Imo000

I’m returning my ’93 Trans Am to stock before selling it. I’m removing the Paxton SC kit on it and would like to adapt it to my ’85 928. The AC on my 928 has been out of commission since before I owned it and the air pump belt is already disconnected. If I removed the AC compressor and the air pump, will there be enough space to install a Paxton Novi SSG (last of the planetary design units, same size as all the other pre-Novi2000 Paxton SCs).The SC unit is designed to spin clockwise and the usual spot at the front of the engine will not work in this case.

The kit I have is a pretty good one. Comes with a plate and 3 extra injectors controlled by a Carroll Supper Fuller, as opposed to a FMU. I have an MSD 6BTM Boost Retard Controller, an A-pillar pod with boost and air-fuel gage too. It does not have an intercooler and since this kit is only designed to produce 7~8lb of boost, I don’t think an intercooler will be needed for the 928. I never had one on the Trans Am and it worked fine.

I’m guessing that there will be plenty of room but, would like to know from anyone that has a SC at this location.


Thanks for any help!

Warren928

For the amount of R & D you will do on a kit like that, your time would be better invested at work, then buy a kit from one of the 928 SC dealers who have got a proven method for boosting.
If yours is an automatic, then andy's "supermodel" kit is for you. Pricing starts in the 3G's. Sell your Trans Am kit on e-bay and put the money towards the RIGHT kit.
You may want to tinker for 100's of hours trying to get a paxton right on your 928, but thats up to you.
If you bought all the parts except SC, pulley, bracket and tensioner it would cut off some time but would definately be a major project; It would most likely require some engineering experience to make it reliable.

If it was me, I wouldn't want the headache of a DIY supercharger system.

Imo000

Warren,

I can't belive your ignorance. Do you even have the faintest idea of what you are talking about? What kind of assumptions are you trying to make? How do you think Andy and all the other started? Obviously not with a mind set like yours, that's for sure. Also, what is "your time would be better invested at work" supposed to mean? This project is for my free time AFTER WORK. FYI: I've worked on cars since high school and used the money I made to put myself through college. I work for the Canadian Goverment in the Engineering Division. As far as the engineering expreience goes I'm more than sufficient. I don't like to judge pople without knowing them first, but you sure come across as a short minded person with a very limited experiance in automotive repair. When is the last time you did more than a tune up or an oil change ?????

The T/A kit I'm converting is a high quality unit. I refurbished the head unit myself. Just have to re-fit it to a my 928. Except the bracket and the piping I can re-use everything. Besides, I don't remember any of the 928 SC dealers offering the Super Fueller in there kits. Instead, they go with the FMU route (simple but not as flexible).

I'm not trying to make a kit here to sell or to compete with anyone else's business. Essentially I have a left over kit that I want to fit to my 928. I'm confident that it will work, It sure worked excellent on the the Trans Am for many years.

I'm sorry that everyone has to read this, but your comments really offended me!!!

michaelathome

Imo000,

It sounds like you know what you are doing. If you need help with the engineering of brackets and mounting hardware I would say contact some of those that know directly as they may have already addressed the details of the install. I doubt that you are the only one that have tried to tackle that project.

Good luck!

Michael

P.S. I wanna know how it turns out. Sounds like a lot of fun trying to figure it out!!!

Warren928

Imo000,

You've taken this to a immature and personal level, and that is uncalled for on this forum. It is people like you who belong in the kindergarten forum where tantrums are allowed.
Why don't you use your real name in here so everybody can know who you are and stay away from you, or maybe there is a real good reason you don't use your real name in here.
All I did was suggest that making a kit for centrifugal SC's has already been done by several different vendors, "been there and done that" and there is no challenge left there. You call me ignorant yet I didn't degrade you like you did to me, I don't know your experience and I didn't ASSume like you did that I have none. Even to an experienced person, this paxton SC project would be a big project with more than a few revisions.
I dont need to prove myself to you, but I could run circles around you in the engineering forum if I felt like it. I have the experience, degrees and the training. I have 5 certifications ranging from automotive tech, physics to aerospace, so shut the hell up before you rip someone a new one and stick your foot in your mouth! Oops, you already did!

I'm not a dealer for SC's, so there is not personal profit gain in what I have to say here. With that being said, do whatever you want, I never stood in your way to begin with. Go work yourself silly in your garage. If it turns out as good as the other kits already available then you'll have accomplished what dozens of others have already done and you will have credit for doing it the hard way, and without A/C (If that is any credit to you...?). If you were paying attention in this forum you would know that someone already has a Novi setup on ther shark but it keeps the A/C intact.

Why you think I made my first post a personal thing to you and took offense is still a mystery to me. We're all here to help one another here, but you have declared war on me with your words from your last post. If your having a bad day, go hit a punching bag, because your not going to find too many people in here who will take your $hit. Adjust your attitude the next time you decide to speak in this forum.

shaaark89

i have a vortech in that spot on my track car.

Imo000

shaaark89,

Thanks for the pictures. It helps a lot.

After making room and looking at the location last nigh, came to a design layout very similar to yours. Except, I will try to use the alternator pulley to spin the SC. There is just enough room , with a 1-1.5 cm gap, to squeeze the head unit in place and make it align with the alt. pulley.

Do you happen to have a picture or a drawing of the rear part (rear plate) of the yellow bracket? I could use it as a template for making the bracket for the Paxton.

Thanks for all the help!





Warren,

I will not go into an argument match over this.

shaaark89

i'll get it on the lift after this weekend and snap some pics for you. the bracket is a one off but by far the best bracket i've seen. it has multiple mount points in different planes that will virtually eliminate any flex.

jyoon

sounds like a good project, but how do you get the air/fuel ratio correct? do you use an aftermarket air/fuel controller and just tune with a wideband? do the aftermarket injectors just spray into the center intake manifold? The air/fuel would be my biggest concern after i burned up an eagle talon motor running too much boost.

Imo000

The aux. 3 injectors are controlled with a stand alone computer. This unit measures the pound of boost and according to the setting it slowly adjust the fuel. The way the complete system works is that the original computer in the car will measure the fuel ratio at the O2 sensor and adjust the mixture with the 8 original injectors. The Super Fueller is fully tunable for every .25 or .50, or 1.00 lb of boost. It has a MAP sensor that measures the manifold pressure. However I will need to tune it slowly at the begining, cause the Trans Am setting are probably a little diferent. At least both cars are V8s so the adjustment will be minimal. I know the Autometer air/fuel ratio gage that i have not not too accurate, but with only 7lb of boost I should be able to fine tune it.

A couple years ago I bought another MSD 6BTM on e-bay as a spare. This unit is a mutly spark spark enhancer with a built in boost retard module. Now I have two and this will be needed to control each coil. This is an excellent way of controlling detonation. Works with a controll **** inside the car and can be adjusted whenever required.


Here are a couple pictures of my progress. Yesterday evening and today, I've made a mock up bracket out of heavy-duty plexy glass and aluminium tubing. I figured, using the plexi will make locateing the holes for the bolts alot easier, and it was. On Monday, I will get the required steel and using the plexi as a template I will start fabricating the final bracket.

So far everything is going smoothly, I'm hoping it will stay like that.

Herr-Kuhn

Why don't you hang a better compressor or set of compressors on that car? You can mount two turbos, keep the A/C and flow out a lot more air mid range and top end. The only super I would put on a street car would be a positive displacement type for clearly obvuious reasons.

As a last note...when was the last time you saw a centrifugal on any professional race car? I'm not saying they don't work, but what I am saying is there are much better solutions for what you are looking to do.

Imo000

As I stated in my original post, since I had the car (4 years+) the AC never worked. I already had this supercharger kit from a different car. Why not make it work for this car? It worked excellent for the other one! The SSC head unit flows more than enough air. It was designed for a 5.7L V8. Right now, it has the largest pulley available on it, producing only about 7psi. The smallest pulley available would produce over 10. As you can see, the head unit is fairly flexible for any present or future boosting needs. It might not be as efficient as the newer gear driven types but it still adds 40-55% additional hp to an engine. Isn't that enough? After all, there is always a better/faster setup that someone else has. I'm not trying to build the ultimate SC combination for the 928. My goal is to keep the cost to a minimum with the maximum amount gain. I always enjoyed keeping the cost over benefit ratio to a minimum.

If you do a little more research on centrifugal SC uses in racing, you will see that cetrifugal SCs are alot more common as aftermarket power adders than positive displacement types. They are simple and efficient for what they can produce. Contrary to your statement, they are also widely used in racing. Maybe not as popular with the pros, but they also have unlimited budgets. If money wasn't an object I would most certainly not use this setup either.

It's always easy to "Magazine race". Instead, take a supercharger of your choice an put it on your car.

Imo000

After 4 weekends, it's 99% complete. I'll have to make one small bracket, paint all the piping and the MAF hold down bracket on the weekend. The final location of the SC is where the AC compressor used to be. When the belly ben is instlled it nicely hugs the SC, covering it from the elements. I'll be using and FMU until the winter. During the cold months I'll adapt the Super Fueler system to the 928 and maybe even an intercooler. It rained tonight, and didn't have a chance to take her out for a test drive. I will start the shake down tests starting tomorrow.

Here are some pics of the almost finished product.

TeufelHei

I am inspired, excellent work. Please keep us posted on progress.

crackerfeet

Nice work and you still have 3G in your pocket, now you can afford the BIG brakes to stop that monster.