How high can boost go with my new setup?

[Tippy]

Would like to ask if there is a book out there to purchase that would explain the mechanicals of these cars in a very simplistic form? Remember, Turtle had to explain to me what my wastegate pipe was. There may be no hope for me, if not, I can help support our local mechanics. Quattro, speaking of a fuel meter, foreign to me. WUR, warm up regulator? What does it do? Not looking for answers to those specific questions, but if there is a resource for someone like me? Sorry for the hijack. Anyone in the Tulsa area? I grill a killer ribeye, ribs are not bad either.

Just throwing out some thoughts....

Just google turbocharger systems and there's a plethora of websites explaining. Our systems works like the majority of systems out there that you'll read about.

Other part is CIS. There's tons of info right here.

Lastly, buy Wayne's engine overhaul book (own) and Zimmerman's 101 projects (don't own but it's helped many here) and that should cover just about everything.

[Ronnie's.930]

Originally Posted by Tonger

R 930,

I mostly just lurk but wanted to say thanks for the links on CIS - especially the video which helps to demystify some of the underhood boxes. I'm in the process of revising my turbo/IC/header setup and was confused wrt the whole adjustable WUR discussion.

After watching the video, it seems like a truly adjustable wur would be able to set a total of 3 parameters?

1. Vertical position of fulcrum point of bimetallic strip.
2. Relative vertical position of valve/diaphragm at the free end of the bimetallic strip that controls valve position.
3. Vacuum adjustment input.

So can you please explain how the rpm module would interact with this to provide more fuel at high rpm boost? I would assume that moving the boost lower in the rpm range would require retuning the WUR (how would you adjust this)? What would be the best way of accomplishing this short of EFI? After the revision, my car boost threshold should be 1000-1200 rpm lower.

Thanks!

Jim (JFairman) can do a better job of explaining all this than I can, but the RPM module doesn't provide more fuel, but rather, it delays the boost signal from reaching the WUR, until a set RPM of choice, and thus, lessons the overly rich, midrange fuel dump that is a common negative with K-jet. In other words, the RPM switch delays the point at which the WUR boost enriches.

As to your second question, when the boost threshold is lowered, the WUR simply gets the signal sooner, and will then enrich at that point (1000-1200 RPM lower in your example above). How much it enriches is dependent on full enrichment fuel control pressure (the higher pressure = less fuel reaching the mechanical injectors = leaner mixture . . . the control pressure works against the piston in the fuel head). There is a provision for this adjustment built into the Brian Leask modified WUR.

I also want to mention that you really can't make any useful adjustments unless you have an AFR meter installed, as otherwise, it's pretty much just guess work and will be very frustrating.

Oh, and the best way to accomplish adjustments is to get your hands on a Leask adjustable WUR and the instruction booklet that originally came with it. Obviously, that is difficult to do at the moment since he stopped making them, but hopefully Brian (RarlyL8) will get something going in that department (maybe?). You would probably benefit from even just getting a copy of the instruction booklet as it is full of good information that helps make the whole WUR business make sense. I have one, and I suppose I could make you a copy and mail it to you. I don't think that would be considered appropriate if he was still in business, but maybe it is now?

A note about the K-Jet video - the air flow meter described in it is what you would find on a non-turbo 911 (says how arm rises as air is drawn through it) but the one on the turbo is the opposite - the arm/disc lower as air is drawn over it.

[911nut]

Originally Posted by gsxrken

Actually Paul, I missed that post but I have thought the same thing myself, except I thought it might be you! There is a certain over the top-ness throughout his posts that a rare few could creatively pull off... but you're one of them.
Care to come clean?

Hmmm, interesting perspective. Given some of the large egos on this board, I could see someone doing this to have a little fun but it appears that no one's actually biting....

[Skillet83]

Thank you for the links and suggestions Ronnie.

[Robbbyg]

Really sorry but Ive now forgotten what we were discussing ,


Are you all friggin happy now???


I do get frustrated as Nuen mentions and thx to quattro for keeping it cool and others for keeping on track

But for the rest of you im going to meet in a pub one day, spike your drinks when your not looking and post your silly dancing on you tube !

Geez i need a beer!

[Robbbyg]

Originally Posted by Ronnie's.930

And Rob, one other tidbit - if you don't want to hear from very knowledgeable people, then this is definitely not the forum for you. A fart from the likes of JFairman, RarlyL8, SpeedySquirrel, CopBait and several others, contains far more turbocharging and K-Jetronic knowledge than I could ever provide, so definitely don't read their posts.

You got most of that correct,
why dont you go back to the park and feed the pigeons before you spew anymore crud here