GoRideSno

If you wish to reply to this post I ask you to number your question in sequence with the one before it so a FAQ will emerge. I expect most of the judgment to come from the questions and comments as they unfold.

I had wanted to come up with a formula that others could follow and add power to their cars to make them more enjoyable to drive and add to its value. I thought the 928 lacked the options other cars have far as dollars per HP go. I felt this lack of affordable power was holding the 928 back in value. For example you can hardly find a 5 speed “93 and up Supra Turbo for less than 40K. This car was about the same price and only slightly faster than an “87 5 speed S4? Why is it worth so much then? Because you can spend about $500 on a stock Supra Turbo and make 500HP. Yes, I know what the 928 was designed to do; we just can’t drive that way in the US. I started almost 1 year ago on a mission to supercharge the S4 for $1500. As it turns out, that that was a lofty goal.

I am not asking any one to buy anything here. I am posting to gauge the potential of how many will want to supercharge their car as I describe below. If there is enough interest I will make a significant investment in tooling and a significant investment of my time and start making them. If there’s not enough then that’s cool too. I can say I tried. If I do get started about 4 systems are taken already. The remainder will be sold on e-bay at once via buy it now to selected buyers. I will offer a 100% money back satisfaction guarantee, good for 45 days after you receive the parts you get from me. I’ll even pay return shipping. One of every system I mention below will be tested and dynoed on my car before it is ever shipped. Prices don't include tax or shipping.

Within 3 weeks to a month I could have 10-12 or so supercharger systems finished total. I think I will make 5 non-intercooled ~4 psi systems and 4 intercooled ~8-10? psi systems accepting the rebuilt Jaguar M112 and then maybe 1 or 2 of each for the Magnuson MP112 and the Whipple 2.3 twinscrew.

Lowest price would be for the ~4psi Rebuilt Jaguar M112 non-intercooled setup. (System N1). Cost would be about $3600 total if buyers used my parts and bought the off the shelf stuff on their own. A source for the Rebuilt Jag blowers would be www.canadiansuperchargers.com. They quoted me $600USD each if I bought 3. I used $700 as the figure in the total price above. They had several in stock ready to go and several more to rebuild. If you ask them usually they’ll auction a blower on e-bay. I would provide a list of where to get the other stuff. It’s all readily available. I have not installed on a MY 85-86 yet, so not sure if I’ll be ale to offer a kit. For the N1 setup the 85-86 systems may cost up to $335 less because they may not need injectors (they have 24#) and will use the stock throttle body. This could be later upgraded to the IC1 (below) with air to water intercooling and higher boost for about $1450 to $1550 more.

The next step up would be the ~8-10 psi intercooled setup using the Jag blower (System IC1, a little under $5000 total). Same idea, buy my parts and get the off-the-shelf stuff on your own. Add about $700 for a new MP 112 (System IC2, about $5650 total).Add about $1500 more for the Whipple 2.3 twinscrew (System IC3, about $6450 total). The Whipple will make significantly more power than the M112 or the MP112. I am in the process of getting figures from Whipple industries. Whipple Claims their twinscrew compressor to be the best supercharger of any kind available Potential flamers note, I didn’t say it they did. Read about them here

Again, please post your questions below numbered in sequence. If you wish to let me know you are interested you can PM me. If you are not registered on the board you can e-mail me goridesno@hotmail.com.

Enjoy what evolves in the replies below. I'l enjoy trying to answer to questions.

Andy K

GoRideSno

To give an idea of price breakdown here are the parts you would get on your own for the N1 system. This is all included in the total cost I mentioned above.
Throttle Body $130
Boost Gauge 55
Bell 2025 FPR 190
30# Injectors 225
Supercharger 700
Air filter 35
Belts 50
Tensioner pulley 20
Air/Fuel Ratio Meter 140
Various Hoses 15
Fasteners 50

As you can see just under half the cost comes from these parts. I even have most of them listed a little high. For example the throttle body is $100 from 928 int. The crafty individual could save a few bucks.

Andy K

Jessa

Q1

Any plans involving the 16 valve cars?

John Struthers

Andy,
Suffice it to say I'm hiding loot from the wife ... again ...
This time it's a V.A. Disability check of $300. per month direct deposit to an account that won't even send a Tax statement as per my instructions.
I hope I'm not the only one without a 32 ft Cabin Crusier, and a condo located around Vail,Colorado.
I have to plan expenditures long term as I have a 14 and 16 year old.
College funds, retirement stash, and now one of my yard ape's is driving $$
I figure a year to buy your low end system.
This is assuming you assemble and install one as a test bed on the older 4.5L sHARKs.
I realize there is a lot of aggrevation involved but at 4/5psi of boost there should be no mapping problem -I hope- as the early models aren't chippable even if you could burn one. And 4/5 psi should keep us from detonating, and, I'm guessing here, we might be able to keep the OEM injectors/pumps.
The N1 seems like the system of choice as well as price for me.
And yes, I realise the performance improvement while noticeable and adequate won't come close to the IC1, IC2 and IC3 systems.
I'd go this route for cost effectiveness -dollar per HP- rather than do the heads/swap heads, swap cams, bore, stroke....
And I actually believe it would be cheaper to swap engines to a 4.7 Euro, or,
just buy a 86 1/2 and newer than do a lot of expensive work on a 4.5L.
It sounds like you have a handle on things.
While I'm saving I hope to see some posts on installations of your setups and the resolution of any as yet unknown teething problems.
Thanks for the footwork!

hacker-pschorr

The Supercharge'd world of 928's just keeps getting better!
Any pics of the complete install yet? The nightmare photo of huntley's half done install is still haunting me.

Only one question about your install. Does it require a hood scoop?

If all goes well, my 81 US car will the the test bed for Tim's kit.

Mike LaBranche

Q3.

Will you be able to upgrade from N1 to IC3 by adding parts and swapping blowers e.g. start with N1, add an IC later, finally bolt in the twinscrew huffer?

BrianG

I'm in for the N1 kit when you figure out the '85-86 application.

I'd just like a little more ooomph than this wonderful little touring beauty has in stock form, and the 4-6 lb. boost level sounds like JUST the ticket!!

If I wanted a stoplight rocketship I'd huff a 5 liter Furd.

Shane

Andy,

So many choices these days!!!!

Q-1. With IC1, would the cross brace be able to remain where it is?

Q-2. How much HP will the Jag. blower support?

Thanks for the timely heads up!

Gregg K

Hot rod Hummer?! Jeez, that's just wrong.

I'm very interested in the supercharger setup. I'm still figuring out how the fuel injection works , and I've only owned the car a few months. And I have my own machine shop, and would actually like to do whatever fabbing I can.

If I get a supercharger, I want the coolest, neatest, most awesome one. I don't care for gobs of power, just a really neat setup.

Maybe I shouldn't have posted this, as it probably doesn't aid you in your effort.

Jfrahm

I recently looked at and drove a Vorteched 928S4 Auto. It was pretty fun to drive, a little rough around the edges though (and the gear whine from the Vortech was terrible.) As I'm at altitude, I could see restoring some lost performance with a clean blower setup, but I would not like the car to become too much of a project (I have other projects) or to no longer be a turn-key daily driver. However I would probably not buy a system, I'd rather scrounge it up myself. I'd probably buy a few parts though.

-Joel.

BrianG

Joel..................

you gotta quit smokin' that shi* !!!

GlenL

No, I would not.

Funny, no choice for that in the poll. But you're selling the things, aintcha?

PorKen

GoRideSno - Party on Garth! (Unfortunately I can't participate in your poll with my 4.5l. )

Q5: I've read your manifesto a few times and it's still unclear to me what specifically will be in your kit?

Q5a: Also, are you eventually going to offer your trick manifold, other parts as separate items? I think many of the folks that would consider your system are tinkerers like yourself, and want the satisfaction of engineering their own system. The manifold doesn't need to be reinvented, so people could start with that...

PeteS

Good point. I know that depending on what model of Vortech you get, some are surprisingly loud, while others you can barely hear.

Q4?
Andy: Back when you were working on this project you mentioned that the blower was pretty loud. How loud are the systems you're proposing? Are these different designs or blowers now that are quieter?

bcdavis

I would have concerns with smog issues in CA.
I'd like to know if that is a problem with your car, when you go to get it smogged.

Also, I am running an 83 Euro with CIS.
So I am not sure if that is an engine that is ready for installing a kit onto.

But I would say that the s4 people already have a lot of supercharger options, and they are pretty healthy cars to begin with. The s2 is the car that needs boosting, since it is underpowered,
especially the US version... I think a lot of s2 owners would be interested in a bolt-on, inexpensive blower, that will push them into the 350-400 crank HP range, without tremendous modifications to the stock fuel system, etc...