NewB: Power of a N/A Rx7?
 

Yo, I'm a newb, but i have been trying to learn about the rotary cars (which are awsome!). I know that the turbo engines can make a whole crap load of power, but what about the natrualy aspirated cars. I have not heard any thing about n/a cars, so how much power could these rotaries make going n/a. I'n about to get a 88 rx7 with a 13b non-turbo. So what could i get out of the engine n/a.

Thanks;)

A base '87 na when it rolled off the line makes 143hp at the eccentric shaft (the equivalent of the crank). You can make pretty big #'s with an na, but it will cost you big money to achieve them. Turbos will react much more to mods and keep the price down.

To get big power from an na first you have to divulge what your definition of big power is.

A full bridge port from a 4 port donor with a good carb set up will net you close to 300 (you'd have to get the engine elsewhere as 86-91's are 6 port).

You can street port a 6 port get an exhaust and you're doing well for power.

Go to www.mazdatrix.com and do some reading, there's a load of good information there that's well writen. You'll learn a lot in a short period of time. Then you can re-define your question and move from there.

170 rwhp should be about the max while staying FI

What could i pull out of my 88 13b with an n/a.

Also what would i need to go turbo if i were to do so.

Please..

you can get over 200ho you just have to port it a lot. and Get expensive stuff but it is possible to see over 200 at the wheels. Going carbed is a good option too.

Ok

Do a monster street port and a nice exhaust and take off all the accesories like the air pump and AC and PS and get an e-fan a good clutch a lightened flywheel bigger injectors some stanalone EMS and a bigger fuel pump and see what happens I think it would be more than 170 to the wheels.

Scratch what this previously said.

Is using nitrous on rotaries bad. I've heard different stories on how they can't take it or that nos works great with rotaries. Whats the real answer.

This is so far from true it's not even funny. If you are going to try to help newbies, at least provide correct answers!

Nitrous is a good option, but it takes some knowledge and skill. The nitrous guy around here is scathcart. I'd ask him any nitrous questioins you have.

You probably dont need to upgrade the fuel system to get 170rwhp. Id say standalone,streetport, straight pipes, header, ported intake manifold, removed 5th/6th ports, PA style sleeves, S5 rotors, and a cold air intake and your there easy.

the same setup with a carb done with FI will make more power. Its just more expensive since you need to buy expensive injectors, then an expensive controler, and then you would need a really expensive intake manifold for the FI setup.
People run carbs cuz they are cheap. FI is much better, thats why carbs are nonexsistent on todays cars.

The most powerfull NA rotarys are those with the famed Peripheral port AKA PP. Though it makes big power, its the most impractical thing i can think of. Do a search in a search engine about peripheral port rotarys and im sure you will find why its so impractical.

Sigh. The stock NA fuel system will handle 170HP easily. In fact, it is good to roughly 250HP (with the addition of an S-AFC).

Thanks for the correction Aaron sorry I did not know that.

Aaron are you talking about 250rwhp or fw? I have always heard that the system can hang till about 240-250 fwhp.

BTW, I'm not trying to be an ass. I'm just sick and tired of all the misinformation that is spreading around...

Flywheel HP. Which is still 225 or so RWHP.

I know your not being an ass, I didnt want to say that the fuel system could when it couldnt. Im trying NOT to spread bad info around.

Most you guys are STILL OFF... 170rwp LOL.

My 89GXL STOCK PORT made 160rwp mabey more on a new dynojet. I have dyno proof of 154.2rwp but 158 not recorded then I did more mods like port polish tb , and new light flywheel and clutch. This felt like it made a 10rwp difference throught the band so I would say 165rwp stock ports is obtainable.

240rwp with street port , FI , and Stand Alone EMS because thiers this guy on here who has dyno results of it but I cant really say his name. He races profesionally.

So theirs your unbiased facts with proof from a reputable expierienced forum member. Thnx

I personally like n/a but turbo is fun to just kinda doesent rev as high then you also have overheating problems wich means lots more mods , exc radiator , fuel , intercooler... so if you handy an N/A would be the best way to go IMO

By the way why does aron cake say Carbed is not better ?

If you look at the 6port manifold then the carb setup. The carb is a streight shot of air into the engine with no maf sensor or twisty 6foot of runners. I think going carb woud be the best deal...

Aaron ? How much more power with a S-AFC and turbo fuel pump do you think I can get ?

Why EFI is superior to carbs has been explained here hundreds of times in the last 6 months. Find one real expert who says "all things being equal, carbs make more power then EFI" and I'll pay you a shiney nickle.

You don't need a turbo fuel pump on an NA unless you have some wild porting. Just an S-AFC will do fine, and you should be able to pick up 15 HP or so with tuning.