this question is for the people with supercharged RX-7;
I will like to know:
E.T., reliability so far, modification needed for the instalation(other than the carb).

Does some one knows of a system compatible with the original EFI?

 

hey good question, i want to know too!

 

Mariahmotorsports.com/ Design Energy used to have a Kit (they may still I just didn't see it on their website when I checked just now) that they sold for around $3500. It used the stock fuel injection, but had some problems with engine redlines (the super charger tended to over-rev after about 6500rpm causing failure way before redline) and mounting brackets. You really needed to upgrade the secondaries up to at least 550cc/min as well.

Typically it was $500-$1000 (and about 16 to 20 hours) to put it in by a mechanic, but it appeared that your average backyard rotary mechanic could do it as well.

But at that cost I have come to the conclusion that it would be cheaper to just drop in a Jspec T2 motor/tranny/rear end and a Haltech if you have a convert to run it or simply buy a T2.

Heres a picture on a 13b

 

You mention "carb" in your message. There is another kit currently available that requires a switch carbeuration, the Mariah kit does not.

Mariah is now taking names for their kit. They are not producing it as we speak, but will do so once the list of names reaches a certain number. It is overpriced and it would probably be more economical to just do a TII conversion. But I would like to keep my car fairly stock and retain the ability to return the car to full stock condition. The Mariah kit allows you to retain the fuel injection with a fuel pressure regulator. Also, thanks greatly to members on this forum with the kit, Mariah is very aware of the previous problems with the kit (e.g., missized pulley causing over-revving, weak mounting bracket, etc).

Another option, that I discussed with another member of the forum, is to just fabricate your own kit. It does not appear to be all that difficult - the only custom work you would have to do is get the mounting bracket manufactured and have a tube made to connect the s/c to the throttle body. Everything else is fairly off-the-shelf.

While I am not a mechanic by any stretch of the imagination, I have to believe that there are enough people around here to help pick components out to make up a home-made supercharger kit.

 

Try this http://www.geocities.com/boatseason/ and its links.

 

I have been massing parts books for various mechanical and electronic devices for months now in preperation to my (hopefully) eventual debut into BATTLEBOTS.

Now I have seen the device I am about to describe in just about every flavor you can think of.

When it comes to overrevving the supercharger, i know that a bigger pully will fix this, but as we all know, you will lose bottom end boost.

The device I am thinking of is a variable rate, vbelt drive pully.

There are two faces to a v drive pulley, facing each other at an angle. (obviously)

The pulleys im thinking of are capable of spreading their faces apart or moving them together.

This can be done based on rotational speed, or done by electric servo.

In all cases there is an idler pulley in the belt-line to maintain tension on the belt at any speed.

I'm thinking, that if there were a way to actually mount one of these pulleys on a supercharger, then the pulley could be adusted to rotate the S/C at high speed when at low engine rpm, and then back off and rotate the S/C at lower rpm at higher engine speed.

If then, you were able to actually MAP the pully adjuster servos' function into a HALTECH or some other aftermarket engine management system, then the supercharger could be programmed to provide maximum boost ON DEMAND and NEVER redline the supercharger in the process.

Imagine stomping on the gas, and the Haltech, noticing that the gas is to the floor, and the engine is at low rpm, adjusts the pully on the S/C to be at max available RPM, and then constantly backs off and advances the pulley to engine ratio as the power curve changes.

Hmmmmmm..........

GENIUS I say, PURE GENUIS!

(Im convinced anyway...)
What do you think?!! IS this mapping possible?!
Lets do it! - Im Buying!

Always tinkering...............
Sniper_X

 

As some of you know, I've been looking into reproducing the necessary parts for the Paxton kit.

I've come to realize that besides the mounting bracket and piping to the tb, you also need their thermostat housing; the factory unit will be in the way of the mounting bracket.

Black-Clawson CNC Machining, up in Fulton, NY can reproduce the bracket and the thermostat housing. They quoted me $200 for the bracket as a one-off, $125-140 for larger orders of 25-50 pieces. (I was able to show them one of Phil Garrott's busted ones.) They have an awesome shop, and would definitely be able to reproduce the thermostat housing, but couldn't give me a price estimate without my taking it off the car to measure it.

Next on my agenda is hooking up with John at Intense Performance for the throttle body horn. I figure he can model it after the plastic one that comes with the cars. I've been thinking that I'll leave the elbow between the sc and tb horn to the individual; piping can be handled by any shop that does turbo work, you know like installing front mount intercoolers. You can buy the tubing off the shelf and cut to size.

Paxton has also sold the rights (along with all their parts and stuff) for the SN series superchargers to Craig Conley of Paradise Wheels. Apparently, Craig has been doing Paxton's support for a while. I spoke at length with Craig, he's a real nice guy interested in supporting us with correct pulley sizing, servicing/repairs, etc. Craig also confirmed that you can get a sc setup for up to 17psi of boost, but that comes without a warranty. Cost is $100 if done during a rebuild ($700) or $250 w/out a rebuild.

I'm in the process of putting together the list of materials and vendors, but its been slow going as of late. Stay tuned and let me know if you or anyone else is interested.

 

I have two (one black and one red) 91 coupes that i want to do this to.

I wonder if it would be hard to adapt the intercooler tubing and parts to be the intake?!

that would make the turbo hood actually "functional" for these cars.

In your communications with those in this field, toss out the CVT pulley idea.

I can lik you to vendors for this part and possibly arrange for a modification to an existing unit if required.

 

I'm interested in the final numbers for this.(including the SC kit)

 

I am very interested as well

 

a lil bit of info:
http://www.geocities.com/boatseason/supercharger.html

 

also very very interested

 

These guys sell one, you all probably already been to this site:
http://www.atkinsrotary.com/supercha.htm

I wonder why you couldn't use an AFC to adjust the fuel injection in place or adding a carb? It seems a shame to sacrifice such a beatiful system.

As it is this kit is advertised as being bolt-on but requires you to still buy Carb, air filter, fuel pump for it to work. I've never tried tho...

 

I think every N/A owners interested

 

For just overt 200HP's. I still would rather drop in a T2. It IS still stock and smogable. With simple mods..you can get well over 200HP, easily and reliably.

That kit, if you do not install it yourself, will cost you over $4K. If you do a swap YOURSELF, it can cost half that, or even less if you find a VERY good donor car.

Well...just my $.02.

 

im very interested i would like to find it as a whole kit though theres not to many shops around here who could deal with fabricating a turbo or SC ive contacted mariah and they sound very willing to bring the kit back if they had some response on demand for it.everyone just start writing mariah and maybe they will introduce a kit that works this time