as summer is coming and i will be getting a fulltime job or two, i was wondering what i could do to beef up my 91 na?

it seems that most modifications work ok with na's but work even better with boost. :out:

are there any good na power mods (not just intake and exhaust that is a given)? could i build my na and then turbo or supercharge it down the road? am i destined to search for a turbo II parts car? :eh: :whatsthat:

does anybody have any ideas?

You can port you engine, under-drive pulleys, change your final drive gear ratio to a 4.3, reduce your cars weight, as you said supercharge it, ect...



What mods have you done to your car so far?

Nitrous works about the same on NA's and Turbo's. https://www.nopistons.com/forums/pub...#>/BURNOUT.gif

oh yeah, forgot about that.

N/A rox.



you can cheat and get some better speed and mileage by putting a good body kit on, like the front and rear bumper wind deflector thingies. i heard they in effectively 5 hp or so.



uh. yea. and flywheel, get a lighter one. again, not REAL hp increase, your engine still produces same, but just get more poewr to the wheels, so its effectively an increase. =)



IM A FNG DONT BELIEVE ME!

real n/a power is called a peripheral port 13b. that along with a good set of headers and ignition and intake mods and your looking at a really fast n/a



now ad turbo and your looking at a wicked fast car

if he were to do a p port, look into spending a lot of money. Id just go with a mild street port and still be able to eat up all those hondas and toyotas. you do a p port that strictly a track car.

lets see... new thermostat, MAP sensor, engine... panasonic head unit with some alpine 6.5" in the rear.

as you can see not much. i had to get the engine relaced when i got it so for cheapness i got a guy to put in a new one. but now i want more power,

my list of plans for the summer are:

a corksport dual exhaust (no they don't make one - but if a bunch of us ask nicely...)

bonez K&N adapter

bonez highflow cat

etc...

is a p port the one done in the rotor housing (like an exhaust port)

as for street porting do i need to get TII rotor housings?

the thing about my engine is its used and tends to smoke at high rpms (ATF trick coming in one week when finals are over)

i was thinking about do a rebuild with different parts from different models (TII rotor housings,N/A sidhousings, ?FD intake manifold?) but i want to not spend too much money this summer so i need to prioritize.

my engine will last as long as i don't push it too hard (or so the ******* mechanic said AFTER he put it in and told me no warranty)

so i figure boltons and whatnot .

as for supercharging or turbocharging which is better. i know that turbos experience lag due to spool up time and i think they would have a shorter lifespan than a supercharge due to all that heat. but ive heard that turbos can make alot more power? could i build an N/A and boost it with the N/A rotors and all?

as for the nitrous im prolly going to get that after i get my engine the way i want it.

oh and did i mention that this will be a daily driver.

(whew long post) :thumbs-up:

a Peripheral port is where you actually add an extra hole in the rotor housing for more air. it requires custom intake manifolds. its a ton of custom work but those produce ALOT of power https://www.nopistons.com/forums/pub...IR#>/smile.png

Well I'd start by gettinng full exhaust on your car, either put one together yourself, or buy one from mazdatrix.



With a turbo engine, you have more hp potential than a SC. Plus a good turbo set up has way more flexability than a SC. But with a SC there is no lag.

One word.... STICKERS!!!



Might a suggest an HKS sticker to start. J/K

big yellow one right. with those i probably get 20 to 30 more hp :baaaa:

ILUV what kinda of after-cat would you suggest. i really like the dual look but no mas dinero

Quick way to about 275HP all motor is this:

Mega street port

680cc injectors or larger

FPR

Custom 3" intake duct w/ ram air in front of the radiator

Fuel controller

Ported manifolds https://www.nopistons.com/forums/pub...DIR#>/wink.png https://www.nopistons.com/forums/pub...DIR#>/wink.png

Dual in/out headers

Dual all the way back

wired sixth ports, etc

make sure your oil stays cold, and fuel stays up...I know a kid that had this setup on his '89 GTU and was running low 13s NA with mostly full interior.

If you want to stay all motor...I suggest a NA cosmo motor instead...BIG ports on those suckers https://www.nopistons.com/forums/pub...IR#>/smile.png

if i was u i would take the cat and set it on fire and stay away from aftermarket cats



:monkeypiss: CATS

Take a look at this web page, they explain the differences between some portings and what you should expect from them. https://www.nopistons.com/forums/pub...IR#>/happy.png

Portings

http://www.corksport.com/rx7/pictures/2rx6824.jpg

Corksport sells a real nice cat-back, and it is only $289. :thumbs-up: You can check out Rx7.com. Or (of course)Mazdatrix

dont turn your car into a ricer with a bunch of stickers

Not that i would want to stay all motor (faster is better right) but where could i get a cosmo motor and how much trouble would it be to put in?

also, couple more questions:

what is an FPR?

i thought N/A motors didn't like abunch of fuel?

how different is the cosmo from the 13b?

how does wireing the 6 port open help, i thought that while closed at low rpms i got more torque?



and as always thanks for the help, you guys are awesome :bigok:



oh and im thinking of converting my car to saki https://www.nopistons.com/forums/pub...DIR#>/spam.gif

In fact, it helps when they open too late or not at all so we wire them open to solve the problem. Yeah, you're right about the very low end torque but it doesn't make a difference on a hard acceleration since you keep it over that rpm. Although it does make a difference on fuel economy and torque when cruising. https://www.nopistons.com/forums/pub...DIR#>/wink.png

In fact, it helps when they open too late or not at all so we wire them open to solve the problem. Yeah, you're right about the very low end torque but doesn't make a difference on a hard acceleration since you keep it over that rpm. Although it does make a difference on fuel economy and torque when cruising. https://www.nopistons.com/forums/pub...DIR#>/wink.png

How do you find the sixth port and what do you do to wire it open?

???

Just above the exhaust manifold you can see two actuators with a short rod going to a rotating valve. You just tie them open the best you can with wire. You would gain a little more power by removing the port valve completely but would lose more low end torque.

BTW you should be able to open them up with your fingers so maybe you just need to lubricate the rod to unstick them. Try this before wiring them open.

*FPR = Fuel Pressure Regulator...its used to keep as much fuel pressure up as you can for higher RPMs. Your right, STOCK NAs don't like too much fuel..however, when you start getting into to porting or using large ports(from a cosmo) you will need more fuel to compensate for the air enrichment.

*I think they already explained the 5th/6th ports wired open thing.

*You can check with Dave Gibson at www.fc3s.org, or check with corksport too about the Cosmo motors.

*The cosmos are the same size as far as being 13B, but they have much larger intake ports then our 13Bs do...I believe they also have better side seals and corner seals too. They make like 250HP or something like that stock w/ no BOOST!

Hope that helps...

Thanks guys https://www.nopistons.com/forums/pub...#>/biggrin.png with all your help i probably have a 250hp daily driver in no time. honda's and mustangs beware https://www.nopistons.com/forums/pub...IR#>/devil.gif



as for the cosmo swap are you referring to the cosmo 13bt or do they make an N/A cosmo? and are there any places where i could get info on the swap?

An easier way is to take the actuators off and just wiring them open like that. https://www.nopistons.com/forums/pub...DIR#>/wink.png

Anyone have Dyno sheets from a N/A?

I have some dyno sheets from 1320 Engineering's testing....but I still haven't got a scanner :(