K-jet , Twin Carbs or Fuel injection???

**tsovociti** · 04-03-2011, 08:12 PM

Hey guys, i have a 78 2 door project that ive been working on for the past year.
I bought a 1.8 16v Kr motor for it with complete k-jet system. Now the tricky part, i have a set of 40dcoe webbers complete with linkages and manifold. And i have a ****tator management system with 350cc injectors and ABF fuel rail!
Which setup do you reckon i run with? Carb, K-jet or EFI?

**h100vw** · 04-03-2011, 08:34 PM

They still use carbs in formula 1 because they are that good

I'd go with the K-jet personally, as long as you have everything. It can be made to run really well.

350cc will be far too big, standard 8L S3 is 318cc from memory and that's big enough to run nearly 300hp. You'll be lucky to pull much more than half that.

Gavin

**Peter Jones** · 04-03-2011, 09:11 PM

I converted from K-Jet to carbs and the car went faster

**h100vw** · 04-03-2011, 09:19 PM

Don't get me wrong Pete, I like the noise they make and the way they go. I have been in a few MK1 16Vs in my time. One with over 200hp, running carbs.
I have built a magazine featured one, that had K-jet on it. It started and drove like a factory car. Carbs on the street always seemed like hard work. Stuff was always going wrong.
In an everyday situation, for the effort of making it run correctly, injection wouldn't have been the biggest limitation.
Plus the the economy on the 2 that I am thinking of was just dire.
Gavin

**Peter Jones** · 04-03-2011, 09:44 PM

Haha, yeah carbs are only for the committed.

**Preen59** · 04-03-2011, 11:16 PM

Horses for courses, really.

What do you plan on doing with the car? As this will determine which route you want to take..

**tsovociti** · 04-03-2011, 11:46 PM

Thanks for the input guys, i am looking for a bit of power and reliability hence why i replacedthe 1.6 with the Kr.
My only prob with the carb is, ive heard they are a pain to set correctly,now there are no decent mechs in Botswana which is gonna make it difficult for me!
Ive never seen anyone running K-jet on this side of the world as everyone converts to MP9, is it expensive to maintain?

**h100vw** · 05-03-2011, 07:57 AM

Get yourself a book on the subject. Amazon.com: How to Tune and Modify Bosch Fuel Injection (Motorbooks Workshop) (9780879385705): B Watson: Books
K-jet is mechanical and very simple, control pressure regulators sometimes die making the engine hard to start. They run badly until warmed up.
They don't like water getting into the fuel, which was a common snag in the UK with rotten filler necks.
Fuel pumps need to be on good form too.
There's adjustment available in the system for tweaking. Biggest downside really is the ignition as that is fixed by the ECU which isn't chippable. Except for the ECUs on the PL motor. You can use a piggy back/interceptor, I had Racelogic V-SAM on my Corrado which worked great.
Gavin

**Preen59** · 05-03-2011, 01:41 PM

The reason people move away from Kjet is because they don't understand it. It is extremely complicated when you get into the nitty gritty, but if you want to use the standard gear and have the patience to sit down and read up on it, as Gavin has said..

It's relatively easy to tune.