Okay everyone what I have is a 86 rx7 NA and wont to add more horsepower without a swap. Is there anyway to do so? I've upgraded coldair intake exhaust headers and clutch. So what else can I do? Someone help please.

 

Start writing checks to Karack.

 

I Have to agree with Clokker.
Then again,I had to "fix" your Quote a bit..
.........(sorry,just having a little fun.!)
You can add a couple extra Hp's by getting the engine to breathe and put on a better exhaust,but after that you are looking at some money,and if your Budget is just Slap on air filters then you need to re-think the "shape of the Box"..because you will be thinking Way outside of that Box.

 

lol.

you've already done most of what you can on the outside of the engine besides a functional way to adjust engine operating perameters(standalone EMS).

porting the engine will get you the most results but at a cost of noise and further yet fuel consumption. ie stock ports- 170whp<street port swapping the exhaust port sleeves-190 to 200whp< peripheral porting - 275 to 300whp. in the middle area is street ported and bridged 4 port irons which will put you at low to mid 200's, but 4 port irons aren't always easy to find. all these figures require a standalone EMS to get the best results.

making power is all about how well the engine can breathe and throughout the power band. intake and exhaust are the first steps, beyond that it is up to the engine and it's managing systems to make more. the stock intake systems on the FC simply will be a bottleneck once near 200whp, regardless of how extremely the engine is ported. 4 port racing intakes and carbs actually have more room to grow airflow wise than the stock 6 port intake will, but efficiency is reduced due to it being now carbureted.

in most of the higher end cases it is cheaper to swap in even a stock turbo engine, making the same power easier. if you're all about all motor engines then these are not going to be freindly in labor or on your checkbook. the CHEAPEST alternative is to start stripping the car of dead weight, making it ultimately faster while making the same power.

 

what kind of upgrades are you talking about since im also planning on sticking with na

 

first step is putting the car on a dyno and see where it is, you can do this for about $50. this will tell you if the car is even running properly and putting down the power it should. stock series 4 puts out about 135whp, moderate intake and exhaust mods should push it in the neighborhood of 150whp. add about 8% for a series 5 which runs about 145whp stock.

 

Maintenance, the simple key to the most power you can make. You take good care of her, and she will take good care of you.

 

your vernacular is incorrect. you wont be adding horsepower. you will be freeing up power lost by bad stock ports or bad exhaust whatever you have.

power adders are forced induction and nitrous.

 

What about a s5 "block" with rx8 eshaft and rotors?

 

nope.

the RX8 gets most of it's scavenged power from an even more sophisticated intake system along with the side exhaust ports.

 

Works kind of like the "supercharger" I think the new ls1 has the same concept right? I may be wrong tho

 

port runners are clamped to increase air velocity at lower engine speeds, this increases low end response. at higher RPMs more ports open up to add more volume yet keep velocity semi consistent.

the renesis has more compression but it is arguably already verging on the limit of using everything that it can cram into the combustion chamber as is. the exhaust ports also act more like a tuned header versus free flowing.

some people have claimed making more power from LESS compression.

 

Is that because there is more room in the bowl of the rotor for the burn to expand? Or something along those lines.

 

once you compress the air so much the space that the charge takes will become a detriment.

piston engines have come a long way to designing more efficient combustion chambers but the rotary engine has a long and rather awkward chamber.

 

the increase in compression is mainly used for economic / emissions reasons.

put an s5 intake on there to bump up the horsepower, and get a really nice header. when i say intake, i mean everything.

then just get something to adjust fuel some and you will be pushing around 150 to 160.