Hello there. I'm actually new as a member, but have been reading this forum for a few months now. I recently (three weeks, and four days ago) made the choice to opt for a new car, my all time favourite, the 2nd gen RX-7, prefferably a '91, or '90, turbocharged.



The questions I have about it is



Engines: What model of engine is in the 2nd gens

And is it possible to stick a 13B in there?



Horsepower: Hopefull some tips on what to get, (filter, exhaust,), and some other tips on which ways to get horsepower rather than just these two items.



Reliability: Please, any kind of information, like is the car reliable, any negative opinions, to general kind of car



Fuel mileage: Is there any way to boost the fuel mileage up a little higher?





Thank you so much for your time.

Oh, forgot to mention, I've been studying the apex seals as well for a rotary, and I'd like to make my car perform well, but moderately so.



Huge boost won't be a problem, cause I don't want heavy power, but the seals also come in play, incase I decide to up the psi a bit. Will the Atkins 2mm seals work great, or should I just stick to mazda's seals, and rebuild the engine anyway? I'm just worried about wear down of the seals, and if they break :P Oh, for performance, I think I'll use a boost adjuster (controller) to up the horse power a bit for some added fun.



And for the love of god, can someone explain to me the importance of a larger wastgate?

I'm moving this to the 2nd gen section...you'll get a better response there.

ok. the 2nd gens are a 13b. the turbo models are single turbo, you might have been asking about a tt 13b from a 3rd gen. the series 4 (86-88) was a little diff than the series 5(89-91) the s5 has a little more power, i dont know the exact numbers. there are a lot of things you can do for performance. filter wont really help that much. exhuast for the TII (turbo 2 which is the turbo 2nd gen) the racing beat full exhuast i think is the best for the TII, it increases hp by 30%. bigger turbos will bring more power. the seals i dont know much about bc some people run fine on stock 2mm ones, some people get the upgraded 2mms or go for the 3mms, its just what you think, or find out when you break one but at that point be ready to rebuild a turbo due to the seal flying through it and also rebuild the engine due to the seal trashing the rotor housing. porting will get you some more power, i dont know that much about that though. adkins rotary is very respected so anything you get from them will be pretty much the best you can get. where are you at? do you have emissions laws? the reliability of the car is debatable, some peoples break a lot, some dont. if you are looking for an s5 TII i know where one is with lots of mods that doesnt need much to be at most a 12 second car. theres lots more that i dont know as i am not a TII owner. youll find all the help you need on this site though

2nd gen motor is a 13b

horsepower modifications comes down to what you can afford..note that its typically a domino effect..

although in relation to reliabilty and fuel consumption..it decreases proportionally as your mods or hp increases..

3mm seals are used for insurance...2mm can handle high boost with proper tuning..

ported wategate prevents boost creep as a result of the inability to evacuate the exhaust gasses efficiently

base horsepower for the series four tii is 182

whereas the series five had 200

off topic, what are the numbers for the NAs? at the wheels if possible

Its a good idea to be looking at the 89-91 Model year fc's, in my opinion the 86-88 cars are bags of poop! Just first concentrate of making the car run and look like new before cranking the boost up.



If i ever get a s5 turbo2, the first thing it will get is a haltech, and larger injectors and a nice fuel pump, then i would begin to add more freely flowing exhaust, and performance air intake. I have seen quite a few people pop turbo motors because they added downpipes, exhaust and intake before upgrading the "already stretched to the limit-at-stock fuel system" components. Just be cautious and ask plenty of questions here before adding a go-fast goody https://www.nopistons.com/forums/pub...1047683827.gif .

series four na basehp was 146

versus series five na of 160

numbers went up for the mileage and torque as well

your basis for this comment is what?

Hmm, first, I'm up here in Canada (please don't hate me) and in my province, I can tear the cat out of any car and not get fined for it, so emissions laws are very lienient.



Second, I'm looking for more of some increase in power regarding simple yet stylish bolt ons. The cold air (possibly) ram intake, definately a very high flow exhaust, and the manual boost controller, just raise the psi up a bit more.



Thanks for the help though, I found a really nice grey '90 Fc I like ;> But if I go N/A, is there any good way for simple horsepower?





*show me a piston, and I'll drive you a tragedy*

Oh, UniqueTII, thanks for the help *newbie, newbie*

porting and exhuast for the nas. turbo swap. 20b. its great that you have no emissions laws, thats how it is here. good luck

If you're looking for speed which it sounds like you are, you'd be better off with a TII. The NA's with basic bolt on's hit a roadblock with maybe a 10-20 hp gain (mostly exhaust work) and they still aren't fast. To get them on the level with a basically stock TII, you would need to open it up and port the engine (rebuild) which doesnt make sense $$ wise if you have the option to buy a good running TII. I think both series 4's and 5's have their common probs and unique probs.. most people prefer the S5 because it looks better. I like them both and performance is similar due to the weight diff at least on the NA's.

Well, that's one of the problems, actually. I hear every talking S4 and S5, and I really don't know the difference. I'm aware of the weight differences in each model, sure, but the S4 S5 thing is a little confusing.



Oh, and I'm really not looking for impressive top speed, I'm more concerned with the flow of gasses for now. Maybe adding nitrous down the road would be interesting, but just I just want to see my options for different setups.

series four are 86-88

series five are 89-91...as shane tramell already indicated..

series five have lighter rotors and flywheel and better intake efficency..

turbocharger for the tii model was also improved..control and size of the wastegate

aesthetic differences a well..

Oh, thanks. Must have missed that information. Then I guess I'm going after an S5 (89 - 91 right?)



Don't mean to sound like an idiot, but you can't learn anything if you don't ask questions. Thanks for the help.

The series 4 cars have a very basic, and dumb engine management system also. (that is my reason rob, you **** https://www.nopistons.com/forums/pub...1047683785.gif )

once you mod though, i prefer the mechanical OMP or else I'd be premixing. The only problems that i have with the s4 is that they are a nightmare electrically. I am currently rewiring the entire car from the firewall to the tail lights (engine already rewired). Oh and my s4 looks like an s5

I agree with that apex but the electrical probs seem to be common for all 2nd gens.. they just suck, mostly ground issues. These cars are old too now, even the S5's.

89+ TII very good car!

Okay, I've reworked everything out. It's definately going to be an S5, and the only two mods I really want to do the engine (leaning towards turbo now), is the cat back exhaust, and cool air intake. Now because of this, the PSI will raise about 2-3 psi (right?) so I have my boost increase that I'd like.



Now because of this, I've been reading more and found information about needing more fuel delivery, so a Halboro (forgive me if my spelling sucks) fuel pump, is definately in order, but what about the fuel cut? Do I have to worry about that also?



And I say now, I just, and only just, want these two upgrades for performance. A $500 exhaust system in the US, will cost me about $1400 in Canada :P

get a FCD if you are going to do an exhaust. Also you might want to consider how difficult it is to find a series5 especially in canada. If you come across a clean S4 for the right price, don't exclude it just cuz its an S4.

hey thats cool, we all started somewhere too. at least youre asking before you buy. one diff between the S4 and S5 is the slight change in appearance. the tailights on the S4 are different, i dont know how to explain it but the S5s tailights are round. the body molding on the S4s is not painted(its flat black) compared to the painted ones on the S5. the bumpers are different. spoilers are different. other than that there is some small stuff but nothing really big.

actually an S5, I could buy about four of them right now, just the prices are so expensive ($4000 - $9000) I've found.



An Rx-7 is an Rx-7, and hell, I even find the first gen 7's very cool ;> Sort of a classic Rotary, and everyone I've seen, especially from their age, is well taken care of. The only thing that is alluring to me though, is the engine in the S5. I heard it runs the best because of the ideal weight of the rotors.



Just doing homework before I start investing a lot of money. And next question, if I were to say, remove the resonator (if there is one) and replace it with a straight pipe and replace the muffler, would that be an effective way of gaining a few HP?

Oh and just for the record, and for some bragging rights, I make my own mufflers in my spare time. Straight through, perforated, and stuffed with sound deadening materials.

to increase the hp with exhaust just put a header a downpipe then a straight exhaust.

I guess. My real plan for some extra HP. I have 2 12" subwoofers, two amps, wiring, custom boxes (already made for the 7), and other items I want to stuff in place. So I want to make up for the weight I'm going to add with some extra HP.

But, some questions about the fuel cut defuser,

1) How does it work

2) Can I make my own?

unless youre really good with electronics and crazy stuff like ohms and volt and wiring and all that then you cant....it does stuff with signals and im not about to try and explain/butcher how to make one



it works by sending a different signal to the ECU i believe...or maybe to the solenoid?

I see. If it's just modifying the signal, a delayed signal might be a little better in that respect. So, adding a cat-back exhaust is going to require a bit more research just to use it, but can I get away with adding just the cold air intake?

Actually, is the solenoid pressure activated? Why can't I release some pressure to trick it then?

The s5 also has higher compression to give it a little more power. $4000 is a reasonable price for an s5 in pretty good condition. I bought mine ('89) for $2500 with a blown motor. The best way to gain HP is with a down pipe and mid pipe b/c when you remove the cats the decrease in back pressure gives you more boost. If you're gonna get exhaust go all out and get the Racing Beat full exhaust. Looks nice, sounds even better, gives you nice power increase, and it is some high quality ****. I bought it and never regreted it. Possibly the best mod to my car so far.