Jean-Louis

If you keep it low boost 5 to 6psi and a good air/fuel ratio the engine will last for a long time. My 84 engine was measured at a true 10:1.

hacker-pschorr

Two back to back DE weekends with two drivers (8 sessions per day) at WOT for 20 minutes is more "abuse" than any street car would see. If the air / fuel is kept in the "sweet spot" at 5-6psi the engine will be fine.

There was a time when every boosted 928 didn't "last very long". 40+ kits installed has proven with a proper setup, these cars handle boost just fine.

Then strap on an IC for some added protection. Jean-Louis Euro ran those DE weekend with no IC.

Iris and Kevin

My mistake, I came away from the last thread with the mistaken impression it wasn't considered possible by most.

LOL...well, if anyone can break it, I can! Carl thinks I live in the Bermuda Triangle!

I'm hoping the numbers will be available by next Saturday, if everything works out as planned. Blew the posi and really need a gasket for the rear to replace it. But I did take it out for a "gentle" little spin tonight and, my god, the horsepower! Amazing!


Kevin
1984 Euro Automatic
SUPERCHARGED

Normy

1. Yes, he supercharged an S2, but 354 hp for how many $?

-Not to rain on his fantastic achievement, something that I certainly have never come close to in my days of wrenching my cars, but I have to point out the cost per horsepower analysis: It looks kind of grim. Most S2's put 270 hp to the ground, so he made 84 hp for approximately $8000. Is that worth it? If I do it just right, I can get into the 13's in the quarter....stock.

2. What would the horsepower have been if this had been an S4 or GT?

-You can see my future thinking from this thread, I guess. I had a bad experience with a turbocharger kit on a previous car, and have shied away from forced induction since, but watching all these people improve their "personal roller-coasters" this way has me thinking. And my knowledge of internal combustion theory tells me that the S2 is NOT the engine to boost...so maybe a different car is the answer.

More on this later, of course-

N!

Carl Fausett

I think the "yes you can supercharge them, but they do not last too long" is now the stuff of urban legend. We all feared that when we began this boosting business over 5 years ago. True - those of us that like to play went above 12 psi and higher found where the stock headgaskets failed and such - information we now rely on to know where the baselines are.

Those few incidents were not the cars fault, but rather the ragged edges of development. We had to learn where the limits were.

But, between Tim and I alone we have more than 40 SC 928's out there, and the customers are running 5,6 and as much as 9 psi on our kits without incident. Then add all the Twin-screw guys... and to my knowledge, there have not been a lot of motor failures there either.

The remarkable heads of the 928 and terrific engineering of the engine are the stars here - we run more boost in the high-compression motors than you are supposed to according to the "books" - and without damage or detonation.

Still, there is no question that when we SC a 10.4:1 Euro motor, we design-in less boost than we do on other low-comp motors, and I insist on an intercooler for them as well.

Wait until Kevin posts his numbers next week - I think you will be very surprised.

FlyingDog

Urban legend or facts? That is what I was told by a few people who knew of several S2s in the UK with blown engines after supercharging them. You are far from the first. I have seen 3 on UK ebay and was told to stay the hell away from 2 of them. The other was a complete unknown which Tom considered importing. You've been saying a 928 Motorsports supercharged S2 has been (almost) done for a long time, but this is the first. I hope for Kevin's sake you got this right.

Iris and Kevin

Hey Carl, I just came back from another test strip around my "track" (1/2 mile side streets, 1/2 mile straightaway on the highway behind my house) because I can't seem to contain myself until that stupid gasket gets here. The car is lighting them, without any attempt on my part, at first, second and third gears! The oil breather hose is still dry as a bone, and the plugs are burning tan. Couldn't ask for better!

Can't wait to get those dyno numbers myself at this point!


Kevin
1984 Euro Auto 16v
SUPERCHARGED

Larry928GTS

Where did the $8000 figure come from? It's a non-intercooled 16v installation. Those are all listed as being under $5000 on the 928 Motorsports web page.

As with most things in life, there are right ways to do things, and wrong ways to do things. I know that there are examples of normally asperated engines, that were making stock horsepower, having catastrophic failures after rebuilds, repairs, or just from various problems on stock engines. I do remember hearing about some blown supercharged engines in Europe in the past. If I remember correctly, those were using the Albrex setup. Were the ones you had heard about using the Albrex setup, one of the currently available kits, or something else?

Jean-Louis

For durability on my 84 euro engine with euro 83 CIS intake I did ~ 11 hours at Road America before the crash (If you saw Katherine Legge crash yestersday this is exactly what happened to me but at 100mph not at 180mph).
Anyway 11 hours at 6000rpm + no problem at all.

FlyingDog

Albrex, FAST, and custom. The one Tom was looking at was a modified FAST IIRC. One of the others on ebay was a Strosek/Albrex.

Imo000

There is probably a good reason no one uses this method anymore. It probably didn’t work on the long run. As a comparison, to raise the CR, one can simply put a couple screws into the pistons tops and the CR will do up. However, I’m not sure how long this will last

You can always just machine out the combustion chamber a little and lower the CR that way.

Carl Fausett

A few quick comments:

1) I think there is a little confusion here. Jean-Louis's numbers are not my numbers, and the engine he supercharged is not the same as the one Kevin just finished with our kit. Jean-Louis's chart above is from Euro CIS (K-Jetronic) equipped 1984 S block. The engine Kevin has just supercharged is the dual-distributer 10.4:1 LH-Jetronic 310 HP motor. BIG difference between these motors and fuel systems.

2) Yes, I have heard that some Albrex-supercharged S motors had short lives also, but again, that is not us nor our system for fueling or intercooling.

3) Please wait one week or so, Kevin and I will get you the dyno numbers. Kevin was so happy with how the install turned out that he posted this thread a little early in all his enthusiasm. His differential is leaking thru the rear gasket, and does not want to dyno until he is certain the rear end is full of fluid. The gasket is on its way, he hopes to get it, install it, and dyno in the next week to 10 days.

Imo000

You don’t have to spend thousands for a basic SC kit. If you are willing and with a little know how, you can build one for under $1000. Since the Euro 16Vs are a higher compression engines, a Vortech head unit that can easily produce 10psi might be an over kill. A simple Paxton planetary SC would be a good candidate for the Euro…... if you don’t mind ditching the AC.

Carl Fausett

If it were only that easy, IMO000.

Imo000

Carl, I know where you coming from and to produce a kit to market is a totally different story. That costs thousands if not tens of thousands to perfect. I should have been a little more specific and said that to make a one off DIY setup where function is more important that the physical look, a basic SC system can be done for $1000.