[Crumpler]

I saw a picture of, I assume, Worf’s twin screw at Frenzy.
I’ve never really seen the DR setup it in detail.
Now I would like to know more!

I’m seeing twin throttle bodies.
I’m seeing twin MAF?
Is there some type of shared voltage to ECU?
ICV one side?
IC is flat and between the screw and the head?
The build was before my 928 township, can you share the process and development Worf?
Maybe your observations without giving up the secret sauce?

[worf]

[worf]

More later, when I’m at a real keyboard.

[worf]

I assume you mean this one from TOS:

[Crumpler]

Yes!
I had a buddy send it to me as a pic.
I haven’t been over there yet :)


And, if you can speak on the breather as well.

[worf]

I’m seeing twin throttle bodies.

Yes.

I’m seeing twin MAF?

Yes, and no. The passenger side is a dummy.

Is there some type of shared voltage to ECU?

No. What you see is the Beta Kit. There were two production changes that D.R. was going to do based upon the experience I gained doing the work I did. A signal combiner was one of those changes. As it stands the tune basically "doubles the fuel" for the reading from the single active Mass-Air Sensor. It works fine, but only on a kit-by-kit basis. Slight variations in setup/synchronization of the throttle bodies screw up the idle and low-throttle tune.

The twin setup is best done with MAP (i.e. Shark Tuner Alpha-N) which is now available but this was more-or-less a decade before that was "a thing."

ICV one side?

The ISV is picture-left of the Shell sticker on the plenum drip tray.

IC is flat and between the screw and the head?

Yes. With the exchanger to atmosphere in the nose in front of the condenser.

The build was before my 928 township, can you share the process and development Worf?

My memory is very dim at this point. D.R's work began, at least in thought, the instant JDS released the Shark Tuner mark 1.

IIRC, I saw the first Alpha prototype in 2005.

Prior to that, D.R. originally started with a Keel Kit and, IIRC worked with Andy Keel for a bit.

D.R. had some hard constraints on the fit, finish, etc., of the kit and at some point D.R. parted ways with Andy.

D.R. did all of the hardware. As I recall there were four Alpha kits (all with some variations) with the last installed on Andrew Olsen's '91GT (now owned by Jeannie) in 2007.

Along the way, D.R. got some outside expert consultation that resulted in a meaningful redesign of the air guide, intake and intercooler assembly for the Beta. The result was a bunch of extra torque off-idle.

The Beta kits (maybe four total) also relocated the ProVent. And there were many other small changes.

I came along in 2008 for the first Beta install. Jeannie, D.R., and I installed it the week before SITM 2008. I took hundreds of pictures as D.R. directed me on the install. Long story short, I stayed a week after SITM and a) began writing the installation manual and b) started the process of developing methods and software for tuning a "chip set" with the Shark Tuner mk 1.

I spent the next year refining my custom log-eating software (this was years before Corenman's Shark Plotter) and working on the tune. (It takes a lot of iteration to do proper startup for all temperatures and road tuning is limited 'round here to two runs per sunny day.)

Along the way, I learned a lot about the stock LH/EZK firmware and where certain things got in the way. And also about how much "slop" is in the fit of various engine parts of the 928 from the factory.

This resulted...

... by 2009 when I switched to the Shark Tuner mk 2 and spent another week or so at D.R's for SITM 2009...

Maybe your observations without giving up the secret sauce?

... in the some "secret sauce" which was essentially, a boost switch that triggered at >0 PSI hooked into the LH to keep the O2 loop and adaptation from making the fuel trim "walk away" from the best tune. So, it runs at Lamba=1 O2-loop controlled unless it's under boost at which point it goes to open-loop no-O2-sensor mode with a fuel ratio target of 12.6:1.

And, if you can speak on the breather as well.

All of the Beta kits have a 1" (maybe 1.25" - I'd have to measure after 15 years) breather into the ProVent. It's combined from a oil filler "hose plate" with baffle very much like GB's baffle (which was of course years before G.B. started selling his) along with the stock S4 cam cover breathers. On mine the driver's side - and mine is unique AFAIK - is vented from both ports and also combined. This doesn't increase breather capacity but does equalize pressure across the heads. There is no venting back into the intake.

The oil filler is replaced by a fitting and hose on the front of the left-side fuel rail cover.

[Crumpler]

Amazing. Thank you for taking the time to educate us. And, of course all the work over years to benefit the 928 community.

I was curious, did you get an impression from DR why he stuck to having a duel intake set up?
It looks glorious, and has more continuity with the factory layout. But had to be a lot more design work then a single intake route.

[worf]

… did you get an impression from DR why he stuck to having a duel intake set up?

You ask that question like the reason was a secret or if D.R. was closed lip about it. He wasn’t.

It was really simple: The Keel kits, indeed all the supercharger kits with their incredible in-your-face asymmetry offended D.R.’s sensibilities. He maintained that the factory would never have done something so ugly.

I suspect that one can generate “functional” reasons why the symmetry is good. But aesthetics is what started that ball rolling.

[Crumpler]

And I can respect him sticking to his ideals ;)

I ask like that, well, because I have learned to respect others privacy. Assuming there was reason but also intrigue.
I showed up just when DR was winding down his online presence. DEVEK had had whatever ending it was. A certain shop in Wisconsin was pushing aftermarket stuff that wasn’t really field tested.
A guy in CA that said if you did not use his stuff your car would see a certain doom.
People were getting screwed over on custom rim design ( ).
Anyway, here’s to better days.

[maddog2020]

And I can respect him sticking to his ideals ;)

I ask like that, well, because I have learned to respect others privacy. Assuming there was reason but also intrigue.
I showed up just when DR was winding down his online presence. DEVEK had had whatever ending it was. A certain shop in Wisconsin was pushing aftermarket stuff that wasn’t really field tested.
A guy in CA that said if you did not use his stuff your car would see a certain doom.
People were getting screwed over on custom rim design ( ).
Anyway, here’s to better days.

ah, the good ole days.