hans14914

Several years ago, I was presented with the opportunity to purchase a mostly complete twinscrew kit. It is missing the odd-and-end components, but its mostly there. I have had the kit on the shelf for far too long, and it really deserves to be installed.

The reason I never installed it is two-fold: the first being that I have a feeling that my head gaskets really need to be replaced prior to force-feeding, and I haven't found the time to pull the engine and do all the WYIT procedures... hopefully I can take it down this winter. The second reason being hat I have been playing around with my own inverted supercharger project for several years, and have just decided that it is the direction I really want to go. I just like making things difficult for myself

Before I get a ton of questions - yes, inverted supercharging does work on the 928. No - I will not be making a commercial kit. Inverting requires many compromises and alterations under the hood, including a remote thermostat and water bridge (which is made easier with a remote pump).

So up for consideration is a mostly complete first-generation 928Specialists twinscrew kit for the 87-95 32v cars. The kit has been de-badged, and will not be supported by 928Specialists. Any potential purchaser of the kit would have to understand that support would come in the way of the existing supercharger threads on Rennlist, and I of course would be glad to answer any questions I can. This kit has been run before. It had extremely low mileage, installed for one season and only driven to one event, before it was upgraded to the second generation kit. The supercharger assembly has been properly stored since its removal.

The kit includes:

• Autorotor MX-417 1.7L supercharger
• Manifold with intercooler and bypass valve
• Ford "red top" 32lb injectors
• Drive bracket (missing a couple idlers, but will supply part number for locally available replacements)
• Heat exchangers
• Inlet manifold
• Throttle bodies
• Oil filler replacement/extension

To complete the kit, you will need the following supply/fabricate the following components:

• Throttle linkage
• Air filtration system
• intercooler fluid pump (and reservoir if you dont plan on using the washer tank)
• Intercooler plumbing
• Oil vapor/crankcase venting system (Shakvent like system)
• Replacement idlers (part number supplied)
• Belt (part number suggested, belt length can differ from installation to installation, but is easy to calculate with a piece of string after installation)

I am sure there are some other odds and ends you will need, such as chemical products, fasteners, clamps.... etc, but this is an almost complete kit. I do have bin files, and can provide flashed chips for the LH/EZK, although I strongly suggest PEMS.

The supercharger/manifold unit is assembled, and ready to install as a complete module.

If there is any interest, please PM me. This is not a standard "for sale" thread, as I would need to discuss the project a potential buyer prior to agreeing to the sale. For the simple case of following the rules, I am going to post $4500 or best offer as the asking price.

Thanks,
Hans

killav

This should go fast considering a twin screw kit is virtually unobtanium as far as I know......

and I am a super huge mega fan of the twin screw kit for our cars.

Ducman82

got any pics hans?

hans14914

I will get some pics. I have most of the parts at my house, but the large assembly (supercharger, manifold, incjectors.... etc) is at the shop with my car. I was going to install it this spring/summer, but it never happened. In the back of my mind, I have had a constant nag to go ahead and do the silly inverted system, so decided to go finally forward in that direction. Selling this kit will finance some of the machining costs to go inverted. It wont be cheap, and it wont be the best install out there... but it will be my own.

Thanks for the interest guys.
Hans

928mac

So Hans, this is an inverted SC which is different then the one AO has in his avitar?

What is the estimated max boost for this size?

Are external oil or coolent lines required for the SC?

Dose the water / thermostate housing need to be modified?

What would your guesstimet be as to the cost of extras required to complete the job?

blown 87

Some one it going to get a really good deal here.

hans14914

This setup I have for sale is almost exactly like Andrew's. It is from the same production cycle. Andrew has since upgraded various components, but what I have is very similar.

I am not selling any of my inverted setup. That is why I am letting go of this, to pursue completing that for my car.

The supercharger is self contained, it does not use engine oil. The coolant bridge does not need to be modified for this kit.

I would probably get myself into a bind if I tried to guess what it would cost to install this kit. However, in a non binding ballpark kind of estimate, I would budget the following:

$150 for intercooler pump and plumbing
$175 for throttle linkage (carb actuator rods and ends sourced from Jegs/Summit)
$150 for replacement idlers
$40 for replacement belt

The air intake system and oil/air separation system are way too open ended to speculate. You could use BMC air boxes, make your own housing for the AEM dryflow filters. Similarly, you could buy a complete SharkVent system, plumb your own Provent, or just use a cheap generic air/oil separater or catchcan... that is upto the purchaser.

As interesting as the twin intakes are, it is easier to tune a single fully utilized MAF, so you may want to consider modifying the intake to use only a single 3.5" intake and house the filter in the passenger tire-well like many of the Keel kit users did. If someone goes this route, I have a SuperMAF module I will sell to make this an easy upgrade. I also have a properly sized DryFlow filter I could toss in with the SuperMAF if that was the direction the purchaser was leaning.

I got a good deal on it when I bought it, and passing it along.

Thanks
Hans

LEADASS

If you price the Specialist kit you are talking $7,500.00 or more, I paid about that for my Murph Stage III. Your set-up requires a lot more know-how but for the right person is a RED HOT SMOKIN' deal. Frankly the twinscrew set up just looks so f-in cool. That said I'm a Murph-man thru and thru.Good luck!

SeanR

Damn.


Debating between death by wife or death by engine explosion.

Ducman82

if i could only make it work on my 16v build....

blown 87

I do not understand that engine explosion part Sean, I do understand that your wife might not be happy if you spent the money on a twin screw though.

blown 87

If I am not mistaken DR has a manifold that could make that happen for you.
I do not know if it is for sale, but it might not hurt to ask him.

Ducman82

iv been talking to DR about that. he is mocking up a water cooled intake some time in the near future i believe.....

928mac

OK so $5 G gets it close to running.
What was the estimated boost?

blown 87

What is the estimated restriction to airflow in the heads?

That question, how much boost has little to do with how much power it makes, a good set of heads will knock several pounds of boost off and make a ton more power.

To answer the question that was not asked, it should get you real close to 400 at the rear wheels, maybe more with your set up, depending on pulleys.