Ok I have a couple of questions to ask. First of all Will a N/a Rotor work in a T2 engine? I'm not to sure but i think That it wont work only if you want High compression for a T2. If i'm right then you don't have to answer it. Second question is can you use a n/a housing on a T2? I'm not sure i want to get a answer from everyone about this one because I heard changing out the exhaust sleeves was the only thing you had to do. Third Question is will a little indention in the rotor or a scaring in the housing cause bad compression. What my situation is I have a s4 N/A and a S5 T2 but the T2 has a little indention in the rear rotor and the rear housing has some scaring. I'm pretty sure my S4 N/A housings are good just because of the fact that it had bad compression but it was the same on both sides the rear and the front. If you can help I would most appreciate it.

 

With regards to your Turbo and NA housings, the spark plug positioning is different, it's a few mm.

 

All of these questions are asked often, and thus answers are easily searchable.

Yes, the rotors will work. But it will raise compression to the NA level ( 9.4 for S4, 9.7 for S5). You will need to be able to tune a high compression turbo engine. Not recommended on the stock ECU.

If you don't have to pass emissions, then yes. You will want to grind out the exhaust diffuser (or swap in the TII exhaust sleeves) and you will need to drill the coolant passage on the rear housing.

If it falls within the compression area, then yes. These marks are common near the exhaust port and spark plug holes.

A little dent on the rotor won't be a problem as long as it is not in the apex seal area.

Edit...But you can't mix S4 and S5 housings as the spark plug location is different for S5.

 

Ok so if i buy a n370 ecu that has a improved fuel curve, a better throttle response, a raised boost level and toggle switch. Then will those Higher compression rotors be good to have.

IF then high compression should i get those carbon apex seals because they are used for higher rpms.

 

What ECU is this?

But broadly speaking, no.

Carbon seals are for NA racing use only.

 

and should only be used on new housings for sealing purposes

 

well are you saying n/a housing or n/a rotors because i tend to put the n/a rotors in then yes they can be used but i'm thinking that you guys are talking about the housings.

 

What?

It's very difficult to understand if you don't type in complete sentences with punctuation. I have no idea what you are trying to ask.

 

this makes my brain hurt.

fwiw, my s4 t2 has s4 na rotors.

 

ummmm Ok this is what i'm talking about. This would work but did you use the carbon apex seals.

 

that is incorrect, same series Aspec engines have the same spark plug timing. for example you can use an S4 n/a rotor housing with a S4 TII rotor housing to build an engine, if you modify the n/a rotor housing to work. S4 to S5 have different spark plug timing though, as well as Aspec to Jspec, S4 Jspec engines have the same spark timing as S5 engines do.

 

Ok so i would need s5 n/a rotors right for the s5 T2 if i want high compression. Now what will last longer the n/a rotors or the t2 rotors.

 

I'm going to have rotary resurrection take my n/a s4 housings and modify them to fit a t2. Then so can i just use my n/a rotors?

 

sigh. ok kid, heres the rundown.

the housings should be t2 housings. sell the na housings and consider a loss. actually it might not be a loss if you plan on paying someone to make na rotor housings work in a turbo engine.

na rotors or t2 rotors have nothing to do with with extension of life. both will work fine with stock apex seals. carbon apex seals are ment for constant high rpm usage, like road racing, or where the car stays above a certain rpm allot.

now, looking back at your original post, are both your engines running?

 

maybe he's thinking of ceramic apex seals. i have no idea why he keeps referring to carbon seals, since it has been reiterated that they are for high RPM non turbo applications and their lifespan is very short as well as a high idle needed.

 

Ok now both did run. The T2 was a J-spec engine ordered from fc3s.org. Aaron replied to someone about a rotor difference either is a s4 that is lighter than a s5 or a n/a is lighter than a t2. So my plan was i have a s4 n/a right and a s5 t2. I have a bad rear housing. i will post pictures of the scaring. So i wanted to use a a N/a s4 housing because i'm pretty sure my n/a housings have no scaring, and also use the n/a rotors. How i would do that is by sending my n/a housings and t2 housings to rotary resurrection and he said he can switch the exhaust sleeves out for a 100 bucks. So I'm thinking about it sending it to him and i can street port my intake and exhaust ports when i get them back. What i wanted was a reliable, street ported, and light weight engine. Then I can use the turbo and stuff like that. I was thinking of ceramic apex seals (but found out that they are carbon apex seals) to hold up to the high rpms because i like racing. A rx7 isn't really made for racing. From when i grew up with my bro working on his rx7 i would like to think it is made for racing. Now this engine i want would be having a stock turbo with ported wastegast and exhaust manifold, sonically clean 550cc injectors, ported throttle body, and all those goodies. If i haven't answered any of your questions please reply again.

 

Its sounding like, keep the turbo rotors and housings together and NA rotors and housings together. Am I correct?

I was curious though, What about using turbo intake side plates on a NA engine buildup? I know the normal NA engine uses 6 ports, WHat about t2 intake side plates and NA high comp rotors and housings? THanks. I was almost going to start another thread, but this seems similar

 

what do you mean by side plates

 

im kinda newb. I mean the cast iron sides taht have the intake ports in them. Im wondering if the t2 intake ports are better than 6 port design for a NA application

 

OH i have no clue. I can tell you that FDs have bigger ones and the 20Bs have bigger ones then the FD.

 

I'm sorry, but I can't follow this. It's just too confusing. Can you post your questions in a list?

 

First question can you use a s4 rotor in a s5 t2 housing?

Second question can you convert a s4 n/a into a s5 t2 housing?

Third question will only a little a couple of scaring places on the housing ruin the compression?

 

Are the 4 port turbo intakes any good fora NA application?

1 yes
2 spark timing for NA and turbo are differnt, Use turbo housings for turbo and NA for NA
3 Many people use old rotor housings. Just dont reuse housings where a apex seal failed. What do you mean by scaring? wear or actual scaring with deep gashes. I would never rebuild an engine with actual gashes. wear marks are ok

 

umm i guess a gashes.

 

Yes, but NA rotors are higher compression and thus you should avoid using the stock ECU. It can also be tricky to tune a high compression turbo rotary.

No. Spark plug holes are in the wrong spot.

Depends on where the scarring is. It's normal to have some scarring around the exhaust ports and spark plug area. If you have scratches near the plug area that you can catch your fingernail in, in my opinion the housing is junk.

Sometimes if you have radical porting like a bridgeport. In general you should stick with an NA intake if you are running the car NA.