Bosch K-jetronic - How to: Modify Your Metering Head
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- čas přidán 22. 08. 2024
- #youtube #mk2golf #kjetronic
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Another series for anyone wishing to get the best out of their metering head or if you are just interested
Basic system pressure is 100% key with k-jetronic
Not enough pressure means less fuel gets into the top chamber and out to the injectors which need a constant 3+ bar (3.3 bar)
As we see from the demonstration system pressure dramatically increases fuel output.
Terrific. I feel I have no choice but to gain a near engineer level understanding of K-JET in order to get and keep my US 16V (PL) running its best. These videos are priceless for that. Thanks for another great one
Thanks, i will be doing one soon on pressure tesing the KE-Jetronic as its slightly different than the K-jetronic
Good job sir
Yet another great video, top explanation 👌👍
Thanks, much appreciated
Brilliant video as always. Can’t wait to get mine sorted so I can get it booked in with you!
Look forward to it
Another great vid cheers bud
Thanks
Hay mate, this is spot on for my work probably. I didnt see the shim though put it on off camara. Will you show it in next video?
Yes will show more focus on the shim / shims in the next one, thanks
Fantastic, well explained and demonstrated, thanks
Thanks
amazing info.. this is good stuff
Thanks, will be another part to this in a week or so
interesting, but i woudl have love dto see teh shims and see you putting them in.
Fear not that part of the next video is already filmed
@@GreyGooseRestorations ah fantastic!
I tweaked my system pressure up when I rebuilt my 16v 8 years ago, but I am fitting uprated cams, nothing too hairy, as it’s a street car rather than track, 272 degree. But once it’s finished, I will again check the power and mixture to see if it’s still okay. Already thinking about pulling the metering head apart and fitting new seals as they are probably original...
Some seals i have found have been flexible still but flattened over time that seem fuel past internally
Great vid on system pressure! So if 6.6 bar = 150cc and you tweaked your outlets to give you 195cc off of 5.8 bar, what is it that you did to your outlets to achieve that?
Thanks, just the flow adjustment, ill cover that in the next one 👍
Great video! Would you know what the pressure should be on a 2.6 Mercedes 280E?
System pressure should be 5.2 to 5.8 bar
@@GreyGooseRestorations thanks a lot!
Yet another very informative and educational video about these old K-Jet systems! Thank you!!
Just for curiosity, do you have any knowlegde about the later KE-Jet (KE-Motronic etc.)??
Thanks, and yes, they are a tad more tricker, i do have a video planned for the later KE-Jetronic as its a bit back to front when testing it
@@GreyGooseRestorations These videos I'll be looking forward to! 😎 I've got 2 Audi 80 16V's that I'm struggling with so that would be utterly helpful 😎😎😎
control pressure 3 bar is all the time good when you switch the system pressure ?
Greetings from Hungary
Hey, thanks for posting this stuff. I have a 1983 GTi that I race in an endurance series called 24 Hours of Lemons here in the states. We have modified the intake manifold and have bigger valves as well as a 288 race cam fromTechtonics Tuning cam. I feel like the car should be making more power than it does. We have never had it dyno'd so I don't know officially what we're making. I am going to be checking the system pressure as well as the control pressure soon. As you're only dealing with system pressure with this testing that you were doing, what if anything, has to be done with the WUR for control pressure? If I change a shim in the metering head, is that all I have to do to increase fuel flow out of the injectors? Also, do you have a diagram on how you have your fuel pressure tester hooked up to just get system pressure? Thanks, Jay
Hi, thanks for commenting, love hearing what things mk1/mk2s get up to
Yes just raising system pressure will increase injector output
WUR can be adjusted to improve the response time to fuel flow and over performance as it allows the air plate to raise higher dependent on the air being drawn in.
I did a video ref how to make a kit plus where to do it, check that out see if it answers your question 😉
At out race last weekend, at wide open throttle going down the straight away, the wideband O2 was showing high 13’s to 14.3…I’d love it to be richer. It’s not boosted but it is a race car. with that big cam, we warm it up manually, then it’s basically running for 7 or 8 hours till the days racing is done. Do you have a place to purchase the shims need for the fuel distributor or the actual size? If we get to a dyno and can swap shims in between pulls, we’d be able to dial it in really fast. Thanks for the quick response. -Jay
@jaysilver4670 13 to 14 AFR is pretty much where you want it to be as thats lean best torque area generally.
Hi, I'm a little confused i did this test in real time, i mean on car, put injectors in clear cup ,ign. on for 30 sec and i get even 100 ml of fuel with 5.6 bar ,if i double that its 200 ml for 1 min
that is to much of fuel ,you have video when u test injectors on car and have 110ml for 40 sec,and on 4 injector u have 100 ml.
Thanks
Thats way to much fuel, i can only guess that your metering head isn't correctly adjusted for the car as mentioned 120cc/min is stock 16v by the book
It is cast iron,last 20 + years on same car, 16v kr .how can i adjust it to give that 120cc. I have brand new injectors ,wur pressure 3 bar, abf camshaft and with all that i running lean top end, like a white top end of spark plug.if i have so much fueling how i dont make power ,or spark plug to be black
Thank you for your time
You are k jet guru and now you have us with k jet problems👍👍👍👍 @@GreyGooseRestorations
Hmm interesting do you have a AFR guage to see what the fueling is doing?
You adjust the outputs on the metering head, my next video will explain this in more depth
Are you 100% it was 100ml in 30 sec
Unfortunately i dont have afr yet,i know its sound crazy but after 30 sec is 100 ml with 5.6 bar S.P. like a gremlins in car )
i can not wait next one ,thanks :)
@@GreyGooseRestorations
What exactly is that pink fluid you run your tests on?
Its a 80/20 mix of jizzer cleaner and a corrosion inhibitor
I’m french so sorry for my english but a have put a kjet on my 2.3 kejetronic and i want to prepar it for 180hp+ with cames and mores… do you think the kjet is enought ?
Hi, yes the cast iron units will flow enough fuel to support 200+ bhp
The next video will show how to achieve this
@@GreyGooseRestorations so nice i Hope my 5zyl get more 180 !
where do you get the shims
Best place would be missingparts.de
cheers@@GreyGooseRestorations
To test full throttle injector flow in my CIS K-Jet Lambda, with the fuel pump running, is full throttle when the air flow sensor plate at max opening? In other words, if I pull the sensor plate up as far as it will go, is that full throttle?
Yes that would simulate a full throttle situation
And, if I raise the system pressure to 80psi using a shim or two, will my control pressure also increase? If so, would I then need to modify my warm up regulator to allow control pressure adjustments? Would 55psi be my control pressure target regardless of the system pressure? @@GreyGooseRestorations
If the system pressure is raised, the control pressure will still be the same. 3.4 bar is a ball park control pressure that works on 99% of cars and gives the desired result.
Thanks. Do you have a video on balancing the flows to each injector? Again, CIS K-Jet, on an 88 Cabriolet. @@GreyGooseRestorations
@seanporter6795 yes theres one called pressure testing or injector testing
Can you point me in the right direction to find fittings fir the m12x1.5 injector? Id like to make custom flexible lines for my car so i can do a custom intake manifold. The distributor end is easy 10mm banjo. Cant find a good way to get to the
60°(?) Flare.
Unfortunately they are mega hard to sorce, the closest i found was some fittings from a hydraulic hose company but they would still require further machining to fit and seal
@@GreyGooseRestorations yeah. I was at the hydraulic shop with thier guru. Found options but they're going to be like hundreds of dollars to get 3 or 4 fittings for each line. I think I'm going to machine my own so I can use banjo on both ends. Since they're m12x1.5 I'll use a open end lug nut with a lug bolt machined with the proper seal shape on the tip. Bore a hole for fuel flow and face, bore and tap the lug bolt head m10x1 for a banjo bolt. It's that or use the stock injector ends and a section of tube with a flare in the end and get a proper size crush collar to fit it to the hose. I found a hydraulic swaging tool for $115 and that does from tiny to like 1.75" so very nice to have.
Best way to be honest, do it yourself then once its all done and someone says where did you get those...you can then say 'I made them' 😉
Very cool. Im putting a 560sl ke-jet engine in my 450slc amd using the 450slc cast iron k jet system. It runs great with the 4.5 and im hoping it will be happy with the 5.6ltr. I'm installing a wideband for safety. Hopefully i dont need to tune it but im sure you videos will help if not. I have a friend in slovakia that knows the system very well too. I understand but honestly my car has been so great ive never hadcto mess with it. I have a bunch of other Mercedes that dint run so well and i hope to get them straight too. Have you ever messed with Mercedes v8 stuff?
Awesome, theres not so many V8 Mercedes-Benz around that need work as they seem not to go wrong which is a good thing for the owner, definitely wouldn't say no to working on one
@@GreyGooseRestorations they go to shit when they sit for too long it seems. Or maybe they were sitting because they went to shit. I've rescued and revived a couple but I've had no luck with a few and never gotten to deep into them since they were in rough cars. My race/drift car gets all my time and I street drive diesels mostly. I've had zero fuel system issues in 6 years drifting auto cross and street driving the 450slc. Do you think the properly working system will have any issues with being put on a bigger engine? The same parts were used on the 6.9 liter cars also in the late 70s so I assume it will work ok but I've never modified it.
@jasonbirch1182 ah cool, yes the system will work, it may need the outputs adjusting for touch more fuel *potentially*
@@GreyGooseRestorations I'll be watching to see how you do it. 👍