jr69187

All my friends V8 heads run chargers and hate turbos. They say there is not enought boost for so much money. They say chargers are the way to go and i have seen the manifolds in couple of places. I have a 85 gs with a rebuild with less than 30k on the motor. I want more power to get the car running better in the 1/4. And i have thought about the swap but i got the car cheap and motor is in real good shape and they have about convinced me to order the manifolds and go steal and charger off something and well they swear they can make it run alike raped ape. They have built several fast 1/4 cars and i have a not so slow turbo regal. But does anyone know where you can find a good kit to do this minus the carb cause we have lots of spares around and we will find something to bolt up. WEll any help is well apreciated.

jr

Felix Wankel

Your friends need to put the crack pipe down. A turbo can produce nearly unlimited boost.

Keaponlaffen

Superchargers just put the boost out faster, because they are belt driven, they don't have to wait until there is enough exhaust pressure to run them. If you want to get the lead off the line but watch your competition blow by you 1/8th of a mile into the race, get a supercharger. If you want to take off as fast as the guy next to you and have a good race based on other mods to your cars, get a turbo.

Your friends are talking the american muscle car, a car that you can't rev up to 8,000 rpm on a regular basis. An RX-7 with a turbo is a lethal weapon because of the virtually unlimited boost and unlimited revs. (well, almost unlimited revs )...

Jeff

jr69187

But a turbo on a 12a is an expensive route and realy do not like the idea of taking out a solid 12a to put in a 13b. I have this problem with when you go fuel injection you need a computer and good stand alone to really put oput the poneys. And i am trying to figure out the cheapest way to get the most power out of a seven 12a. It is already street ported and has rb exhuast and msd 6a and dual coils. now it needs boost but how with out doing a blowthrough turbo which from what i hear run like poop. So i was thinking a charger might be a btter way to go. Plus you get to stay carbed and i hate efi. Just takes all fun out of it.


jr

any ideas are appreciated.

Keaponlaffen

If you can get the Supercharger and manifold for the right price, do it. It can't hurt anything, just don't go taking on 13BTs and such.. heh. A supercharger on your seven wil get you off the line quicker, and then the raw HP will keep you going in the higher revs. The supercharger is definitely a worthwile investment, especially if you don't like EFI . I don't like EFI either. If you don't want to do a lot of mods, get a supercharger. I'm fresh out of things to say, so I'm going now.

jr69187

There is some else who does not like efi. I am so happy seems like everyone thinks efi is gods gift. I hate it way to much money to get an efi up and running why not charger it for the lower rpms launch and boost and in the high end i will still have lots of rotor power it is just up to about 45oo it is a bit dawgish. well i am off to look for an intake and any every done this? if so let me know would like to know what carb you used. And where you got the intake and the charger.

jr

Felix Wankel

Never seen a turbocharged car with a carb before? Almost all the racers in Puerto Rico run them...

MarkPerez

Superchargers or turbos, i think every 7 owner dreams of more power
from there rotorys,,i do,,thats all it needs 200 HP from a 12a would be
awesome..even more then 200 would be killer...I like the supercharger
option VS turbo,I would think before adding a SC,a porting job would
be in order to handle the extra CFM's,,same as a turbo,,take the 3rd
gens with 276 HP stock with twin turbos,,awesome cars,,but from what
i've read, just about every one has had to be rebuilt,along with the
turbos too,,the heat just kills'em both,,and thats BIG bucks,,,Either way
SC or turbo to transform a 12a carbed, to a huffer puffer is a lot of money,,i guess the old question comes up,,how fast can one afford to
spend,to go ??

jr69187

Atkins rotory runs a kit for 2195. intake pulleys and charger. all you need after that is a holley carb like a 650. That is not hard to come by and the ***** to push the pedal. I think sc are great for rotories it gives them power where they need it on the low end not up to but opn the launch. Yes they recommend a mild street port. Which as soon as i get time to track down the kid i bought my seven from i might have that. Actually i am really sure i already have a street port in runs way to goo not plus the kid who put the motor in here said he spent 2300 on the motor. between rebuild and shipping he put it in. I got the car for a beat up regal and 300 bucks. All he could say it was fun but i need money. so i need to find him and find some more out about where the motor came from.

jr

Pele

iTrader: (28)

Mazda Competition or Mazda Racing or Mazda Speed.. one of those Mazda something or other companies sells a turbo charger kit that'll hook to your 12A using your stock intake and probably your carb.

They make em custom, so you might be able to order different adapters to hook it up to a Weber or Holley or whatever flavor carb you like.

yayarx7

link http://www.mazdaracing.com/ for blow through turbo kits.

jr69187

I am not looking fro turbo kits just supercharger kits. Besides i have heard many bad things about blowthrough systems.

yayarx7

what have you heard?

jr69187

Blow through setups are usually ineffiecent and tend not perform as efi turbos. i do not like efi but i do like boost. and i think a supercharger is more in the lines for my seven then a blowthrough turbo. just becuase more oof the line power which i where i want my power and just a tad bit more up top power. face it these things have a good high rpm power ratio. it is just the lower rpms where superchargers put out the ponnies the 7 does not have much. besided turbos off the line slump due to not enough pressure build up. and i just have worked with chargers and turbos on regals and hands down the charger wins. and for the money i can have a killer charger setup or a killer turbo with efi. and i will not put efi on my 12a and will not change to be a 13b. besides there is just soemhting about that woorl from the gears that demands respect

jr

yayarx7

I have to admit I do like EFI.(I have long away plans to build a NA EFI 12a someday)

I do not have much experience with turbos or Huffers but for some reason I like the idea of a bolt on blow through turbo kit for the ole 12a.

Just looking at mazdaracing.com's site makes me drool

I do like the supercharger idea as it is different

but the fact there is only one company with one for the seven makes me sad and a little wary....whatever happened to those camdem superchargers anyway?

Good Luck!

REVHED

Aren't Mazdaracing the ones with the Rx-7 running low 10's using a blow-through turbo with the stock 4 barrel? There's no way I'd put a roots style supercharger on a rotary. They're inefficient which means they make a lot of heat plus they run out of puff on the top end which means you can't take advantage of the extra revs available from your rotary. All things being equal a well setup turbo system will always work better on a rotary.

jr69187

mazdaracing has alow ten but look atkins rotoray car it is insane. Efi is just not in my tastes besides i like being different. Why turbo a car? You go to a show and you look like 50 other cars. But with a charger through the hood and you are sure to stand out. And if you own a seven you should want to stand out. number 2 there is alot less problems with superchargers than turbos such as contollers and electonics a good belt drove charger is simple and easy to work with.

nzrotaman

I found this web site about a super charged rota and thought i would post the link it shows the built up and how they did it
http://www.badrotor.co.nz/featureavenger.htm

jr69187

i am trying to get a hold of them to see what they have to say will let you knwo when i hear something

mar3

iTrader: (8)

If you're going to go that route, you might as well gut the interior, tub the rear and stick in a roll cage. It won't be a sports car anymore with a blower sticking out of the hood. Granted, I'd love one for my '68 Firebird, but I have the rex for handling and high G cornering. Your balance and weight distribution will be toast with a bad ol' 6-71 up front...

MarkPerez

I don't think the series of V8 huffers (8-71, 6-71's) is what is mean't
the camden,atkins, sc's are small,and will not pop out the hood,,
there are 2 sizes of sc's one is a 5 inch, and the other is a 7 inch.
i'm not sure , but the belt driven sc's use a cog belt VS a serpintine.
and about pulley size,,i wonder if they over driven %,,or under driven %
i remember paxton sc's used to have the option of EFI,or a snorkel that
bolted on top the holley air horns,the whole idea is to keep the forced
air (supercharger,turbo ) as cold as one can keep it...Me,if i were to
find a sc, with a snorkel that bolts on top the carb,i'll buy it in a second.
paxton does'nt do that any more,,,,rats

mar3

iTrader: (8)

Look at jr69187's previous statements and then go to the website of the rota. A 6-71 is EXACTLY where he's going with this thread. I say go for broke and drop a Mooneyham 14-71 with a bughat overdriven at 14%!! You'd probably have to section the windshield and cowl to make it fit but it would stand out, I guarantee that. Slam the front, tub the rear...quite tasty, indeed...

jr69187

i am not goona stick a blower through the hood. I am trying to get hold of the people with the drag car and find out what all problems they had. I just want little extra power with out a trubo cause i do not like efi and i like to be different. And it looks like atkins is the only ones with a supercharger kit. I was just wanting to know if any else had done this or knew anything more about it. And i appreciate all the info. Thanks and keep it comming.


jr

Sterling

The Camden kit was going to be my first choice. The company was bought by Atkins. I've talked to Dave Atkins, and he pretty much had me sold on it. But I did'nt know too much about roots blowers untill I read up on them afterwards.
There are a few things that leave a bad taste about the Camden...It has straight, two lobed rotors. It's very simple in design, and a few people that I trust say it's very inefficient. Supposedly, it takes about 70 HP to drive @ speed. Also, you have to drill and tap oil lines for it.
Unfortunately, there are no other roots style blower kits offered for the rx-7.
I've decided to go with an Eaton M-90 from a Bonneville. It's about half the size of my engine, but with some machining, I'll be able to trim it down. (It's cast with stuff on the end for the Bonneville.)
I'll also have to machine intake and out-put manifolds for the SC,as well as ductwork and the carbby box.

But I'm lucky, because I'll have the machines to do it, and I'm pretty handy (I'm a metal worker, anyways).
But even if you don't have these machining tools at your disposal...get some help from your bros, and hunt down (buy) a Mangasun M-62. At least research and price it. There's also the M-90, like mine, but I think in retrospect, the M-62 would've been just fine. I do not know this for a fact, but I think it would still be larger than the Camden.
Mangasun (sp?) slaps their name on Eaton roots chargers, and sells em to the public.
The Eaton supercharger is an OEM part for alot of GM cars. It has to be good...it has to last whatever the warrantee of the car was!
They are rear entry, three lobed, helical rotor roots chargers. Where as rumor has it the Camden takes 70 HP to turn it at speed, the Eaton will take about 40 HP.
So it's just a big giant puzzel. Do you have enough patience to do this by yourself (I mean all the fab work)?
If not, then the Camden is the only option you have for a roots.
Man, anybody can slap on a kit! Even if you do get the Camden, it's still a kick in the pants. I've asked alot of people on these sites about it. It's nothing to turn your nose up at. But if you have the "gumption", you can make something work even better.

Check out "Eaton M-90 Blown Stock 12A Project" on this board. And don't let anyone preach their fulie-turbo rhetoric.
Ever ride in a Caddy? They are really nice cars. Ride silky smooth. What it means is that I appreciate the car, but it does'nt mean I want to own one!
Same thing to all you turbo guys!
But don't tell them all to **** in their hats!...If you do a home-made blow-through system with a roots SC, they are the ones with the know-how! (Or you could try finding a rex owner that already has one set up...but good luck!)
http://www.eaton.com/supercharger/index.html

stinkfist

You should join the Turbo FB mailing list. It's for turbo, Super charged, and EFI first gens. Its a small list with a lot of great info. It won't clutter your mail box with a bunch of post.

I think the way to subscribe is just send a blank e mail to:
turbofb-subscribe@egroups.com

If that doesn't work post a message to turbofb@yahoogroups.com and ask to subscribe.