greenchili

greenchili

I want to give my N/A more power, but I'm not sure what the best method would be.

Does anybody know if a supercharger kit exists for an 86 FC N/A?

Peruvianrx7

iTrader: (25)

it does... 3-4k dollars from atkinsrotary.com wait 5 months and they are coming out with a supercharger kit with the stock fuel injected system( the supercharger kit they have requires you to carb your fc).

If you want power... tru duals. period

greenchili

I'm reading this book called Mazda RX-7 Performance Handbook, and it said that there is a Paxton Supercharger Kit from Nelson, but I can't find it.

Peruvianrx7

iTrader: (25)

Nelson Superchargers


3724 Overland Ave.
Los Angeles, CA 90034
310-204-0128 phone
310-204-5171 fax
Paxton Superchargers, Intakes, Brakes, Seats

Rxmfn7

iTrader: (4)

That kit has been out of production for a few years now, but it did exist. I almost bought a FC with that kit actually...kinda wish I would have. I do believe there is someone selling that used S/C kit on this forum, check to for sale section. I think his username is "88Vert"

That kit had a few problems, mainly with brackets breaking due to poor construction, and the S/C being overspun above ~6k rpm, but nothing that cant be fixed by a few mods and a larger pulley.

greenchili

hmmm....that's good stuff to know.

Now after reading threads like on Aaron Cakes awesome job of converting his NA->Turbo, you won't need an intercooler if your running 8 or less lbs of boost correct?

dorifc3s

I don't think boost is an option for my stock NA.

Rxmfn7

iTrader: (4)

"Need" may be a subjective term...but it would be very highly recommended. Think of it this way.. a stock S4 turbo2 is running ~6.5PSI, with lower compression, and it is intercooled. You are pushing a TON of heat out from that turbo. Not intercooling, even at very low boost, is just dumb IMO. Youre just asking for problems.

greenchili

I wouldn't mind keeping it stock. The next investment I think I might make is a nice Catback exhaust. What are some other good HP upgrades for an 86 N/A?

greenchili

Are front mount intercoolers that much better than the stock on the 87-88 TII?

Rxmfn7

iTrader: (4)

The stock intercooler is actually pretty efficient, especially if you are running lower boost (~10psi or less). The main problem is where it is located, on the top of a hot engine, where it heatsoaks very quickly. If you are going to turbo your N/A, with low boost, just get a stock intercooler, and front mount it.

NCGNETO90

iTrader: (3)

I have heard that it is hard to overboost with a supercharger. The cons for both are.....
turbo - Can overboost easly
SC - It is belt drivin.

TwEaK

iTrader: (6)

fora stock TII Motor is higher than 10psi of boost to much? cause i wanted to boost something like 14 or 16 but i wouldnt mind going threw the trouble of putting a front mount intercooler
TwEaK

zjbarra

iTrader: (2)

There is another thread going right now that will answer this question tweak. Check out the how much boost have you done thread.

rx-7s rock

Um, doing a full true dual exhaust will give you more power. Doing just the cat back doesn't do **** except make the car louder.

Evil Aviator

Roots type superchargers only have about 60% efficiency, while turbochargers have about 75% efficiency. Therefore, a turbocharger will make less heat for a given amount of boost. For those of you who spend months making a cold air intake, you will understand the value of making less heat.

With the advent of ballbearing low-inertia turbochargers, the supercharger is pretty much an aesthetic device, unless you are the type of person who doesn't mind trading power for a more linear boost profile.

The cheapest way to get "instant" boost is to simply sell your NA and buy a TII. The stock TII has very little lag, and the extra cost would only be about $500-1,000. You could probably find many ways to spend the extra $2,000 - $3,000 that you didn't spend on a supercharger kit.

Both can overboost easily if the mechanic isn't very bright. The good thing about the supercharger is that its boost level depends mostly on the pulley, so it's fairly idiot-proof as long as the intended pulley is used.

Madrx7racer

I have never been a fan of the whole "you use power to make power" of the supercharger......It makes sense on some american cars that have plenty of power to spare, but on anemic imports ( as compared to V8's) it seems pointless. my 2 cents.

infinitezero

Funny how i see this thread when I plan on SC my fc. Reason I am opting for the supercharger is the cost and I can do a lot more of the fabrication myself. I have full CNC capabilities and any lathe\milling machine neccesary for any work (welding included). Just looking for ideas on the intercooler, as far as front mount, or top mount.

BlackIceGuitar

if you decide to go with a supercharge go with a centrifugal supercharger.

Though, Turbo would be my first choice.

BlackIceGuitar

Front mount with out a doubt.

infinitezero

benefits of centrifugal over the other (brain fart on words here. )?

Erk

DO super chargers have BOV's?

Evil Aviator

You can make supercharger lobes? Geez, that must be a lot of work, but more power to you.

Roots (Eaton) - Low rpm boost, fast boost rise, poor thermal efficiency, difficult to intercool, mid-price range.
Centrifugal - Full boost at high rpm only, slow boost rise, good thermal efficiency, easy to intercool, least expensive.
Lysholm (Twin Screw) - Low rpm boost, fast boost rise, good thermal efficiency, difficult to intercool, most expensive.

They have bypass valves. Sorry, no cool noises. A BOV could be fitted to a centrifugal supercharger if the engine is running on a standalone EMS that does not require the AFM.

BlackIceGuitar

EvilAviator already pointed out the difference between them.

My experience with them has been they would be a some-what simpler installation. The cost wont kill you as much either. The boost can go as high as 20+ (I believe I haven't looked in a while.)