H2

We may be seeing a revolution in building rapid 928s in the Pacific Northwest. Various superchargers, strokers, innovative cam combinations, modified exhausts and intakes, and similar experimentations are resulting in some phenomenal HP gains and some REALLY FAST 928's. One trend that has great potential for adding up to 200 HP quickly is the installation of the newer twin screw superchargers. The fitment is impressive and the performance gains are almost unbelievable. For example, Shane E. (admittedly a great DIY mechanic) installed a twin screw supercharger in ONLY ONE WEEK on his '86 and went from your usual fast 928 to hellaciously rapid! The dyno results verify that no assometer is involved. He can accelerate to 150mph so rapidly now that it's spooky. It will probably take a Nevada road run to unveil what his actual top end will now be....and this is an '86 year car. His results are outstanding. Stand by because other kits have been ordered, still other cars are being stroked, and I think you'll see some things happen that you may eventually want to consider for your rig. At the same time, you may want to buy stock in the tire companies since these modified babies really run! While the downsides are yet to be proven, they'll probably be related to beefing up brakes, and more frequent changing of tires and drive train parts some will strain with all the new horsepower coupled with the urge for adrenalin boosts. Also, big horsepower gains don't come free.

BTW, the Northwest is the home of the great Ott-X crossover exhaust upgrade...and Dr. Ott is always working on new ways to understand and improve the great 928. Also, I should mention that Shane had to do some tweaking to the new system while on the dyno that you or I probably couldn't do at home.

Harvey
Now driving a stock and relatively slow '85S 32V.

heinrich

I share your excitement Harv .... we're witnessing the birth of a fine 5spd S4 stroker this weekend at Park Place motors .... you really should trek out here. As to my projekt, it is also coming along nicely, awaiting parts.

H2

In Resume Speed, Idaho, I used to pretty fast in the 928. But this all came to an abrupt end last weekend, after the Track Attack at the Spokane Raceway and seeing Shawn's car raise four-wheeled hell, and Garth's car cut some fast track times, and hear of all the other projects underway, I'm feeling pretty slow. I'm excited to see how your project car is coming along. Also, can't wait to see Don Hanson get his track steam up again.

Building a stroker is a great approach (I'd love one)...but it's not a fast project to complete. And Garth's cam tricks are admirable (His car ran great). However, bolting on one of the twin screw superchargers gives you lots of horses quickly and I think you'll see a lot more of these air-suckers being installed. There's a lot going on in the 928 engine world all of a sudden, it seems.

H2

GoRideSno

Yes the PACNW has will have an unusually high # of SCed cars soon. 1 done, H waiting on stuff from me, Jim_H will have 2, and I have had more inquiries from the region as well.

FWIW I can do (have done) an install of the SUPERMODEL setup in 12.5 hrs all by my lonesome. I think 2 people could do it in a day easily. I believe Shane would have done it in 2 days if it weren't for his bad crank sensor. We probably would have had got the issues with the rich condition worked out quicker if the ARM1 had been working correcty pre-install. Thanks to Shane's work we have some new info and gudelines to go by.

Shane, I need to get some more info from you before you go back to AK.


Andy K

H2

I'm glad that Shane is helping to lead the way on Supercharger installs (and what he learns will benefit everyone). It's a technology that has great potential for 928's everywhere and could breathe new life (and heightened respect) into an old car that's far from dead, on or off the track.

I should have clarified my note about Shane and his DIY supercharger install. He, like most of us, has a life and a job (not as a Porsche mechanic) and his one-week install included doing lots of other things, in addition to working on the twin-screw supercharger install (don't we all have to divide our time out and work on our cars when we can get to it). In addition to having a life, he's meticulous in his work. On the supercharger install, he looked for bugs, studied how the twin-screw concept worked, redesigned some of the mechanisms to work better on his car, built and replaced parts that he deemed not quite as strong as he wished, and so on. He approaches installs and repairs from the mindset of a mechanical engineer. I have no doubt that he could proabably do this kind of install now in day, if he wished to hurry and he didn't divide his time among other things. He's a gifted mechanic and he likes to do things right. And, as you know, the first time you do something, you stand back and look at it and think about it....as you want to make sure that it's right, can't be done another way better, and will work without fail. Shane is this kind of mechanic. When he had it figured out, bolted together, and dynoed, he immediately drove off on a road trip of probably at least a 1,000 miles, plus tracked his car at the Spokane Raceway. That's the kind of confidence you have when you do something right and you know it's right.

Now...take me for example....I'd have spent a month (or more) attempting to do the same thing....gotten it wrong numerous times...and not been able to drive to the city limits before sputtering to a forced stop. I'd trust Shane with my car on anything. I just wish he'd quit his day job (which pays more) and take up 928 mechanics. I'd take my car to him for all my repairs. It's people like Shane, Devek, Wally, Mark, Kibort, Jim, Kempf, and others on Rennlist who are going the xtra mile and making the 928 a more affordable and enjoyable car for the rest of us to maintain and drive.

The bottom line is that, without the camraderie and expertise of the close-knit 928 community, many of us would be storing our cars someplace and looking at them like collector's items. But it's much more fun to drive them...hard.

Harvey

sharkmeister85

I might be mistaken, but wasn't it Shane who had his front suspension break in the middle of nowhere, on his way out to your neck of the woods, Harvey? And then somehow managed to jury-rig it to get to civilization.
Glenn

Shane

You guys are too kind!

Glenn yes I had the upper a-arm ball joint come loose on me and the tire leaned over into the spring. Yes I did jury rig (using some bailing wire I got from a local farmer)it well enough to limp back to Moscow (Harvey-land) and do a complete repair in the Sears parking lot with tools procured from a hardware store nearby.

Andys' kit was pretty well thought out and simple, I made it more complicated then it had to be, and still want to redo some of it to pretty it up some more. I also hade some very key help in doing all of this. Andy was on the phone explaining the system and routing of things to me more than you know. Also John Davis came down for a whole day and help me with diagnosing my no start situation and Chris Ford and John Speake for pinpointing the crank position sensor as the culprit. Heinrich helped with the initial tuning as I was way rich and fixed a bad vacuum routing I had done and cured my rough idle. So yes I did ok, but I had a lot of support, including some from the competition (Tim Murphy) which was heart warming to see and have!

And of course some key support from the KING in getting those parts to me so quickly!!



Hey Andy send me a pm or something on what you need and I'll get back to you, however I am already back in Alaska.

Shane

Oh and I took the easy route to HP fame!

Adam, Dennis, David, Louie and Don all did or are doing it the hard long route which takes much more patience and effort than I had, or was willing to endure.

H2

Yep...same guy. In fact, he apparently had a major bolt fail and the front wheel assembly essentially fell over and leaned against the inside fender frame and he (literally) used a pair of pliers and bailing wire (from a nearby farmer, since he drives a lot of curvey backroads in Idaho...actually...what else is there?) to hold the front wheel mechanism in place until he could limp to town (30 miles?) then bought some tools at a local shop and fixed the problem in a shopping mall parking lot. I got there just in time to give him some handcleaner. He's kind of a McGiver sort. He's learned his lesson and ALWAYS carries bailing wire with him now.

I would have had to trailer my car to the nearest 928 mechanic....100 miles away....and would have paid a wad for the fix.

Harvey

GoRideSno

So Shane,
You installed the system and then 2 days later you were tracking the car nearly 500 miles from home at 150+mph, and running 12.5 sec 1/4mi and 4.6 sec 0-60? WOW, we are good!

Andy K

H2

You're right about the 150mph+ stuff (that's all I'm saying) and he's also good on the track...both curves and quarter mile. His set up gives a whole new meaning to the term, "twin-screw."

H2

Shane

And didn't use a drop of oil in over 1500 Supercharged Miles!

sharkmeister85

Have you got anything special going on for oil control or crankcase venting?
Glenn

Dave H.

you can never go wrong with duct tape and bailing wire...

GoRideSno

I feel qualified to answer the crank case venting part. It is very simple. The spot where the oil fill used to attach ahs a plate with a fitting welded to it. A 1" hose comes off this fitting. This hose has a $5.95 oil separator on it. This hose then continues to the main separator. A hose comes off each of the fittings on the P-side cam cover and goes to the main separator. The main separator is simply a ~10" tube stuffed with stainless steel pot scrubbers, very simple.
HTH,
Andy K