OK, this is the superchargin' plan!

[Roastin944]

I know alot of you guys on this board know ALOT more about what 944 can take. This is my plan on how i am going to supercharge it, engine management, etc.

90-92 VW Corrado G60 Supercharger - Centrifical

Intercooled - 951 intercooler most likely

MSD Boost Timing Master to Retard timing 1-3 degrees for every lb. boost increases.

Magnecore 8.5 mm wires

Fuel Management:
Option 1 - Audi 5000 cold start injector used as fifth injector with a dobbs pressure switch that will activate the injector as soon as 2 lbs is reached

Option 2 - Adjustable fuel pressure regulator and 944 turbo injectors

And a bypass valve - Bosch from a saab or mazda mx-6

And i already have a full 2.5" exhaust with 2.5" high flow cat and muffler!

I am going to most likely run 5-7 lbs

Do you think the 5th injector will be ok for this and turbo injectors wont be needed? Would turbo injectors be to much for only 5 lbs?
The pressure switch and injector is cheaper but maybe not as safe!

Does this sound like a good setup? Do you guys think it can take it? I have done alot of research and this sounds like it will be very good, i wont detonate because i will be retarding the timing as boost increases, it will be intercooled even on 5 lbs, and more fuel is going in 1 way or another! Any suggestions, I know you will say buy a 951 but i really want to try this, i love fabricating, Thanks


John

[1.2gees]

G60 supercharger sucks, I'd go eaton instead.

Intercooler is not necessary for a few psi of boost, I would skip this.

Magnecore wires would also be a waste of money, not necessary at all.

5th injector though may work, is not a good idea. If you're doing 5psi, I'd go with a fuel rail from a turbo 944. Setting up your fuel curve will be a whole lot harder than you think btw (next to impossible to get right using the factory DME).

How are you going to retard timing?
Ahmet

[SoCal Driver]

Fix the suspension first so you can keep all these future horses on the road.

[Roastin944]

Im going to use a MSD Boost Timing Master, you can adjust it to retard the timing 1-3 degrees for every lb of boost.

How will a fuel rail give it more feul, yah it will hold more fuel but something has to be giving it more fuel like the 5th injector or bigger injectors and an adjustable fuel pressure regulator to flow more through the injectors. Also on the speedforce racing kits they dont use a bigger fuel rail, just an adjustable fuel pressure regulator for 5 pounds and an adjustable fuel pressure regulator and turbo injectors for 8 lbs.
Yah i know the intercooler isnt necessary but wouldnt it be safer? And give me more power? If i choose to upgrade to more boost i will want an intercooler.
Also on the stage 1 with no intercooler running 5 lbs there is no bypass valve but on the 8 lb stage 2 with intercooler there is a bypass valve! Why is this i thought you ALWAYS needed a blowoff or bypass with forced induction? Thanks for the advice,

John

[Andre]

look into calloways turbo system for the 944. They use a 5th injector type intake, you might wanna try and find the whole intake from them. If you get an intercooler dont spend 250 bucks on a 951 intercooler, gte something small and cheap.

[1.2gees]

A turbo fuel rail will come with the rising rate fuel pressure regulator (boost dependant) that you want, along with the injectors, hence I say get the whole rail, it'd probably be cheaper too.

The intercooler will cause a pressure drop. I personally don't think you're heating the charge enough @5psi to warrant an intercooler. You may want to grow past however much power, but can NOT do it long term with the cast pistons, con rods, and all the other weak parts on a 944 non-turbo.

Also, use a Bosch blow off valve from any turbocharged car, they're cheap, and plentifull.
Ahmet

[1.2gees]

A 5th injector is not a good idea for several reasons, one of the most important being placement. There's not an efficient way to position a 5th injector to get good fuel atomization across all 4 runners. If you put it on one end of the manifold, it'll richen some cylinders more than others, this is not desirable obviously. If you put it closer to the throttle body, the fuel mist is likely to condensate, and drip on the manifold this time not only richenning some cylinders more, but also adding to the atomization problem. There's another issue, when the 5th injector opens, you're giving it fuel from the same supply as the other 4, so yes now you have 1 more open injector, but also less pressure for the other 4!
Ahmet

[Roastin944]

Thanks for all of the advice, So will the turbo fuel rail, rising regulator and injectors hook directly to my engine, the lines and everything? Also what controls the rising rate fuel pressure regulator, a vacumm line that hooks up to it so it knows how much boost there is? Thanks again

John

[Scott R]

DO NOT EXCEED 5PSI!!!! On the N/A engine you'll be sorry. I have pictures I can show you that would turn you white!

BTW, The only right way to do this is to get a 951 motor, you get the sodium filled valves, and the lower compression pistons.

Of course you could always just bag this silly idea and get yourself the real deal. 951 ALL THE WAY!

Seriuosly I spent like 9k supercharging my 85.5 and all I ended up with was a blown rod bearings and burnt valves.

[Scott R]

Sorry had to add some more, once you get a 951 you can get all of the REALLY SUPER COOL suspension upgrades. Like coil overs and 17" wheels.

You're in love Loveland right? We will have to hook up sometime and go for a ride in the 951, we can turn you back from the dark side of supercharging!

[Roastin944]

Did you use some kind of engine management? Retard the timing at all? Do you know what you did wrong or is it just that 944 n/a cant take it? go to homemadeturbo.com and there are piece of crap hondas that run 8 lbs on stock motors without building them and they run fine! I would hope a Porsche could take it better than a honda! That would be great if you could send me some finished pics of your supercharger project and pics of the motor afetr it died, etc, it would help me, my email is Roastin944Turbo@yahoo.com
^even though i only wish i had a turbo!!

John

[Roastin944]

Yah definetly, that would be great! I want a 951 alot, i know its the best bet but i dont have the money so im thinking of the best way to suit my needs. The 951 is also better too because the stock brakes and suspension is better too! I want better suspension brakes and speed and i know the 951 would give me the best of all 3 worlds but for now.... How old are you if you dont mind me asking? Cant wait for the ride, Thanks

John

[Blackfoot]

http://www.autotrader.com/findacar/vdetail.jtmpl?car_id=114512005&dealer_id=&make=POR&distance=300&max_price=&model=944&advcd_on=n&end_year=1989&min_price=&certified=n&address=80206&search_type=used&advanced=n&start_year=1986&color=&car_year=1986

http://www.autotrader.com/findacar/vdetail.jtmpl?car_id=114526732&dealer_id=&make=POR&distance=300&max_price=&model=944&advcd_on=n&end_year=1989&min_price=&certified=n&address=80206&search_type=used&advanced=n&start_year=1986&color=&car_year=1988

want more?

[coupe]

I wish I had these cars for sale here in the middle east...I'd grab both of them for that price.

You guys living in the USA have no idea how lucky you are when it comes to Porsches and spare parts prices.

Get them now!!!!

[marksportcts]

This is my old Callaway kit, now in the possesions of Alex/ae1969



Last one shows the 2 RC Engineering 440cc additional injectors.


My current set up is a SFR Supercharger kit

[marksportcts]

Oh, and consider the J&S Safeguard, as it has the BTM plus a knock sensor that pulls timing when/if the motor starts pinging.

I ran the CTS 2 years ago and it knocked and broke the pistons at 7psi. This was on the stock motor, didn't even know until the pistons were out of the car. The pictures show the rebuild in spring of '01. 951 over$ized pi$tons, 951 forged rods, 951 rebuilt/o-ringed/ported/polished head, Centerforce DF clutch, 951S tranny. I had it at about 15psi.

And consider brakes/suspension as well.



And DO NOT USE TOTAL SEAL RINGS!!! They gouge into the cylinder walls, which is why I had to get over$ized pi$tons. Had them put in when I pulled the motor 5 years back.

[ae1969]

That supercharger looks beautifull mark..... I hope you come up in the summer..... maybe we can take the cars to the track....and see what a couple of 944's will do in the 1/4 mile.

I have to finish mine up over the next few months. I am also working on the wifes convertible, which may give us a run for our money...... we have a supercharger on the way for it! (I can't believe how cheap it is to mod a mustang ).....

[Roastin944]

What all comes in the SPR supercharger kit besides the charger, brackets, intercooler, piping, hardware? Thanks

John

[marksportcts]

It also has the air filter, MAP conversion, chip(still in the works), 7" billet crank pulley, longer belt and Bosch BOV. I had Greddy Type-S flanges installed, one on the Head unit outlet elbow and one on the intercooler/TB pipe. The 2 additional injectors are not used as the stock ones, 23lb/hr got replaced with Siemens 42lb/hr units. They are there just in case I do need them. They are 2- RC Engineering 42lb/hr. And you have to remove the AC compressor for this kit. Huntley's kit does not.

[ae1969]

Mark..

I see that aurora ignition in your pic.....

I have contacted them about the same setup....

Why didn't you use the MSD that you had??