eyecandy

I have been thinking about my next project to begin working, hopefully this fall. I had orgianlly thought about a 20b NA FD, but after looking throuigh many of my RX7 Magazines and brochures I have came across the R-Magic P-Ported housings and LIM. Below is a pic of the housings and LIM



What is the life expectamcy of a P-Ported engine?



I know the size and loaction of the P-ports greatly effect the overlap of the engine cycle along with the life of the engine and idle/resposiveness. I have just contacted R-Magic to find out the specs of the P-Ports on the housings.



I am also trying to think about the streetability of the engine ( only reason is for maybe the occasional drive on the street and drive to the track and back). Also If I am not mistaken the secondary throttle plates, which feed the p-ports, open at a slightly slower rate than the primaries. My other thought is to devise away to incorporate similar to how the 5th/6th ports open on the FC's and RX8's, to open the P-ports in a simialr manner, but around the the same time/rpm the secondary injectors kick in (3500-4000 rpm), Like I said before the ONLY reason I am thinking of adding the sleeves is to make it somehwat streetable.



Here are the main parts I have been think about using:



R-magic P-ported housings and LIM

FD Irons

S4 or S5 N/A rotors (or maybe just the 9.0:1)

550 or 720cc primaries and 720 or 950 secondaries

FD UIM/TB

And maybe a Haltech to run everything (anything better?)



Does anyone know of anyone that has used the R-Magic housings and LIM? I have only been thinking about this since late last night, so I am sure alot will change, but what do you guys think so far?

kahren

i think this is meant for a turbo application, since the manifold length and diameter is pretty mcuh gonna be same as stock(u are going to use the stock UIM). if you wanta proper pport exhaust and intake setup are very important. you can quite teh car down some by using a few mufflers in line. you might want to look into teh rx8 rotors, machine teh apex seal grooves to use the older style seal.



i willl soon be makign a custom intake manifold that will open the pport at somewhere around 5k rpm untill then it iwll stay closed, and the engien will be fed by the ported primary ports. the secondarys will be most likely just blocked off completely.



are u sure u want to go NA on the FD you are gonna loose all the TQ

RONIN FC

Why not just run the stock 20B with the stock twins? It will prolly make the same power as the creation your planning, and stay streetable.



What are your goals behind the N/A idea? Or to put it in other words, what the hell are you thinking?

eyecandy

I have a Japanese article (to bad I cannot read it) that has it setup as a NA, besides I am sort of sick of turbos...





To much work getting the 20B to fit right, plus it is added wieght, if anything I would ditch the turbos and go NA..... see above.... I am more or less looking into the impossible, plus peripherals sound awesome !! hehe





That is basically what this R-magic setup is for, although I would have to customize the peripheral port opening and closing some how...

Black8

My dream FD setup(other than a badass single turbo'd 20B) would be a Renesis/6 speed setup all tuned up to avoid the halfassed detuning Mazda did. Probably looking at 265-280hp depending on mods and trim....make one hell of a reliable and fun to drive FD....lighten the crap out of....would be a great autocross car.

eyecandy

I have thought about that, the only thing really holding me to want to install a p-port is because of the awesome sound!!! I have never heard anything sound better!



But I have been think about doing the NA 20B again, what do you guys suggestion?



Peripheral port 13B NA or 20B street ported NA

scathcart

Streetable and PP don't go together. You have to put up with a very high idle and they are illegally loud. To keep them streetably quiet, you'd have to choke the engine off which would negate the point of a PP.



Building an engine b/c it sounds cool is stupid.

jspecracer7

turbo 20B...no other choice

eyecandy

Well now it is my goal to make it streetable, I have been looking through all my RX7 mags from Japan again and I came across a company that makes Peripheral ports for race, standard, and street. So I am going to contatc them and find out more info on it, as well as maybe try to contact Scoot, becuase I belive they use the same setup.



I have thought of some new ideas for the streetablity of the car, first is to incorportae how the FC secondary throttle plates open at a darstically slower rate, if floor ro mclosed position. Second to make it even more street able place a second set of throttle plate in the LIM or UIM ( or even in the ports themslevs)that can be controled manually (or some how wire up a boost controller to run it) to open the runner from closed to full open. 1/4 will be for street use and full open can be used for track events.



What is the bolt pattern differnce of the FD and FC exhaust ports?



I am always up for a challenge, and I like the impossible. If it doesn't work then no big deal, if it does it will be one kick as ride!





Like I said before I am sick of turbos....

Jeff20B

No other choice? Um... ok.