Hey since people were talking about drifting n/a rx7's on a diffrent thread
first, I own a 1991 n/a M/T and i was wondering how much more would a streetported 13b engine would pull out?
and is it worth it?
I am gonna upgrade the suspension to KYB shock struts,eibachi springs,and poli-bushings
thanks

 

IIRC a streetport is about a 10% gain at the wheels. So if you can do it yourself you are looking at about a $600 rebuild and port. That works out to about $45-$50 per hp. It gets a little cheaper if you have supporting mods in place like exhaust and intake. a little more on top of that if you pick up a stand alone. Gets a lot more expensive if you have to pay someone else to do it. Now if you already need a rebuild then its worth the cash to have them clean it up and do the port because you already have to have the engine pulled apary.


So the question is: Does 12-16 peak hp, and a gain under the curve justify the cost? Not if you dont need the rebuild. If you do need it though then its definitely worth it.

BC

 

like he said, a street port is worth it if you already have your engine out of the car and stuff. I'm running a 91' N/A street ported motor, before i blew it, i could feel a difference between a stock fc and mine, but not a big one. If you're going to actually pull your core out and all that just for the street port, you should have a few other things in mind as well, maybe a fuel management or painting your housings for fun, or you could replace some seals.

 

Thanks guys
well my engine has 145,xxx so the engine could give up anytime
before i make my decision on weather to get a streetport
how much horsepower could i gain with mods on the streetport just an estimate

im looking for around 220hp or anything close

 

What i meant to say is you can get close to the turbo horse power with the proper mods, good tunning, good ports, and the right computer.

 

A good streetport and an SAFC and advancing your ignition timing will get you 200 at the wheels in an S5 NA with the right bolt ons and right port. I'm sure in a place like CA there should be plenty of good builders that can make a 200whp S5. Keep in mind that's your limit unless you go bridge or peripheral. If you want more power down the line you'll have to go turbo.

 

Thanks that sound good 200hp better than 160hp
and some mods and were good
thanks

 

o I totaly forgot the main question
How does the streetported n/a 13b handle drifting compared to the stock engine

 

handle???

Engine is one thing.

Suspension is another.

generally unrelated to each other as far as handling goes.

 

I'm going to go out on a limb and say that if you port the motor, it should handle like a rx7 with 200rwhp.

 

I'm assuming you want to know how would a streetported N/A would perform compared to a stock one? There wouldn't be a big difference with a TII, which is a potent drifter from the factory.

 

LOL! Thanks red_s5_fc3s that info helped me out alot
O.k. im gonna get the street port and make it pull 200hp with mods in time
thanks

 

Here we go again with the 200rwhp NA talk.

 

You know its never going to go away.


We should make a stickey in the 2nd gen section that says:

"If you have to ask how to make 200rwhp, then, no, you won't make 200rwhp."

 

LOL!!!!

 

there has been an outbreak of N/A fever recently it seems...

 

[QUOTE=fidelity101;6941467]there has been an outbreak of N/A fever recently it seems...[/QUOTE/]

Probably because an n/a Rx-7 is the best way to go if you want decent, inexpensive, reliable power for a daily driver. And Im sure thats what a good amount of FC owners want. Plus nowadays everthings a turbo or a drift car. An n/a rotary with some nice power for the street is a little harder to find (at least in my area). Everybody says ohh, just turbo it because if you have the money its easy to make power that way. We all now the ridiculous capabilites of turbo'd rotaries on the street, but being creative and patient to build a powerful daily driven n/a seems like more fun b/c its a little different (when u actually invest the time and money instead of just claiming ur n/a is gonna make like 300whp on a street port with a greddy e-manage......) Realistic n/a rotary tuning/modding is more fun than just slapping on a turbo, or at least thats how i feel. End of ridiculously long response that nobodys gonna read..........peace

 

+1

 

That-Your definately right about decent, inexpensive, reliable power for a daily driver besides that n/a gives you better response on the gas pedal for every little movement on the gas pedal

 

www.fuji-racing.com

If you are going to get 200rwhp out of an NA you will need to look at your intake manifold. Since you will need a stand alone anyway to get to that power, and no one makes a performance manifold for the 13b, ITBs are the logical step. You want superior throttle control then ITBs make even more sense. that being said, I dont think anyone has made a dyno proven 200rwhp NA engine without bridge porting. Not to say it hasnt happen, or cant, but to my knowledge no one has posted a dyno. A lot of theory that it can be done, but no proof.... yet.

BC

 

I am almost certain that Pengarafoo's (sp?) makes over 200 to the wheels. He has a large street port, standalone, and ITB's.

 

I dont doubt it. I just dont think there is any dyno "proof" that 200whp is possible. If there is I would love to see it. I have a streetported/aux BP motor in my NA. I'd like to see what the powerband looks like before deciding whether to drop the cash in ITBs (his are custom so it wouldnt be a perfect comparison) for the RX7 or pick up a miata and go itb on that.

Im sure 200whp is possible. I'd just like to see the dyno.

BC

 

200whp on an FC sounds nice, and it seems there are people that have gotten there, but how economically realistic is it to get that kind of horsepower out of the n/a engine. I myself am working on my n/a, but just for fun. In the end I hope to have a t2 engine swaped in. Only because it seems you get more bang for the buck with a turbo.

Custom ITBs sound nice, but they also sound really expensive!

 

so you guys are talking about getting renesis horsepower out of a 13B? that sounds like a decent alternative to a RX-8

 

http://www.yawpower.com/sep2004.html

http://www.twminduction.com/ThrottleBody/carb_vs_fi.pdf

200HP and then some.