Electrikhead

Hey guys,
I own a white 1986 Rx-7 non-gxl, as you all know there was not a turbo option in this first transitional year from old to new body style. My Car is in Tip Top shape only having one owner who was an elderly man, it was his sunday car ( odd that he would pick this one but hey more power to him), anyways like i said everything is running smoothly i have already replaced the entire suspension with Tokico and i will be doing other mods down the road.
I have read numerous books about the subject of turbo/super and i seem to get either half-assed answers or no one knows, my engine has 96,000 miles on it and runs smooth as silk. Now for the important question which should i do Turbo or Super charge? Plz help me and let me know on which one and what else needs to be done if i do it.. i.e. Flywheel..clutch..exhaust...
On a side note i have been told Supercharging would be the least detremental to the engine
anyways your thoughts guys........
thanks
sTu

Ryde _Or_Die

My first choice would be to get a TII. If that can't be an option then I say supercharge it. Its different and will be good to maybe 230+rwhp. Just don't expect the engine to last too much longer once you go forced induction(that is if its the stock original engine).

Electrikhead

Yeah i dont plain on buying a 2nd gen tII i would just get a 3rd gen, but what i have read on supercharging from camdemsuperchargers is that they apperntly dont hender engine life at all, well at least not much at all, Anyway plz be more Specific in your answers guys im considering both and i need the best imputs thx so far though

rotary>piston

i think turbo would be better for engine life since you don't boost unless you rev it up, but with a supercharger you're always boosting.

Juan

iTrader: (28)

Does Camdem sell a kit for fuel injected cars? The ones I've seen, require you to go carburator BUT I saw one that used that same blower and had some kind of manifold adapter to keep the fuel injection.

I would go supercharger because its different and theres no lag. Theres a couple of guys on the forum that have a supercharger on their cars. I'm not sure if theyre still active on the forum

Rxmfn7

iTrader: (4)

My vote would be for a Supercharger , just for the fact that it would be very cool But turboing would be alot easier and cheaper I think. In all honesty it will probably be better in the long run to just sell in and buy a Turbo2. There is a good bit of work involved in turboing a N/A rotary, and unless you're really set on sticking with this car, buying a T2 would be alot easier. If you are going to go through with it, there is a ton of info on turboing a N/A in the archives, do a search and look for posts by Aaroncake and bambam7 ( I think thats his username), they are 2 people I know of with up and running N/A-T FCs.

Rxmfn7

iTrader: (4)

That kit was discontinued. Problems with brackets breaking, and the pulley was sized so that it over-spun the S/C after 6k rpm. "SuperchargedRex" was a guy with a white 88SE with that kit. Think the made 215rwhp untuned. I actually almost bought that car off him when he sold it.....*kicks self in *** for not buying cool supercharged FC...*

Electrikhead

Yes you have a point but i have a great car and im willing to fork out the dough, because i hate going through the whole buy/sell bullshit, i was also reading that Nelson makes good superchargers as well, The guy that posted earlier had a good point, with putting on a turbo i could still have good fuel econ cause i could control the boost and it would be belt driven like an a/c straining on the engine.... but this is good guys keep it up im starting to lean toward turbo. URL's to sites with either turbo/superchargers for sail would be nice too

Juan

iTrader: (28)

How many kits are there to turbo an n/a? None. Supercharger kits are easier to buy and most come with everything you need. If the supercharger kit fails, you call up the company and they help you out. Home made turbo kit fails and youre on your own.

Electrikhead

you sure there are no kits, seems like there are some at like Hksusa.com but i might be mistaken

Evil Aviator

I don't see how you could be asking these questions if you have read numerous books about the subject. Rice magazines don't count.

Try these:
Turbochargers by Hugh MacInnes
Supercharged! by Corky Bell
Maximum Boost by Corky Bell

BTW, I think most of the RX-7 NA to turbo kits are out of production now that it is easier and cheaper just to buy a TII.

Turbocharged2

Ya i was looking at supercharger or t2 on my 87 na also but i found a guy who will sell you a t2 rebuilt engine for 1400 pretty good deal i think thats what i may do i bought turbo off ebay so deciding to put it in or not cause it is a ton of work however after market turbos are alot more powerfull then the ones that come with a t2 or so i heard,

marcus219

You said that car was a grandpa's Sunday car...I would be careful man. I bet that car hasn't been taken over 4k hardly any in its lifetime...theres probably a ton of carbon in there that might free up and cause some serious problems. I bought my '86 that had been driven by a grandma for almost all its life..I got it and drove it like a RX-7 is supposed to be driven (got on it once in a while basically) and I lost two apex seals on my rear rotor doing 25mph in 3rd after 2 weeks. I have the engine torn apart now...and there is tons of carbon caked on my rotor, and pieces of carbon just laying the chamber...Id start giving it some MMO treatments or something to do what you can.

Marc

Bridgeported

I am all about turbocharging but...

If you go supercharged, I say get a centrifugal type unit. Roots are crap. A centrifugal type unit if you don't know already is basically a turbochargers compressor side driven by a belt instead of exhaust turbine.

With this you get the best of both worlds. You get the benefits of a supercharger such as: reliability of having a system with fewer parts than a turbo kit (less things to go wrong), and a simpler install process. You also get the advantages of a turbocharger: way more power can be made, easier to upgrade when you want to, and not full boost at low rpms so you get better mileage and engine lasts longer.

Ryde _Or_Die

Those are upgrades for TII's, not bolt on kits for NAs. A turbo will be more work than a supercharger. There are quite a few people on here that have gone turbo with their NA though. Contact Aaron Cake on here.

Electrikhead

Bridgeport plz clarify on your Centrifugal type units you were talking about....... and marcus219 i understand exactly what you are talking about, i had the same thoughts upon purchasing, and you wont belive this when we got it the 2ndary fuel injectors were not even plugged in, i dont know if this was like this all the cars life or what, but i did get it checked out for the carbon build up and it is fine, its also one of the smoothest cleanest sounding rx-7's i have ever heard/seen its really strange :o anyways guys plz contiune and Bridgeported is their a webiste for this supercharger your talking about?

Electrikhead

Bridgeport are you there???

Bridgeported

Hi, there are basically three types of superchargers. Roots type, Twin-screw (aka Whipple), and Centrifugal type.

Roots types just force a given amount of air into the engine regardless of what RPM you are at. Also, you have to get a VERY large supercharger to flow lots of air to make big power (which means lots of money, lots of weight, and robbing the engine of up to 40% power to run it). This is the least efficient supercharger by far, about 40-55% is comman.
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Twin-screw (aka whipple) superchargers are like a roots type blower, but do compress the air to a certain extent. This is better than a crappy roots, but still not as good as a centrifugal in my opinion. With a twin-screw SC, you get near full boost at low rpms like a roots style, and the power you produce is somewhere between equivalent roots and centrifugal units. The efficiency of these supechargers is decent, in the neighborhood of 55-65%
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Centrifugal units use a compressor housing, and therfore are able to force more air in overall and it varies with the RPMs...generally the higher the RPM the more airflow, similar to a turbo. This is the highest efficient supercharger, about 60-75%, even as efficient as some "lower" end turbochargers.

Physically, all a centrifugal supercharger is if you can imagine this, is 1/2 of a turbocharger. Keep the compressor side of the turbo, and lose the exhaust side. To spin the compressor side, a pulley driven by an engine belt is used - a simple and efficient design.

Powerdyne, Vortech, Paxton, and Procharger are the most popular manufacturers of centrifugal type supercahrgers.
www.powedyne.com
www.vortechsuperchargers.com
www.paxtonproducts.com/blowers.htm
www.procharger.com

If what you want is a supercharger and you want to run higher boost levels and make more power and be more efficient, then the Centrifugal style is the way to go. Whipples are pretty good too... Roots just suck.

Centrifugal Supercharger Explained
http://www.superchargersonline.com/t...sp?RecordID=10
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Roots -vs- Centrifugal -vs- TwinScrew
http://www.superchargersonline.com/t...asp?RecordID=3

Hopefully all this information helps. As you can tell, I am biased towards turbochargers, but when it comes to superchargers I am biased towards centrifugal units (and even whipple to some extent). I am sure there are people out ther who would disagree with me, so don't take my word as golden.
Good luck!

SureShot

OR - go Nitrous..

silverrotor

iTrader: (1)

I'll say.

Electrikhead

rofl nos would kill my car dude, and Bridgeported thanks alot man i owe you big time if you live in nc dinner is on me rofl silverotar

SmokinJoe

Anyone live in the West Coast Area selling a TII? because everyone's saying BUY A TII and I would......IF I COULD FIND ONE!!!!!!!!!!!!!!!!

silverrotor

iTrader: (1)

rofl. I always wanted to know what that means?

Bridgeported

Haha, no problem. I'm the type of guy that likes to share all the information or knowledge I have about rotaries in the hope of increasing everyone elses knowledge and also making the rotary more popular

I don't live in NC, but I might be through there next summer on a vacation if I have time, so sure to keep your offer on the table Just joking.

blue 88

paxton makes a novi blower that bolts on. i think that the guy said that it was a mustang huffer that he used and it didn't hurt his motor at all and the constant boost was the best feeling in the world at the traffic light