Tim Murphy

News:
March 2004
Supercharged and Intercooled 16 valve car development

The development of a 16v SuperShark kit for the 1980-1984 16 valve cars has begun. The kit will be done with the same integrity and completeness as the S4 and later cars, and designed specifically for each model year.

This system will use the Vortech V2-SQ supercharger, a custom air/water intercooler, cold air intake, and run 8 psi boost pressure. Initially the car will be set up and tested at 8 psi, and then run at 10-12 psi. The reason for this is to make sure that all of the components in the system have more than enough capacity to operate safely at the 8 psi target boost level.

Our test car is an 81 US 5 speed, and the installation is looking very impressive. This car will also be fitted with a diagnostic suite of equipment to monitor and ensure that the setup is completely sorted out.

We are very excited to get it on the road and to the dyno. However, we are taking our time, and as a result, eliminating any compromise. I won’t speculate (at least publicly) what the power output will be, but I will guarantee that it will be a significant power increase from stock form; I’d prefer to let the real world results speak for itself. In my opinion, there is no substitute to power claims other than an SAE dyno sheet that states the ‘at that moment in time’ facts.

At Murf928 we fully test and document each kit before they are released so you can be assured that it will be complete, and perform as you would expect.

If our test car works out as planned, look for mid to late April 2004 for availability of a complete Murf928 16v SuperShark kit.

Best regards,

Tim Murphy

Tony

With the price of the older 80-84 16v cars these days this is VERY cool!

Lagavulin

Alright, I will then. Assuming the motor is in good shape:

220 crank hp, 85% efficient intercooler, 75% thermal efficiency on the centrifugal, manual tranny, and 8 psi should yield approximately 302 rwhp.

That's a little bit better than a standard C5 with a 5.7L engine will do.

hacker-pschorr

Lag, how about the 4.7's with 240 crank hp?

Does your calculation take into account if 4 valve's vs 2? Compression ratio? I'm not questioning your numbers, just curious.

Mark

'85 EURO 16v @ 310hp stock???

hacker-pschorr

Mark, your going to need bigger rear tires at the auto-x circuit.

Lagavulin

Using the above specs, approx 326 rwhp.

Yes.

No, not on the horespower calcs since compression ratio has already played it's part in producing the NA hp numbers.

However, for the heat calcs, compression ratio and boost are used (..amongst other things) to produce those numbers.

Even if you were that's ok because it causes me to re-evaluate what I think is true at that point, and make adjustments if I've been mistaken.

Lagavulin

Using the above specs, approx 421 rwhp.

Jim Nowak

How about a 5.4L 16 valve with 944 heads, Devek cams, Devek headers, J&E pistons, and an Electromotive Tec II? Once it all gets up and running it should be around 330 - 350 RWHP naturally aspirated. My Tec II had an issue and has been in Electromotive's hands for a couple of months now but I should be back on track soon. What size injectors would I need to run at 12 psi?

Jim bailey - 928 International

Interesting crystal ball predictions .......... Jim Nowak whose DEVEK engine project started well over two years ago is thinking his engine with all the go fast goodies when it runs right "should be" 330-350 HP . Lag's number crunching predicts about 325 from a supercharged STOCK 4.7 AND OVER 400 for a euro spec 4.7 at 8 lbs boost .

bcdavis

Seems like it's still the smarter buy to just get a stock s4.
With minor mods, it's as fast as that Nowak s2.
And with a supercharger, that stock s4 would be a monster.
Still seems like the s4 is the way to go.
I wish I knew that before I sunk so much cash into my car.
Oh well.
I now have an almost completely rebuilt Euro, with everything running perfectly.
And I still like the "bubble butt" and angular shark nose better than the s4.

BC

YOu have the patience of Job. Seriously. I have been without my car for over 1.5 years for MY OWN FAULTS, but if it was somebody else that I was paying? Lets say I would be in serious counseling

John.

Inertia dyno sheets don't tell the whole story... Regardless you should have good results with that engine while adding the pressure.

hacker-pschorr

BC,
I dunno, if I did it all over again, I'd still buy a 16V. Why?
1. you can pick up damn nice 80-84 928's for $6k - $8k all day long.
2. I think they look better
3. I like the sound of a wide open 16V vs a 32V (call me strange)
4. Parts are cheaper
5. Much simpler design.
6. 16V Spyder is a reason all by itself
7. You can have fun in stages. Pick up a 16V for $8k, drive it for a season, work the bugs out (don't all new 928's have'em?) have some fun. Upgrade the wheels, brakes, whatever. Then bolt on the blower and enjoy having a new 928 all over again!

There's something about the hot rodder in me that would rather have a modified SC'd 16V over a stock S4 assuming all costs are equil and HP is in the same ballpark. Per Lag's calculations, the 16V could squeeze out a bit more power in stock form (with the SC) if so, all the better.

hacker-pschorr

Your right John. (is it one period or two today?) drag racing downhill with a tailwind will tell the whole story. Can you knock this sh*t off for one thread please? It was beat to death in the last thread. Go there and argue with John..