.
You have to remove the plastic vaccum fitting on one side to bolt the
bracket down.  If you sealed the cups properly - you can just leave
this thing open.

--Timbo

On Nov 25, 2007 2:40 AM, Gordy Stedman <ydrogs@xxxxxxxxx> wrote:
> So after finding a lot the the missing pieces this weekend at the junkyard I
> decided to do a write up on how Sean & I are going to convert my 2.0l
> 3A-1.8l JH CIS with knock engine over to Digifant 2 pulsed injection.  One
> major note is that we installed a VW knock sensor system previously which
> you need to do for this conversion.  I suggest going here
> http://www.driversfound.com/scirocco/ and look under "Tech Tips" and go to
> "Knock Sensor Install".  All the parts for the knock sensor system can be
> found on the vehicle you get all the Digi2 stuff out of.  The knock sensor
> system in stand alone like it is on CIS-E systems so if you install Digi2 on
> a 16V that step is already done.  Also a note that the Digi2 system uses the
> same ignition control module so you will already have that also.  Another
> thing is to make sure your exhaust system has a bung for an O2 sensor if you
> are not using one currently or you will have to weld one in.
>
> Here is a photo of most of the parts
> http://picasaweb.google.com/ydrogs/DIGI2CONVERSION/photo#5136696519914064546.
> We got lucky and found that adapter that goes on the intake side of the Mass
> Air Flow sensor which will allow for the tossing of the A2 air box and go to
> a cone filter air intake.  Our original plan was to adapt everything to the
> JH head and the A1 intake system.  We decided to use the A2 Digi2 intake
> manifold since the air intake system would be better suited on the
> passenger plus there would be more room for the filer and MFA.  This would
> also let us use the original vacuum routing for the Idle Stabilizer Valve
> and the location of the connections on the wire harness to the MFA and the
> Throttle Body would not have to be lengthened.  It would have been possible
> to use the scirocco intake manifold so this step is just for our personal
> choice
>
> We are still not sure if the JH head will work with this system due to the
> air shrouding of the CIS injectors.  The vacuum attachment nipple on the
> back of the head needs to be removed so the fuel rail can be bolted down in
> that spot.  The Digi2 does not use air shrouding on the injectors so
> plugging this hole will be necessary.  We will research this more tomorrow.
> I do have a Digi2 head from the engine I got in NM this summer so I might
> just swap it out, but then I would have to get head bolts, head gasket and
> switch out cams.  Plus I do not know if the head is warped so it might have
> to go to the machine shop.
>
> We purchased the electronic injector seats (PN 037 133 555 A) and new o-ring
> seals (030 198 031).  The temp sensors, fuel injectors and MFA were checked
> for resistance per the Bentley and they were good.  The harness was checked
> for continuity, broken wires fixed and new O2 sensor was installed.  We
> purchased a cheaper universal one but had to make our own connector with
> parts from Radio Shack since we did not have any spare stock connectors.
>
> Got to sleep so I will post more when more happens.
>
> --
> Gordy
> MK1 x 4
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