2nd Generation Specific 1986-1992 Discussion

I Need Opinions....

Old 01-15-2004, 09:33 AM
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wuttups guys...i dont really think you guys remember me...i have an 87 gxl which had all sorts of problems...everything from flooding, to car not starting, to no power to coil packs, to doors not opening....



i ended up fixing everything....and the cars running like a dream....reving wonderfull and everything....my baby has 162k miles on it and still kicking hard...thanks to you guys for your help!!



heres my thing though....i'm thinking of getting a rotoray from a junkyard or something so i can start a rebuildin process without touchin my daily driver....i'm planing to replace the seals with some new better ones....planning to get the motor ported...and i'm also planning to turbo the motor with the port....



now i'm planning to get an s4 4 port being that everything will bolt up.....my questions to you guys are..... (keep in mind this will be my 1st rebuild on a rotary)



(can you guys give me your advise on these questions if i was to go turbo and if i wasn't so i can have a better idea)



1. what type of seals should i get??

2. what type of rotors should i run??

3. the manifold i have is for a t-4 housing.....do you guys recommend a smaller turbo?

4. what type of port?? (being that i'm goin turbo)

5. what should i use for fuel??...should i still use the 550's from a t2 or bigger??

6. what should i use for an ecu??
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Old 01-15-2004, 09:46 AM
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are you using a 4 port to turbo or you gonna stick with the 6 port and turbo it? for apex seals in my 6 port i went with the mazda 2 peice apex seals. those are fine or you can get a set of hurley apex seals. I would use the same rotors... I like a little bit higher compression. I put some pretty huge street ports on mine. I would say bridgeport but if your going to turbo it that can get pretty difficult to tune. I got the two stock NA injectors for primaries and I got 550cc turbo II injectors on the secondaries. you might want to change to a little higher flowing fuel pump too such as a walbro or something. a T4 turbo is perfect for that kinda set up. Im running a 60-1 TO4E. and for the ECU.. it depends on how much boost your wanting to run? I have a piggy back (apex a-fc II) and I wouldnt trust it to go over the psi im pushing right now. if 3-5 psi is all you want to run you can go safely with a piggy back. anything over that I suggest a stand a lone such as a haltech or microtech or somethin along those lines. well tell me how much boost your trying to run and what kind of motor your trying to build.. if its for street, drag or what and ill give you some more info.. I seem to be the only one on here liking a turbo 6 port.
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Old 01-15-2004, 10:04 AM
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yea i mean i like the concept of running a 6 port turbo becuase of the fact that i can get the little higher compression and the turbo ya know.....that ws actually one of my debates.....i'm planning to use it as my daily driver so i really wasn't planning to boost huge...i was thinking along the lines of 6-8....maybe 10.....your running an n/a turbo??....see i was thinking i would replace the rotors with some s4 t2 rotors, the seals is what i really haven't looked into to much....i wanted to run the port and turbo but how hard is it to tune??...as far as injectors i was thinking all around 550's and the ecu i heard i can just use a stock t2 ecu from a s4 which i heard clips up to the n/a harness....see my goal is baiscally to get around the 13-14 mark not faster...i knew about the fuel pump, and another problem is that money might be an issue so i might have to play around to get results you know...let me know....



p.s how hard is that actual job....i was looking in the haynes manuel and it didn't seem to be too difficult hoping that the motor is not seized or anything like that....let me know
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Old 01-15-2004, 10:05 AM
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and one more thing....the same questions but what would you recommend if i ddin't go turbo
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Old 01-15-2004, 10:18 AM
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Id use the stock NA rotors if I were you. if you really wanna go out with the apex seals send out the rotors to get milled out for 3mm and use some 3mm apex seals. they take a little more abuse then the 2mm rotors. i would also stick with the stock NA ecu if you could only choose between the stock one and a turbo II ecu. I never really noticed if it just plugged in but its a lil more work then that. Theres sensors on the turbo II that the ECU needs in order for the car to run properly. finding those sensors sometimes can be a bitch and costly. and youll have to do the wiring for them. just use the NA ecu and throw a piggy back on it. but take your time looking into the piggy back fuel computer. I just rushed into getting the apex afc cause i liked the way it looked. now i cant tune my car properly and it really sucks. id go with somethin like a simple digital or something.. its the same price. Ive heard good things about the greddy e-manage but it was for different cars. I dont really know anyone thats used it for a rx-7 yet. you can possibly look into that too. if you do decide to run anything higher then 8 psi get a stand alone.. but if your using it for everyday.. i think youll be very satisfied with 6-8 psi on a To4E and a street ported motor.. its a huge difference. and also.. if your mechanically inclined you can do the work. you may need to take it to get the intercooler pipes done and such unless you know how to weld. and if you didnt go turbo.. id go with a bridgeport.. or if its a daily driver stick with huge street ports. thatll be fine.



https://www.nopistons.com/forums/ind...howtopic=33441



thats the link to my car. check it out and youll see the parts i used and about the price ive spent
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Old 01-15-2004, 10:30 AM
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let me ask you...whats the difference in the compression on the n/a rotors as opposed to t2 rotors....does anyone know?
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Old 01-15-2004, 10:44 AM
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Originally Posted by 13BINFAMOUSREX' date='Jan 15 2004, 08:05 AM
and one more thing....the same questions but what would you recommend if i ddin't go turbo
I guess people are succesfully using the RX-8 rotors, or the S5 N/A rotors are good. You could go with a extend street port or a half bridge. Some stronger stationaries, improve internal oiling passages, you can run a higher rpm safely.



S4 N/A 9.4

S5 N/A 9.7



S4 TII 8.5

S5 TII 9.0



RX-8 10.0 (i think)
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Old 01-15-2004, 10:53 AM
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I have heard of guys puttin S6 rotors in a S5 and S4 block. What would that do. And should this guy do the same?
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Old 01-15-2004, 10:57 AM
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i'm figuring basic law...the higher the compression rotor the lower the boost right??.....i mean i'm not tryin to build a monster race car here....but like i said i would like to be in the 13-14 mark....with or without turbo....right now i'm weighin my options.......although having a turbo and hearing that turbo spools is like harrmony to my ears.....
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Old 01-15-2004, 10:59 AM
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Originally Posted by NCGNETO90' date='Jan 15 2004, 08:53 AM
I have heard of guys puttin S6 rotors in a S5 and S4 block. What would that do. And should this guy do the same?
S6 rotors are nearly identical to the S5 TII rotors.
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