sc0rp7

iTrader: (3)

If he does the porting himself or has it done by Kahren even, then does some oil mods, etc. it still would not cost 5k to get 200rwhp... even if you include a stand-alone, aftermarket intake manifold/TB's, full custom exhaust, and tuning.

You are right on the fact that you can stand to gain more from a Turbo, i NEVER said dont go turbo, i simply tried to answer his questions. You my friend are fighting a battle that was not brought up, Turbo's can be better than N/A engines, but N/A has its advantages done properly, and will more than likely have life on the Turbo engine...

In Aussie land, when they do get 300+ rwhp, they are bridged engines. Those where the engines I was speaking of.

As for the N/A driveline, i cant deny the fact i would love to have a TII drivetrain, but a N/A tranny can stand up to 250+ hp i believe it was, of course i am sure you could break it with solid mounts and drag slicks or something, but for street applications, i am sure it would be fine.

Bukwild, you seem like an ok guy and i have no wish to bicker with you. However, you are being a pessimist in the power a N/A rotary can make as well as not being at all open minded. Furthermore, the poster didnt ask for turbo information, he asked about porting for a N/A.


- chris

Kahren

iTrader: (13)

all those setup were with diffrent modifications

-first run of collins car was 182 hp, i couldnt go all teh way to redline since the car was running way lean and the power was already dropping because of it.
that was with stock s4 ecu and afm, with t2 lower manifold port matched to 6 port s5 engine and t2 upper manifold. nothing crazy or out of ordinary.
-the second time he came back to the dyno was with an afc installed, even with the settings jacked up on the afc it only added very little fuel and was still leaning out, the stock 460s are onyl good for so much and i am not sure if the stock s4 ecu lets them go up all the way to 100%, no matter what the afc settings are.
since there was nothing else i could do with the afc and the car was still lean i sqeezed the fuel return line with channel locks to, this works as a "ghetto" fuel press regualtor. i just wanted to see how much power could be made. it gave me a good indication that with the porper amount of fuel and a hihgher HP peak because of that which would be at aroudn 7500 rpm, its safe to say the car would make 205 whp hp with no other changes.
here are the links to details on the setup and dyno charts
https://www.rx7club.com/time-slips-dyno-128/na-6port-streetport-dynoed-195whp-update-418805/

-the second car was fritzes, and that was with e6x and a 4 port turbo motor, ported to be turbo, not NA. this was dynoed NA to see the duffrence between 6 port and 4 port, or atlest to have an idea. this motor had 9.0 compression rotors vs collins 9.7 compression rotors. comparing many NA dyno plots i can say that this turbo motor can make 200whp with 9.7 compression rotors and a better exhaust. with more low end then a 6 port would with 6port sleeves removed.
here are the links to details on the setup and dyno charts
https://www.rx7club.com/time-slips-dyno-128/tii-na-streetport-dynoed-186whp-482741/

-both of the cars had the same intake manifold, both cars had an rb header, collins car had an rb catback, fritzes car had some unknown catback that got twice as loud after i finished tuning the car. i am willing to bet there is somethign internally wrong with the mufflers and they are restricting power.

i am building another 4 port motor soon, that will have same port as frtizes car except it iwll have 9.7 compression rotors and will have better ehxuast. we shall see then if it will make over 200whp. this could further be improved with running a better intake manifold or aftermarket itbs suited for NA those who are interested in running the 4 port motor in NA form.



its not consitent because it wasnt the same car or same setup

if you guys have quastions id be happy to answer them.

BigTurbo74

iTrader: (4)

do you have a website or something that lists specs and pricing for your porting?

zerogrips13

yes this is not an argument about turbo vs. n/a.... i know tubro provides a bigger hp for the buck, but every car ive own ive converted to turbo or planned too.. now i pick up my 86 gxl and its n/a.. and ya know what i wanna keep it that way for some weird reason.. i cant explain it but i want to see what kind of power i can make with my own 2 hands, and my budget... im am a noob when it comes to rotorarys, and for the last week ive been trying to absorb all this info, but its too much too soak up in a short time..i am looking to make this car fun to drive..end of story.. i am fimiliar with the different porting types, but not the benefits of them..i gave a horsepower figure because when asking other for opinions is always good to give them a idea of what your looking for so they can advice u better...

im looking to make around 165-180whp...i decided i will be porting it, it will be some sort of street port.. it might be built with s5 rotors..it might not be.. i will have some type of fuel mods.. (afc, injectors, pump..ill find out on the dyno what ill actually need when the time comes). ill be converting to a s4/s5 hybrid intake (port matched and ported), a custom header and exhaust made by me probably (to learn to use the pipe bender at school) .. i see no problem with the n/a drivetrain with my power goals..besides a n/a transmission is easier to come by than a turbo and thats a big thing to me.

this is my rough idea of the buildup of my engine.. i will continue to read up on porting and what not to get a better understanding of what ill need to do to make this engine perform to its maximum pontential when its built..

once more.. thank you to those who actually tried to help me rather than try to point out why i should go turbo or whatever..i ask about a n/a engine because thats what i want to build..

Kahren

iTrader: (13)

the site is down still, but you can pm me...


stock NA manifolds dont work that great with ported motors. it all depends what you are looking for form the car. if you want the best possible low end i would keep the 6 ports functional with the stock manfolds, but this will hinder the upper rpm range greatly. you have to choose what you want, the low end tq could be adressed with other modifications, such as lightweight flywheel, some weight reduction of the car and a higher final drive ratio...

zerogrips13

thanks for the imput on the manifolds.. what is needed to swap to a turbo manifold??

Kahren

iTrader: (13)

if you want to use a turbo intake manifold on a 6 port NA engine, you need to port match it. this is not easy. you first have to fill some some holes on the turbo manifold, and then port it. porting it well and just port matching are very diffrent things. this process is very involved and i wouldnt reccoend doing this, as this is only a bandaid to the problem.

zerogrips13

thanks for the heads up on the manifold swap.. but i came across another question i cant seem to find the answer for..

if i decide to upgrade my flywheel with a light weight one, which one can i use.. all the act one say for turbos only and i cant seem to find any threads on which flywheel to use and what not.. i also read something about using an automatics counter weight..could you please clearify some of these things.. thanks

Richter12x2

iTrader: (1)

Yeah, but that's Australian hp Things just work differently over there.

Josh (owns an Australian Mercury Capri)