iceblue

I am just trying to see what is capable here, for my mx5 swap.

I was out side looking at my 8 and all and got thinking. What can I use from Renesis motor. My plan in head was 13B-RE with REW housings single T78. Now the Renesis has like no overlap unlike its predisesors but this in the side plates not the housings. First are the housings different on a Renesis? Could you use the side plates with REW or RE housings? Obveusly I want low compreshion so REW or RE-S4 rotors? Is there a difference from these rotors and Renesisbesides compreshion?

If im right a Renesis would be the best motor to use but need low compreshion. So using thows 3 motors what can you interchange to make the best large single turbo setup?

SuphaG

iTrader: (10)

The housings on the Renisis are different from the RE and REW housings. The Renisis housings have no exhuast ports compared to the RE and REW housings. Instead, the Renisis has it's exhuast outlets on the side housings. Not to sure about the rotors.

iceblue

Ok so need a compleat Renesis motor to use. Now we need low compreshion rotors.

Tessai

If you're looking to throw low-comp rotors in a renesis, you might as well just get a 13b. Personally, I'd go with a 13b-re. You'll have a much easier time extracting power from the -re, due to more flexability in port designs. From what I've read on here and nopistons, the RX-8 is pretty well maxed out in terms of porting. In other words, potential porting area is much smaller because... well, I can't remember and I'm trying to minimalize my spread of misinformation .

iceblue

I would say that just means less need to port allready done for you.

Syonyk

What kind of power are you looking to make? The Renesis engine is supposedly making 238HP (the MT version). I expect you'd need a standalone to control it, since the ECU would get cranky without it's wheel speed inputs (or so Mazda uses to explain why it only makes 218 or so on the dyno), but... a 240HP NA rotary motor in a Miata would be some serious go-fast power.

Part of the reason the RX-7 motors turbo so well is that all the unburned fuel gets swept out the exhaust port & "afterburns" before going to the turbo - there's a LOT of exhaust energy flying out to spool the turbo. The Renesis doesn't have as much of this, which is why most performance Renesis installs are supercharged - they just don't spin a turbo as well.

I'd say if you're set on a turbo, stay with the RX-7 motors. If you're fine with being high power NA or supercharged, go for the Renesis.

-=Russ=-

RETed

Your MX5 runs a PPF system.
The FD runs a PPF system.
I can't guarantee it'll just drop in with the 13B-REW, but you might be able to take advantage of that fact and retain your PPF...


-Ted

RotaryResurrection

iTrader: (8)

The big thing people are forgetting here is the configuration of the renesis exhaust ports, which will be totally different than any turbo manifold available. Even if you fab one up yourself, you're faced with the fact that those ports aren't going to be as well mated to a turbo as the 2 "straight shot" peripheral exhaust ports on a non renesis rotary.

13b4me

The engine in an RX-8 sits very low in the car compared to the Miata...
The intake plenum wouldn't even clear the hood...

RotaryResurrection

iTrader: (8)

Not without a lot of work. The FD PPF sits on the left/center side of the trans, while the miata apparently sits on the right. Here's a pic of a miata trans and a t2 trans. The FD trans is real similar to the t2 trans, just picture 4 PPF bolts on the center/left side of the tailshft.

13b4me

^^^ Wtf Pistons!!! ^^^

iceblue

Syonyk - you can view in my signiture. But I am looking to make 625bhp. Of cource it will be stand alone.

RETed - Yes they both use the PPF frame but the trany mount is total differ the miata uses a brace from rear end diff to the trany. If you keep this setup you just have to bend a weld a little to fit the rx7 tranny. You still have to fab motor mounts. However the miata does allow for you to install the motor about 4in back if you desire. But does require you to beat in the fire wall a lil bit. The miata uses mounts that bolt in from under the K member to the motor where rx7 fall onto a mount and bolt down. However all of these motors mount isnt a concern b/c well you have to fab motor mounts no matter what. The Rx8 uses like a 6in bar that goes straigh acros from the side iron and bolts directly down to the frame. And this motor does sit down very low and back compred to a 7 a full iron and side iron distance.

Ither way I am just trying to learn the differances and what I can swap and basicly with all these motors how to get the best bang posible

RETed

I'd go 20B.
Seriously, 600+hp on ANY 13B is too much stress on the motor, and it's basically a race-purpose vehicle.


-Ted

iceblue

20B was the outlook for it in the begining but was far to exspencive to perform in that little engin bay. But bullet racing did do a 20b mx5 in australia. So I opted 13b :-)

The miata is basicly a race car. It is the bare you can do and still be street legal atleast to the point you wont get arrested on site. tail lights and head lights lol. The car will be drivin maybe once a week on the weekend.

I will save te 20b project for ither my next project right hand drive GTUs or FD project when I can get one.

sub9lulu

iTrader: (7)

... wtf right hand drive GTUs
whats the point there ... not like they have GTUs in japan ...

iceblue

To have something unique in the states. To drive on the right side of car.

lastphaseofthis

iTrader: (8)

whats the thing all the way to the right in that picture? i have never seen such a thing...

capn

you know if you think that a 20b is too expensive then how is putting in a 13b or renesis in any different? all the engines are a totally different engine then what the car came with. and talking about expenses too, 625 bhp? i mean seriously if that isnt supposed to be expensive then what is? i believe you need to rethink some things before going any further, like money. anything with more then 4 times the normal output that it was made for is going to get expensive.

RotaryResurrection

iTrader: (8)

That's an experimental new engine. They claim it'll take over the world market, given enough R&D time. Instead of turning round and round like normal engines, this one moves up and down. Odd, but they claim it works well enough.

iceblue

Pleas rethink befor posting something like that. I have ben reserching this swap for 3 years. There is more fabrication work that needs to be done to the entire car to fit evrything with a 20b. There is only one in exsistance as well. A fresh 20b will run you right at 5g's and you have a very hard time keeping the PPF fully intact without a tube front end and the whol front cooling system braces will have to be redone to acomidate the length of a 20b

GUITARJUNKIE28

cosmo...

renesis is too much money and not enough power
rew is too much money with basically no advantages over the cosmo
20b is too big

banzaitoyota

I have ridden in a 13bt miata, It was a blast. 280 rwhp iirc

capn

what i posted was my concern with your previous statement about expense. you said it would be more expensive to do a 20b swap then a 13b. BUT either way you want 625 bhp and as i said before almost any motor that is putting a significant amount of power down is going to be some what expensive.

GUITARJUNKIE28

600 hp in a 2000 lb car...

that's just sick and wrong.

iceblue

Thank you for the cancern. Like I said this will be a street race car with a J bridge port. I am just exsploring avenues since well a new motor is available to consider. If I get 50k befor a rebuild I will jump with a smile each day I wake up. I realy think ceramic apex's will help alot on strength and life.