2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
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Old 03-13-06, 07:39 PM
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Newbie

Hey im certain this has been discussed here before, but Id like to know what can I do to get maybe a few cheap horses added to my s4 n/a. I got the car and its really clean, not too bad on gas so I take it that its still in great condition. I know nothing about rotary however I would like to see what I can do to it.

Also, what are differences between s4 and s5 engines. Is it like how people compare blue tops and red tops or black top engines amongst toyota and nissan?

Finally, what are the likes of fitting in a FD engine and making it work successfully? Is that too much hassle? I am a fan of the twin turbo so I would like to get my hands on that engine and up in my car. Please let me know. Thanx in advance, I will check in later.

-Tdawg
Old 03-13-06, 08:56 PM
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Welcome Those topics are covered greatly in this forum. The search button is your friend. Tune her up, plugs,wires,fuel filter,air filter. Check out some mods like intake and exhaust at the following:

www.mazdatrix.com
www.Racingbeat.com
www.rx7.com
Old 03-13-06, 11:41 PM
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i read somewhere on here that the FD's REW wont be a direct bolt in like a tii swap. although for a turbo swap you need the tranny, and drivetrain and all that fun stuff. intake, exhaust, and porting are your best friends for quick power from what i've read, along with a good stand alone fuel system. as for the S4 and S5 engines, all i know really is that the S5 engines have more power, but there is a bigger surplus of S4 engines. welcome to the forum man.
Old 03-13-06, 11:45 PM
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Originally Posted by ProjectR13B
i read somewhere on here that the FD's REW wont be a direct bolt in like a tii swap. although for a turbo swap you need the tranny, and drivetrain and all that fun stuff. intake, exhaust, and porting are your best friends for quick power from what i've read, along with a good stand alone fuel system. as for the S4 and S5 engines, all i know really is that the S5 engines have more power, but there is a bigger surplus of S4 engines. welcome to the forum man.
I'm sure you're mistaken. please dont mis-inform new members.

The 13B-RE engines are much easier than the -REW engines. But either way, if you're new to RX7s then I doubt you will do either.

Stick to bolt-ons. Thats the easiest and cheapest way to make decent HP.
Old 03-14-06, 01:27 AM
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sar
Doin a rebuild.

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Putting in an FD REW requires a lot of work, more work that importing a 3 rotor cosmo engine and mounting it, that and honestly a turbo II motor is going to put you in the same power range with half the struggle.

You actually don't have to swap the whole drivetrain if you put in the 13bt. Aaron Cake has proved this with his turbo swap. NA transmissions are known to be able to stand up the torque of approximately 225 rwhp. The TII stuff is a lot thicker, heavier, and stronger.

Intake and exhaust modifications are typical and will net you some horsepower as breathing (esp on a rotary) is important and mazda sort of shortchanged the stock exhaust.

Engine porting requires your engine to be taken apart and you will likely not be able to pass emissions. Depending on the extent of the port and whether you do secondaries, 5/6th ports etc your torque curve will change. A good street port should be able to put you just shy of 200hp. This compares to new cams in a piston engine.

The s4 is series 4 of the RX-7 line, 2nd gen while the s5, series 5. S4 ran 1986-1988 and s5 1989-1991. The s5s have a few more systems inclduing a better ecu with better fuel maps, an electronic oil metering pump, acv controlled 5/6th ports, and vdi (~2psi of boost), lighter rotors, 9.7:1 compression versus 9.4:1. The s5s also have color matched trim, round taillights, etc.

A standaloneis expensive, if you're going to swap in an engine you should consider it. You can get an apexi s-afc (air fuel computer) for about $200 and lean your car out some, but that leads to higher temps (bad),will burn out your catalytic converter, while netting you about 10 crank hp.

Other ways to make your car faster are with upgraded suspension, the ideal and cheap setup is tein s-tech with kyb adjustables. Make sure you use great tires too.

Most, if not all this information is available in the sticky read before you post section, and I actually just posted just like this yesterday. Before asking too many questions or doing too much, i suggest you hang out here, read posts, and end up asking a specific question that hasn't been asked in a while and get used to / enjoy your car while gathering money.

ProjectR13b - if you don't know, and are too lazy to look it up or explain then you're not really helping the forum much - you're just increasing that post count without actually knowing/helping anything. Sorry to be a stifler, but "i read somewhere", and "all i really know" don't really help.

Originally Posted by ProjectR13B
i read somewhere on here that the FD's REW wont be a direct bolt in like a tii swap. although for a turbo swap you need the tranny, and drivetrain and all that fun stuff. intake, exhaust, and porting are your best friends for quick power from what i've read, along with a good stand alone fuel system. as for the S4 and S5 engines, all i know really is that the S5 engines have more power, but there is a bigger surplus of S4 engines. welcome to the forum man.
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