MK2 16V 1.8 and 2.0 difference

[...joe]

yeah you can use digifant wiring using a bahn brenner or similar fuel rail and a few other tweaks. i personally don't know much about it but i know its possible.

[rubjonny]

the k-jet system is generally excellent, I wouldnt convert to digifant from it thats for sure!  I'm actually considering converting my digifant 2.0 8v to k-jet, cos I'm sick of the bloody thing not running right

The main reason for converting a 16v to digifant is for boost applications.

[JWS Mk3]

ABF engine from a Mk3 fits straight into the Mk2 no probs. Strip everything from the MK3 engine and use head and block only and fit with all KR ancilliarys. ABF has different cams than the 9a so dont need to swap cams. ABF is 150bhp in Mk3 so should be a little more using K-Jet. Did it to mine and it feels alot quicker.

[WolfieMk2]

Thanls for the fuel rail tip  Now it seems that I need to decide between a 9A or ABF into the MK2??..... And the Kject vs hybred electroinc on the fuel system?? I started out looking for a good 9A with the KR intake cam and electronic injection conversion but you're saying that the ABF is good for 150bhp as well? Does one of the two engines have any distinct advantages? Also, I am familiar with the Kject from days gone by and yes it was a great system, but does converting and 8 valve Digi fitted vehicle back to Kject require any fuel tank or fuel pick up mods at the rear of the vehicle? If I have to start importing fuel tanks I think I'd rather work with plumbing and wiring on a hybred electronic system on a 9A or ABF.   

[rubjonny]

The way you go depends on several factors, you want to pick the way that is easiest for you.

If your car is a Digifant GTI, you can fit the ABF as is with the oem managment using the digifant pump & lines no bother.  If you want to run k-jet, you'll need to fit the k-jet pump & lines.  If your car is k-jet but you want to run the oem ABF managment, you need to take the 2 fuel lines to/from the metering head, and chop out the threaded connections where they screw into the fuel lines.  This gives you a handy-dandy screw fitting -> push fit fuel line adaptor, the lines from the ABF rail will fit onto these and you can clamp into place easy peasy. (use proper fuel line clips, jubilees are a bad idea)

If your car is CE2 the wiring loom will plug straight in, if not you need to convert to digi 2 or splice the wiring loom together.  If you're worried about the wiring side, k-jet is the better way to go as its very simple.  Also, the loom & ecu if not included with the engine is expensive to buy, plus post-96 models have an immobilisor which will give you problems unless you get the key that goes with the car.

If your car is a k-jet 16v, swap the basic engine block & head in and swap all the bolt on bits from the old engine, very easy.  If its a k-jet 8v, the fuel pump & lines are identical to 16v items, but obviously the managment side is unsuitable for the ABF.  The managemnt you choose to install will depend on if you find wiring easy or not

9a its a little more simple, run it on the KR K-Jet management, and fit the KR inlet cam
Advantage with 9a block is it same height as the KR block, so all MK2 16v 4 branches will fit perfectly, where with ABFs some have clearance issues.  A standard MK2 16v  downpipe & manifold will fit the ABF perfectly however, and usually perform just as well as most off the shelf 4 branch items.

Edit: Forgot to add, if you go with ABF managment you need to fit a lambda probe to the exhaust system somewhere. The Corrado 9a downpipe should fit and has a lambda bung, you'll just need a cat bypass pipe to mate it to the std 16v zaust system.  Or you could get your stock downpipe and get a garage to drill a hole & weld a nut on for you.

[WolfieMk2]

Thanks again for the feedback. Looks like I've tracked down a 9A Kjet from a 92 Passat for the conversion. I've heard the Passats may have used a later version of the Kject (ke?) that wasn't as good as the earlier types Any thoughts on that anyone?..... My current dead motor is an 8valve digi system so looks like I'll either be using the Kject if the Passat system was any good, or converting to an after market electronic injection of sorts. Has anyone converted from digi to Kject? is it a straight forward fit into the engine bay if the car was originally a digi O.E. fitment, i.e mounting points etc?

[rubjonny]

The 9a engines have a slightly more modern version of k-jet, using a knocks sensor & lambda probe.  The inlet cam is also milder to stop the k-jet system killing the cam!  Fit a MK2 KR inlet cam and run it using KR management, you'll get more power and it'll be much easier to plumb it all in!  plus you wont need to worry about putting in a lambda probe.  Though if you plan to go aftermarket managemnt in the future, fitting a lambda bung in the exhaust now would be a good idea!  The Corrado 9a downpipe should fit and has a lambda bung, you'll just need a cat bypass pipe to mate it to the std 16v zaust system.