924Board.org

[ESC944]

Ok I posted an update on the supercharger projects I have been working on, latests is on page 2.

http://www.924board.org/viewtopic.php?t=12580

I would like to see opinions and comments, so please post.

Now my question is this, if you had a source of boost, that was basically available at the push of a button and that generated 3 or 5 PSI depending on configuration, would anyone be interested?

Hemm if HP IS INCREASED AT A RATE OF 8-15 HP For each PSI you run.
Lets see a: 110HP 2000CC 4-CYL RUNNING 2-3 PSI WILL MAKE AN EXTRA 20-40HP AND AT 5-6 PSI MAKE AN EXTRA 50-90HP.

Those numbers are subjective, but current test hold that they are close.

[ESC944]

So I guess not much interest in a part time supercharger, maybe a full time setup?

Or turbo conversion?

It doesn't really matter to me, we have built both, For my project cars, I am not in the buisness, its a hobby for me. Well by buddy is in the buisness, but thats different. I just thought maybe their was a market.

Ah well we still have fun on with cars.

I gather with the exception of the other supercharger thread, people just are generally not interested in cheaply adding boost or cheap power.... strange!?

[Chrenan]

I think for me it would have to be full time.

Something like what John Butera came up with in the 80s for the 924. Now, his kit used Carbs, but I'd like a kit that maintained the stock CIS system.

How much would it be for a system, including the super charger, intake manifold, pulley, and any mounting brackets? Would it be a system that could be installed by a home mechanic with no other changes to the engine required? Could we see pics of one completed system before buying to judge the quality of the fabrication?

These are some of the questions I'd like answered before I'd consider showing serious interest in this type of undertaking.
_________________
1987 951 - M193 Version for Japan

[My924gtc]

All the same as above but I would be interested in a carb set up as well.
_________________
MJ
'81 924 2.0L T
'82 924 2.3L SC/EFI <---online fall '06

Sponsor of the 944 Cup and Super Cup
Sponsor of the "2006 Battle in the Badlands"

[leadfoot]

For a limited boost setup you could retain the stock CIS system, use a small blower with a clucth style pulley sized to deliver 3/5psi and set it up using a microswitch on the throttle for WOT operation through a relay. I know the Audi progressive throttle bodies have this microswitch on them.
Then use the same microswitch to trigger a relay and the operation of the CSV which you would rewire to add the extra fuel under boost as it is electrically controlled.
By monitoring the air fuel ratio at boost you could adjust the boost by way of either sizing the pulley accordingly or using a blow off valve which would probably be better as this would then relieve pressure once the throttle are closed sharply.
A bypass valve would be need to route air around the blower during normal operation and
If you want to then get really clever instead of using the microswitch you could find out what voltages drive the CSV and use a tacho based signal generator like the one Augidog is developing for a rpm based shift light and use this with a relay to drive the csv at the rpm point you desire along with the blower.
Someone else can debate on splitting the CSV fuel line and running another into the manifold from the other side. What this would do to fuel pressure in the CSV line I am not sure. Possibly raising the system pressure using shims might help offset this.
Leadfoot

[Latka]

If I had a supercharger on my car I'd want it on all the time.

[ESC944]

Well I think I have secured a 924 for build a 924 Full time kit.

I will also do the part time setup.

I think we can also prototype a Carb setup.

Then a turbo kit.

All I have currently is a 931 to work with. If I get the 924 then I can do the 2.0 kit.

Proably be Jan before we could test the 924 kit. Finish the Part time setup, then the full time setup, they are two seperate things.

[Ghosthacker]

Hey man I'm really interested in buying a kit. You've already done this one a 944 right? If so drop me a line cause 924S cars have full 944 motors.
_________________
88 924S Red

[ideola]

interested, depending on price. Carbed or CIS is fine with me, but definitely full time.
_________________
erstwhile owner of just about every 924 variant ever made

[leadfoot]

Jaycar now have a 12volt relay designed for automotive use....
at 35$aus ( half that price in US i imagine) you could use it for 12 clutch in a supercharger set to any rpm you want.

http://www1.jaycar.com.au/productView.asp?URL=index&ID=KC5378&CATID=25&SUBCATID=347
Leadfoot

[/url]