Bosch K-jetronic CIS - WUR Mod - How-to + Why
Вставка
- Опубліковано 22 тра 2022
- #bosch #niche #youtube
This is the next instalment of the K-jet videos. The WUR mod or warm up regulator modification.
In this video I show you exactly how to carry out this modification and explain the reasons behind it by using my model K-jet unit along with a demonstration on a running vehicle showing what happens to the control pressure when adjustments are made which then confirms what has been discussed.
Standard control pressure with a working WUR (UK Models)
- Cold Start Pressure 1.7 - 2.1 Bar (24 - 30 psi) approximately
- Warm Pressure 3.4 - 3.8 Bar (49 - 55 psi) approximately
I have set my control pressure to 3 Bar which as noted in the video provides an AFR of 13 at 6700rpm which works for my 1.9ltr 16v engine.
But as a rule of thumb lowering the control pressure to 35 - 40 psi will have the desired effect in performance gain.
shareasale.com/r.cfm?b=510988...
Use code GREYGOOSE22 for 22% off site wide
Join this channel to get access to perks:
/ @greygooserestorations
![Lp. Последняя Реальность #107 РОДНОЙ ДОМ [Финал] • Майнкрафт](http://i.ytimg.com/vi/IK3QKzKUlHM/mqdefault.jpg)
Superb video, beautifully explained.
What a perfect explanation of the inner workings of the WUR! 👍
Excellent job. Well done. Thanks for sharing.
Excellent video. Thank you!
Thank you for the extremely helpful explanation. Im a visual learner and this really helps me understand the system. Dealing with my first CIS system (83 240 GLT) and excited to dig into it!
Great video again…the unusual use of “orifice” again 👏🏻
Brilliant!
Wow! Amazing explanation...
K-Jet For Life! 🥰
What a great vídeo 👍👍👍
Good 👍 stuff
Good video and some clear explanations. I have a question though. You have a double diaphragm WUR. That means the vacuum take off changes the pressure on the pin. The bit that moves under vacuum only affects the inner spring seat, and that is the bit that you are adjusting with the allen key. Effectively it is fuel enrichment at WOT (when vacuum is lowest). My thoughts are that the allen key adjustment is to control the effect the vacuum has on the control pressure, allowing you to tune for WOT. When you look at how a WUR is supposed to be set-up for cold/warm pressure, it focusses on moving the bimetallic strip or the fuel cell in and out of the WUR. I'm convinced that the allen key is there for adjusting control pressure in line with vacuum. A normal WUR (with no vacuum) only has one spring, so I'm convinced there is logic in may argument but I've been unable to find any discussion on it. Do you have a view on that?
K-jet + Turbo owner here. Major thing that you didn't tell people is that there's a possibility that the airflow meter plate will move up too easily if the control pressure (one that is regulated by WUR) is too low. Meaning, you can enrich your fuel mix at lower RPM, but when you will go WOT at above 4000 RPM the airflow meter plate will top up and fuel mix will become VERY lean. Resulting in engine damage even. So, the best is to measure AFR to see if the engine has started to lean out at high RPM after you've decreased your control pressure.
great video I have a spare WUR I will do this mod with
Very happy for another Golden Kjet Video.
Hi mate Iv had a problem with my jetta and still do when cold it start lovely when hot and turning it off for 15 minutes and back on still fine .. but leave it for hour or so it start like lack of fuel like it evaporated
i have an audi 2.3 with a KE3, ive heard that you can get more out of it by adjusting fuel pressures since theyre set for emissions out the factory. but the KE3 has a EHA valve instead of a WUR so i was wondering if youre capable to show something like that too
Where about do you get your rebuild seal kit?
I made a rookie mistake and made both the adjustment you describe and the adjustable pin method. Is there a base setting on your modification that I should target on my WUR?
Great video, thanks for the explanation but this is for warm pressure regulation. How do you set up the cold pressure? I don't have a good idle on cold and stalls after a few seconds from start. Probably the cold pressure is wrong. Starts easily on cold and warm and runs good on warm. On warm I have 3,5bar from 30degree celsius and on.